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.