Insulation Cost Calculator

A quick estimate based on real installed prices from the 2026 Insulation Cost Guide and DOE regional cost multipliers. For a firm number, get free quotes from a local contractor below.

Includes air sealing and typical R-49 blown cellulose or fiberglass.

Estimated installed range
$1,500–$4,150
After ~$225 federal tax credit: $1,275–$3,925

Estimate only. Actual quotes vary with attic access, existing insulation condition, removal needs, and local labor rates. Regional multiplier applied: 1×.

Attic blown-in to details →Stack more rebates →

How the estimate is built

  • Installed cost ranges come from the 2026 Insulation Cost Guide (real contractor quotes across the U.S.).
  • Regional multipliers reflect labor and material cost differences across five U.S. regions.
  • The federal 25C credit is capped at 30% of materials, up to $1,200 per year — we approximate materials at ~50% of the low quote.
  • State and utility rebates are not included in the calculator — most homeowners stack another $200–$1,750 on top. See the rebate directory.

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