Austin calls them additional dwelling units. The HOME Amendments changed which lots can add units. California state law does not apply here.[1]
| Size limits | The city page says the allowed size depends on the zoning district and location; we did not find one citywide number to quote.[1] |
|---|---|
| Height | Not verified. We did not find this on the official pages we checked. Ask the city before you design. |
| Setbacks | Not verified. We did not find this on the official pages we checked. Ask the city before you design. |
| Parking | Not verified. We did not find this on the official pages we checked. Ask the city before you design. |
| Owner occupancy | Not verified. We did not find this on the official pages we checked. Ask the city before you design. |
| Permit steps and timeline | The city page lists SF-1, SF-2 or SF-3 zoning and a lot of at least 5,750 sq ft. Steps: open an Austin Build + Connect account, apply, pay invoiced plan review fees, get approval, pay permit fees, pass inspections and get a Certificate of Occupancy.[1] |
| Fees | Plan review fees are set at submission and permit fees at approval, from the city's Residential Building Plan Review and Permit Fee chart.[1] |
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Sources
Every fact above links to an official city or state page. Rules change; check the source before you build.
- [1] City of Austin: Additional Dwelling Units checked Oct 2026
- [2] City of Austin: HOME Amendments checked Oct 2026