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Spray Foam Insulation Cost The cost of spray foam insulation will depend on the size and type of project you are undertaking. Generally, spray foam insulation can range anywhere from $0.75 to $1.50 per square foot, depending on the thickness of the insulation and the type of foam used. However, if you have an extensive project, the cost can be much higher. For instance, if you are insulating a large commercial building, the cost can range from $2.00 to $4.00 per square foot. For a more detailed cost estimate, it is best to contact a spray foam warehouse.