How much does spray foam insulation cost?

Thinking about upgrading your insulation to spray foam but not sure what to expect cost-wise? You’re not alone.

Spray foam insulation is known for its high performance and long-term energy savings—but how much does it actually cost to install? In this post, we’ll break it down so you know what to expect when budgeting for your project.

Average Cost of Spray Foam Insulation

Spray foam insulation costs typically range between $1.00 to $3.50 per board foot, depending on the type of foam, project size, and location.

Here’s a breakdown:

• Open-cell spray foam: $0.44 to $0.65 per board foot

• Closed-cell spray foam: $1.00 to $2.00+ per board foot

Board foot is a unit of measure for volume. One board foot = 12” x 12” x 1”. So for a wall that’s 100 square feet and insulated 3 inches deep, that would be 300 board feet.

Factors That Affect Spray Foam Pricing

1. Type of Foam

• Open-cell: Less expensive, great for interior walls and soundproofing.

• Closed-cell: Higher R-value, moisture resistant, great for roofs, basements, and crawl spaces.

2. Depth of Application

The thicker the foam, the more material used—which means higher cost. Closed-cell is typically sprayed at 2” thick for exterior applications.

3. Size of the Job

Larger jobs often cost less per square foot due to economies of scale. Small, detailed projects may require more prep and labor.

4. Accessibility

Tight crawl spaces, high ceilings, or areas that require special equipment can affect costs.

Keep in mind—while spray foam may cost more upfront than fiberglass or cellulose, it pays for itself through energy savings, durability, and added property value.

Is It Worth the Investment?

Absolutely. Spray foam acts as insulation, air sealant, and moisture barrier all in one. It dramatically cuts heating and cooling costs, improves indoor air quality, and lasts for decades. Most homeowners see a return on investment within 3–5 years through lower utility bills alone.

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Want a Quick, Custom Estimate?

At Mrs. Spray Foam, we make it easy, contact us directly for a free quote tailored to your space and needs.

Let’s get you insulated, efficient, and saving money—fast.

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