Texas ADU Laws (2026): What You Can Actually Build — by City

Texas ADU Laws at a Glance

Each city verified against official sources. See city sections below for full details.

Are ADUs Legal in Texas?

Yes — but not because Texas passed one clean law that says so. There's no California-style statewide mandate forcing every city to allow ADUs. Texas is local-rule territory. Your city council, not the state legislature, decides whether you can build a backyard home.

That means the difference between cities is massive. In Austin, you can build an ADU, potentially sell it separately through a condominium regime, and rent the other unit. In Dallas, you may need city action through an overlay process or Board of Adjustment before you can legally build or rent one. Same state. Completely different realities.

This matters because most of what you'll find online treats "Texas ADU laws" like a single answer. It's not. The pages that tell you "Texas allows ADUs" without telling you what your city allows are wasting your time — or worse, setting you up to spend money on plans you can't use.

Here's the framework that actually works: your project lives or dies at five levels, and you need to clear all of them.

1. 1State law — Texas doesn't block ADUs, but doesn't mandate them either.
2. 2City zoning — This is where the real rules live.
3. 3Lot requirements — Size, setbacks, coverage limits, utilities.
4. 4Deed restrictions and HOA — Private rules that can override everything the city allows.
5. 5Intended use — Family housing, long-term rental, and short-term rental are treated differently.

The rest of this guide breaks down each level, starting with the state legislation everyone keeps asking about.

Did Texas Pass a Statewide ADU Law?

No. Not yet. And this is where most of the confusion on the internet comes from. Two bills have made serious runs at creating statewide ADU rules in Texas. Both failed. Understanding what happened — and what didn't happen — will save you from building on bad information.

SB 673 (2025): Passed the Senate, Died in the House

SB 673, introduced by Senator Bryan Hughes, would have been the most significant ADU legislation in Texas history. It passed the full Texas Senate and was placed on the House General State Calendar on May 26, 2025. Then the session ended. The bill never received a House floor vote.

Here's what SB 673 would have done if it had passed:

• Required every city and county to allow ADUs on single-family and unzoned lots
• Prohibited local rules banning ADU construction, mandating owner occupancy, or imposing excessive parking or size limits beyond what applies to single-family homes
• Created a 60-day ministerial permit timeline — if the city didn't act, your permit would have been automatically approved
• Allowed lots of 10,000+ square feet to have two ADUs
• Preserved HOA, deed restriction, and historic preservation authority

That last point is important: even SB 673 wouldn't have overridden your HOA.

Source: Texas Legislature Online, SB 673, 89th Legislature Regular Session. Last action: 05/26/2025 — Placed on General State Calendar.

SB 1412 (2023): Also Failed

Before SB 673, there was SB 1412 in the 2023 session. It also aimed to create statewide ADU rules. Texas Legislature records show SB 1412 failed to pass to third reading in the House on May 22, 2023.

Despite this, multiple commercial pages still reference SB 1412 as if it changed Texas law. That's not accurate. The bill didn't pass.

Source: Texas Legislature Online, SB 1412, 88th Legislature Regular Session

What This Means for Your Project Right Now

If you're reading an article that says Texas "passed" or "enacted" statewide ADU legislation — close it. It's wrong. The practical reality as of April 2026:

What Actually Counts as an ADU in Texas?

Before you go any further, make sure you and your city are talking about the same thing. An ADU is a legal dwelling unit — not just a building in your backyard. The distinction matters because it changes your permit path, your cost, and whether your structure is actually recognized as a place someone can live.

In Austin, a structure qualifies as a dwelling unit when it has habitable space, a full bathroom, and a sink or dishwasher outside the bathroom. In Denton, the standard is cooking, sleeping, and sanitary facilities. San Antonio uses similar criteria. The moment your backyard structure has a bathroom and a kitchen, you're in ADU territory — which means full residential permits, inspections, and code compliance.

A shed with electricity is a shed. A shed with a bathroom and kitchenette is a dwelling unit, and it gets treated like one.

ADU Types in Texas

Which Texas Cities Are Actually ADU-Friendly Right Now?

Below is each major Texas city with the rules that matter — sourced directly from official city pages and municipal codes.

What About Other Texas Cities and Suburbs?

If you live in Plano, Arlington, Frisco, McKinney, Round Rock, Georgetown, Sugar Land, or any other Texas city not listed above — your first step is identical: contact your city's planning and zoning department and ask these five questions.

1. 1
   Does the city allow accessory dwelling units in residential zones? If not, ask whether there's a variance or special exception process.
2. 2
   What are the size, setback, and lot coverage limits? Get the specific numbers for your zoning district, not a general answer.
3. 3
   Is owner-occupancy required? This determines whether an ADU works for investors or only for owner-occupants.
4. 4
   Can the ADU be rented? And if so, are short-term rentals allowed or restricted?
5. 5
   What is the permit process and approximate timeline? Ask whether it's administrative (staff review only) or discretionary (requires a public hearing).

Write down the answers, ask for the specific municipal code sections, and keep that documentation. You'll need it for your architect, your lender, and your insurance company.

Can I Build an ADU on My Property? The Real Qualification Stack

Most ADU projects in Texas don't fail because of the concept. They fail because of a property-level issue that could have been caught in the first week. Here's the qualification stack. You need to clear every level, in order, before spending real money on design or construction.

What Usually Kills an ADU Project in Texas

Building an ADU in Texas is harder than it should be. The lack of a statewide law means you're navigating a patchwork of local rules, private restrictions, and infrastructure questions that other states have already simplified.

But Texas homeowners are building ADUs every single day. Austin, Houston, San Antonio, and Denton all have functional permit paths. The homeowners who succeed are the ones who do their homework before writing their first check. Here are the five most common project-killers:

How the Texas ADU Permit Process Works

Even though each city has its own portal and its own quirks, the general process pattern is consistent across Texas.

How Hard Is Each City?

Austin, Houston, San Antonio, and Denton are administrative-review cities. Dallas is the outlier that requires a public hearing process.

Can You Rent Out an ADU in Texas?

Usually yes for long-term rental, if the unit is legally permitted. But there's no single Texas rule — and short-term rental is where things get complicated.

If rental income is your primary goal, verify three things before spending money:

1. 1City rules — Does your city allow ADU rental? Under what conditions?
2. 2Deed restrictions — Do they prohibit renting secondary structures?
3. 3STR licensing — If you want short-term rental, what license is required and are there caps?

What Changes Outside City Limits?

If your property is in an unincorporated area — outside any city's limits — you might assume it's a free-for-all. It's not quite that simple.

Most rural Texas counties don't have zoning. That means there's typically no ADU-specific code — no one to tell you that you can or can't build a secondary dwelling. But "no ADU code" doesn't mean "no rules."

County rules vary, but outside city limits you may still need to navigate:

• County building permits or approvals for habitable structures. Travis County, for example, routes non-habitable accessory buildings through a different process than habitable structures.
• Septic regulations. Outside city sewer service, you'll need an approved septic system — and adding a second dwelling may require an upgraded or new system.
• Well or water supply. If you're on a well, adding a dwelling increases demand on that system.
• Floodplain rules. County floodplain regulations apply regardless of zoning status.
• Deed restrictions. Yes, even in rural areas.

Contact your county's building department or development services office. Ask whether they issue permits for habitable accessory structures, what code they enforce, and what additional approvals you need for septic, well, and utilities.

Source: Travis County Development Services, Accessory Building Permit

How to Pay for a Texas ADU

A full financing guide lives on its own page — here's the quick overview, because "can I afford this?" is the question right behind "can I legally do this?"

ADU costs vary widely by city, lot conditions, project type, and finish level. Garage conversions are generally the most affordable path; custom site-built detached units are the most expensive; prefab and modular units fall in between.

Each path has different qualification requirements, costs, and tradeoffs. For a detailed comparison, see our ADU types guide and full ADU cost breakdown.

What About Property Taxes?

Adding a permitted ADU can increase your property's assessed value and property taxes. Texas has no state property tax — local taxing units set rates, and county appraisal districts value property locally. Check your county appraisal district for the current rules and rates that apply to your parcel.

Source: Texas Comptroller, Property Tax Basics

What Should You Do Next?

The right next step is not "call a builder and hope." It's a structured pre-flight check that takes an afternoon — and saves you from the most expensive mistakes.

Frequently Asked Questions About Texas ADU Laws

Sources and Methodology

This guide was compiled from official municipal sources and state legislative records. We verified each city's rules against the most current publicly available documentation from official city and state websites.

This guide is educational content from an independent resource. The Dwelling Index is not a lender, broker, or builder. We do not guarantee the accuracy of local regulations, which change frequently. Always verify current rules with your city's planning department before making financial commitments.