California ADU Permits and Completions by City (2018–2025)

By Kaden Coziar, editor, The Dwelling Index · Updated September 2026

California cities and counties reported permits for 32,363 accessory dwelling units (ADUs) in 2025 and reported 22,699 finished. In 62 of 293 places with at least 50 homes permitted, ADUs were more than half under both counting methods, according to The Dwelling Index's analysis of state housing data (September 2026).

Statewide, ADUs were more than 1 in 4 homes permitted in 2025. Below: California ADU permits by city for every city and county area represented in the state's file, back to 2018, plus city completions for 2024–2025 and statewide completions for 2018–2025 — and why a quick sum of the 2025 file comes out 9,488 ADUs higher than what was permitted in 2025.

An ADU is a small extra home on the same lot as a house or apartment building: a backyard cottage, a converted garage, or a separate unit built into the home (HCD ADU Handbook).

Key California ADU permit statistics

  1. California cities and counties issued permits for 32,363 ADUs in 2025, up 4.1% from 31,081 in 2024 (HCD Annual Progress Report data; The Dwelling Index analysis, Sept. 2026).
  2. ADUs were 26.2% of all homes permitted in California in 2025 — 32,363 of 123,726, or more than 1 in 4 (HCD data; The Dwelling Index analysis, Sept. 2026).
  3. In 62 of the 293 California cities and counties that permitted at least 50 homes in 2025, ADUs were more than half of the permitted units under both counting methods (The Dwelling Index analysis of HCD data, Sept. 2026).
  4. California cities and counties reported 22,699 ADUs finished in 2025, up 9.4% from 20,740 in 2024 — 20.2% of the 112,286 homes finished that year (HCD data; The Dwelling Index analysis, Sept. 2026).
  5. The City of Los Angeles issued permits for 7,451 ADUs in 2025, 23% of California's total; the 10 cities with the most issued 12,948, or 40% (HCD data; The Dwelling Index analysis, Sept. 2026).
  6. ADUs went from 7.8% of homes permitted in California in 2018 (8,912 of 114,664) to 26.2% in 2025, and yearly ADU permits were 3.6 times as high (HCD data; The Dwelling Index analysis, Sept. 2026).
  7. From 2018 through 2025, California cities and counties permitted 172,376 ADUs and reported 102,260 finished (HCD data; The Dwelling Index analysis, Sept. 2026).
  8. California's ADU permits grew 4.1% in 2025, the smallest yearly gain since 2020 (HCD data; The Dwelling Index analysis, Sept. 2026).
  9. From 2022 to 2025, California ADU permits rose 27.0% (25,492 to 32,363) while permits for all other homes fell 21.7% (116,648 to 91,363) (HCD data; The Dwelling Index analysis, Sept. 2026).
  10. In Inglewood, 147 of the 149 homes permitted in 2025 were ADUs (98.7%); in Irvine, 8 of 1,409 were (0.6%) (HCD data; The Dwelling Index analysis, Sept. 2026).
  11. San Francisco issued permits for 171 ADUs in 2025, down 65% from 483 in 2019 (HCD data; The Dwelling Index analysis, Sept. 2026).
  12. Adding up the ADU permit column in the state's 2025 file gives 41,851 — 9,488 more than were permitted in 2025, because some reports also list permits dated in other years or with no issue date (The Dwelling Index analysis of HCD data, Sept. 2026).

On this page: City table · Year by year · Share of new homes · Finished ADUs · Is it slowing? · Counties · Why raw sums run high · How we built this · Download · FAQ

How many ADUs did each California city permit in 2025?

Search all 534 California jurisdictions. A blank value means there were no Table A2 rows for that place and year; it is not zero.

2025 permit count method

534 of 534 jurisdictions

Counts include permits and completions dated in the report year.

