Room addition estimator
What will a room addition actually cost?
Estimate the cost of adding a new room to your home based on size, build tier, and region.
PROJECT SIZE300 sq ft
1001000
TIER
ADD-ONS
Estimated cost
$63,750 – $86,250
$0$685,860 max
Foundation & framing$22,500
Exterior finishes$11,250
Interior finishes$18,750
Labor$22,500
Estimate only, based on national contractor pricing data and the inputs above. Actual quotes vary by contractor, materials, and site conditions — use this to plan your budget, not as a bid.