Houston ADU Permits & Requirements
Fees $1,000–$5,000 · 6–12 weeks timeline · Up to 900 sf
Quick Answer
Houston ADUs: $150K–$300K
Permits: $1,000–$5,000 · Updated April 2026
Permit Fees Breakdown
| Fee Type | Cost |
|---|---|
| Building Permit | $1,000–$4,000 |
| Plan Review | $200–$800 |
| Stormwater/Drainage | $500–$2,000 |
| Utility Connections | $500–$2,000 |
Permit Process Timeline
Deed Restriction Check
1–2 weeksCritical: check HOA/deed restrictions before design (Houston has no zoning)
Plan Preparation
2–4 weeksArchitectural plans with flood zone compliance if applicable
Plan Review & Permit
4–6 weeksCity review for building code compliance
Construction
3–6 monthsBuild phase with required inspections
Final Inspection & CO
1–2 weeksFinal inspection and Certificate of Occupancy
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Zoning & Requirements
Max ADU Size
900 sf
Height Limit
25 ft
Setbacks
5 ft side/rear
Parking
1 off-street space (separate from primary)
Key Regulations
- Houston has NO traditional zoning — but deed restrictions may prohibit ADUs. Check your deed first
- Max ADU size: 900 sf in city regulations
- 5 ft minimum setbacks from side and rear property lines
- Stormwater detention may be required in flood-prone areas
- Free pre-approved ADU plans available from the City of Houston ('Double House')
- No owner-occupancy requirement — investor-friendly
Climate & Construction Notes
Houston's extreme humidity, heavy rainfall, and flood risk require elevated foundations, robust drainage systems, and moisture-resistant construction throughout. High-efficiency AC is essential for the 7+ month cooling season.
Frequently Asked Questions
How long does it take to get an ADU permit in Houston?
The typical permit timeline is 6–12 weeks from application to approval. Total project time including design and construction is usually 6–12 months.
What types of ADUs are allowed in Houston?
Houston allows detached, attached, garage conversion. Maximum size is 900 sf with a height limit of 25 ft.
Do I need to live on the property to build an ADU in Houston?
No. Check with Houston's planning department for the most current requirements.
More Houston ADU Resources
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