California ADU permits and completions by city and unincorporated county area, 2018–2025. Missing values mean no Table A2 rows, not zero.
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1CityLos Angeles7,4517,058+3935,1135,88318,07141.2%
2CitySan Diego2,1652,282-1178482297,94227.3%—
3Unincorporated county areaLos Angeles1,3611,044+3177678113,23542.1%—
4CityLos Angeles644747-1034996491,21852.9%—
5CitySanta Clara502558-563653602,62919.1%—
6CitySanta Barbara479435+4423932793051.5%—
7CityOrange434426+826635963768.1%—
8Unincorporated county areaSan Diego403489-8636940793243.2%—
9CitySacramento378348+302882622,73713.8%—
10CityLos Angeles371229+14225128938696.1%
11CityOrange266277-1122222645258.8%
12CityOrange258193+6515717231681.6%—
13CityVentura244216+2813017424599.6%
14CityLos Angeles241411-170707228484.9%—
15CitySan Bernardino240179+617812387627.4%
16CitySan Bernardino230138+924414340257.2%
17Unincorporated county areaRiverside2279+21846311,95611.6%—
17Unincorporated county areaSanta Barbara227219+8916861337.0%—
19CitySan Diego223246-239920271731.1%—
20CityLos Angeles222208+147312169831.8%—
21CityOrange215232-1718819326082.7%—
22CityLos Angeles209320-11117227046345.1%—
23CityRiverside208309-10121424041550.1%—
23CityMonterey208216-811514022194.1%—
25CityAlameda192213-2125318371227.0%—
26CityAlameda188133+5510214256033.6%—
27City and countySan Francisco171231-603362181,9598.7%—
28CityOrange168110+58654061627.3%
29CitySan Bernardino154163-9981281,9308.0%—
29CityLos Angeles15462+9217716315897.5%
31CityLos Angeles14718+12902214998.7%
32CityLos Angeles146202-5615914120272.3%
33CityLos Angeles143130+13137645031.8%—
34CitySanta Barbara141110+3111310025555.3%—
35CitySanta Clara14062+78637053126.4%—
36Unincorporated county areaKern13975+64407649328.2%—
37CitySanta Clara136128+810513817478.2%—
37CityLos Angeles13694+42809017876.4%—
37CityVentura13678+58549043131.6%—
40CityRiverside12992+37207116379.1%
41Unincorporated county areaContra Costa124108+16788228643.4%
42CityVentura12293+299310321357.3%—
43CityLos Angeles119102+17349013786.9%—
43CityLos Angeles11981+3803112396.7%—
43CitySanta Clara11974+450021455.6%
46CityAlameda117102+15919246325.3%—
46CitySan Diego117109+8697051422.8%—
48Unincorporated county areaSonoma110136-269410230536.1%—
49CityStanislaus109112-37911344724.4%
50CitySanta Clara10773+34747221649.5%—
51CityLos Angeles10686+20237121848.6%—
52Unincorporated county areaStanislaus10374+29386018854.8%—
53CityLos Angeles102115-131577413774.5%—
54CityFresno10187+1416412,0145.0%—
54Unincorporated county areaOrange10162+39725639325.7%—
56CitySan Diego100131-316110018952.9%—
57CityLos Angeles99116-177811212281.1%
58CityLos Angeles9879+19467615563.2%—
58Unincorporated county areaVentura9874+24635615264.5%—
60CityVentura9774+23125734028.5%—
61CityLos Angeles9678+18463013670.6%—
62Unincorporated county areaAlameda94121-27377410787.9%
62CitySan Mateo9466+28416829132.3%
64Unincorporated county areaEl Dorado9273+19656149318.7%—
64Unincorporated county areaPlacer92143-511277555216.7%—
66Unincorporated county areaSan Bernardino91116-2506244020.7%—
66CitySan Luis Obispo9167+24547319846.0%—
68CityRiverside9086+4593737024.3%—
69CityOrange8992-3667323238.4%—
69CitySanta Clara8962+27647124736.0%—
69Unincorporated county areaSan Luis Obispo8995-6746520443.6%—
69CityLos Angeles89123-341079710882.4%
73CityOrange88104-16746417151.5%—
74CityOrange87132-450014460.4%
75CitySan Diego8675+11576321041.0%—
75CitySanta Clara8657+29495038822.2%—
75Unincorporated county areaSacramento86185-9972411,1767.3%—
75CityLos Angeles8697-1189659194.5%—
79CitySan Diego85131-46969118745.5%—
79Unincorporated county areaMarin8548+37324412269.7%
81CityRiverside8453+31351422437.5%—
82CityLos Angeles8380+378718993.3%—
83CityAlameda8112+6972557514.1%—
83CitySan Diego81113-32736825431.9%—
83CitySan Diego81115-34105768929.1%—
83CitySan Bernardino8170+11626761113.3%—
87CityRiverside80800151335822.3%—
88Unincorporated county areaSanta Clara7956+23536212165.3%—
88CitySanta Cruz79106-27878342418.6%—
90CitySan Diego7757+20677734322.4%—
91CityLos Angeles7665+11325310473.1%—
92CityLos Angeles7440+3434278587.1%
93CityNapa7359+1405916444.5%—
94CityImperial7171022479773.2%
94CityContra Costa7155+16473514848.0%
96CityLos Angeles69176-1071307110466.3%
97CityLos Angeles6858+10434618536.8%—
98CityRiverside6614+5233729522.4%—
98CityOrange6697-3162508181.5%—
100CityKern6586-2132642,1253.1%—
100CityOrange6595-30695933919.2%—
100CitySan Bernardino6560+548538873.9%—
103CityContra Costa6477-13445125325.3%—
104CitySan Mateo6357+6393310261.8%
104CitySan Mateo6349+1404348912.9%—
104CitySan Joaquin6352+1110107168.8%—
107CityLos Angeles6164-3571041114.8%
107Unincorporated county areaMonterey6154+7385426922.7%—
109CitySanta Clara5944+15484811153.2%—
109CitySan Bernardino5924+35173735416.7%—
111CityOrange5829+29589358100.0%
111CityRiverside5814+441407068.2%—
111CityAlameda5831+27456142213.7%
111CityLos Angeles5868-1058566096.7%—
115CityLos Angeles5746+11709361.3%—
115CitySanta Barbara5744+1316012047.5%
115CityOrange5754+3285712944.2%—
115CityAlameda5737+2002431618.0%
119CityAlameda5654+244417574.7%—
119CitySan Mateo5650+648415896.6%
119CitySan Diego5624+321687178.9%—
122CitySanta Clara5327+2631407273.6%
122CityLos Angeles5357-414256285.5%
124CityAlameda5258-641406580.0%—
124CitySanta Clara5270-1844589355.9%
124CityLos Angeles5265-1319635496.3%—
127CityImperial5145+631388361.4%
127CityLos Angeles5172-214086875.0%—
127Unincorporated county areaSan Joaquin5130+210246011.1%—
130CityLos Angeles5061-1153375198.0%—
130CityAlameda5045+540435296.2%—
132CityContra Costa4945+4433417528.0%—
132CitySanta Clara4944+5265023920.5%—
132CitySan Diego4932+1722395196.1%—
132Unincorporated county areaSan Mateo4960-11451315831.0%—
136CitySan Mateo4851-349291,3353.6%—
137CitySonoma4790-4321318615.5%—
137CitySolano4792-4529844610.5%—
139CitySan Bernardino4627+1982111739.3%—
140CitySan Mateo4536+92536075.0%—
141Unincorporated county areaSanta Cruz43102-5976675578.2%—
142CitySan Mateo4243-149506663.6%—
142CityYolo4239+326277357.5%
142Unincorporated county areaFresno424+3812418323.0%—
142CityContra Costa4225+1723275084.0%
142CitySan Bernardino4257-15164811436.8%—
142CityAlameda4234+843015327.5%
148CityLos Angeles4122+1937154591.1%—
149CitySan Bernardino4052-12353326515.1%
149CityTulare4038+230277025.7%—
151CityLos Angeles3921+1822115078.0%
151CityPlacer3920+1918371,4342.7%—
151CitySan Bernardino3938+1292811035.5%
154CityMonterey3823+151905174.5%—
154CityRiverside3845-702220218.8%
154CitySan Mateo3825+1314363929.7%—
154CityLos Angeles3852-1444214290.5%
158CityOrange3736+123334778.7%—
159CitySan Diego3633+316298840.9%—
159CitySan Mateo3626+1024278243.9%—
159CityNevada3637-1355013826.1%—
159CityLos Angeles3640-4242836100.0%
159CityLos Angeles3629+7273825414.2%—
164CitySacramento3532+3361918019.4%—
164CityFresno3544-938315975.9%
164CityLos Angeles3513+220035100.0%
164CityOrange3519+1613173697.2%—
164CityOrange3517+1821276553.8%—
169CityVentura3439-5122017619.3%—
169CityLos Angeles3452-18243515521.9%—
169CityContra Costa340+34373012627.0%—
169CityAlameda3429+5141413924.5%—
169CityMonterey348+2624216056.7%—
169CityOrange3422+1218273791.9%—
175CityButte3346-13453224413.5%—
175CityRiverside3331+27163948.4%
177CitySanta Barbara3257-2531303648.8%—
178CityLos Angeles3149-183026845.6%—
178CitySan Mateo3126+5313719116.2%—
178CitySanta Clara319+22053299.4%—
178CitySonoma3119+12213323013.5%—
178CityTulare3124+715124686.6%—
183CityLos Angeles3033-346263878.9%—
183CitySanta Clara3035-522263781.1%—
183CityLos Angeles3031-127224468.2%—
183CitySan Diego3044-1434327733.9%—
183CitySan Diego3020+1015143781.1%—
188CitySan Mateo2925+417246643.9%—
188CitySanta Clara2940-1149203778.4%—
188CitySan Diego2944-1527393290.6%—
188CitySolano2930-1233319315.0%—
192CityLos Angeles2830-241328100.0%—
192CityOrange2814+1410178931.5%—
192CityContra Costa2813+1519133384.8%
192CityMarin2834-65303384.8%—
196CitySan Bernardino273+24543298.2%—
196CityTulare2728-123719014.2%—
196CityLos Angeles2718+9447518214.8%—
196CitySan Joaquin2768-4150838731.0%—
196CityContra Costa2741-14193714618.5%—
201CityLos Angeles2634-8281226100.0%—
201CitySan Mateo267+196626100.0%—
201CityVentura2615+117112796.3%—
201CitySan Luis Obispo2620+6211916815.5%—
201CityShasta26260232720112.9%—
201CityLos Angeles2614+1223113086.7%
201CityLos Angeles2649-2334172796.3%—
208CityLos Angeles250+251502889.3%
208CityImperial254+21096637.9%—
208CityOrange2511+14886836.8%—
208CityRiverside2517+8111024810.1%—
208CityLos Angeles2523+2493669.4%—
208CityOrange2547-221975248.1%
208CityRiverside2521+48177573.3%—
208CityLos Angeles2533-83228529.4%—
208Unincorporated county areaShasta2537-1239257732.5%—
208CityMarin2513+121132986.2%
218CityLos Angeles249+1541216414.6%
218CityRiverside248+16153157.6%—
218CityMerced2416+85102708.9%—
218CityLos Angeles2439-15252810223.5%—
218CitySan Joaquin24No Table A2 rowsNo Table A2 rowsNo Table A2 rows276004.0%
218CitySan Diego2425-16224553.3%—
224CitySan Bernardino2319+49145343.4%—
224CityLos Angeles2333-10192823100.0%—
224CitySacramento2352-2932364864.7%—
224CitySan Bernardino2313+1010225284.4%—
224CityMonterey2331-813227729.9%
224CityVentura2317+628202688.5%—
224CityRiverside237+161904844.8%—
231CityStanislaus227+15792588.0%
231CityLos Angeles2256-3426205143.1%—
231CitySan Mateo2229-7331722100.0%
231CityImperial2210+124115639.3%
231CityLos Angeles2217+5223268.8%
231CityLos Angeles2232-1014202588.0%—
231CityFresno227+15003171.0%—
231CitySan Luis Obispo2215+718143171.0%—
231Unincorporated county areaNapa2214+825185837.9%—
231CityContra Costa2233-11867828.2%—
231CityLos Angeles228+142514515.2%—
242CitySan Bernardino2123-217814015.0%—
242CityHumboldt2126-5172014314.7%
242CitySan Joaquin2114+732817811.8%—
242CityYolo2123-262110120.8%
242CitySan Mateo2127-624203265.6%—
247CityContra Costa2021-1162312316.3%
247CityOrange202+187154050.0%—
247Unincorporated county areaNevada2015+525217626.3%—
247CityLos Angeles203+17722676.9%—
251CityAlameda1912+79252288.3%—
251CitySan Luis Obispo1915+41165633.9%
251Unincorporated county areaMadera190+1911219901.9%—
254CityLos Angeles1829-1152722378.3%
254Unincorporated county areaButte1815+311202856.3%—
254CityMonterey181+174818100.0%
254CitySan Benito1819-1211316610.8%—
254CityContra Costa180+181922766.7%—
254CityMonterey1815+33212090.0%
254CitySan Mateo1816+24072090.0%—
254CityPlacer1815+32063035.9%—
254CityMarin1815+311121994.7%—
263CityLos Angeles176+111352965.7%
263CityContra Costa1718-115131989.5%
263CityContra Costa1730-1310162373.9%—
263Unincorporated county areaSolano1714+311104835.4%—
263CityOrange1715+24155431.5%
263CitySan Bernardino1722-5111716210.5%
263CitySan Bernardino174+13345034.0%
270CityMarin164+12162272.7%
270CityLos Angeles1613+310142661.5%—
