ADU rules 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.

Good to know

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.

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...