Dallas allows ADUs in single-family zones with reasonable setbacks and size limits. The city is moderately ADU-friendly, with a growing interest in infill housing. Permitting is straightforward but requires close attention to lot coverage limits.
Zoning & Size Requirements [1]
| Allowed Zones | Single-family residential (SF) |
| Max Size (Detached) | 900 sq ft |
| Max Size (Attached) | 700 sq ft |
| Max Size (JADU) | 400 sq ft |
| Max Height | 35 feet |
| Max Units | 1 ADU per lot |
Setback Requirements [1]
| Rear Setback | 15 feet |
| Side Setback | 5 feet |
| Front Setback | 20 feet |
| Parking Required | 1 space per primary unit + 1 for ADU |
| Owner Occupancy | Not required |
| Min Lot Size | 5,500 sq ft |
Permit Process & Fees
| Approval Process | Building permit application |
| Review Timeline | 50-75 days |
| Permit Fees | $2,200-$3,800 |
| Impact Fees | $900-$1,600 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Available for detached ADUs |
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Construction Costs [2][3]
| Average Build Cost | $115,000-$230,000 |
| Cost per Sq Ft | $130-$250 |
| Garage Conversion | $55,000-$135,000 |
| Prefab ADU (Installed) | $80,000-$185,000 |
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Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [4][5]
| Avg Rent (1 Bedroom) | $1,150-$1,700/mo |
| Avg Rent (2 Bedroom) | $1,450-$2,200/mo |
| Short-Term Rental | Not permitted in most areas |
| Est. Annual ROI | 6-8% annual return |
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Recent Law Changes
What's Changed Recently
- Austin ADU ordinance expansion (2026): Larger units allowed on smaller lots
- Houston no-zoning ADU policy updated: Streamlined permitting for garage conversions
- San Antonio ADU pilot program results: 200+ permits issued, program made permanent
- Texas legislature considering statewide ADU preemption bill (HB 2345) for 2026
Tips for Building an ADU in Dallas
- Dallas requires lot coverage analysis; even small lots often qualify for ADUs
- Short-term rental restrictions are strict; plan for long-term tenants
- Tree preservation codes can affect placement; consult arborist early
- Deed restrictions are common in Dallas; check HOA rules before investing
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Accessory Dwelling Units — Dallas City Hall Planning Department — Accessed 2026-02-24
- HomeAdvisor — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Dallas Municipal Code 51A-4.510 — ADU Overlay Municipal Code — Accessed 2026-02-24
- Texas Local Government Code — Land Use Regulations Government Data — Accessed 2026-02-24
Frequently Asked Questions
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