Cost to spray foam 1500 square feet depends on type of foam, thickness, location, and labor rates, but general estimates are as follows. For open cell spray foam at 3.5 inches thick for 2x4 walls or R-13 to R-20, cost is typically $1.20 to $2.50 per square foot installed, so 1500 square feet would cost $1800 to $3750. For closed cell spray foam at 2 inches thick for R-13 to R-14 with higher R-value per inch and vapor barrier, cost is $2.50 to $4.50 per square foot, so 1500 square feet would cost $3750 to $6750. For attic or roof deck with thicker coverage, such as 5.5 inches open cell for R-20, cost could be $2500 to $5000. For whole house 1500 square foot home including walls and attic, total project cost could be $8000 to $15000 or more depending on area covered. DIY kits reduce labor cost but cost $700 to $1200 per 600 board feet kit, so multiple kits needed. Prices vary by region, contractor, and accessibility.
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