What Does Spray Foam Insulation Cost?
Professional spray foam insulation installation typically costs $2,500 to $8,000 for a single-area job such as an attic or crawl space, averaging around $4,500. Whole-house spray foam runs $3,000 to $14,000. The price depends on the foam type, coverage area, and installed thickness.
Open-Cell Spray Foam: $1.50 to $3.50 per Square Foot Installed
Open-cell spray foam is the more affordable option. At $1.50 to $3.50 per square foot installed (material and labor), a 1,000-square-foot attic costs $1,500 to $3,500 in open-cell foam. Bulk foam material on its own runs $0.20 to $0.60 per board foot (one square foot at one inch thick), so material is only a fraction of an installed price and quoting the material rate alone understates a job badly. Open-cell is appropriate for interior applications where moisture resistance is not required. (For more on this, see What Affects Spray Foam Insulation Cost?.)
Closed-Cell Spray Foam: $1.75 to $7.00 per Square Foot Installed
Closed-cell foam costs roughly twice as much per square foot as open-cell. At $1.75 to $7.00 per square foot installed, that same 1,000-square-foot attic runs $2,800 to $4,200 in a lower-cost market, and contractor quotes for attic spray foam in an existing home reach $5,900 to $12,000 at the high end. Closed-cell is required for moisture-exposed surfaces (basement walls, crawlspaces, rim joists) and for applications requiring a vapor retarder.
Labor: $50 to $100 per Hour
Spray foam application labor runs $50 to $100 per hour for experienced applicators, and that labor is already included in the installed per-square-foot rates above. The application itself is fast a skilled crew applies spray foam quickly once the proportioner equipment is running. Setup, masking, and cleanup account for a significant portion of the labor time. For small projects, the setup and mobilization cost makes the effective per-square-foot rate higher than for large projects: contractor-quoted crawl space projects start around $1,800 and attic projects around $2,500 even when the sprayed area is small. (For more on this, see How Long Does Spray Foam Insulation Last?.)
Spray Foam Insulation Cost at a Glance
| Cost Factor | Typical Range | Notes |
|---|---|---|
| Open-cell foam | $1.50 to $3.50 per square foot installed | , lighter and more affordable |
| Closed-cell foam | $1.75 to $7.00 per square foot installed | , denser with better insulation and moisture resistance |
| Labor | $50 to $100 per hour | for experienced application; already included in the installed rates above |
| Overall range | $2,500 to $8,000, averaging $4,500 | single area (attic or crawl space); $3,000 to $14,000 whole house |
Cost figures on this page were checked against published pricing on August 22, 2026. How we source cost data.
Planning Your Project Budget
The cost ranges in this article are based on industry data and are intended as planning benchmarks, not fixed prices. The actual cost for your project depends on your specific home, your local labor market, the current price of materials, and the scope the contractor confirms after a site inspection.
Always get at least two written quotes on equivalent defined scope before committing to any home services project. Wide price variation between quotes usually reflects differences in material quality, scope completeness (what is included and what is not), or contractor overhead and experience level rather than simple price competition.
Use the cost data in this article to ask better questions during the quoting process: What material is included? What does that per-square-foot or per-linear-foot rate include and exclude? Are permits, cleanup, and disposal included? What is the warranty on labor? These questions turn a quote into a comparable basis for decision-making.
Working With a Contractor on This Project
Getting the right outcome on any home services project starts before the work begins. A few consistent practices make the difference between a smooth project and a frustrating one.
Get at least two or three quotes. A single quote gives you no basis for comparison. Two or three quotes reveal the market rate for the work, expose scope differences between bidders, and let you assess contractor communication quality before any commitment is made. The lowest bid is not automatically the best value if the scope is thin or the materials are underspecified.
Ask for licenses and insurance before work starts. Verify current general liability insurance and, for any work involving workers on your property, workers compensation coverage. Licensing requirements vary by state and trade; confirm the specific requirements in your jurisdiction. A licensed contractor who carries appropriate insurance protects both parties if something goes wrong during the project.
Get the scope in writing. A written proposal that specifies materials, labor scope, timeline, what is included (permits, cleanup, disposal), and warranty terms is the foundation of a professional engagement. Verbal agreements on any of these points invite misunderstanding. For any project over $500, written scope is non-negotiable.
Clarify the payment schedule upfront. A reasonable payment schedule ties major payments to project milestones: a deposit at signing, a payment at material delivery or project start, and a final payment at completion after a walkthrough confirms satisfaction. A contractor who requires full payment upfront before work begins is a red flag in any trade.
