Blown in insulation is one of the most common ways to insulate the attic, crawle or walls of a home. The average cost is about $,, with most homeowners spending between $ and $,, but this is dependent on whether the work is done by the homeowner or by a professional..The cost to Insulate Your Home starts at $. $. per square foot, but can vary significantly with site conditions and options. Get fair costs for your SPECIFIC project requirements. See typical tasks and time to insulate your home, along with per unit costs and material requirements..Finished exterior ” walls with no insulation cellulose insulation will be blown in to empty ” deep wood frame wall resulting in R insulation rating suitable to moderate climate region for a typical single story home of , sq. ft. floor area..Estimate your Spray Foam Insulation Cost This easy calculator shows you how much foam you need, how much you’ll save, and which kits are right for you..