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Spray Foam Insulation Costs 2022

Installing spray foam insulation

Spray foam is usually the most expensive insulation material

On average, spray foam insulation costs between £20–£50 per square metre

If you’d like to get free spray foam insulation quotes, fill out the form above

The UK housing market has an insulation problem – with roughly two-thirds of homes being rated a D or below in their Energy Performance Certificate (EPC).

These low ratings are causing two major issues across the UK: high carbon emissions and expensive energy bills. These are the key reasons why the government is encouraging homeowners to invest in good-quality insulation, which will also help the country hit its target of being net zero by 2050.

If your home is one of the millions of properties that need better insulation, you’ll be pleased to know that you have a few options – one of the best being spray foam insulation. Want to find out how much it’ll cost you? Check out the article below to find out.  

Better yet, you can find the best deals on spray foam insulation by simply popping a few details in this quick form. Once we have some key information, we’ll put you in touch with our trusted insulation installers, who will provide you with their best insulation deals. You’ll thank yourself when the temperature drops!

Spray foam insulation

How much does spray foam insulation cost?

The National Insulation Association suggests that spray foam insulation would cost around £2,500 for a three-bedroom semi-detached property.

If you’re thinking this is pretty pricey, you’re right. Spray foam is usually more expensive than other types of home insulation, partly because it’s so effective at locking in heat.

According to Which?, spray foam insulation costs £20–£50 per square metre – though this will depend on how thick it is. To give you an idea of how much spray foam insulation will cost for your property, we’ve taken a median price of £35 per square metre, and outlined just how much homeowners would have to pay to insulate different types of properties.

Property typeAverage property size (m²)*Average cost of 100mm-thick spray foam

*Figures from the ONS


Remember that you’ll also have to take labour costs into account, which can vary depending on the amount of work required. 

Most tradespeople will charge a daily rate of around £150–£200 for installing loft insulation. However, the installer might have to carry out additional jobs, such as electrical wire relocation or loft boarding, which will increase the price further.

Want to see how much spray foam insulation will cost you? Pop a few details in this quick form, and our trusted suppliers will be in touch with free quotes for you to compare. 


Although spray foam is the most expensive type of insulation, you certainly get what you pay for. 

The average R value (a calculation to give a value to a material's thermal resistance) of spray foam insulation is between 5.6 and 8 per inch – much higher than other forms of insulation – which means homeowners will quickly make their money back through savings on their monthly energy bills. 

Some studies have shown that spray foam insulation can save you as much as 50% on energy bills when compared to traditional home-insulation products.

The Energy Saving Trust suggests that installing insulation can save homeowners as much as £380 on their energy bills each year – but this will vary according to the type and size of each property. 

In the chart below, we’ve outlined how much you can save by installing insulation depending on the type of property you have.

Data from The Energy Savings Trust


Installing insulation will also help homeowners reduce their carbon footprint – using less energy leads to fewer emissions. But just how much will insulation help your carbon footprint? Check out the chart below to find out:

Spray foam insulation cost per square metre

The overall cost of spray foam insulation can cost between £20–£50 per m², but will depend on the thickness you go for.

To compare, loose-fill insulation costs around £7.50 per m², blanket insulation will set you back roughly £5 per m², and a thermal foil layer will be about £3 per m². 

What factors affect the cost of spray foam insulation?

The cost of spray foam insulation depends on a few things, including the:

  • Size of the property you want to insulate
  • Thickness of the foam
  • Type of insulating spray foam (open or closed cell)
  • Amount of time it takes to install
Installing spray foam insulation

Are there any government grants for spray foam insulation?

The main grant available to Brits looking to insulate their properties is the Energy Company Obligation (ECO). The 2022-2026 scheme, ECO4, began in April 2022. 

Under the ECO4 scheme, a number of obligated energy suppliers work with local companies to install energy efficiency measures, such as loft or wall insulation, in UK homes. Better yet, these energy suppliers fund the installation, which means eligible homeowners won’t have to pay a penny. 

Who’s eligible for the ECO scheme?

According to Ofgem, you’ll be able to take advantage of the ECO4 scheme if you are a core group customer from scheme year nine onwards under the Warm Home Discount Scheme, or you receive at least one of the following benefits:

  • Armed Forces Independence Payment
  • Attendance Allowance
  • Carer's Allowance
  • Child Benefit
  • Constant Attendance Allowance
  • Disability Living Allowance
  • Pension Guarantee Credit
  • Income-Related Employment and Support Allowance (ESA)
  • Income-Based Jobseeker's Allowance (JSA)
  • Income Support
  • Industrial Injuries Disablement Benefit
  • Mobility Supplement
  • Personal Independence Payment
  • Severe Disablement Allowance
  • Tax Credits (Child Tax Credits and Working Tax Credits)
  • Universal Credit

You might also be eligible for the scheme if you are living in social housing with an EPC rating of E, F, or G.

What’s the return on investment from spray foam insulation?

If you’re thinking of getting spray foam insulation, you can expect it to take between three and nine years to break even – but this will depend on the type and size of the property. 

We’ve listed the break-even point of spray foam insulation for different properties below:

Property typeAverage cost for 100mm-thick spray foamAverage break-even point
House£3,412.58.9 years
Bungalow£2,677.57 years
Flat£1,452.53.8 years
Maisonette£2,747.57.2 years

What’s the cheapest type of property insulation?

If you’re looking to insulate your home on a budget, the best option is usually blankets/rolls of fibreglass. Not only is this material affordable, but it is also quite effective – although, you won’t feel the benefits as much as you do with spray foam insulation. 

Thinking of opting for blanket insulation? It'll cost you around £5 per , on average. To give you a better idea of how much this would cost you overall, check out the table below.

Property typeAverage cost for 270mm-thick blanket insulation
Detached house£600
Semi-detached house£500

Data from Checkatrade


Fibreglass is easy to install and comes in rolls or batts (flat panels). Although it’s cheap, bear in mind that there can be some issues with installing it, mainly because it doesn’t neatly fit in small spaces or around obstacles.


Spray foam insulation has its pros and cons. Although it’s one of the most effective products on the market for keeping your home warm, it’s also the most expensive option. 

If you’d like to invest in the most effective type of insulation, pop a few details in this quick form. Once we receive your information, we’ll put you in touch with our trusted insulation installers, who will provide you with spray foam insulation quotes to compare. 

Beth Howell Writer

Beth has a real passion for green living. She’s been absorbed in eco research for over three years, and has become quite the expert. Whether you’re after a new set of solar panels, a home energy improvement, or you want to catch the latest eco news, she’s got your back.

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