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Cavity Wall Insulation Scotland

Cavity wall insulation was first introduced to Scotland during the 1970’s becoming the most popular type of home insulation by the 1990’s when for it a time it was made compulsory for all new build homes in the country.

Like everything else, the technology of materials and skillset for installing cavity wall insulation has improved dramatically since that time, with the last systems using cavity wall beads or blown in mineral wool insulation. These modern materials ensure the insulation between the external and internal walls (in the cavity) is air tight, preventing any issues caused by gaps such as dampness.

Cavity wall insulation has been shown to reduce your homes overall heat loss by up to 33% and alongside loft insulation is the most popular type of home insulation installed in Scotland today.

This blog will breakdown the energy saving benefits of cavity wall insulation and information on the government grants available to people in Scotland during 2024.

Grants Available For Cavity Wall Insulation in Scotland?

You may have noticed when looking online, there are a number of grants available for cavity wall insulation and home insulation in general these days, it all gets very confusing! 

In Scotland, the leading sources of government funding for cavity wall insulation are via Home Energy Scotland, the ECO 4 Scheme and the Great British Insulation Scheme.

On this blog we will breakdown each grant that is available, including the amount of funding, each scheme’s benefits, what the criteria is to qualify and the process for application. The aim being to make the large amount of information and different options as easy to understand as possible.

See lower down on this page more information on each government grant scheme including the criteria for who qualifies.

Does Cavity Wall Insulation Improve EPC Rating?

Cavity wall insulation is the leading measure of home insulation recommended by Home Energy Scotland and The Energy Savings Trust to improve your homes EPC rating. Alongside loft insulation, cavity wall insulation provides the highest heat retention benefits and correlating impact on energy performance certificate ratings. 

Benefits of Cavity Wall Insulation

Cavity wall insulation has been shown to make a 4 to 20 point rating improvement on your homes EPC rating. You are likely thinking this is rather broad range, the impact differs depending on your homes suitability including the walls and floors, your central heating system and fuel type and what other measures you have taken alongside having cavity wall insulation installed. 

The up to 33 percent reduction in overall heat loss will result in lower heating bills, especially during the winter when usage increases. 


Cavity wall insulation and anything that makes for a well insulated home for that matter, will not only be warmer during the winter, but have cooler air and less fluctuation in temperature during the rest of the year.

Your decreased energy usage by having a better insulated home reduces your carbon footprint, contributing to environmental conservation and sustainability efforts.

Improved insulation and better heating can enhance indoor comfort by maintaining a more consistent temperature and reducing any drafts.

A higher EPC rating and well insulated home can increase the market value of your property, as energy efficient homes are in demand these days and may attract more premium prices.

There are various government grants available for cavity wall insulation as it the leading measure for home insulation in Scotland.

Cavity wall insulation improves your homes EPC rating

TrustMark Approved Insulation Installers

The cavity wall insulation installers we partner with have many years experience installing cavity wall insulation in Scotland and are fully approved by TrustMark. 

TrustMark is the essential accreditation for installers to be able to provide installation for Government funded insulation. There are a number of different grants available for cavity wall insulation in Scotland during 2024, TrustMark is universally required for all of them.

Great British Insulation Scheme

The Great British Insulation Scheme has the highest chance of you being awarded a grant for cavity wall insulation, loft insulation and internal wall insulation.

This scheme has over £1 billion of funding available across the United Kingdom specifically for grants towards home insulation. If you are awarded a grant you will either have your home insulation installed 100% free or substantially reduced. Free loft insulation, free cavity wall insulation and free internal wall insulation are the most likely free options to be awarded and installed in Scotland. For part funded grants, it is similar but it is open to a few more types of insulation measures.

All of the insulation measures available include:

The criteria to qualify is incredibly open, meaning grants are available for most people in Scotland looking to insulate their homes! The criteria very (refreshingly) simply includes:

It’s easy to apply, simply complete our online form to begin your application and you will find out shortly if you qualify. 

Video explaining the Great British Insulation scheme and its benefits.

Cavity Wall Insulation Grants For People on Benefits

ECO 4 Scheme

The largest government grant scheme available in the United Kingdom in terms of the amount of funding, wide range of products and the most commonly awarded is the energy company obligation known as the ECO 4 scheme. There is over £4 billion of funding that’s been made available to specifically tackle fuel poverty, by improving energy efficiency and heating of homes throughout the UK. 

The ECO 4 scheme has ran since April 2022 and the current £4 billion funding runs until March 2026, with plenty more funding still available. It is compulsory you are on some form on income related benefits to qualify for the standard version of the eco 4 scheme. 

