Is it cheaper to do spray foam yourself?

Doing spray foam yourself can be cheaper in terms of labor cost, but not always cheaper overall when considering material cost, equipment, learning curve, and risk of mistakes. DIY spray foam kits cost $350 to $1200 per kit covering 200 to 600 board feet, and for larger area you need multiple kits, so material cost may be similar to professional material cost. Professional installation includes labor, insurance, equipment, and warranty, costing $1.20 to $4.50 per square foot installed. DIY saves labor, potentially saving 30 to 50 percent, but requires careful preparation, protective gear, and skill to achieve even coverage and correct thickness without gaps or overspray. Improper mixing or application can cause poor insulation performance, off gassing, or need for costly removal and reapplication. DIY is feasible for small areas like rim joists, crawl spaces, or small attic sections, but for large areas, whole house, or closed cell foam requiring precise ratio, professional installation is recommended for quality and safety. So DIY can be cheaper for small jobs but may not save much for large jobs.