Cost by addition type
Additions vary widely by type and complexity:
- Bump-out (a few extra feet): $20,000 to $50,000
- Single room addition: $40,000 to $100,000
- Second-story addition: $100,000 to $300,000+
- Sunroom: $25,000 to $80,000
Why additions cost more per square foot
An addition costs more per square foot than a remodel because you build everything new: foundation, framing, roof, siding, windows, plus interior systems and finishes. Kitchens and bathrooms in an addition push the top of the range because of plumbing.
