Spray Foam Insulation Cost: A Complete Breakdown

As spray foam insulation gains popularity among homeowners, builders, and contractors in the UK for its superior insulating properties, energy efficiency, and gap sealing capabilities, it’s crucial to comprehend the spray foam insulation cost when evaluating insulation options for your home or building project.

In this comprehensive guide, we will explore the factors that influence spray foam insulation cost, compare it to traditional insulation, and help you make an informed decision about your insulation needs.

Spray Foam Insulation cost

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How Much Does Spray Foam Insulation Cost UK?

The cost of spray foam insulation in the UK can vary significantly depending on several factors. These factors include the size and complexity of the project, the type of spray foam insulation used, and the specific location and conditions of the building.

Generally, the cost of spray foam insulation can range between £30 and £70 per square metre. However, it is important to note that this is only a rough estimate, and the actual cost can be higher or lower depending on the unique circumstances of each project.

Spray Foam Insulation Cost per SQ Metre UK

The cost of spray foam insulation per square metre in the UK depends on various factors, including the type of spray foam used and the project’s specific requirements. Here’s a breakdown of the approximate costs associated with each type of spray foam insulation:

Open cell spray foam: This type of spray foam is more flexible and lighter in weight, making it a suitable option for residential applications. It provides a great insulation value, but it may not be as effective at moisture resistance compared to closed-cell spray foam. The approximate cost of open-cell spray foam ranges from £30 to £70 per square metre.

Closed cell spray foam: Closed cell spray foam offers a higher insulation value per inch and is more effective at preventing moisture infiltration. It is denser and more rigid than open-cell foam, making it a popular choice for commercial and industrial projects. The cost of closed cell spray foam insulation typically ranges between £20 and £50 per square metre.

Keep in mind that these costs are only approximate figures, as the final cost of spray foam insulation depends on various factors such as the size of the area, building condition, location, environment, and special requirements. Before obtaining an estimate, it’s crucial to arrange a pre-installation survey with a qualified installer like Spray Foam Tech to assess the area that needs insulation and provide a more accurate quote.

Spray Foam Insulation Cost vs Traditional Insulation

When comparing spray foam insulation cost with traditional insulation methods, it is essential to consider not only the upfront costs but also the long-term benefits and potential savings that each option offers. Traditional insulation materials, such as fiberglass, mineral wool, and cellulose, may initially seem less expensive than spray foam insulation. However, when evaluating the overall value, spray foam insulation often proves to be a more cost-effective solution in the long run.

The upfront cost of traditional insulation materials may range between £10 to £30 per square metre. While this may seem more affordable compared to the £30 to £90 per square metre for spray foam insulation, there are several factors to consider that impact the total cost and value of each insulation type:

Energy Efficiency: Spray foam insulation provides superior thermal performance compared to traditional insulation materials. This is mainly due to its ability to create an air barrier, reducing air leakage and drafts, which can lead to significant energy savings. Homeowners and business owners may save up to 50% on their heating and cooling costs with spray foam insulation, while traditional insulation materials typically offer lower energy savings.

Lifespan: Spray foam insulation is known for its durability and long-lasting performance. Once installed, it can maintain its insulating properties for many years without the need for replacement or maintenance. Traditional insulation materials, on the other hand, may settle, sag or degrade over time, requiring replacement or additional insulation to maintain their efficiency.

Pest and Moisture Resistance: Spray foam insulation offers excellent resistance to moisture and pests, which can be crucial factors in maintaining the structural integrity of a building. Traditional insulation materials may absorb moisture or provide a suitable habitat for pests, leading to potential damage and costly repairs.

Ease of Installation: While traditional insulation materials require precise cutting, fitting, and placement, spray foam insulation is easier to install, as it expands to fill gaps, cracks, and crevices, creating a seamless and continuous layer of insulation. This reduces the risk of installation errors and the associated costs of fixing any issues.

Taking all these factors into account, it becomes clear that while spray foam insulation may have a higher upfront cost than traditional insulation methods, it offers greater long-term value due to its superior energy efficiency, durability, and resistance to moisture and pests.

When considering the overall costs and benefits, spray foam insulation can be a more cost-effective solution for homeowners and businesses looking to improve the insulation and energy efficiency of their properties.

Spray Foam Insulation Cost Calculator UK

Calculating the cost of spray foam insulation for your project can be a bit challenging due to the various factors that influence the overall price. However, understanding these factors and how they impact the cost can help you estimate the investment required for your insulation project. Here are some steps to help you calculate the cost of spray foam insulation:

1. Measure the area: Determine the total square footage of the area that requires insulation, such as walls, ceilings, or floors. To do this, measure the length and width of each surface and multiply them to obtain the square footage. Add up the square footage of all surfaces to get the total area to be insulated.

2. Choose the type of spray foam: There are two main types of spray foam insulation – open-cell and closed-cell. Open-cell spray foam has a lower insulation value (R-value) per inch but is generally more affordable, costing around £30-£70 per square metre. Closed-cell spray foam has a higher R-value per inch and offers better moisture resistance, but it is also more expensive, with prices ranging from £50 to £90 per square metre.