This includes people with disabilities who receive income related benefits and pensioners who are receipt of either pension credit guarantee or pension credit savings.

When an eco 4 grant is awarded for cavity wall insulation, loft insulation or external wall insulation for example, you will normally qualify for other products too meaning you can upgrade your central heating system or install some renewables.

Listed below are the main benefits that mean you will qualify for eco 4 funding.

There is however an option for people who work full time or part time on lower incomes below £31,000 per year known as the ECO 4 flex. This scheme is only available in certain local councils.

Video breaking down government grants available for home insulation, with the main focus being on the ECO 4 scheme.

Cavity Wall Insulation Grants for People on Low Income

ECO 4 Flex Grant

The ECO 4 flex or local authority flex, stands as an additional grant option within the ECO 4 scheme available for people on lower incomes. The ECO 4 flex program provides financial assistance to individuals with an income below £31,000 who do not receive benefits. To qualify, applicants must have a home with an EPC rating below D and fulfil additional specified criteria.

This particular grant is available for cavity wall insulation in most local council areas of Scotland. Via Insulation Scotland however, the LA flex scheme is limited to Renfrewshire, South Lanarkshire and North Lanarkshire local council areas, where our partner installers have a green light to install if a grant is awarded.

Home Energy Scotland Grant and Loan

Possibly the most well known grant in Scotland for home insulation, the Home Energy Scotland Grant and Loan.

Home Energy Scotland offer free advice on grants available in Scotland for ways to reduce living costs and improve your homes EPC rating. They provide sound advice on which products are most likely to have the best impact in these areas and the ones that are you are most likely to qualify for funding.

Most of their funding is aimed at central heating and renewables, including grants for solar panels, grants for air source heat pumps and grants for electric storage heaters.

In terms of home insulation and in particular cavity wall insulation, Home Energy Scotland has a grant called the Warmer Homes Scotland programme. This grant provides funding of up to £10,000 or more on all insulation and heating products, which specifically for home insulation provides a discount for up to £1,500.

The installers we work with don’t facilitate HES grants and it is difficult to find independent insulation installers in Scotland that do. 

You will need to find installers that are TrustMark approved in the particular type of home insulation you are looking to have installed. The funds are not released to the installers until several months after the installation, making it less appealing and manageable for smaller insulation installers to provide quotes for.

Anyone can speak to Home Energy Scotland for advice and apply for one of there scheme’s depending on the products they are interested in. There are no criteria that mean you definitely won’t qualify, unlike needing income related benefits for the ECO 4 scheme or you have a certain EPC rating or council tax band for the Great British Insulation scheme.

Short video on the measures Home Energy Scotland have taken to improve EPC ratings in Scotland and reduce the cost of living expenses.

Other Cavity Wall Insulation Grants in Scotland

There are other less known and less available cavity wall insulation grants in Scotland. These include the Green Deal Loan and CARES funding which is specifically for community and voluntary organisations, local charities and faith groups.

However, you have the pay the Green Deal loan back and CARES funding is not relevant for individuals. 

Grants for landlords in Scotland

For landlords in Scotland, installing cavity wall insulation can significantly improve the energy efficiency of your property, reduce energy bills for your tenants, and ensure comply with regulatory standards. In some cases there is 100% free cavity wall insulation depending on you and your tenants circumstances and in most cases, some form of grant is available to reduce the installation costs. If your rented property has a council tax band of A to E and an EPC rating of D or below you will likely be awarded a grant. Here are key points regarding cavity wall insulation for landlords in Scotland:

Benefits for Landlords

  1. Improved Energy Efficiency: Cavity wall insulation helps reduce heat loss, making properties warmer and more energy-efficient. This can increase the property’s attractiveness to potential tenants.
  2. Compliance with Regulations: The Scottish Government has set minimum energy efficiency standards for private rented properties. Ensuring properties meet these standards is crucial for compliance and avoiding penalties.
  3. Increased Property Value: Energy-efficient properties can attract higher rents and increase overall property value.

Eligibility for Grants

Landlords may be eligible for government grants and schemes to help cover the cost of cavity wall insulation. Two main schemes are currently available:

  1. Energy Company Obligation (ECO4): This scheme provides funding for energy efficiency improvements, including cavity wall insulation. Landlords with tenants who receive certain income-based benefits may qualify. The scheme focuses on properties with low EPC ratings (below D for homeowners or E for renters) and aims to improve energy efficiency and reduce fuel poverty​.

  2. Great British Insulation Scheme (GBIS): This scheme offers grants for single insulation measures in qualifying households. It is designed to help those in council tax bands A-E in Scotland and aims to improve energy efficiency by installing cavity wall insulation and other measures​.

