Attic Insulation Cost (2026 Guide)
What determines attic insulation cost, and how to plan the project.
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What drives the price
Cost depends on the area to cover, target R-value, existing insulation removal, air sealing, ventilation work and material choice (blown-in fiberglass/cellulose, spray foam, batts). Air sealing before insulating usually matters more than the insulation itself.
FAQ
What drives attic insulation cost?
Square footage, target R-value, whether old insulation must be removed, air sealing and the material you choose.
Blown-in or spray foam?
Blown-in is usually cheaper; spray foam costs more but can seal and insulate in one step.
Are there rebates?
Many utilities and states offer insulation rebates; check your utility's efficiency program before booking.