Attic Insulation Cost Calculator (2026)

Estimate the installed cost of attic insulation by area, material, R-value and state — then request local installer pricing.

What drives the price

Installed cost per square foot is roughly $1.50–$3.50 for blown-in fiberglass, $1.70–$3.80 for cellulose, $3–$5.50 for open-cell spray foam, $4.50–$7.50 for closed-cell foam, and $1.20–$2.80 for batts. Air sealing before insulating, removing contaminated or compressed old material, and reaching higher R-values all add cost.

Cost by state

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming District of Columbia

FAQ

How much does attic insulation cost?

For a 1,000 sq ft attic: blown-in fiberglass runs $1,500–$3,500; cellulose $1,700–$3,800; fiberglass batts $1,200–$2,800; spray foam $3,000–$7,500 installed.

What R-value do I need?

Most U.S. climates call for R-38 to R-60 in the attic. Your state energy code and utility rebate program specify the target for your ZIP code.

Is removing old insulation required?

Not always. If the old insulation is wet, contaminated or compressed, removal ($1–$2 per sq ft) is usually recommended before adding new material.

Does air sealing matter more than insulation?

Often yes: sealing gaps around lights, fans and top plates before insulating is the highest-return part of an attic project.

How we make money: this site is free. When you request local pricing we may share your request with licensed local providers and may receive a referral fee. Consent is optional and never required to see an estimate.