Do you need a permit for an ADU in Houston, TX?
Yes. A second dwelling needs a residential building permit.
Rules last checked by a person on October 19, 2026. Guidance only; confirm with Houston before you build.
Check your exact lot
Setbacks depend on your zoning district, and a flood zone can change the permit answer. Enter your address to see both.
Permits a ADU can need in Houston
| Permit | When it applies |
|---|---|
| Building permit | A second dwelling needs a residential building permit. |
| Floodplain development permit | If the lot is in a FEMA special flood hazard area, all development there needs a permit. |
Local details
- No city zoning limits ADUs in Houston, but many deed restrictions ban or limit second units. Your restrictions decide this one.
- Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
- HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.
- Houston has no zoning. Deed restrictions cover a large share of the city and often set fence heights, setbacks and whether a second unit is allowed. Check your subdivision's restrictions (Harris County Clerk records) before you build.
How to apply
- Houston Permitting Center
- Phone: (832) 394-9000
Questions people ask
- When does a ADU need a building permit in Houston?
- A second dwelling needs a residential building permit.
- Where do I apply for a ADU permit in Houston?
- Apply through Houston Permitting Center, or call (832) 394-9000.
Sources
- Houston Permitting Center, 2021 IRC significant changes and Houston amendments. Checked 2026-10-19.
The floor area limit for one story accessory structures has been reduced from 200 SF to 120 SF. Height limit of fences not requiring permit increased to 8 ft from 7 ft with an added provision that they are not constructed of masonry or concrete, and that ar…
- 44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19.
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
- 44 CFR 60.3, floodplain management criteria. Checked 2026-10-19.
Require permits for all proposed construction or other development in the community...