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Understanding the Cost of Foam Insulation Spray: A Comprehensive Guide

When it comes to insulating your home, foam insulation spray is a popular choice due to its excellent thermal performance and ability to seal even the tiniest gaps. However, one of the most common questions homeowners ask is, "What will it cost me?" Let's dive into the various factors that influence the cost of foam insulation spray, helping you make an informed decision for your next home improvement project.

What is Foam Insulation Spray?

Foam insulation spray, commonly known as spray foam insulation, is a versatile material used to insulate and air-seal buildings. It comes in two main types: open-cell and closed-cell foam.

  • Open-cell foam is less dense, more flexible, and provides good thermal resistance and soundproofing capabilities.

  • Closed-cell foam is denser, offers higher R-value per inch, and provides a moisture barrier, making it ideal for areas prone to moisture.

Both types have their specific applications and benefits, impacting the overall cost.

Factors Affecting the Cost

  1. Type of Foam

  • Open-cell foam: Typically costs between £12.00 and £18.00 per square meter.

  • Closed-cell foam: Costs range from £18 to £40 per square meter due to its higher density and insulating properties.

  1. Area Coverage

  • The larger the area to be insulated, the higher the total cost. Prices are often quoted per square meter.

  • For example, insulating a 100 square meters area with 100mm of open-cell foam might cost between £1,200 and £1,800.

  1. Thickness Required

  • The thickness of the insulation required depends on your climate and the specific R-value (a measure of thermal resistance) needed. Thicker applications will increase the cost proportionally.

  1. Labour Costs

  • Professional installation is recommended for spray foam insulation, adding to the cost. Labour charges can vary based on the complexity of the job, region, and installer experience.

  1. Location and Accessibility

  • Hard-to-reach areas or spaces requiring extensive preparation can increase the cost. Additionally, geographic location can influence labour and material costs.

Average Cost Estimates

To give you a rough idea, here are some average cost estimates for different scenarios:

  • Attic Insulation: Insulating an attic of approximately 100 square meters with open-cell foam to a depth of 6 inches might cost between £1,600 and £2,200.

  • Wall Insulation: Insulating 50 square meters of wall space with closed-cell foam at a depth of 75mm (3 inches) might cost between £1,500 and £2,000.

  • Crawl Space Insulation: Insulating a 50 square meters crawl space with closed-cell foam at a depth of 50mm 2 inches could range from £1,000 to £1,500.

Cost vs. Value

While the upfront cost of spray foam insulation can be higher compared to traditional insulation methods (like fiberglass or cellulose), its long-term benefits often justify the investment:

  • Energy Savings: Spray foam creates an airtight seal, reducing energy bills by up to 20-30%.

  • Longevity: It doesn’t sag or settle over time, maintaining its insulating properties for decades.

  • Moisture Barrier: Closed-cell foam provides excellent moisture resistance, reducing the risk of mould and mildew.

  • Soundproofing: Open-cell foam improves sound insulation, making your home quieter.


The cost of foam insulation spray varies based on several factors, including the type of foam, area coverage, thickness, labour, and location. While it may require a higher initial investment, the energy savings, durability, and additional benefits make it a cost-effective choice in the long run.

If you're considering foam insulation spray for your home, consult with a professional installer to get an accurate estimate tailored to your specific needs. Investing in quality insulation can enhance your home's comfort, energy efficiency, and overall value.

By understanding the costs and benefits associated with foam insulation spray, you can make an informed decision that best suits your budget and insulation needs.

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