How Much Does Garage Conversion Cost in Washington?
Washington pricing is above the national average. Updated for 2026.
Garage Conversion Pricing in Washington
In Washington, the average cost for garage conversion is $20,700 per project, which is 15% higher than the national average of $18,000. Most Washington residents pay between $9,200 and $34,500.
Washington has a higher cost of living than most states, which translates to higher labor rates and material costs. Urban areas within Washington may be even higher.
A garage conversion transforms your existing garage into livable space — typically a bedroom, home office, rental unit (ADU), or family room. It's one of the most cost-effective ways to add square footage since the structure already exists.
Washington vs National Average
What Affects Garage Conversion Cost in Washington?
Scope
Basic (insulation, drywall, flooring, electrical): $8,000-$15,000. Full conversion with bathroom: $20,000-$35,000. Full ADU with kitchen: $30,000-$60,000
Foundation
Garage floors may need leveling or moisture barrier: $1,000-$3,000
Permits
Permits and plans: $500-$3,000 depending on city. Some areas restrict garage conversions.
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💡 Tips to Save on Garage Conversion in Washington
- 1.Check local ADU laws — many cities now fast-track garage conversion permits
- 2.Keep the garage door opening and frame it in (saves $2,000-$4,000 vs structural wall)
- 3.Skip the bathroom if it's a home office or playroom to save $5,000-$10,000
- 4.Ductless mini-split AC/heat ($3,000-$5,000) is cheaper than extending existing HVAC
📈 Garage Conversion in Washington Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $17,583 | — |
| 2021 | $18,321 | +4.2% |
| 2022 | $19,512 | +6.5% |
| 2023 | $20,058 | +2.8% |
| 2024 | $20,700 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for Garage Conversion in Washington
Recent Reports
Frequently Asked Questions
Does a garage conversion add home value?
Yes, typically returning 80-130% of the investment. Converting a 2-car garage adds 400-500 sq ft of living space. However, losing garage parking can reduce value in some markets.
Do I need a permit for a garage conversion?
Almost always yes. Converting a garage to living space requires building permits for electrical, plumbing, HVAC, and structural changes. Unpermitted conversions can cause issues when selling.
Garage Conversion Cost in Other States
Related Cost Guides for Washington
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