How much does spray foam insulation cost per square foot?

Spray foam insulation is priced per square foot only after an on-site assessment, because final cost depends on material choice, performance goals, and installation conditions. The largest price swings usually come from the material spec needed to reach your comfort and efficiency targets. In many retrofits, careful setup for ventilation and protecting mechanicals adds more labor time than the foam itself. If you’re comparing options, blown-in attic insulation can meet budget-focused goals, while spray foam is chosen when superior air sealing in tight cavities matters. Our technicians work throughout the Roanoke–Salem area and can provide a firm quote after a quick attic and duct review.

Key factors that set the per‑square‑foot price:

• Open-cell vs closed-cell foam selection
• Target R‑value and required thickness
• Area size, layout, and access height
• Prep needs such as air sealing, baffles, or removing old insulation

Schedule an evaluation so we can confirm scope, advise on foam type, and give a clear per‑square‑foot price before work begins.

Updated: 2026-02-25

Need help in Salem, VA? Call (540) 238-0320 or book online. “Installed blown in insulation in my attic. Were very professional, knowledgeable and friendly.” — Dave W.