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blown in

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Illustration of an insulation blower hose puffing loose-fill into an attic joist bay with a depth-marker ruler, in a clean teal and orange style with no text.

Blown-In Insulation Cost per Sq Ft (2026): Cellulose vs Fiberglass by R-Value

Blown-in insulation costs $1.50 to $3.50 per sq ft installed in 2026 ($0.90 to $1.80 DIY). Cellulose vs fiberglass by R-value, attic vs walls, bags needed.

Erin KesslerApr 5, 2026Updated Jun 2, 202615 min read