How much does it cost to spray foam for 1,500 square feet?

When it comes to insulating your home, spray foam insulation stands out as one of the most efficient and effective options available today. Whether you're building new or upgrading an older property, many homeowners wonder about the cost of spray foam insulation. How much does it cost to spray foam 1,500 square feet?

Let’s break down the key factors that affect spray foam pricing, what you can expect to pay, and whether it’s worth the investment.

Spray foam insulation is a high-performance material applied as a liquid that quickly expands into a solid foam. It fills gaps, seals cracks, and creates an airtight barrier that improves energy efficiency and indoor comfort.

There are two main types:

Open-cell spray foam: Lighter and more flexible, ideal for interior spaces.

Closed-cell spray foam: Denser and more rigid, providing better insulation and moisture resistance—perfect for exterior applications or areas prone to dampness.

What Affects the Cost of Spray Foam?

The cost to spray foam a 1,500-square-foot space varies depending on a few key factors:

• Type of Spray Foam: Open-cell foam is generally more affordable, while closed-cell provides higher R-value but costs more.
• Application Area: Attics, crawlspaces, walls, and basements all require different amounts of labor and prep.
• Depth of Foam Applied: Insulation is typically measured in “board feet.” Deeper applications (e.g., 2" vs. 4") mean higher costs.
• Accessibility: Hard-to-reach areas may increase labor time.
• Prep and Cleanup: Removing old insulation or preparing the space can add to your total.
• Local Labor Rates: Pricing may vary slightly based on your location and the availability of contractors.

What Is the Average Cost to Spray Foam 1,500 Square Feet?

Spray foam insulation is priced by the board foot (1 square foot of coverage at 1-inch thick). Here’s a rough estimate of what you might expect:

Open-Cell Spray Foam:

• Cost per board foot: $0.50 – $1.25
• Estimated cost for 1,500 sq. ft. at 3” depth: $2,250 – $5,625

Closed-Cell Spray Foam:

• Cost per board foot: $1.00 – $2.00+
• Estimated cost for 1,500 sq. ft. at 2” depth: $3,000 – $6,000+

Keep in mind, this is a general range. The best way to get an accurate quote is to schedule an in-person assessment with a professional insulation contractor.

Because every home is different, the most accurate way to price your project is through an on-site evaluation. A professional insulation contractor will:

• Inspect the space
• Measure accurately
• Recommend open-cell or closed-cell based on your goals
• Provide a detailed breakdown of materials and labor



Avoid contractors who quote without seeing the space—they may underprice the job and surprise you later with added costs.

Is Spray Foam Worth the Cost?

Although the upfront cost of spray foam insulation is higher than fiberglass or cellulose, the long-term benefits often outweigh the investment:

• Lower utility bills due to superior air sealing
• Reduced strain on HVAC systems, extending their lifespan
• Better indoor air quality by reducing outside pollutants and allergens
• Moisture resistance, helping prevent mold growth
• Boost in property value, especially in energy-efficient homes



In many cases, homeowners begin seeing noticeable savings within the first year.

How Does Spray Foam Compare to Other Insulation Options?

Should You DIY or Hire a Pro?

Spray foam kits exist for DIY use, but they’re not ideal for large-scale applications. The installation requires proper protective gear, equipment, and skill to ensure consistent application. Mistakes can lead to poor insulation performance, safety hazards, or structural damage.

For a 1,500-square-foot space, hiring a professional is strongly recommended to ensure the job is done right the first time.

Get a Free Spray Foam Estimate Today!

Ready to improve your home’s efficiency and comfort? At Insulation Pros, we specialize in professional spray foam insulation for homes of all sizes—including 1,500-square-foot spaces and beyond. Our team will guide you through the best options for your home, budget, and energy goals.

Contact us today for a free, no-obligation quote and let’s get your home sealed, insulated, and savings-ready!