Funding Available from GOV.UK

Cavity Wall Insulation Grants UK 2024

£1000s in Free Grants to Insulate Your Home & Reduce Your Heating Bills

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Up to £40,000 in Funding Available from GOV.UK

How do the grants work?

Free grant funding is available to eligible households for a range of home insulation measures including cavity wall insulation

£1000s in Funding Available from GOV.UK

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Enter Your Details

Provide a few basic details to get started

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Book Your Free Survey

We visit your property for a home insulation survey

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Insulation Installed

If you are happy with your quote (including any grant funding), your insulation will be installed

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Save On Energy Bills

Start enjoying savings on your heating bills

Free cavity wall insulation funding is available to qualifying households to help them with the cost of cavity wall insulation installation. In most cases, the home must be owned by the occupier, although there may be other circumstances in which private tenants may be eligible, so it is still worth making an inquiry to see what help you could get.

The grants, which do not have to be repaid, are part of the Government schemes, including the Energy Companies Obligation (ECO) scheme and the Boiler Upgrade Scheme, which aim to help to households that are low income, vulnerable and fuel poor  by offering them free insulation such as cavity wall insulation. The grants are provided by the major energy energy companies as part of a commitment to reduce overall carbon footprints.

Cavity wall insulation is a great way to cut your energy bills and make your home warm and cosy. By get cavity wall insulation installed properly you could cut heat loss by up to a third and reduce your annual heating bills by up to £485 (according to Energy Saving Trust figures based on fuel prices as of January 2024), depending on the type of property you live in.

How do you qualify for the grant?

Funding for cavity wall insulation comes from the government energy efficiency schemes which have the twin aims of reducing carbon emissions and helping households that otherwise would struggle with the costs of heating their homes. Now (since April 2022) in its 4th iteration, eligibility under ECO4 differs from the previous ECO3 scheme in that it is not just based on being in receipt of benefits. 

The ECO4 scheme is more closely related to household income to ensure that those low income households who are not in receipt of benefits can still take advantage of the free insulation grants available. Households must have an income of £31,000 or less. Additionally, homes with Energy Performance Certificate bands A, B and C will no longer be covered by the scheme as households in these bands are deemed to be energy efficient enough.

cavity wall insulation costs without a grant
how do I qualify for a cavity wall insulation grant

Those who currently are in receipt of government benefits could qualify for free cavity wall insulation under ECO4. For the purposes of assessing eligibility, the following benefits are  relevant:

  • Income-based Jobseekers Allowance (JSA)
  • Income-related Employment & Support Allowance (ESA)
  • Income Support (IS) 
  • Pension Credit Guarantee Credit 
  • Working Tax Credit (WTC)
  • Child Tax Credits (CTC)
  • Universal Credit (UC) 
  • Housing Benefit (new eligible benefit under ECO4)
  • Pension Credit Savings Credit (new eligible benefit under ECO4)


Alternatively, funding is available under the Great British Insulation Scheme for low energy efficient homes in the lowest Council Tax bands. The Scheme provides funding for the following:

  • Households with an EPC rating of D or below
  • Households in Council Tax bands A-D in England & A-E in Scotland and Wales
  • Funding is targeted at those that haven’t previously received government funding 

Help for cold households that are not energy efficient

As the ECO scheme aims to help those households who would benefit most from cavity wall insulation, grants are targeted at those whose EPC puts them in the bands E, F or G. Householders additionally need to meet any two of the following qualifying criteria:

  • Reside in a deprived Lower Super Output Area 1-3 
  • Receives a Council Tax rebate (excluding single person rebates)
  • Have been referred under a local authority  scheme that supports low income and vulnerable households.
  • Receive free school meals
  • Has been referred for support by Citizens Advice, their energy supplier or mortgage lender due to difficulties paying utility bills and mortgage payments.


Help may also be available for those who are suffering from health issues that could be worsened by living in a cold home, such as respiratory, cardiovascular, mobility or immunosuppressed conditions.

cavity wall insulation UK 2022

How does the process work?

  1. Complete an online enquiry
  2. Schedule a free home visit & survey
  3. Arrange the installation at a convenient time for you
  4. The Government grant is claimed on your behalf

Why might you need cavity wall insulation?

If you live in a brick built older property, likely built between 1924-1982, there is a high possibility that it has a cavity space or gap that has never been filled with insulation. If this is the case, this will have a serious impact on the energy efficiency of your home – putting it in a low EPC rating category of D, E, F or G – and having a major impact on your heating costs.

Due to a change in building regulation, properties built after 1982 were required to have insulation installed in the cavity at the time of construction but this did not always happen. In some instances, the cavities may have been filled at a much later date, and you can usually see the give-away sign of this with drill holes filled with mortar after the cavities had been filled with insulation.

If you are unsure, you can check the Energy Performance Certificate for your home – if you live in England and Wales  or Scotland – and see whether it recommends that cavity wall insulation is installed or has already been installed. space 

free cavity wall insulation

How do you know if your property is suitable for cavity wall insulation?

If your property falls within the date ranges mentioned above then there is a good possibility it has cavity walls that need to be filled, if they haven’t been already. Properties built before 1924, tend to have solid walls and are therefore not suitable for cavity wall insulation.

