How Much Does It Cost to Insulate a House?

Cost by insulation type

Installed cost varies by material:

• Blown-in (cellulose or fiberglass): $1 to $2.50 per sq ft
• Fiberglass batts: $1 to $2 per sq ft
• Spray foam: $3 to $7 per sq ft (highest R-value)

Best value first

Attic insulation is usually the cheapest, fastest, and highest-return insulation project, since most heat is lost through the roof. Sealing air leaks first makes any insulation work better.