Garage Conversion to Living Space: Utah Cost Guide (2026)
May 13, 2026
In plain English
Converting your garage into living space is one of the fastest, cheapest ways to add square footage in Utah. A two-car garage typically becomes 400–600 sq ft of finished space for $45,000 to $130,000 depending on use.
Cost by use
| Final use | Typical cost | Timeline |
|---|---|---|
| Family room / office | $45k – $75k | 6–10 weeks |
| Gym / studio | $40k – $65k | 5–8 weeks |
| Bedroom + closet | $55k – $90k | 8–12 weeks |
| ADU with kitchen + bath | $90k – $160k | 12–18 weeks |
| In-law suite | $85k – $145k | 12–16 weeks |
Heads up: if you convert your garage, you typically lose covered parking. Many Utah cities require you to add equivalent parking elsewhere on the lot.
What's involved
| Step | What it costs |
|---|---|
| Insulating walls (currently uninsulated) | $4k – $9k |
| Insulating ceiling/roof | $3k – $7k |
| Replacing concrete floor with framed/insulated | $6k – $14k |
| HVAC extension or mini-split | $4k – $10k |
| Electrical upgrade | $3k – $8k |
| Replacing garage door with wall + window | $4k – $9k |
| Drywall, paint, trim | $5k – $12k |
| Flooring | $3k – $9k |
| Plumbing (if bath/kitchen) | $8k – $25k |
| Permits | $400 – $2,000 |
Code requirements you can't skip
Utah's adopted IRC 2021 requires garage conversions to meet full residential standards:
- Insulation: R-15 walls, R-49 ceiling minimum
- Floor: insulated to prevent cold transfer (rigid foam under new subfloor)
- Egress: any sleeping room needs a window meeting egress dimensions
- Heat: permanent heat source (mini-split is most popular)
- Smoke + CO detectors: wired in
- Energy code: 2021 IECC compliance
Warning: unpermitted garage conversions are a major problem at resale. Buyers' lenders often refuse to count unpermitted square footage.
Best uses by ROI
| Use | ROI at resale | Daily value |
|---|---|---|
| Permitted ADU | High | Very high (rental income) |
| Master suite | Medium-high | Very high |
| Permitted bedroom | Medium | High |
| Home office | Low | Very high |
| Gym | Low | Very high |
| Unpermitted "bonus room" | Negative | Medium |
Permitting in major Utah cities
| City | ADU-friendly | Notes |
|---|---|---|
| Salt Lake City | Yes | Internal ADU permitted by-right |
| Sandy | Yes | Some lot size minimums |
| Provo | Yes | Owner-occupancy required for ADU |
| Park City | Restricted | Historic overlays in Old Town |
| Lehi | Yes | Streamlined process |
| Ogden | Yes | Encouraging conversions |
Pros vs. cons
Pros
- Fastest way to add 400–600 sq ft
- Foundation already exists
- Lower cost than new construction
- Can dramatically increase home value (if permitted)
Cons
- Lose covered parking
- May reduce curb appeal if poorly done
- Cold floor unless properly insulated
- Some HOAs prohibit it
FAQ
Can I keep the garage door for the look?
Technically yes — some conversions keep a non-functional door for aesthetic. Better: replace with a large window or French doors that match the home's style.
Does it lower home value?
Permitted, well-done conversions raise value. Unpermitted, low-quality conversions lower it. Always pull permits.
Do I need a separate entrance?
For an ADU, yes. For a bedroom or family room, no.
Can I convert just half the garage?
Yes — a "tandem" conversion that keeps one bay for parking and converts the other is common. Costs $35k–$65k typically.