Home Addition Cost Calculator
Get an instant estimate for your home addition. Adjust size, materials, foundation type, and region to see a personalized cost breakdown.
Home Addition Cost Calculator
Estimate the cost of adding square footage to your home based on size, materials, and foundation type.
Estimate Breakdown:
Base: $37,000 | Range: $27,750 – $49,950
*Permits, architectural fees, and utility connections not included.
How to Use This Calculator
- Enter your addition size in square feet.
- Select your material quality tier.
- Choose your foundation type.
- Select your region for localized labor costs.
- Review your personalized low/average/high estimate.
Frequently Asked Questions
How accurate is this home addition calculator?
Our calculator provides estimates based on national averages. Actual costs may vary by 25–35% depending on your contractor, architectural complexity, and local permitting costs.
Does the estimate include architectural fees?
No. Our estimate covers construction costs only. Architect or designer fees typically add 5–15% of the construction budget.
Do I need a permit for a home addition?
Yes. Virtually all structural additions require a building permit. Budget $500–$3,000 for permits depending on your municipality and project scope.