How Much Does Garage Conversion Cost in Illinois?
Illinois pricing is near the national average. Updated for 2026.
Garage Conversion Pricing in Illinois
In Illinois, the average cost for garage conversion is $18,900 per project, which is 5% higher than the national average of $18,000. Most Illinois residents pay between $8,400 and $31,500.
Illinois has costs that track closely with the national average, though prices can still vary between urban and rural areas within the state.
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.
Illinois vs National Average
What Affects Garage Conversion Cost in Illinois?
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 Illinois
- 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 Illinois Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $16,054 | — |
| 2021 | $16,728 | +4.2% |
| 2022 | $17,815 | +6.5% |
| 2023 | $18,314 | +2.8% |
| 2024 | $18,900 | +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 Illinois
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 Illinois
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