ADU Laws by State: Texas vs Florida vs New York vs California (2026)

Why ADU law varies so much by state

An accessory dwelling unit, whether it's a backyard cottage, a garage conversion, or an attached in-law suite, is a zoning question before it is a design question. Zoning is controlled locally in most states, which means the same ADU idea can be a same-day permit in one jurisdiction and a variance hearing in the next. Some states have stepped in with laws that override local zoning and force cities to allow ADUs on certain terms. Other states have left the question entirely to individual cities and counties, which means your rules depend on which side of a city line your lot happens to fall on.

This matters before you design anything because the legal framework sets the outer limits of the project: whether an ADU is allowed at all, how big it can be, whether the owner has to live on-site, how long the city has to approve or deny your permit, and whether parking or setback rules can kill an otherwise-good design. Get this wrong at the start and you can end up redesigning a project after the fact to fit rules you didn't know applied.

For a general introduction to what ADUs are, typical costs, and the general design and permitting process, see our companion primer, ADU Plans 101: Rules, Costs, and Timelines. This article goes deeper: a state-by-state legal comparison for the four states Apex Drafting Services serves most, Texas, Florida, New York, and California, current as of mid-2026.

Texas: no statewide mandate, entirely city-by-city

Texas has no statewide law requiring cities to allow ADUs. Regulation is set entirely at the city level, and there is real, meaningful variation between Texas cities on this point.

In 2025, Texas came close to changing that. SB 673 would have preempted local restrictions on ADUs statewide, similar in spirit to what California has done. The bill passed the Texas Senate but died in the House on June 2, 2025. As of mid-2026, it has not been reintroduced into law, so Texas ADU policy remains a city-by-city patchwork.

Here's how that patchwork actually looks in practice across four major Texas cities:

If you're drafting ADU plans in Texas, the city you're building in determines your entire path, not just your permit paperwork. We serve Austin, Dallas, Houston, Fort Worth, and San Antonio, and we build plans to match each city's specific rules from the start.

Florida: a real statewide mandate as of mid-2025

Florida is different from Texas in one crucial way: it has an actual statewide ADU law on the books. SB 184, passed in the 2025 session and effective July 1, 2025, requires local governments across Florida to allow at least one ADU on single-family-zoned lots. It also bars certain restrictive local provisions, including extra parking mandates that go beyond what the law permits.

That said, SB 184 sets a floor, not a full statewide design code. Local jurisdictions still set the specifics, size limits, setback requirements, and permitted parking rules, within the boundaries SB 184 establishes. So while every Florida city and county now has to allow ADUs on qualifying lots, the exact dimensions and site requirements still vary by jurisdiction.

A follow-up bill, SB 48, would have strengthened the statewide mandate further. It passed the Florida Senate 38-0 in the 2026 session but died in the House on March 13, 2026. SB 48 is not enacted law. If you see it referenced as current policy, that's incorrect as of this writing.

We work with homeowners across Florida's largest metros on ADU design, including Miami, Tampa, Orlando, and Jacksonville, all of which now operate under the SB 184 statewide floor with their own local specifics layered on top.

New York: no statewide mandate, but a major NYC-specific unlock

New York State has no statewide ADU mandate. A statewide bill has been introduced repeatedly since 2021 and has never passed. Governor Hochul proposed a statewide ADU framework in 2022, but it was withdrawn after opposition from suburban areas and Long Island. As of mid-2026, there is still no statewide law requiring New York municipalities to allow ADUs.

The one significant legal change in New York is specific to New York City. The City of Yes for Housing Opportunity passed the NYC Council on December 5, 2024. Its implementing rules, Local Laws 126 and 127, govern what the city calls Ancillary Dwelling Units, capped at up to 800 square feet and limited to owner-occupied one- and two-family homes. The NYC Department of Buildings began accepting ADU permit applications under this framework in September 2025.

It's important not to read this as a statewide change. City of Yes is a New York City law. Buffalo, Rochester, Albany, and Long Island remain governed municipality by municipality, with no comparable statewide or citywide unlock in place. If you own property outside NYC, you cannot assume City of Yes applies to you.

We serve homeowners across the state's major metros, including New York City, where City of Yes now applies directly, as well as Long Island, Albany, Buffalo, and Rochester, where local ordinances still govern.

California: the most permissive statewide ADU framework in the country

California is in a different category entirely. Since 2020, the state has built a stack of laws that override most local restrictions on ADUs, and it has kept adding to that stack every year since.

Taken together, this is the most permissive statewide ADU framework in the United States. A California homeowner today can build an ADU without living on-site, get a guaranteed minimum size, force a fast and now firmly-enforced approval clock, and in a growing number of cities, even sell the ADU as a separate condo unit.

We design ADUs across California's major metros, including Los Angeles, San Diego, Sacramento, Riverside, and Fresno.

How the four states compare, ranked by ADU-friendliness

Based strictly on the current legal frameworks above, here's how Texas, Florida, New York, and California stack up:

The real distinction between Texas and New York is worth being precise about: both are "no statewide mandate" states, but New York has one significant, codified legal unlock (City of Yes) covering its largest city, while Texas has no equivalent single event. Texas's variation is purely a product of independent city policy choices, none of which trace back to a common statewide law that almost passed and then didn't, the way NYC's does.

FAQ: ADU laws by state

Ready to design your ADU?

Whether your state has a statewide mandate or your project depends entirely on city ordinance, Apex Drafting Services builds ADU plans around the rules that actually apply to your lot. See our full ADU Plans & Design service, or start with the general overview in ADU Plans 101: Rules, Costs, and Timelines.