How Much Does Insulation Installation Cost? [2026 Data]

Insulation installation costs $1,500–$6,000. Blown-in attic $1,500–$3,500; batt insulation $2–$4 per sq ft; spray foam $2–$7 per sq ft.

R-value and coverage area affect price. Attic is highest impact. Wall insulation in existing homes requires drilling—$2–$4 per sq ft.

Proper ventilation is critical. Air sealing before insulating maximizes results. Rebates may be available for energy upgrades.