272CitySan Luis Obispo1526-1113111693.8%—
272CityLos Angeles1511+4659915.2%—
272CityMonterey1519-48132365.2%—
272CitySanta Barbara1517-219112075.0%—
272CityRiverside158+7014523.3%—
272CityOrange155+105715100.0%
272Unincorporated county areaMendocino1525-1025227320.5%
272CityOrange1517-29151549.7%
272CityRiverside1512+3562995.0%—
272CityLos Angeles1519-45111693.8%—
282CitySan Luis Obispo1425-1114158815.9%—
282CitySan Diego1420-6201714100.0%—
282CityContra Costa1426-1223268616.3%—
282CityMarin142+12751593.3%—
282CityMonterey1414018115028.0%—
282CityOrange1410+41061593.3%—
282CityRiverside1415-124101,4291.0%
282CityMarin1425-1112181593.3%
282CityAlameda141409141593.3%
282CityOrange1412+25162263.6%—
282CityLos Angeles1428-142803046.7%
282CityRiverside1413+15131927.3%—
282CitySonoma1412+21071469.6%—
295CityOrange134+9444231.0%—
295CitySan Joaquin131+12008211.6%—
295CityMonterey136+71372365.5%—
295CityVentura1316-371613100.0%
295CitySacramento1312+11157671.7%—
295Unincorporated county areaSan Benito1329-16182010612.3%
295Unincorporated county areaTehama13No Table A2 rowsNo Table A2 rowsNo Table A2 rows44628.3%
295CityStanislaus135+8014727.7%—
295CityYolo1312+1001966.6%—
304CityLos Angeles125+77111485.7%
304CitySolano1215-312152474.9%—
304CityPlacer124+8295012.4%—
304CitySanta Clara1213-1991675.0%—
304CityFresno120+12082254.5%—
304CityNapa121204152548.0%—
304CityRiverside122+10031936.2%—
311CitySacramento110+1128191,5690.7%—
311CitySan Mateo1112-115122544.0%—
311CityLos Angeles115+63111573.3%
311CityLos Angeles117+4772250.0%—
311CityRiverside1116-571510710.3%—
311CitySan Mateo1111010811100.0%—
311CitySonoma110+11276217.7%—
311CityMonterey1113-2243211100.0%
311Unincorporated county areaTulare116+50281477.5%—
320CityHumboldt1019-918145318.9%—
320CityMarin1020-10101210100.0%—
320CityMarin1027-1724201376.9%—
320CityContra Costa104+63410100.0%—
320CityContra Costa109+1574223.8%—
320CityEl Dorado1011-1559810.2%—
320Unincorporated county areaYuba1017-71434412.3%—
327CitySan Diego95+41392437.5%—
327Unincorporated county areaDel Norte910-110147212.5%
327Unincorporated county areaImperial913-4021217.4%
327Unincorporated county areaMariposa95+4605516.4%—
327CityRiverside97+220274918.4%
327CityContra Costa913-462929.8%—
327Unincorporated county areaPlumas96+3105416.7%—
327CitySanta Cruz96+3241535.9%—
327CitySanta Cruz917-816172045.0%
336Unincorporated county areaAmador82+6284418.2%—
336CityNapa880752630.8%—
336CityTulare84+4141166.9%—
336CityVentura811-3044020.0%
336CitySanta Barbara834-26748100.0%—
336CityRiverside813-51206412.5%
336Unincorporated county areaInyo87+1021457.1%
336CityOrange80+80281,4090.6%—
336CityMono83+5342532.0%—
336CityStanislaus84+4142236.4%—
336CityFresno810-2182236.4%—
336CitySan Joaquin86+244998.1%—
336CitySonoma89-14124020.0%—
336CityKern85+3394541.8%—
336CityLos Angeles89-1428100.0%—
351CityPlacer72+5442231.8%
351CitySolano717-101337100.0%—
351CitySan Mateo76+106977.8%—
351CityKings711-4453911.8%—
351CitySonoma7702101146.1%
351CityMerced70+711907.8%—
351CityLos Angeles727-202514887.5%—
351CityOrange79-2712977.8%
351CityEl Dorado713-61051166.0%
351CityTehama70+7244615.2%—
351CityMarin716-98137100.0%
351CityMarin714-7127887.5%—
363CityNapa660581563.8%—
363CityKern613-7006100.0%—
363CityRiverside63+3716100.0%—
363CitySanta Cruz610-4791250.0%
363CityMarin613-7165785.7%—
363CitySacramento65+1042952.0%—
363Unincorporated county areaHumboldt631-252432748.1%—
363CityFresno63+3034912.2%—
363Unincorporated county areaLake68-222639.5%
363CityTulare69-365785.7%—
363CityPlacer67-1341637.5%—
363CityKern67-1355411.1%
375CitySan Bernardino52+329683.3%—
375Unincorporated county areaCalaveras56-146657.7%
375CityMadera56-1011214.1%
375CityMonterey53+2145100.0%
375CityKern515-10091084.6%—
375CityAlameda54+1225683.3%
375CityRiverside58-3511338.5%—
375CityLos Angeles59-4474910.2%—
375Unincorporated county areaMerced52+322519.8%—
375Unincorporated county areaMono550123215.6%—
375CityStanislaus58-324862.5%—
375CityLos Angeles57-2655100.0%—
375Unincorporated county areaSiskiyou52+3024511.1%
375CitySanta Barbara51+4115100.0%
375CitySolano550551034.9%—
375CityMendocino51+411683.3%—
375CitySutter57-2323481.4%—
392CityRiverside43+1512676.0%—
392CitySanta Barbara41+321850.0%—
392CityMerced41+3004100.0%
392CityOrange45-1124100.0%
392CityButte40+4445110.8%—
392CityStanislaus4No Table A2 rowsNo Table A2 rowsNo Table A2 rows01762.3%
392CityOrange41+3104100.0%—
392CityOrange42+225666.7%
392CitySonoma411-758850.0%—
392CityKern41+3311233.3%
392Unincorporated county areaTuolumne40+480874.6%—
392Unincorporated county areaYolo41+3542218.2%—
404CitySan Bernardino36-311407.5%
404CitySonoma34-1123100.0%—
404CityKings30+300614.9%
404CitySolano36-3212351.3%
404CitySan Joaquin30+301475.0%—
404CityHumboldt33023475.0%—
404CityMendocino36-332933.3%
404CitySan Bernardino34-1003100.0%—
404CityNevada35-223496.1%—
404CityContra Costa32+104475.0%—
404CityMerced34-1605050.6%—
404CityButte30+310674.5%—
404CityRiverside37-4023011.0%—
404CitySan Benito30+3133100.0%
404CityContra Costa311-881763.9%—
404CityShasta32+100837.5%—
404CityLassen30+3021127.3%
404CityMendocino38-513560.0%—
422CityOrange21+1012100.0%
422CityKings20+200450.0%
422CitySan Bernardino20+200540.0%
422CityInyo23-150366.7%
422CityFresno21+1201002.0%—
422CityLos Angeles20+244922.2%—
422Unincorporated county areaKings220911612.5%—
422CityKern2No Table A2 rowsNo Table A2 rowsNo Table A2 rows1366.7%
422Unincorporated county areaModoc20+2001118.2%—
422CityFresno20+200326.2%
422CitySan Luis Obispo24-232922.2%—
422Unincorporated county areaSutter212-10461216.7%—
422CityOrange220302100.0%
422CityKern26-4232100.0%—
422CityYolo220552100.0%—
422CityNapa26-402366.7%—
438CityShasta10+101812.5%—
438CityMerced10+1101010.0%—
438CityLos Angeles10+112616.7%
438CityKern10+1001300.8%
438CitySan Mateo1No Table A2 rowsNo Table A2 rowsNo Table A2 rows01100.0%
438CityColusa1No Table A2 rowsNo Table A2 rowsNo Table A2 rows0551.8%
438Unincorporated county areaColusa13-210520.0%—
438CitySonoma14-372333.3%—
438CityTulare12-100273.7%—
438CityTulare110001100.0%
438CityHumboldt18-733185.6%—
438CityImperial15-400250.0%
438CityFresno11000185.6%
438CityLos Angeles11021425.0%—
438Unincorporated county areaLassen10+111616.7%
438CityYuba10+100333.3%
438CityKern10+170731.4%
438CityNevada14-350714.3%—
438CityFresno10+100333.3%
438CityPlumas1No Table A2 rowsNo Table A2 rowsNo Table A2 rows01100.0%
438CityLos Angeles12-1001100.0%
438CityTuolumne13-2001100.0%
438CityAmador11010425.0%—
438CitySan Bernardino14-301616.7%—
438CityColusa10+1031100.0%—
463Unincorporated county areaAlpine0001240.0%
463CityAmador01-10110.0%
463CityCalaveras0000020.0%—
463CityButte0No Table A2 rowsNo Table A2 rowsNo Table A2 rows00No Table A2 rows
463CityHumboldt02-2000No Table A2 rows
463CityRiverside000000No Table A2 rows—
463CityLos Angeles0001030.0%
463CityImperial0No Table A2 rowsNo Table A2 rowsNo Table A2 rows040.0%
463CityLake02-2100No Table A2 rows—
463CityFresno0000110.0%—
463CityLos Angeles0No Table A2 rowsNo Table A2 rowsNo Table A2 rows00No Table A2 rows
463CityFresno00000120.0%—
463CityButte0No Table A2 rowsNo Table A2 rowsNo Table A2 rows0360.0%
463CityFresno0000010.0%
463CityAmador0000090.0%—
463CitySacramento0No Table A2 rowsNo Table A2 rowsNo Table A2 rows030.0%
463CityAmador0000040.0%—
463CityLake00010660.0%—
463CityKings06-63140.0%—
463CitySutter0000020.0%—
463CityLos Angeles015-15000No Table A2 rows
463CitySan Mateo014-14109970.0%—
463CitySiskiyou0001010.0%
463CitySan Bernardino0000010.0%—
463CityGlenn0No Table A2 rowsNo Table A2 rowsNo Table A2 rows20No Table A2 rows
463CityMendocino0No Table A2 rowsNo Table A2 rowsNo Table A2 rows00No Table A2 rows
463CitySan Bernardino065-6565980No Table A2 rows
463CityHumboldt0No Table A2 rowsNo Table A2 rowsNo Table A2 rows010.0%
463CitySolano00000490.0%—
463CityStanislaus08-823880.0%—
463Unincorporated county areaSierra03-310110.0%—
463CityKern0002040.0%—
463CityHumboldt0000020.0%
463Unincorporated county areaTrinity0No Table A2 rowsNo Table A2 rowsNo Table A2 rows340.0%
463CitySiskiyou0No Table A2 rowsNo Table A2 rowsNo Table A2 rows00No Table A2 rows
463CitySiskiyou0000040.0%
463CityLos Angeles01-1020No Table A2 rows
463CityYuba01-100120.0%
463CityGlenn0000010.0%
463CityTulare000010No Table A2 rows—
463CitySiskiyou01-1100No Table A2 rows
—CityModocNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CitySan BernardinoNo Table A2 rows20No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rows54No Table A2 rows40No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityRiversideNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityRiversideNo Table A2 rows1No Table A2 rows1No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityContra CostaNo Table A2 rows5No Table A2 rows3No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityPlacerNo Table A2 rows1No Table A2 rows1No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityTehamaNo Table A2 rows0No Table A2 rows2No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityDel NorteNo Table A2 rows27No Table A2 rows1No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CitySiskiyouNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityMercedNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CitySiskiyouNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CitySiskiyouNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CitySiskiyouNo Table A2 rows0No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—Unincorporated county areaGlennNo Table A2 rows1No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityStanislausNo Table A2 rows0No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rows1No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rows104No Table A2 rows17No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityMaderaNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CitySiskiyouNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityAmadorNo Table A2 rows0No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityFresnoNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityMontereyNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityFresnoNo Table A2 rows1No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityVenturaNo Table A2 rows0No Table A2 rows0No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityStanislausNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityLos AngelesNo Table A2 rows95No Table A2 rows76No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—CityImperialNo Table A2 rows3No Table A2 rows2No Table A2 rowsNo Table A2 rowsNo Table A2 rows
—California total—All counties32,36331,081+1,28220,74022,699123,72626.2%32,363 permitted in 2025Totals stay fixed when filters change.

