A garage conversion in San Antonio typically costs $20,000 to $60,000, depending on whether you're creating a simple bonus room or a fully permitted accessory dwelling unit (ADU) with a kitchen and bathroom. Converting a garage is one of the most cost-effective ways to add living space in San Antonio because the foundation, walls, and roof already exist. Here's what to know about rules, permits, and cost in 2026.
Garage Conversion Cost in San Antonio (2026)
| Conversion Type | Typical Cost |
|---|---|
| Bonus room / office (no plumbing) | $20,000 – $32,000 |
| Bedroom + closet (with HVAC) | $28,000 – $42,000 |
| Studio ADU (kitchenette + bath) | $40,000 – $60,000 |
| Full ADU with separate entry | $55,000 – $90,000 |
What's Involved
A code-compliant conversion is more than drywall over the garage door opening. It generally includes:
- Insulation and framing to meet Texas energy code (IECC)
- HVAC — extending ductwork or adding a mini-split
- Electrical — added circuits, outlets, and lighting by a licensed electrician
- Plumbing — only if you add a bath or kitchenette
- Egress — code-compliant windows for any bedroom
- Flooring over the sloped garage slab (often leveled first)
ADU and Permit Rules in San Antonio
San Antonio's Unified Development Code permits accessory dwelling units in many residential zones, subject to size limits, setbacks, and parking rules. A garage conversion to an ADU requires a building permit — plus electrical, mechanical, and plumbing permits where applicable — through the City of San Antonio Development Services Department. Confirm zoning and ADU specifics for your lot at sanantonio.gov. Removing a garage may also affect required off-street parking, so verify before you start.
HOA Considerations
Many San Antonio neighborhoods — particularly newer communities in Stone Oak, Schertz, and Cibolo — have HOA rules that restrict converting a garage or altering the street-facing facade. Get HOA approval before applying for city permits.
Why Use a Veteran-Owned General Contractor
A garage conversion or ADU coordinates framing, insulation, HVAC, electrical, plumbing, and finishes — plus multiple permits. As a veteran-owned general contractor, 214 Veteran Solutions manages all of it under one contract using qualified, licensed Texas trade subcontractors. We serve San Antonio, Boerne, Helotes, New Braunfels, and surrounding areas.
Frequently Asked Questions
Do I need a permit to convert a garage in San Antonio?
Yes. A garage conversion requires a building permit through the City of San Antonio Development Services Department, plus electrical, mechanical, and plumbing permits where applicable. Converting to an ADU also has zoning, setback, and parking requirements.
How much does a garage conversion cost in San Antonio?
Expect $20,000–$32,000 for a bonus room without plumbing, $28,000–$42,000 for a bedroom with HVAC, and $40,000–$60,000 for a studio ADU with a kitchenette and bath.
Can I build an ADU from my garage in San Antonio?
Often yes. San Antonio's Unified Development Code allows accessory dwelling units in many residential zones, subject to size, setback, and parking rules. Verify zoning for your specific lot with City Development Services before starting.