There is no single national price for a home addition. Cost depends on size, finishes, structure, site conditions, and local labor markets. What you can do early is set a realistic band and design within it.
Separate construction cost from total project cost
- Construction (hard costs): materials, labor, contractor markup
- Soft costs: design fees, engineering, permits, surveys, testing
- Contingency: typically 10–20% for renovations and additions
- Owner items: appliances, furniture, temporary housing if needed
Why professionals ask for a budget band
A $180k kitchen-and-family-room addition and a $750k two-story wing are different projects. Sharing a range is not locking you in — it is how good teams avoid designing something you cannot build.
What drives cost up (and down)
- Structural complexity (removing walls, multi-story, poor soils)
- Kitchen and bath density vs simple bedrooms
- Exterior matching (windows, roof, cladding)
- Energy code and mechanical upgrades
- Site access, HOA rules, and historic districts
A healthier way to shop
- Write a brief with goals and a budget band.
- Talk to a small set of matched professionals.
- Refine scope together before chasing hard numbers.
- Get contractor pricing when the design is clear enough to price.