When does a deck need a building permit in Austin?

Austin exempts only freestanding decks up to 200 sq ft and 30 in above grade that don't provide egress and aren't in a flood hazard area. Freestanding decks up to 200 sq ft and 30 in high, not providing egress and outside flood hazard areas, are exempt.

Where do I apply for a deck permit in Austin?

Apply through Austin Build + Connect (AB+C), or call 311 (512-974-2000).

Do you need a permit for a deck in Austin, TX?

It depends on size and placement.

Exempt decks max out at 200 sq ft and 30 in above grade at any point.

A deck that is attached or provides egress needs a permit.

Flood hazard areas void the deck exemption.

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 deck can need in Austin

Permit	When it applies
Building permit	Austin exempts only freestanding decks up to 200 sq ft and 30 in above grade that don't provide egress and aren't in a flood hazard area.
Floodplain development permit	If the lot is in a FEMA special flood hazard area, all development there needs a permit.

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

Questions people ask

When does a deck need a building permit in Austin?: Austin exempts only freestanding decks up to 200 sq ft and 30 in above grade that don't provide egress and aren't in a flood hazard area. Freestanding decks up to 200 sq ft and 30 in high, not providing egress and outside flood hazard areas, are exempt.
Where do I apply for a deck 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...