How much does attic insulation cost?
Attic insulation installation runs $950 for a basic blown-in cellulose top-up, $2,400 for a typical R-49 blown-in install with air sealing, and $5,500+ for spray-foam or full attic encapsulation projects.
Quick price points (2026)
| Scope | Cost | What it includes |
|---|---|---|
| Low | $950 | whole attic |
| Typical | $2,400 | whole attic |
| High | $5,500 | whole attic |
How to budget for this project
- Get 3 quotes
Get itemized quotes from at least three licensed contractors in your area.
- Adjust for your region
Compare the same scope and account for regional labor and permitting.
- Add 10–15% contingency
Hidden conditions, code upgrades and permit fees can increase the original quote.
- Plan the cash, not the financing
Build the replacement cost into the home's repair plan before the work becomes an emergency.