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Home Addition Cost Calculator
Estimate what it costs to add square footage to your home — by room type, size, and finish level
Home Addition Estimate
Foundation
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Framing & Roofing
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Plumbing & Electrical
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HVAC
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Interior Finish
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Permits & Architecture
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Cost per Sq Ft
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Est. Timeline
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Estimated Total Cost
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Note: Home addition costs vary widely by region, lot conditions, and
local building codes. Second-story additions require structural engineering review.
Budget 10-15% contingency for unexpected issues (old wiring, foundation work, etc.).
Always get licensed contractor bids and confirm permit requirements with your local
building department.
Construction Project Budget
Plan the full project scope
Estimating a full project?
Most contractors working on your home addition estimate is ready also calculate: