Spray Foam Insulation Cost Calculator

When it comes to planning a spray foam project, one of the top questions we get is: how much will it cost? While we don’t offer a digital calculator, we can walk you through a realistic breakdown of spray foam insulation cost per square foot. It’s the next best thing to plugging numbers into a tool—and it reflects what homeowners in Indiana can actually expect to pay. 

Step 1: Determine the Area You’re Insulating 

Most homes have multiple insulation zones, such as attics, crawl spaces, walls or garages. Start by measuring the square footage of each area. For example, insulating a 1,000 sq. ft. attic will cost differently than 500 sq. ft. of exterior wall. 

Step 2: Choose Open or Closed-Cell Spray Foam 

Open cell spray foam generally costs between $0.45–$0.75 per board foot. Closed-cell spray foam runs higher, often $1.00–$2.00 per board foot. A board foot is a volume measurement: one square foot at one inch thick. These prices typically include material and installation. Closed-cell offers a higher R-value and also strengthens the building envelope. 

Step 3: Estimate Required Thickness 

Attics and walls typically require 3 to 5 inches of spray foam. Multiply your square footage by the desired thickness in inches, then multiply that number by the cost per board foot. For instance, 1,000 sq. ft. of closed-cell foam at 3 inches would be 3,000 board feet. At $1.25 per board foot, you’re looking at $3,750. 

Step 4: Consider Code Compliance and Extras 

Insulation must meet state and national building codes such as the 2021 IRC, IBC building code and the international residential code. These codes often require specific R-values or fire retardant coatings. A thermal barrier may be required in certain areas, such as garages, crawl spaces or attics that are accessible or occupied. This can add cost, depending on the type of coating and installation complexity. 

Step 5: Total Project Range 

Including materials and standard installation, total spray foam insulation cost usually lands between $1.50 to $4.00 per sq. ft. Open-cell is on the lower end; closed-cell foam insulation with thick application and added air sealing can be on the higher end. 

Foam insulation is an investment that pays back through energy savings. It also ensures your home meets Indiana spray foam code standards. Whether you’re building new or upgrading a drafty space, proper insulation will help stabilize indoor temperatures and cut utility bills year-round. 

Still unsure what your specific space might cost? We’re happy to provide quotes that account for the layout, climate zone and performance targets of your home. 

Contact us to learn more about cost-effective insulation solutions across Fort Wayne, Carmel, Rossville and surrounding Indiana areas.