🏠

Home Addition Cost

Result
total cost
Per Sq Ft
Permits

How to Calculate Addition Cost

Use this free addition cost calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

Related Calculators

▸ Basement Finish Cost▸ Basement Finishing Cost▸ Bathroom Remodel Cost▸ Broom Finish Cost▸ Composite Deck Cost▸ Concrete Cost