Date-matched permits, completions and trends count values whose stage date matches the report year. The as-filed method includes any issue year or undated unit listed in the 2025 report. Completion counts are not divided by permit counts. No visitor search or filter choice is stored.

The City of Los Angeles issued permits for 7,451 ADUs in 2025, the most in California. San Diego was second with 2,165, and the unincorporated part of Los Angeles County was third with 1,361. The 10 cities with the most ADU permits issued 12,948 of the state's 32,363, or 40%.

Los Angeles is in a class by itself. Its 7,451 ADU permits are more than the next five cities put together: San Diego, Long Beach, San José, Santa Maria and Garden Grove add up to 4,224.

Search for any city or county below. "Unincorporated" means the parts of a county outside any city's limits. The county issues permits there, so a county row never includes its cities.

Top 25 California cities and county areas by ADU permits, 2025

How many ADUs did each California city permit in 2025?
RankCity or county areaCountyADU permits 2025ADU permits 2024ADUs completed 2025All homes permitted 2025ADU share of homes permitted
1Los AngelesLos Angeles7,4517,0585,88318,07141.2%
2San DiegoSan Diego2,1652,2822297,94227.3%
3Los Angeles County (unincorporated)Los Angeles1,3611,0448113,23542.1%
4Long BeachLos Angeles6447476491,21852.9%
5San JoséSanta Clara5025583602,62919.1%
6Santa MariaSanta Barbara47943532793051.5%
7Garden GroveOrange43442635963768.1%
8San Diego County (unincorporated)San Diego40348940793243.2%
9SacramentoSacramento3783482622,73713.8%
10GlendaleLos Angeles37122928938696.1% (44.2% as filed)
11AnaheimOrange26627722645258.8% (31.3% as filed)
12Santa AnaOrange25819317231681.6%
13OxnardVentura24421617424599.6% (34.5% as filed)
14BurbankLos Angeles2414117228484.9%
15FontanaSan Bernardino24017912387627.4%
16San BernardinoSan Bernardino23013814340257.2%
17Riverside County (unincorporated)Riverside2279311,95611.6%
17Santa Barbara County (unincorporated)Santa Barbara22721916861337.0%
19Chula VistaSan Diego22324620271731.1%
20PasadenaLos Angeles22220812169831.8%
21WestminsterOrange21523219326082.7%
22LancasterLos Angeles20932027046345.1%
23RiversideRiverside20830924041550.1%
23SalinasMonterey20821614022194.1%
25OaklandAlameda19221318371227.0%
Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, file updated Sept. 25, 2026, checked Sept. 29, 2026. Counts include only permits or completions whose stage date matches the report year.

Three cities in the top 25 get two shares. Glendale, Anaheim and Oxnard also listed permits dated in other years in their 2025 reports. Count everything they filed, and ADUs fall to 44.2%, 31.3% and 34.5% of all permitted units listed in their 2025 reports. The full table has both numbers for every place.

San Diego reported 229 finished ADUs in 2025 against 2,165 permits. The state file doesn't say why its finished count is so low, so read it as reported. If you're building there, here's how San Diego's ADU permit process works.

Ten cities issued 40% of California's ADU permits in 2025

Los Angeles alone issued 7,451 of the state's 32,363 (23%). The ten cities together: 12,948.

