HCL

How Much Does a Home Addition Cost? (2026)

A home addition expands your living space by building new rooms onto your existing structure. Options include bump-outs, second-story additions, sunrooms, and in-law suites.

HC
HomeCostLab Team
·Published January 1, 2026·Updated March 1, 2026·Fact-checked

National Average Cost

Low End

$30,000

Average

$80,000

High End

$200,000

Cost Breakdown

Foundation & Framing30% — $24,000
Interior Finishing20% — $16,000
Electrical & Plumbing15% — $12,000
Roofing & Exterior15% — $12,000
Permits & Architect10% — $8,000
HVAC10% — $8,000
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Project Details

Timeline

2–6 months

Permits

Required; architectural plans and engineering may be needed

Best Season

spring

Frequently Asked Questions

Financing

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