Garage Conversion Cost in 2026: What to Expect

Cost range

A basic 400 sq ft garage-to-bedroom conversion runs $18,000–$35,000. Add a bathroom and it climbs to $45,000–$70,000. A full ADU conversion (kitchen + bath + separate entrance) hits $85,000–$140,000.

The technical checklist

• Raise the slab or build a subfloor (garage floors slope for drainage)
• Insulate walls (R-15) and ceiling (R-38)
• Replace the garage door with framed wall + window
• Extend HVAC or add a mini-split ($3,500–$5,500)
• New electrical circuits for outlets, lighting, HVAC
• Egress window if used as a bedroom

The resale question

In markets tight on housing (CA, WA, MA), garage conversions add value. In suburban markets where buyers want covered parking, they can subtract 3–7% from list price. Check comps before you decide.