Ten cities issued 40% of California's ADU permits in 2025Bar chart: ten California cities issued 12,948 of the state's 32,363 ADU permits in 2025, or 40%. Los Angeles led with 7,451, followed by San Diego with 2,165 and Long Beach with 644.02k4k6k8kLos Angeles7,451San Diego2,165Long Beach644San José502Santa Maria479Garden Grove434Sacramento378Glendale371Anaheim266Santa Ana258ADU housing units permitted in 2025Source: The Dwelling Index analysis of California HCD Annual Progress Report data (Table A2), file updated Sept. 25, 2026,checked Sept. 29, 2026. Dates matched to report years. dwellingindex.com/research/california-adu-permits/ Cities only; unincorporated county areas not ranked here.

Bar chart: ten California cities issued 12,948 of the state's 32,363 ADU permits in 2025, or 40%. Los Angeles led with 7,451, followed by San Diego with 2,165 and Long Beach with 644. Source: California HCD APR data, Table A2.

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How many ADUs did California permit and finish each year?

California issued permits for 32,363 ADUs in 2025, up from 8,912 in 2018 — 3.6 times as many. Cities and counties reported 22,699 ADUs finished in 2025, up from 3,171 in 2018. Over the same years, ADUs went from 7.8% of all homes permitted to 26.2%.

California ADU permits and completions by year, 2018–2025

How many ADUs did California permit and finish each year?
YearADU permitsChange from prior yearAll homes permittedADU share of homes permittedADUs completedADU share of homes completed
20188,912—114,6647.8%3,1714.5%
201912,706+42.6%121,59710.4%5,8957.8%
202012,775+0.5%112,42511.4%7,9759.4%
202120,623+61.4%134,96315.3%10,04110.2%
202225,492+23.6%142,14017.9%14,01513.8%
202328,424+11.5%134,84721.1%17,72417.6%
202431,081+9.3%119,18926.1%20,74018.1%
202532,363+4.1%123,72626.2%22,69920.2%
Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, file updated Sept. 25, 2026, checked Sept. 29, 2026. Each year counts permits and completions dated in that same report year.

Here's the change in one picture. In 2018, about 1 in every 13 homes that got a permit in California was an ADU. By 2025 it was more than 1 in 4.

ADUs went from 1 in 13 to more than 1 in 4 California homes permitted

ADU permits and ADU share of all homes permitted, 2018–2025

ADUs went from 1 in 13 to more than 1 in 4 California homes permittedBar and line chart: California ADU permits rose from 8,912 in 2018 to 32,363 in 2025, and ADUs grew from 7.8% to 26.2% of all homes permitted.ADU housing units permittedShare of all homes permitted010k20k30k40k0%10%20%30%35%8,912201812,706201912,775202020,623202125,492202228,424202331,081202432,36320257.8%10.4%11.4%15.3%17.9%21.1%26.1%26.2%ADU permitsADU shareSource: The Dwelling Index analysis of California HCD Annual Progress Report data (Table A2), file updated Sept. 25, 2026,checked Sept. 29, 2026. Dates matched to report years. dwellingindex.com/research/california-adu-permits/

Bar and line chart: California ADU permits rose from 8,912 in 2018 to 32,363 in 2025, and ADUs grew from 7.8% to 26.2% of all homes permitted. Source: California HCD APR data, Table A2.

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What counts as an ADU permit here?

One ADU permit in these numbers means one housing unit that got a building permit, counted only when the permit date falls in that same report year. One permit document can cover more than one unit, so these are counts of homes, not paperwork.

The state's form counts a unit as an ADU if it is attached to a house, detached, or built inside the living area, and has its own place to live, sleep, eat, cook and use the bathroom. That includes small efficiency units and manufactured homes used as ADUs (HCD reporting instructions).

What counts as a finished ADU?

A finished ADU is one where the city or county issued a certificate of occupancy, or other proof it's ready to live in, such as a final inspection or a notice of completion, during that year (HCD reporting instructions). Think of the permit as the "go" sign and the finish as the "move in" sign.

What share of California homes permitted and finished are ADUs?

ADUs were 26.2% of the 123,726 homes permitted in California in 2025 (32,363 units) and 20.2% of the 112,286 homes finished (22,699 units). In 62 of the 293 cities and counties that permitted at least 50 homes, ADUs were more than half of permitted units under both counting methods.

Picture 100 homes that got permits in California last year. About 26 of them were ADUs.

Where were ADUs most of the homes permitted?

These are the 62 places. Each one permitted at least 50 homes in 2025, and ADUs were more than half of them whether you match permit dates to the 2025 report year or count everything the place listed in that report. Places that pass only one of those tests are left off.

In Inglewood, 147 of 149 homes permitted in 2025 were ADUs. In Hillsborough, 56 of 58.

California cities and county areas where ADUs were more than half of new homes permitted, 2025

Where were ADUs most of the homes permitted?
City or county areaCountyADU permits 2025All homes permitted 2025ADU share (date matched)ADU share (as filed)
Buena ParkOrange5858100.0%58.1%
InglewoodLos Angeles14714998.7%98.7%
Diamond BarLos Angeles505198.0%98.0%
South GateLos Angeles15415897.5%97.5%
NorwalkLos Angeles11912396.7%96.7%
MonroviaLos Angeles586096.7%96.7%
HillsboroughSan Mateo565896.6%96.6%
GardenaLos Angeles525496.3%96.3%
San LeandroAlameda505296.2%96.2%
National CitySan Diego495196.1%96.1%
WhittierLos Angeles869194.5%94.5%
SalinasMonterey20822194.1%94.1%
Culver CityLos Angeles838993.3%93.3%
Monterey ParkLos Angeles748587.1%89.7%
Baldwin ParkLos Angeles11913786.9%86.9%
ParamountLos Angeles536285.5%78.7%
BurbankLos Angeles24128484.9%84.9%
WestminsterOrange21526082.7%82.7%
TorranceLos Angeles8910882.4%87.8%
Santa AnaOrange25831681.6%81.6%
Laguna BeachOrange668181.5%75.9%
LakewoodLos Angeles9912281.1%85.0%
AlamedaAlameda526580.0%80.0%
CoachellaRiverside12916379.1%79.1%
Imperial BeachSan Diego567178.9%78.9%
Palo AltoSanta Clara13617478.2%78.2%
Santa Cruz County (unincorporated)Santa Cruz435578.2%78.2%
ArtesiaLos Angeles395078.0%78.0%
RosemeadLos Angeles13617876.4%76.4%
San GabrielLos Angeles516875.0%75.0%
AthertonSan Mateo456075.0%75.0%
HaywardAlameda567574.7%74.7%
AlhambraLos Angeles10213774.5%74.5%
GreenfieldMonterey385174.5%74.5%
UplandSan Bernardino658873.9%73.1%
Los GatosSanta Clara537273.6%52.5%
CalexicoImperial719773.2%73.2%
HawthorneLos Angeles7610473.1%73.1%
DowneyLos Angeles14620272.3%80.8%
Pico RiveraLos Angeles9613670.6%70.6%
Marin County (unincorporated)Marin8512269.7%69.1%
Garden GroveOrange43463768.1%68.1%
Santa Clara County (unincorporated)Santa Clara7912165.3%65.3%
Ventura County (unincorporated)Ventura9815264.5%64.5%
BurlingameSan Mateo426663.6%63.6%
ArcadiaLos Angeles9815563.2%63.2%
GlendoraLos Angeles579361.3%61.3%
Huntington BeachOrange8714460.4%59.2%
Simi ValleyVentura12221357.3%57.3%
San BernardinoSan Bernardino23040257.2%57.2%
SeasideMonterey346056.7%56.7%
CampbellSanta Clara529355.9%54.8%
SaratogaSanta Clara11921455.6%55.6%
Santa BarbaraSanta Barbara14125555.3%55.3%
Stanislaus County (unincorporated)Stanislaus10318854.8%54.8%
StantonOrange356553.8%53.8%
CupertinoSanta Clara5911153.2%53.2%
Long BeachLos Angeles6441,21852.9%52.9%
VistaSan Diego10018952.9%52.9%
Santa MariaSanta Barbara47993051.5%51.5%
OrangeOrange8817151.5%51.5%
RiversideRiverside20841550.1%50.1%

Includes places that permitted at least 50 homes in 2025 and where ADUs were more than half under both counting methods. Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Where were ADUs rare?

Some of the places that permitted the most homes overall permitted very few ADUs. Irvine permitted 1,409 homes in 2025, and 8 were ADUs.

