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)
| Tier | Cost | Unit |
|---|---|---|
| Low | $950 | whole attic |
| Typical | $2,400 | whole attic |
| High | $5,500 | whole attic |