Regulations & Permits

ADU rules change fast and they vary enormously by state, county, and city. A setback that's legal in one ZIP code is a flat-out denial in the next. Our regulations guides are built on official municipal and state-government sources — not aggregator scrapes — and we cite the actual statute, ordinance, or planning department PDF for every rule we report. We focus on what homeowners actually need to know to plan: permitted ADU types, size and height limits, setback rules, owner-occupancy requirements, parking exemptions, and realistic permit timelines. Every state and major-city guide is reviewed against the current code, with the source date noted so you can verify the rules haven't shifted between our review and your application.