Can I Build Second Story Addition in Austin, TX? (2026)
Find out if you can build a second story addition in Austin, TX. Rules, permit requirements, costs, and next steps.
Adding a second story in Austin, TX is possible in most zones, subject to height limits and structural permit requirements.
A second story addition is one of the most complex home improvement projects in Austin, TX. It requires a full building permit, structural engineering review, and must comply with the height limits for your zoning district. Unlike a ground-floor addition, a second story changes the roofline and structural load path of your entire home, triggering stricter engineering requirements. In Austin, zone height limits range from varies feet in SF-1 zones — verify your zone before planning.
Second Story Addition Rules in Austin
Second Story Addition Rules in Austin: Building permit required: Yes — all second story additions require a permit. Example height limit (SF-1): varies feet. Structural engineering drawings required. Setbacks apply to the full structure height.
Costs & Fees
Contact the local building department for current permit fees. Budget separately for structural engineering.
Next Steps
Next steps for adding a second story in Austin: 1. Hire a structural engineer to assess your existing foundation and framing capacity. 2. Confirm your zone height limit and verify the addition meets all setback requirements. 3. Submit full structural plans and permit application to the local building department. 4. Inspections required at foundation reinforcement, framing, shear panels, and final.
Austin Development Services Department (DSD)
Phone: (512) 978-4000 · Verified July 6, 2026 · Source
Website: https://www.austintexas.gov/development-services
Online Permits: https://abc.austintexas.gov/
Frequently Asked Questions
Can I build an ADU on my Austin property?
Yes. Austin allows secondary apartments (ADUs) on most residential lots. The unit can be up to 1,100 sqft or 0.15 FAR of lot area. No owner-occupancy requirement. With Austin's HOME Ordinance (2023), you can have up to 3 total units on most SF-zoned lots. Impervious cover limits and tree protection requirements may constrain placement.
What is the HOME Ordinance and how does it affect my property?
Austin's HOME (Home Options for Middle-Income Empowerment) Ordinance, passed in 2023 (Phase 1) and expanded in 2024 (Phase 2), allows up to 3 residential units on any single-family zoned lot in Austin. This means you can have a main house, an ADU, and a third unit — or a duplex plus a secondary apartment. Minimum lot size requirements were reduced and in some cases eliminated. This is one of the most significant zoning reforms in Austin's history.
Do I need a permit to remove a tree in Austin?
It depends on size. Trees with trunk diameters of 8 inches or more at 4.5 feet height (DBH) are 'Protected Trees' requiring an Austin permit to remove. Trees 19 inches or larger are 'Heritage Trees' — these cannot be removed except in cases of imminent public hazard (with variance approval). Austin's tree ordinance is one of the strictest in Texas and violations can result in significant fines.
Are short-term rentals (Airbnb) allowed in Austin?
Yes, with a license ($613/year). Austin has two STR types: Type 1 (owner-occupied) allows whole-unit rental without the owner present; Type 2 (non-owner-occupied) is limited to 3% of residential units per City Council district and banned in some areas. Austin collects a 9% Hotel Occupancy Tax (HOT) on STR rentals. Noise ordinance and maximum occupancy rules apply.
What are the impervious cover limits in Austin?
Impervious cover limits in Austin depend on your watershed zone and zoning district. Most SF zones allow 45% impervious cover on lots not in critical watershed areas. However, if your property is in the Barton Springs zone or other sensitive watersheds, limits drop to 25-40%. Impervious cover includes your house, garage, driveway, patio, pool, and any other hard surface. Austin Watershed Protection calculates this for each permit application.
Source: Austin Development Services Department (DSD) — Building Regulations. Last verified April 3, 2026. View source