Cities that permitted 500+ homes in 2025 with the lowest ADU shares

Where were ADUs rare?
CityCountyADU permits 2025All homes permitted 2025ADU share
IrvineOrange81,4090.6%
MercedMerced35050.6%
Elk GroveSacramento111,5690.7%
ParadiseButte45110.8%
MurrietaRiverside141,4291.0%
LathropSan Joaquin138211.6%
Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Why did the ADU share jump?

Two things happened at once. From 2022 to 2025, ADU permits rose 27.0%, from 25,492 to 32,363. Permits for every other kind of home fell 21.7%, from 116,648 to 91,363. ADUs grew, and the rest of the pie shrank.

Are more ADUs getting finished?

Yes. Cities and counties reported 22,699 ADUs finished in 2025, up 9.4% from 20,740 in 2024 and about seven times the 3,171 reported in 2018. From 2018 through 2025, they reported 102,260 ADUs finished and 172,376 permitted.

California reported 22,699 finished ADUs in 2025, up from 3,171 in 2018

Yearly counts of ADUs permitted and completed. The lines do not track the same set of homes.

California reported 22,699 finished ADUs in 2025, up from 3,171 in 2018Line chart: California ADU completions rose from 3,171 in 2018 to 22,699 in 2025, while ADU permits rose from 8,912 to 32,363.ADU housing units010k20k30k38k8,9123,171201812,7065,895201912,7757,975202020,62310,041202125,49214,015202228,42417,724202331,08120,740202432,36322,6992025ADU permitsADU completionsSource: The Dwelling Index analysis of California HCD Annual Progress Report data (Table A2), file updated Sept. 25, 2026,checked Sept. 29, 2026. Dates matched to report years. dwellingindex.com/research/california-adu-permits/

The lines are separate yearly counts and do not track the same homes. A home completed in 2025 may have received its permit in an earlier year. These totals do not match individual homes.

Line chart: California ADU completions rose from 3,171 in 2018 to 22,699 in 2025, while ADU permits rose from 8,912 to 32,363. Source: California HCD APR data, Table A2.

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Don't divide these two numbers to get a "finish rate." An ADU permitted in 2023 might be finished in 2025. Long Beach shows why: it reported 644 ADU permits and 649 finished ADUs in 2025. More finished than permitted: a home finished in 2025 may have received its permit in an earlier year. These totals do not match individual homes.

A few places report far fewer finished ADUs than permits across many years. Across their available 2018–2025 report years, Huntington Beach listed 513 ADU permits and no finished ADUs, Saratoga 467 and 4, Compton 170 and 11, and Huntington Park 115 and 6. The state file can't tell us whether those homes were finished and not reported, or aren't finished yet. We flag these rows in the data. The four-place check includes the counts, source and exact query.

Is California's ADU boom slowing down?

ADU permits grew 4.1% in 2025, the smallest yearly gain since 2020. Growth was 61.4% in 2021, 23.6% in 2022, 11.5% in 2023 and 9.3% in 2024. The 2025 total, 32,363, is still the highest in this data, which starts in 2018.

It's like a car that's still speeding up, just not as hard as before.

Where did ADU permits grow fastest?

Fastest-growing places for ADU permits, 2021 to 2025

Where did ADU permits grow fastest?
CityADU permits 2021ADU permits 20252025 ÷ 2021
Ontario1115414.0x
Inglewood261475.7x
Coachella241295.4x
Fresno191015.3x
Simi Valley241225.1x
Rancho Cucamonga16815.1x

Places with at least 50 ADU permits in 2025 and at least 10 in 2021. Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Where did ADU permits fall the most?

San Francisco is the big-city standout. It issued 483 ADU permits in 2019 and 171 in 2025.

Largest drops from each place's highest-count year, ADU permits

Where did ADU permits fall the most?
CityPeak yearADU permits in peak yearADU permits 2025Change from peak
Santa Rosa202315447-69%
San Francisco2019483171-65%
Temple City202417669-61%
Sacramento County (unincorporated)202418586-54%
Ventura County (unincorporated)202317098-42%
Burbank2024411241-41%

Places with 2025 Table A2 rows that permitted at least 150 ADUs in their highest-count year from 2018 to 2024. Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Which California counties permit the most ADUs?

Counting the available 2025 city and unincorporated-area records, Los Angeles County issued permits for 13,787 ADUs in 2025, 42.6% of California's total. San Diego County was second with 3,695 (11.4%), and Orange County was third with 2,310 (7.1%).

ADU permits by California county area, 2025

Which California counties permit the most ADUs?
County areaADU permits 2025Share of state ADU permitsADUs completed 2025ADU share of homes permitted (year issued / as filed)Cities and county areas with 2025 rows
Los Angeles13,78742.6%10,26745.2% / 39.5%80 of 87
San Diego3,69511.4%1,59227.8% / 27.7%19 of 19
Orange2,3107.1%1,70438.5% / 35.2%34 of 34
Santa Clara1,5734.9%1,07928.8% / 31.5%16 of 16
San Bernardino1,2293.8%92118.5% / 17.2%24 of 25
Riverside1,2263.8%62412.2% / 11.0%27 of 29
Alameda1,0593.3%81327.2% / 28.0%15 of 15
Santa Barbara9683.0%64241.7% / 42.6%9 of 9
Ventura8012.5%55148.2% / 37.4%10 of 11
San Mateo7112.2%48920.1% / 21.5%21 of 21
Contra Costa5821.8%41332.4% / 28.0%19 of 20
Sacramento5521.7%3867.7% / 7.7%8 of 8
Monterey4581.4%33344.0% / 39.8%12 of 13
San Luis Obispo2780.9%20536.1% / 30.4%8 of 8
Stanislaus2640.8%19426.4% / 26.3%8 of 10
Marin2400.7%17580.0% / 71.8%12 of 12
Kern2390.7%1686.9% / 6.9%12 of 12
Sonoma2360.7%31413.3% / 13.6%10 of 10
Fresno2320.7%1167.5% / 7.3%14 of 16
San Joaquin2100.6%1557.1% / 7.3%8 of 8
Imperial1790.6%10741.7% / 36.5%7 of 8
Placer1740.5%1356.2% / 6.3%6 of 7
San Francisco1710.5%2188.7% / 8.7%1 of 1
Santa Cruz1460.5%18022.0% / 22.6%5 of 5
Tulare1250.4%847.5% / 7.8%9 of 9
Napa1230.4%10728.5% / 29.8%6 of 6
Solano1200.4%1659.0% / 8.5%8 of 8
El Dorado1090.3%7115.4% / 15.2%3 of 3
Yolo820.3%5720.8% / 10.7%5 of 5
Nevada600.2%7422.2% / 21.3%4 of 4
Butte580.2%565.1% / 5.1%6 of 6
Shasta550.2%5318.7% / 18.5%4 of 4
Merced440.1%134.7% / 3.4%6 of 7
Humboldt410.1%7213.9% / 18.5%8 of 8
San Benito340.1%3612.4% / 11.2%3 of 3
Mendocino260.1%2828.0% / 25.1%5 of 5
Madera240.1%222.2% / 2.2%2 of 3
Tehama200.1%821.7% / 22.3%2 of 3
Kings140.0%72.9% / 2.9%5 of 5
Mono130.0%622.8% / 22.8%2 of 2
Yuba110.0%32.4% / 1.2%3 of 3
Inyo100.0%258.8% / 40.0%2 of 2
Plumas100.0%018.2% / 18.2%2 of 2
Amador90.0%914.5% / 13.5%5 of 6
Del Norte90.0%1412.5% / 17.3%1 of 2
Mariposa90.0%016.4% / 16.4%1 of 1
Sutter70.0%81.9% / 1.9%3 of 3
Lake60.0%24.7% / 4.3%3 of 3
Tuolumne50.0%05.7% / 6.1%2 of 2
Calaveras50.0%67.5% / 8.8%2 of 2
Siskiyou50.0%210.0% / 5.9%5 of 10
Lassen40.0%323.5% / 27.8%2 of 2
Colusa30.0%34.9% / 4.9%3 of 3
Modoc20.0%018.2% / 18.2%1 of 2
Glenn00.0%20.0% / 0.0%2 of 3
Alpine00.0%20.0% / 0.0%1 of 1
Sierra00.0%00.0% / 0.0%1 of 1
Trinity00.0%30.0% / 0.0%1 of 1

A county area adds up available city and unincorporated-area records with 2025 Table A2 rows (for example, 80 of the 87 Los Angeles County jurisdiction/county groups represented in the historical file). These coverage counts describe the file, not a complete list of legal jurisdictions. San Francisco is counted once as a city and county. Shares are rounded to one decimal; a small nonzero share can round to 0.0%. Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Does "Los Angeles County" include the City of Los Angeles?

