Insulation costs $1.00 to $4.50 per square foot. The average cost to insulate a house is $1,600 to $8,000. Insulation material prices are $0.50 to $2.80 per sq. ft.| HomeGuide
Batt and roll insulation costs $0.80 to $2.60 per square foot installed or $1,100 to $3,900, depending on the R-value. A roll of insulation costs $20 to $90.| HomeGuide
The cost to insulate a garage is $0.50 to $3.00 per square foot installed, depending on the size, height, and insulation type.| HomeGuide