Austin is one of Texas's most ADU-friendly cities, allowing detached ADUs and attached ADUs in many zones. Recent zoning reforms have streamlined the permitting process, making it easier for homeowners to build accessory units.
Zoning & Size Requirements
| Allowed Zones | SF3, SF2, SF1, MU, UR, etc. |
| Max Size (Detached) | 750 sq ft |
| Max Size (Attached) | 750 sq ft |
| Max Size (JADU) | 500 sq ft |
| Max Height | 35 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 10 feet |
| Side Setback | 3 feet (with easement) |
| Front Setback | 20 feet |
| Parking Required | 1 space for primary, optional for ADU |
| Owner Occupancy | Not required |
| Min Lot Size | 5,000 sq ft |
Permit Process & Fees
| Approval Process | Standard building permit application |
| Review Timeline | 45-60 days |
| Permit Fees | $2,500-$4,000 |
| Impact Fees | $1,200-$2,000 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | City offers expedited review for pre-approved plans |
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Construction Costs
| Average Build Cost | $125,000-$250,000 |
| Cost per Sq Ft | $165-$330 |
| Garage Conversion | $60,000-$140,000 |
| Prefab ADU (Installed) | $85,000-$200,000 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| Avg Rent (1 Bedroom) | $1,300-$1,900/mo |
| Avg Rent (2 Bedroom) | $1,700-$2,500/mo |
| Short-Term Rental | Check local restrictions |
| Est. Annual ROI | 7-10% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Streamlined permitting process for detached ADUs
- 2023: Removed owner-occupancy requirement citywide
- 2023: Increased max detached ADU size from 650 to 750 sq ft
- 2024: Expanded ADU allowance to mixed-use zones
Tips for Building an ADU in Austin
- Austin offers free ADU design consultations through the Planning Department
- Consider the tight lot setbacks when placing your ADU on smaller parcels
- Austin's rental market is strong; expect 7-10% ROI on ADU investments
- Many Austin neighborhoods have specific design guidelines; verify early
Frequently Asked Questions
Can I build an ADU in Austin?
Yes. ADUs are allowed in SF3, SF2, SF1, MU, UR, etc. in Austin. The maximum size for a detached ADU is 750 sq ft. No owner-occupancy is required.
How much does an ADU cost in Austin?
ADU construction in Austin typically costs $125,000-$250,000. Garage conversions run $60,000-$140,000, and prefab ADUs cost $85,000-$200,000 (installed).
How much can I rent an ADU for in Austin?
Average ADU rents in Austin are $1,300-$1,900/mo for a 1-bedroom and $1,700-$2,500/mo for a 2-bedroom unit.
Do I need parking for an ADU in Austin?
1 space for primary, optional for ADU. Check with Austin planning department for the latest Texas ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Austin?
The permit review timeline in Austin is 45-60 days. Fees range from $2,500-$4,000.
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