3. Estimate the thickness required: The thickness of the spray foam insulation you’ll need depends on the desired R-value, which is a measure of the insulation’s effectiveness in preventing heat transfer. The higher the R-value, the better the insulation. Consult with a professional installer or refer to local building codes and regulations to determine the appropriate R-value and thickness for your project.

4. Calculate the cost: Multiply the total square footage of the area to be insulated by the cost per square metre for the chosen type of spray foam. This will give you an estimated cost for the spray foam insulation materials. Keep in mind that this is just an approximation, as other factors, such as building conditions, location, environment, and special requirements, may influence the final cost.

5. Consider installation costs: In addition to the material costs, you’ll also need to account for the cost of professional installation. Spray foam insulation requires specialised equipment and expertise to ensure proper application and safety. Contact a qualified installer, like Spray Foam Tech, to obtain a detailed quote based on your project’s specifics.

Remember, the spray foam insulation cost can vary depending on several factors, so it is crucial to arrange a pre-installation survey with a qualified installer to assess the area that needs insulation and provide an accurate estimate. To arrange one with Spray Foam Tech, get in touch today.

What’s the Return on Investment from Spray Foam Insulation

The return on investment (ROI) from spray foam insulation can be substantial, as it not only improves a building’s energy efficiency but also offers several additional benefits. Here’s an overview of the factors that contribute to the ROI from spray foam insulation:

Energy savings: Spray foam insulation can deliver up to 50% greater energy savings compared to other insulation products, as it expands to fill gaps and voids, creating an airtight seal. This prevents air leakage, reduces drafts, and maintains a consistent indoor temperature, leading to lower heating and cooling costs. Homeowners and businesses can expect to see a reduction in their energy bills, often recouping the initial investment in insulation within a few years.

Enhanced indoor comfort: A well-insulated building provides a more comfortable living or working environment, with fewer temperature fluctuations and reduced noise transmission from outside. This improved comfort level can contribute to increased productivity in commercial settings and higher satisfaction levels among occupants.

Improved indoor air quality: By sealing gaps and preventing air infiltration, spray foam insulation can also reduce the entry of allergens, pollutants, and moisture into the building. This leads to better indoor air quality, which can benefit occupants’ health and reduce the likelihood of mould growth and associated remediation costs.

Structural integrity: Closed-cell spray foam insulation adds structural strength to a building by providing a rigid layer that helps resist external forces. This can potentially increase the building’s lifespan and reduce repair and maintenance costs.

It’s important to note that the specific ROI from spray foam insulation will depend on factors such as the building’s location, climate, energy costs, and insulation type. However, by considering these benefits and the potential energy savings, it’s clear that investing in spray foam insulation can provide a worthwhile return on investment over time.

DIY Spray Foam Insulation Cost

DIY spray foam insulation kits are available in the market, with prices varying depending on the size and type of kit required. However, it’s important to consider the potential risks and drawbacks of a DIY approach to spray foam insulation.

Installing spray foam insulation requires specific equipment and expertise, and improper installation can lead to suboptimal insulation performance or even damage to the building structure. Additionally, there are safety concerns associated with the chemicals used in spray foam insulation, and improper handling can pose health risks.

Considering these factors, it’s generally recommended to hire a professional spray foam insulation installer to ensure the insulation is applied correctly, safely, and effectively. A professional installation not only guarantees the best results and energy savings but also provides you with peace of mind knowing that your investment is protected.

Frequently Asked Questions about Spray Foam Insulation Costs

Here are some common questions people have about the costs associated with spray foam insulation:

  • How long does spray foam insulation last? Spray foam insulation is a durable and long-lasting insulation option. It can last for the lifetime of a building, which is typically around 50 years or more, as long as it is properly installed and maintained.

  • Can I save money by installing spray foam insulation myself? While DIY spray foam insulation kits are available, the installation process requires specialised equipment and knowledge. Attempting a DIY installation can result in an improper application, leading to reduced performance and potential safety hazards. It is generally recommended to hire a professional installer to ensure the best results.

  • Are there any government grants or incentives for installing spray foam insulation? Depending on your location, there may be government grants or incentives available to help offset the cost of installing spray foam insulation. Be sure to research and apply for any relevant programs in your area.


When considering spray foam insulation for your home or building project, it’s crucial to understand the costs involved and weigh them against the potential long-term benefits and savings.

While the initial cost of spray foam insulation may be higher than traditional insulation options, its superior insulating properties, energy efficiency, and ability to seal gaps can result in significant savings on energy bills and improvements to your living environment.

By understanding the factors that influence spray foam insulation cost and considering the long-term benefits, you can make an informed decision that will enhance your home’s comfort, energy efficiency, and overall value.

Conducting a thorough assessment of your property’s insulation needs and working with a reputable installer, like Spray Foam Tech, will ensure you receive the most accurate cost estimate and the best possible outcome for your project. We are here to help you make the right decision for your insulation needs and provide you with a top-quality, energy-efficient solution.

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