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Estimate what it costs to insulate an attic with blown-in fiberglass or cellulose, batts or spray foam, to the R-value you want.
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Attic floor area times the installed price per square foot of the insulation you choose (materials and labor), scaled for the R-value you want, plus removal of old insulation if you need it, adjusted to your state's price level. The published prices are treated as reaching R-38, a common attic target; other R-values scale the price in proportion to the R-value (R-49 needs about 29% more material than R-38). Where a source gives only a range, typical is its midpoint.
Price level by state
How prices in each state compare with the US average (2024, all items): from about 13% below it in Arkansas and Mississippi to about 10% above it in California, Hawaii and DC. Used to adjust home-project cost estimates to your state.
Source: U.S. Bureau of Economic Analysis: Regional Price Parities by state, 2024 (via FRED) · checked October 15, 2026
Estimates for planning, not professional advice. What changed and when →
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