It depends on which row you're reading. The county government's own row covers only the unincorporated area. The county-area total adds in cities with 2025 rows.

Three ways to count "Los Angeles" ADUs, 2025

Does "Los Angeles County" include the City of Los Angeles?
GeographyADU permits 2025ADUs finished 2025
City of Los Angeles7,4515,883
Los Angeles County, unincorporated area only1,361811
Los Angeles County area: cities with 2025 rows plus unincorporated area13,78710,267
Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Never add the county-area total to its city rows. The cities are already inside it.

Why does adding up the state's file give a bigger number?

Add up the ADU building-permit column in the state's 2025 file and you get 41,851. But 9,488 of those units have a permit date outside 2025 (9,472) or no date at all (16). Counting only ADUs permitted in 2025 gives 32,363.

Here's why that happens. The state's reporting instructions tell cities that activity from prior years "may be included but is not required" (HCD reporting instructions). So some 2025 reports also list ADUs permitted in earlier years. Sum the column, and those homes can get counted again — like a school counting a student twice because they're on last year's roster and this year's.

Where the extra ADU units come from, 2025 reports

Why does adding up the state's file give a bigger number?
CityADU permits in 2025 report (as filed)ADU permits issued in 2025Units dated outside 2025 or undated
Los Angeles12,3327,4514,881
Fullerton589168421
Lakewood49899399
Glendale695371324
Campbell34052288
All of California41,85132,3639,488
Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.

Five cities account for 6,313 of the 9,488 extra units, about two-thirds. Los Angeles alone accounts for 4,881.

The date-matched counts are close to, but do not reproduce, HCD's published handbook totals. HCD's March 2026 ADU Handbook says California permitted 30,354 ADUs in 2024, more than 26.6% of all homes permitted (HCD ADU Handbook, March 2026). Our date-matched method gives 31,081 for 2024 in the September 25 file (26.1%), 2.4% higher. The handbook does not give the query and frozen data needed to show whether the difference comes from revisions, counting rules, or both.

Some of the older-dated units may be late entries rather than repeats. Those older-dated units were not permitted in 2025; the 16 undated units cannot be assigned to a permit year from the recorded date.

Why do these numbers matter now?

Every California city and county must send the state an Annual Progress Report by April 1 covering the year before, and HCD uses the building permits in those reports as its key yardstick for progress toward each place's state-assigned housing goal (HCD Annual Progress Reports). State law lets ADUs count toward that goal (HCD ADU Handbook, March 2026). That goal is called the Regional Housing Needs Allocation, or RHNA: the number of homes each city and county must plan for.

An ADU permit records permission to build, not a finished home. Issued permits help track progress toward the housing goal. When other home permitting falls, as it did from 2022 to 2025, ADUs can carry a larger share of that count.

The rules keep moving, too. In December 2025, HCD added an addendum to its ADU Handbook covering changes to state ADU law that took effect January 1, 2026 (HCD ADU Handbook page). HCD now also publishes a March 2026 handbook. Our plain-English guide to California's ADU rules walks through what's allowed.

Some readers are behind next year's numbers: homeowners thinking about an ADU of their own. After "Can I build one?" come "What will it cost?" and "How do I pay for it?" Start with what an ADU costs to build and how Californians pay for ADUs. For a quick read on your own lot, The Dwelling Index's free Check My Property tool is the place to start.

For numbers beyond California, see our ADU statistics page.

How we built this

We started with the state's own data and counted it one consistent way.

  1. Source. The California Department of Housing and Community Development (HCD) publishes cities' and counties' reported housing activity on the California Open Data Portal. We used Table A2, the building-activity table (922,507 rows, file last updated Sept. 25, 2026), and queried it on Sept. 29, 2026 through the portal's public data tool.
  2. What we counted. Housing units in the "ADU" category. A permit counts in a year only when its permit date falls in that report year. A finished ADU counts only when its certificate-of-occupancy or other-readiness date falls in that same report year. We counted all homes the same way, so every share compares like with like.
  3. Cities and counties. Each city and each county's unincorporated area stays its own row. County-area totals add them up once.
  4. Missing is not zero. A blank cell means the state file has no rows for that place in that year. A 0 means the place has Table A2 rows but no units met that column's ADU category and date rules. Neither a blank nor a zero proves nothing was built.
  5. Checks. The city and unincorporated-area rows add up exactly to the statewide totals for every year. We checked every published city-year count against a fresh total calculated from the state records. All eight yearly checks matched. We separately reran the statewide query and recomputed every share, change, rank, subset and county total. The exact queries and checks are in the reproduction files. Our method lands within 2.4% of HCD's published 2024 total (31,081 vs. 30,354) and within 5.6% of its January 2025 figure for 2023 (28,424 vs. 26,924), without enough detail in the handbooks to reconcile the differences. The San Francisco Chronicle's July 2026 analysis reported Hillsborough at 56 ADUs of 58 homes and Atherton at 45 of 60; our numbers are the same (San Francisco Chronicle).
  6. The majority rule. A place counts as ADU-majority if it permitted at least 50 homes in 2025 and ADUs were more than half under both counting methods. Here's how the count moves with the cutoff:

How the "ADUs were most homes permitted" count changes with the rules, 2025

How we built this
Places includedCountADUs were more than half (both methods)Date-matched methodAs-filed method
Cities and counties with 20+ homes permitted372106117107
Cities and counties with 50+ homes permitted (our headline rule)293627163
Cities and counties with 100+ homes permitted211344035
Cities only, 100+ homes permitted183303531
Source: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, checked Sept. 29, 2026.
  1. Coverage. The file contains 534 jurisdiction/county groups across the 2018–2025 report years. This is the file's coverage, not a complete legal-jurisdiction list. 503 have 2025 rows. These 31 have none for 2025: Alturas, Apple Valley, Azusa, Banning, Canyon Lake, Clayton, Colfax, Compton, Corning, Crescent City, Dorris, Dos Palos, Dunsmuir, Etna, Fort Jones, Glenn County (unincorporated), Hughson, Irwindale, Lawndale, Lynwood, Madera, Mount Shasta, Plymouth, Pomona, San Joaquin, Sand City, Sanger, Santa Paula, Turlock, West Covina, Westmorland.
  2. Undated units. 16 ADU units in the 2025 file had no permit date and are left out of the permit count. One completion unit had no readiness date and is left out of the completion count.

Anyone can rerun the statewide count at the portal's public data tool (data.ca.gov/api/3/action/datastore_search_sql):

``sql SELECT "YEAR", SUM(CASE WHEN "NO_BUILDING_PERMITS" ~ '^[0-9]+$' AND left("BP_ISSUE_DT1",4) = "YEAR" THEN "NO_BUILDING_PERMITS"::int ELSE 0 END) AS adu_permits, SUM(CASE WHEN "NO_OTHER_FORMS_OF_READINESS" ~ '^[0-9]+$' AND left("CO_ISSUE_DT1",4) = "YEAR" THEN "NO_OTHER_FORMS_OF_READINESS"::int ELSE 0 END) AS adu_completed FROM "fe505d9b-8c36-42ba-ba30-08bc4f34e022" WHERE "UNIT_CAT" = 'ADU' GROUP BY "YEAR" ORDER BY "YEAR"; ``

Remove the WHERE "UNIT_CAT" = 'ADU' line to count all homes. To reproduce the full city file, group all unit categories by "JURIS_NAME", "CNTY_NAME" and "YEAR", and put the ADU test inside each sum instead of filtering out non-ADU rows first. That keeps places that have housing rows but no ADU activity. Join those results to all jurisdiction/county groups seen in 2018–2025; leave absent years blank. The full aggregation query records the exact fields and checks. Our full research methodology covers our general standards.

What does this data show, and what doesn't it?

It shows reported ADU permitted units by city and county area for 2018–2025, city completions for 2024–2025, and statewide completions for 2018–2025, counted one consistent way.

