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 TeamNational 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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Home Addition Cost by State
Costs vary significantly by location. Select your state for localized pricing:
AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming
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