Attic Insulation Cost Calculator
Estimate the cost of insulating your attic based on size, material type, and target R-value.
Last updated: March 25, 2026
Attic Insulation Cost Calculator
Estimate the cost of insulating your attic based on size, material type, and target R-value.
Estimated Total
$2,100
Itemized Breakdown
This calculator provides estimates based on national averages adjusted for your region. Actual costs may vary significantly based on specific project conditions, contractor availability, material prices, and local market factors. Always get at least 3 quotes from licensed, insured contractors before starting your project.
Want the full picture?
Read our complete Attic Insulation cost guide with material comparisons, contractor tips, savings strategies, and regional pricing data.
Quick Cost Reference
Cost by Tier
Blown-in fiberglass over existing insulation (top-up to R-38), 1,000 sq ft attic, basic air sealing
Blown-in cellulose to R-49, 1,200 sq ft attic, comprehensive air sealing of gaps, can lights, and penetrations
Spray foam on attic roof deck (creating conditioned attic), R-38 to R-49, 1,200 sq ft, full air sealing, with baffles and ventilation work