You should only consider cavity wall insulation if:

  • The property was not built before 1924 or after 2005.
  • The cavities have not already been insulation filled.
  • The cavities are at least 2 inches wide.
  • The brickwork or masonry is in good condition.
  • Walls are dry with no signs of damp inside or to the exterior.
  • Ventilation is adequate and a vent can be fitted.
  • The external walls are accessible.


It has been estimated by research by the Department of Energy and Climate Change (DECC), which is now the Department for Business, Energy & Industrial Strategy, that 42% of properties that have cavity walls are still to be insulated

What sort of savings can cavity wall installation bring me?

Cavity wall insulation can result both in energy bill savings and a significant reduction in the amount of CO2 being emitted from a property.

Property typeEnergy bill saving (£/year)Carbon dioxide savings (kgCo2/year)
Detached house£4851100kg
Semi-detached house£280650kg
Mid-terrace house£165380kg
Detached bungalow£210485kg
Mid-floor flat£135305kg

*Savings estimated on a gas-heated home based on fuel prices in January 2024 (Source: Energy Saving Trust)

How can we help

Complete our online form and we will introduce you to an approved Installer who will be able to carry out checks to see if your property is suitable for cavity wall insulation and whether you are likely to qualify for a grant.

If you have unfilled cavity walls, we can fill the gap with glass fibre or mineral wool to ensure as much heat as possible stays in your home. And if you qualify for the Energy Company Obligation grant you might not have to pay a penny. 

What happens next?

  1. Fill out our form and we’ll put you in contact with an approved installer to arrange a free survey. 
  2. If your property is eligible and you want to go ahead, the installer will then schedule the installation at a convenient time for you.
  3. Once installed, the installer will claim the grant amount on your behalf.


If you are not entitled to a free cavity wall insulation grant, we can still arrange a free survey and quote for you. With energy costs escalating, cavity wall insulation is one of the most straightforward ways to reduce your energy bills. Energy Saving Trust estimates a typical semi detached could have annual savings of £280 with cavity wall insulation installed.

Cavity Wall Insulation FAQs

Cavity walls consist of two separate thin walls (usually made of brick) with a gap (or cavity) between them. Cavity wall insulation – usually mineral fibre wool, polystyrene granules or beads or polyurethane foam can be used to fill this gap and create a good insulating barrier to reduce the amount of heat escaping. This can reduce the amount of heat loss through the walls by as much as 35%.

Cavity wall insulation grants are available to those that own their property or rent it from a private landlord. Unfortunately, they are not available to Local Authority or Housing Association tenants unless they own 50% or more of the property.

Cavity wall insulation grants are free to those who are eligible and do not have to be repaid. The main energy providers are obligated to provide funding for the work. In most cases, this means you will get your insulation installed entirely for free. However, there may be instances where you may have to contribute towards the cost, depending on the size and EPC of your property.

Some benefits have been removed from the qualification criteria for ECO4 (listed above). For those in receipt of disablement benefits, only means tested benefits apply. However, several benefits have been added in ECO4 including Housing Benefit and Pension Credit Savings Credit.
If your property doesn’t have cavity walls, don’t worry, you may be able to claim a grant for external wall insulation or internal wall insulation for your solid walls. Alternatively, you may be able to get a grant for other forms of insulation including loft insulation, spray foam insulation and underfloor insulation.
Insulation must be installed from the ground floor to the roof. This means that you would need to have the consent of any neighbours above and below you and that they must make a separate application and be assessed individually for a grant.
Cavity wall insulation reduces heat loss by filling the air space between walls with a material that stops heat transfer. This can reduce the amount of heat loss by as much as a third.
You will need to have the damp issue addressed before any insulation work can be carried out. You would need to find a builder to help you with this.
In the majority of instances, cavity wall insulation installation is relatively straightforward and can be completed in up to 3 hours. More complex installation can take longer but you will usually be advised of this before work commences.
Cavity wall insulation is sealed within the walls so it poses no risk to those living in the property whatsoever. Modern insulating material for cavity walls has proven performance and usually consists of expanded polystyrene beads or polyurethane foam that have no health implications.

Cavity wall insulation can make a significant difference to a household’s carbon footprint. The amount of CO2 reduction is dependant on several factors, most notably the size of a property. According to Energy Saving Trust estimates, a typical detached house fitted with cavity wall installation could save as a much as 1,100kg in Co2 emissions whereas a small mid-terrace house could reduce its carbon emissions by around 380kg annually. 

Types of Insulation Available

There are many different types of insulation available to suit any home.

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Loft Insulation

One of the easiest ways to insulate your home quickly

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Spray Foam Insulation

Energy Efficient Expanding Foam Spray

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Cavity Wall Insulation

Insulation installed within the cavity space of your walls

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External Wall Insulation

Insulation installed externally outside the home

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Flat Roof Insulation

Insulation installed for a range of flat roof buildings

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Internal Wall Insulation

Retain your heat with effective internal insulation

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Party Wall Insulation

Insulation for walls between internal rooms

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Underfloor Insulation

Insulation to minimise heat loss through the floor

£1000s in Funding Available from GOV.UK

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Disabled Grants

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Landlord Grants

Pensioner grants

Pensioner Grants

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Veteran Grants

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There has never been a better time to take advantage of insulation funding grants 

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£1000s in Funding Available from GOV.UK

Enquire today and find out how much in Government funding you could get:

A registered installer will be in contact
Your home's suitability for insulation will be assessed
A suitable insulation option will be recommended
Convenient installation date arranged

Free Funding to Install Home Insulation