Spray Foam Insulation Cost Per Square Foot: 2026 Price Chart & Guide
Category: Cost Guides / Pricing
The most common question homeowners ask heading into 2026 is: "What is the current cost of spray foam insulation per square foot?"
As material costs and labor rates shift, staying updated is crucial. Contractors typically quote by the "Board Foot" (volume) rather than just surface area.
In this updated guide, we provide a definitive 2026 Price Chart to help you budget for your insulation needs, from attic retrofits to new metal building projects.
The 2026 Spray Foam Price Chart
Here is the average installed cost (Material + Labor) in the US for 2026. These figures represent the cost per board foot (12" x 12" x 1" thick).
| Insulation Type | Installed Price per Board Foot | Best Use Case | | :--- | :--- | :--- | | Open Cell | $0.55 - $0.85 | Attics, Interior Walls, Soundproofing | | Closed Cell | $1.25 - $2.10 | Metal Buildings, Crawl Spaces, Exterior Walls |
Calculating Your 2026 Investment
To estimate your cost, remember the core formula:
Area (Sq Ft) x Thickness (Inches) = Board Feet
For example, a 1,500 sq ft attic needing 10 inches of Open Cell foam (R-38) involves 15,000 Board Feet. In 2026, this project might range from $8,250 to $12,750 depending on regional labor rates and accessibility.
Use our 2026 Spray Foam Calculator for a precise estimate
Why Costs Changed in 2026
- Material Supply: Chemical prices for poly-iso components have seen moderate shifts.
- Labor Demand: Increased emphasis on energy efficiency in new building codes has pushed demand for certified installers.
- Fuel and Logistics: Transportation costs for heavy rigs continue to influence trip charges.
Choosing Between Open and Closed Cell
Open Cell (The Value Choice)
- 2026 Avg. Installed: $0.55 - $0.85 / bd ft.
- Pros: Exceptional air sealing, great for sound, lower cost.
- Cons: Not a vapor barrier, lower R-value per inch (~3.7).
Closed Cell (The High Performance Choice)
- 2026 Avg. Installed: $1.25 - $2.10 / bd ft.
- Pros: High R-value (~7.0/inch), adds structural strength, acts as a vapor barrier.
- Cons: Higher initial investment.
2026 Installation Minimums
Most reputable contractors in 2026 carry a minimum trip charge of $2,500 - $3,500. Small "one-wall" projects are often billed at this flat rate regardless of the board footage.
Ready to get started? Don't rely on ballpark figures. Your home's unique footprint determines the final price.