Do you need a permit for a detached garage in Austin, TX?
It depends on size and placement.
Building permit: A garage is bigger than Austin's 200 sq ft accessory exemption, so it needs a building permit.
Floodplain development permit: If the lot is in a FEMA special flood hazard area, all development there needs a permit.
Rules last checked by a person on October 19, 2026. Guidance only; confirm with Austin 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 detached garage can need in Austin
| Permit | When it applies |
|---|---|
| Building permit | A garage is bigger than Austin's 200 sq ft accessory exemption, so it needs a building permit. |
| Floodplain development permit | If the lot is in a FEMA special flood hazard area, all development there needs a permit. |
| Electrical permit | Wiring needs its own permit.Confidence: medium |
Local details
- 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.
How to apply
- Austin Build + Connect (AB+C)
- Work exempt from building permits
- City and Land Development Code
- Phone: 311 (512-974-2000)
Questions people ask
- When does a detached garage need a building permit in Austin?
- A garage is bigger than Austin's 200 sq ft accessory exemption, so it needs a building permit. Only one-story detached structures up to 200 sq ft and 15 ft tall are exempt.
- Where do I apply for a detached garage permit in Austin?
- Apply through Austin Build + Connect (AB+C), or call 311 (512-974-2000).
Sources
- City of Austin, Work Exempt from Building Permits. Checked 2026-10-19.
A one-story detached accessory structure that is no more than 200 square feet of floor area, no more than 15 feet in height, does not create a dwelling, contains no plumbing, and is not located within a flood hazard area.
- 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...
- 2024 IRC R105.2, Work exempt from permit (text published by the City of Benson, AZ). Checked 2026-10-19.
One-story detached accessory structures, provided that the floor area does not exceed 200 square feet. Fences not over 7 feet high. Decks not exceeding 200 square feet in area, that are not more than 30 inches above grade at any point, are not attached to a…