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Costs & calculator

Published national cost ranges with their sources, how contractors price by the board foot, and an estimate calculator.

How Much Does Spray Foam Insulation Cost in 2026?
Spray foam insulation costs about $1.50–$5 per treated square foot installed. Compare open- and closed-cell prices, board-foot math and worked estimates.
Read the guide Updated October 19, 2026
Spray Foam Insulation Cost per Square Foot
Spray foam insulation costs about $1.50–$5 per treated square foot installed. Compare open- and closed-cell pricing, thickness math and worked estimates.
Read the guide Updated October 19, 2026
Spray Foam Insulation Cost per Board Foot
Spray foam costs about $0.60–$1.60 per board foot open-cell and $1.30–$3.10 closed-cell, installed. Learn the board-foot formula and compare quotes.
Read the guide Updated October 19, 2026
Spray Foam Insulation Cost Calculator
Free spray foam insulation cost calculator. Enter area, thickness and foam type to estimate board feet, installed cost range and approximate R-value.
Read the guide Updated October 19, 2026
Open Cell Spray Foam Cost: Prices, Thickness & Examples
Open cell spray foam costs about $0.60–$1.60 per board foot installed. Compare wall and attic estimates, thickness, R-value and contractor quotes.
Read the guide Updated October 19, 2026
Closed Cell Spray Foam Cost: Prices, Thickness & Examples
Closed cell spray foam costs about $1.30–$3.10 per board foot installed. See costs by thickness, project size, application and R-value.
Read the guide Updated October 19, 2026
Open Cell vs Closed Cell Spray Foam Cost
Compare open-cell vs closed-cell spray foam costs per board foot, per square foot and at equal R-value, with worked prices and the math behind them.
Read the guide Updated October 19, 2026

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