Garage Conversion Cost Calculator
Estimate your garage conversion cost. Choose your conversion type — living room, bedroom, home office, studio, or ADU — and get a full itemised breakdown.
Estimated Garage Conversion Cost
National averages from 2026 pricing data. ADU conversions may require additional permitting and vary significantly by local regulations.
Typical Conversion Costs by Type
| Type | Typical Total Cost |
|---|---|
| Living / family room | $10,000 – $25,000 |
| Bedroom | $12,000 – $30,000 |
| Home office | $8,000 – $20,000 |
| Home gym | $5,000 – $15,000 |
| ADU / studio apartment | $25,000 – $75,000+ |
How Much Does a Garage Conversion Cost in 2026?
A basic garage-to-living-space conversion costs $10,000–$30,000 for a standard double-car garage. Converting to a fully self-contained ADU (Accessory Dwelling Unit) with kitchen and bathroom can cost $25,000–$75,000 or more, but can generate rental income of $1,000–$2,500/month.
Key considerations
- Permits — almost always required. Without one, you may be forced to undo the conversion and could face fines when selling.
- Insulation — garages are typically uninsulated. Adding spray foam or batt insulation is essential for comfort and energy efficiency.
- HVAC — extending your home's existing heating/cooling to the converted space costs $1,500–$5,000.
- ADU rental income — many homeowners recoup the conversion cost within 3–5 years through rental income.