Application Process

  • Survey and Assessment: A surveyor will need to assess your property to ensure it is suitable for cavity wall insulation.
  • Landlord Permission: If a tenant applies for the grant, explicit permission from the landlord is required.
  • Contact Energy Providers: Landlords can contact their energy suppliers or visit the official websites of ECO4 and GBIS to apply for these grants and get more detailed information.

Considerations for Landlords

  • Property Suitability: Not all properties are suitable for cavity wall insulation. An assessment will determine if the property has cavity walls and if they are in good condition for insulation.
  • Maintenance and Repairs: Post-installation, landlords should ensure the insulation is maintained properly to avoid issues such as dampness.

By taking advantage of these insulation grants, landlords in Scotland can enhance the energy efficiency of their properties, improve tenant satisfaction, and ensure compliance with energy efficiency regulations. For more detailed information, landlords can visit the official government websites or contact their energy providers directly​.

How Quick Can Cavity Wall insulation be installed?

The installation of cavity wall insulation is a relatively quick process and typically can be completed in a single day for most homes. Here’s a more detailed breakdown:

  1. Assessment: Before installation, a surveyor will inspect the property to ensure that it is suitable for cavity wall insulation. This initial assessment might take about an hour.

  2. Preparation: On the day of installation, the team will prepare the site, which includes setting up equipment and drilling small holes into the exterior walls of the house. This preparation phase usually takes a couple of hours.

  3. Installation: The insulation material, whether it is mineral wool, polystyrene beads, or foam, is then injected into the cavity through the drilled holes. This process is efficient and typically takes 2 to 3 hours, depending on the size of the property.

  4. Finishing Up: After the insulation is in place, the drilled holes are filled and sealed to match the existing wall. This final step ensures the aesthetic and structural integrity of the building. Finishing up can take an additional hour or two.

In total, for a standard-sized home, the entire process of installing cavity wall insulation usually takes no longer than 24 hours in total. Larger or more complex properties might require additional time, potentially extending to a second or third day depending if old insulation needs removed and other preparation work is required.

Cavity Wall Insulation Grant F.A.Q

Not always no. You will only get your cavity wall insulation 100% free if you have various eligibility factors, such as a lower home EPC rating. This will also come down to wether you have qualified for and used funding via a grant in the past.

We can submit your grant application, we can have it approved in 48 to 72 hours and have your cavity wall insulation installed within 7 days in some cases. The quicker you begin the process, the quicker we can provide you with a timescale and get the ball rolling for installation.

To determine if your walls are cavity walls, you can use several methods. You can check your wall thickness, by measuring the thickness of the walls at a door or window. For brick walls, if the wall is more than 260mm (about 10 inches) thick, it is likely a cavity wall. Solid brick walls are typically about 225mm (9 inches) thick.

Your buildings construction date is another sign, buildings constructed after the 1920s in Scotland often have cavity walls. Cavity wall construction became widespread in the 1930s. Older buildings built before the 1920s are more likely to have solid walls.

We are happy to assist with this either on the phone or during a home survey, by carrying out a professional inspection.

Cavity wall insulation is not always going to be the best suited insulation for your home, both in terms of improving temperature and your EPC rating. We will consult on which type is best and can install other measures such as loft insulation.

Yes we are fully approved installers.  Including vital TrustMark accreditation to be able to complete government funded work.

We need to go through your grant application first, and then we can discuss costs with this deducted, everything will be explained step by step.

At the moment we only install cavity wall insulation in Central Scotland including Perth, Fife and Lower Scotland. If you are looking for other products such as central heating and renewables, we can travel further afield.

Insulation Scotland

Approved Cavity Wall Insulation Installers

Apply For A Cavity Wall Insulation Grant

Please complete our short contact form below to and to begin your application process.

Please allow up to 48 hours for a response from one of our representatives to discuss if you qualify for a grant.

Cavity Wall Insulation Grant Scotland

The first step to applying for a grant takes seconds and in most cases we can let you know instantly on the phone if you qualify.

Cavity Wall Insulation Grants Scotland

Our team of insulation contractors and surveyors travel all over Scotland providing management of cavity wall insulation grants and installation in Aberdeenshire, Angus, Argyll & Bute, Ayrshire, Clackmannanshire, Dumfries and Galloway, Dundee, East Ayrshire, East Dunbartonshire, East Lothian, Edinburgh, Glasgow, Falkirk, Fife, Highland, Inverclyde, Inverness, Midlothian, Moray, North Ayrshire, North Lanarkshire, Perth and Kinross, Renfrewshire, Stirling, South Ayrshire, South Lanarkshire, The Borders, West Dunbartonshire and West Lothian. 

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