Garage Conversion Cost Calculator

Garage conversion adds living space at a fraction of new construction cost.

Garage sq ft

Per sq ft basic conversion

Kitchenette

Bathroom

Permit fees

Total cost

$50,500

Basic conversion

$22,000

All-in $/sf

$126

How the math works

Basic conversion = sq ft × $/sf. Total = basic + kitchenette + bathroom + permit.

400 × $55 + $12k + $15k + $1.5k = $22k + $28.5k = $50,500 garage conversion.

How to Use

Enter garage sq ft.
Enter per sq ft basic conversion.
Enter kitchenette.
Enter bathroom.
Enter permit fees.
Read total cost.

Frequently Asked Questions

Garage conversion economics?

Basic conversion (insulation, drywall, electric, flooring): $10,000–25,000 for 400 sf garage. Bedroom + closet conversion: $15,000–35,000. Kitchenette add: +$8,000–20,000. Bathroom add: +$8,000–25,000 (plumbing run). Full ADU (legal): $40,000–120,000 (foundation, code, permits). Permit: $300–5,000. Property value impact: $100–300/sf added depending on quality. ROI: 50–80% on cost vs added home value. Considerations: parking ratio in HOA/zoning, exterior appearance match.

How accurate is this estimate?

Material and labor estimates are accurate to ±15% with reasonable inputs but local market conditions vary. Major markets cost 30–60% more than rural. Labor rates regional (union vs non-union, prevailing wage). Material prices fluctuate with commodity cycles. Get 3 contractor bids for any work over $5k. This calculator is a sanity check, not a substitute for actual quotes.

DIY vs contractor?

DIY savings: 40–70% of contractor cost on labor. Realistic skill threshold: painting, basic plumbing, simple electrical, drywall, flooring. Pro required: structural, gas, complex electrical, HVAC, roofing (warranty + insurance), permits. Permitted work without license risks insurance and resale. Time: hobby DIYers 3–5x slower than pro. Tools and learning curve real.

Permit and code compliance?

Permits required for: structural changes, additions, electrical service changes, plumbing rough-in, HVAC replacement, roof replacement (varies), fence (varies). Cost: $50–2,000+ depending on scope. Skipping permit risks: stop work order, fines, forced removal, insurance denial, resale title issues. Always pull permit; cost is small relative to compliance friction.