Garage Conversion Cost Calculator
Estimate the cost of converting your garage into livable space. Whether you're adding a bedroom, home office, or full ADU, get a detailed breakdown of all expenses.
1-car: 200-250 sq ft | 2-car: 400-500 sq ft | 3-car: 600-800 sq ft
Legal bedroom with closet and egress
Enter your garage details to estimate conversion costs.
How It Works
Our garage conversion calculator estimates costs based on your garage size and the type of conversion you're planning. We factor in all major components: structural modifications, insulation, HVAC extension, electrical upgrades, and finishing work.
Basic conversions create functional living space without bedrooms or plumbing. Bedroom conversions require egress windows and closets to meet code. ADU (Accessory Dwelling Unit) conversions include a full kitchen and are designed as independent living spaces.
Converting a garage adds heated square footage to your home, which typically increases home value. However, losing garage space may slightly offset this gain in some markets. Check local regulations—some areas restrict garage conversions or require replacement parking.
Frequently Asked Questions
Do I need a permit for garage conversion?
Yes, almost always. Garage conversions require building permits for structural, electrical, and plumbing work. You may also need planning approval, especially in areas with parking requirements. Working without permits can result in fines and problems when selling.
Can I convert my garage to a legal bedroom?
Yes, but it must meet building code requirements: minimum room size (usually 70 sq ft), ceiling height (7 ft minimum), egress window for emergency escape, closet, and proper heating/cooling. A bedroom also increases your home's bedroom count, which can significantly boost value.
How long does a garage conversion take?
A basic conversion takes 2-3 weeks. Bedroom conversions with bathrooms typically take 4-6 weeks. Full ADU conversions can take 2-3 months. Permit approval adds 2-8 weeks depending on your jurisdiction.
What happens to the garage door opening?
The garage door is removed and the opening is filled with a standard wall including insulation, siding to match your home, and typically a window. Some homeowners keep a modified garage door for flexibility, but this reduces insulation and security.
Is a garage conversion worth it financially?
It depends on your market. In areas with high housing costs, adding living space typically adds value. Losing a garage may reduce value in suburban areas where parking is important. ADUs that can generate rental income often provide the best ROI, sometimes paying for themselves within 5-10 years.