It doesn't show every ADU that exists in California, or ADUs built without permits. It doesn't give a finish rate, because a permit and a finish often land in different years. It doesn't show cost, size, rent, or why one city permits more than another. We did not match individual projects or remove repeated events within a report year. An older permit first listed only in a later report is outside this date-matched series. Counts are gross reported units, not net additions after demolitions. Yearly changes can also reflect changes in which places report and how they fill in the form.

Cities and counties fill in these reports themselves, and HCD can revise the file. HCD notes that a year's data isn't complete until June 30 of the following year (HCD APR dashboard); these 2025 figures were checked after that date. The form has no separate category for junior ADUs (small units carved out of an existing home), so junior ADUs enter these counts only where the jurisdiction classified them as ADUs.

How to cite this page

Suggested Citation

Dwelling Index. (2026). California ADU permits and completions by city (2018–2025). Retrieved from https://dwellingindex.com/research/california-adu-permits/

Ready-to-copy citation:

The Dwelling Index. (2026, September 29). California ADU permits and completions by city (2018–2025). https://dwellingindex.com/research/california-adu-permits/. Data: California Department of Housing and Community Development, Housing Element Annual Progress Reports, Table A2 (file updated Sept. 25, 2026).

Ready-to-copy sentence:

California cities and counties reported 32,363 ADU housing units permitted in 2025, more than 1 in 4 homes permitted, according to The Dwelling Index's date-matched analysis of HCD Table A2 (source checked September 29, 2026).

To cite one city, use the Copy button on its row in the table; each row also has its own link.

You're welcome to reuse our original tables, charts and analysis with credit to The Dwelling Index, under CC BY 4.0. The underlying figures come from California HCD, so keep that credit too, and follow the state portal's terms for the raw data.

Download the data

Three free files, no sign-up:

Chart files: permit-share chart, top-ten-city chart, and permits-and-completions chart. The reproduction files include the exact queries and source checks.

What the main columns mean

Download the data
ColumnMeaning
adu_permits_YYYYADU housing units whose permit date matches that report year; blank = no Table A2 rows for that place that year
adu_completed_YYYYADU housing units whose certificate of occupancy or other readiness date matches that report year; city columns cover 2024–2025
all_homes_permitted_2025All housing units permitted in 2025, same counting rule
adu_share_of_homes_permitted_2025_pctADU permits ÷ all homes permitted, 2025
..._as_filedThe same figure summed from everything in the 2025 report, including units dated in other years or undated
adu_majority_2025"yes" if the place permitted 50+ homes and ADUs were more than half under both methods
data_notePlain-language flags for gaps or unusual filings

Source for all files: The Dwelling Index analysis of California HCD Annual Progress Report data, Table A2, file updated Sept. 25, 2026, checked Sept. 29, 2026.

Frequently asked questions

How many ADUs were permitted in California in 2025?

California cities and counties issued permits for 32,363 ADUs in 2025, up 4.1% from 31,081 in 2024. That counts housing units whose permits were issued in 2025, as reported to the state.

What percent of new homes in California are ADUs?

ADUs were 26.2% of the homes permitted in California in 2025 (32,363 of 123,726) and 20.2% of the homes finished (22,699 of 112,286). In 2018, they were 7.8% of homes permitted.

Which California city issues the most ADU permits?

Los Angeles, with 7,451 ADU permits in 2025, or 23% of the state's total. San Diego was second with 2,165.

How many ADUs were finished in California in 2025?

Cities and counties reported 22,699 finished ADUs in 2025, up 9.4% from 20,740 in 2024. From 2018 through 2025, they reported 102,260.

Why do other sources give different numbers?

They can count a different year, stage or set of records. California YIMBY put ADUs at 19% of homes produced in 2022 (California YIMBY). The Terner Center used "about 20 percent" on November 13, 2025, citing that 2024 report—not a new 2026 count (Terner Center). About 20% can also describe a different stage: our 2025 completion share is 20.2%, while the permit share is 26.2%.

HCD's March 2026 handbook gives 30,354 permits for 2024; our date-matched count from the September 25 file is 31,081. We cannot establish the cause of that difference from the handbook. Summing the raw 2025 column gives 41,851 because it includes permits dated in other years and 16 undated units.

A February 2025 state Senate fact sheet said over 23,000 ADUs were completed in 2023 (California Senate Housing Committee). The September 25 APR file gives 17,724 when completion dates match the 2023 report year and 18,549 without that date filter. The fact sheet does not explain how its count was made, so these figures remain unreconciled.

Does this include junior ADUs?

The state's form has no separate category for junior ADUs, so junior ADUs enter these counts only where the jurisdiction classified them as ADUs. This page doesn't give a separate junior-ADU total.

Why does my city show no 2025 numbers?

31 cities and county areas have no 2025 rows in the state file as of Sept. 29, 2026. That means there are no Table A2 activity rows for that year. It does not establish that no APR was submitted or that nothing was built.

Can a city finish more ADUs than it permits in a year?

Yes. Long Beach reported 644 ADU permits and 649 finished ADUs in 2025. Permits and finishes are separate yearly counts, so a home finished in 2025 may have received its permit earlier. These counts do not match individual homes.

When will 2026 numbers come out?

Cities and counties must report 2026 activity by April 1, 2027 (HCD instructions), and HCD says a year's data isn't complete until June 30 of the next year (APR dashboard). We'll update this page when most places have 2026 rows in the state file.

Sources

  1. California Department of Housing and Community Development (HCD), Housing Element Annual Progress Report data, Table A2, California Open Data Portal. <https://data.ca.gov/dataset/housing-element-annual-progress-report-apr-data-by-jurisdiction-and-year/resource/fe505d9b-8c36-42ba-ba30-08bc4f34e022> — file updated Sept. 25, 2026; checked Sept. 29, 2026.
  2. HCD, Housing Element Annual Progress Report (APR) Data by Jurisdiction and Year (dataset page). <https://data.ca.gov/dataset/housing-element-annual-progress-report-apr-data-by-jurisdiction-and-year> — checked Sept. 29, 2026.
  3. HCD, Housing Element Annual Progress Report Instructions. <https://www.hcd.ca.gov/sites/default/files/docs/planning-and-community/housing-element-annual-progress-report-instructions.pdf> — checked Sept. 29, 2026.
  4. HCD, Annual Progress Reports – Data Dashboard and Downloads. <https://www.hcd.ca.gov/housing-open-data-tools/apr-dashboard> — checked Sept. 29, 2026.
  5. HCD, Annual Progress Reports. <https://www.hcd.ca.gov/apr> — checked Sept. 29, 2026.
  6. HCD, Accessory Dwelling Unit Handbook, March 2026. <https://www.hcd.ca.gov/sites/default/files/docs/policy-and-research/adu-handbook-update.pdf> — checked Sept. 29, 2026.
  7. HCD, Accessory Dwelling Unit Handbook, January 2025. <https://ahcd.assembly.ca.gov/system/files/2025-03/adu-handbook-update.pdf> — checked Sept. 29, 2026.
  8. HCD, Accessory Dwelling Unit Handbook (copy hosted by the Assembly Housing and Community Development Committee). <https://ahcd.assembly.ca.gov/system/files/2025-03/adu-handbook-update.pdf> — checked Sept. 29, 2026.
  9. HCD, ADU Handbook page (December 2025 addendum). <https://www.hcd.ca.gov/building-standards/adu/handbook> — checked Sept. 29, 2026.
  10. San Francisco Chronicle, "Wealthy Bay Area cities are making progress on housing goals via ADUs," July 26, 2026. <https://www.sfchronicle.com/realestate/article/adu-home-housing-hillsborough-atherton-22359055.php> — checked Sept. 29, 2026.
  11. Terner Center for Housing Innovation, California Housing Supply and Land Use Legislative Round-Up 2025, November 13, 2025. <https://ternercenter.berkeley.edu/research-and-policy/california-housing-supply-and-land-use-legislative-round-up-2025/> — checked Sept. 29, 2026.
  12. California Senate Housing Committee, recent legislative actions fact sheet, updated February 2025. <https://shou.senate.ca.gov/system/files/2025-02/recent-leg-actions-factsheet-updated-feb-2025.pdf> — checked Sept. 29, 2026.
  13. California YIMBY, "California ADU Reform: A Retrospective," 2024. <https://cayimby.org/reports/california-adu-reform-a-retrospective/> — checked Sept. 29, 2026.