Houston allows ADUs in most residential zones but requires strict compliance with setbacks and lot coverage limits. The city has fewer restrictions than many metros, but permitting can be complex due to Houston's sprawling geography and multiple utility providers.
Zoning & Size Requirements
| Allowed Zones | SF, MF residential zones |
| Max Size (Detached) | 1,200 sq ft |
| Max Size (Attached) | 800 sq ft |
| Max Size (JADU) | Not commonly allowed |
| Max Height | 35 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 15 feet |
| Side Setback | 5 feet |
| Front Setback | 25 feet |
| Parking Required | 2 spaces per lot |
| Owner Occupancy | Not required |
| Min Lot Size | 7,000 sq ft |
Permit Process & Fees
| Approval Process | Building permit + plumbing/electrical permits |
| Review Timeline | 60-90 days |
| Permit Fees | $3,000-$5,500 |
| Impact Fees | $800-$1,500 |
| Plan Check | 3-4 weeks |
| Pre-Approved Plans | Limited pre-approval program |
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Construction Costs
| Average Build Cost | $120,000-$240,000 |
| Cost per Sq Ft | $100-$200 |
| Garage Conversion | $50,000-$130,000 |
| Prefab ADU (Installed) | $80,000-$190,000 (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) | $1,100-$1,600/mo |
| Avg Rent (2 Bedroom) | $1,400-$2,100/mo |
| Short-Term Rental | Varies by neighborhood |
| Est. Annual ROI | 6-9% 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
- 2023: Increased max detached ADU size from 1,000 to 1,200 sq ft
- 2024: Streamlined utility connections for ADUs
- 2023: Added ADU allowance in townhouse zones
- 2024: Extended parking requirement flexibility for ADU-only units
Tips for Building an ADU in Houston
- Houston's sprawl means utility connections can be complex; budget extra time
- Lot size matters more in Houston than many cities due to setback requirements
- The HOA approval process can add 4-6 weeks; check deed restrictions early
- Consider ground-level ADUs due to hurricane and flooding concerns
Frequently Asked Questions
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