Funding Available from GOV.UK

External Wall Insulation Grants UK 2024

£1000s in Free Grants to Insulate Your Home & Better Manage Your Finances

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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
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£1000s in Funding Available from GOV.UK

Installing external wall insulation or solid wall insulation into your home can lead to you saving up to £660 a year on energy bills and significantly reduce household carbon emissions. External wall insulation generally costs around £7,000 to £15,000 based on the type and size of your home, but you could be eligible for external wall insulation grants through the ECO (Energy Company Obligation) scheme.

Insulation grants can help make your home more energy efficient and reduce carbon emissions to contribute towards the government’s 2050 net zero target. External insulation could reduce the heat loss from your home by around 35%.

Below are some of the annual savings (according to Energy Saving Trust figures and based on fuel prices as of January 2024) you could enjoy by having external wall insulation installed:

  • Detached house: £660 a year
  • Semi-detached house: £380 a year
  • Bungalow: £285 a year

Find out if you are eligible for an external wall insulation grant to help with the cost of insulating your home.

Who can qualify for solid wall insulation grants?

Under the ECO 4 scheme, low-income households (with an annual income of £31,000 or less) or those receiving specific government benefits can qualify for free grants.

Homeowners and some private tenants can be eligible for external wall insulation grants in 2024 through the scheme.

The qualifying benefits include:

  • 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)


If you part own your home with a Housing Association, as long as you own at least 50% you could still be eligible for a grant. If you are a Council or Housing Association tenant, you should speak to them directly or contact the Energy Saving Trust who might be able to help you.

The Great British Insulation Scheme (GBIS) also earmarks funding for low energy efficiency households (EPC rating of D or below) and  with the lowest Council Tax bands (A-D in England  and A-E in Scotland and Wales).

What is external wall insulation?

External wall insulation is where a layer of insulating material (normally 60mm boards) is installed to the solid outside walls and covered with render or cladding. It is an alternative to internal solid wall insulation which is installed inside a property.

There are a range of external wall insulation finishes you can choose from such as smooth, textured, tiled, painted, or brick/stone effects. External wall insulation gives a weatherproof layer that will protect your brickwork, increase sound resistance, and help to prevent issues with dampness.

The insulation material is added to the outside of the home so it won’t reduce the floor area and can be fitted with minimal disruption. Also, it can renew the look of your walls, increase the value of the property, and will help you make significant savings on your heating bills. This type of insulation is often needed for insulating solid wall buildings that have no cavities to fill with insulation, however, there are other situations external wall insulation may be a good option.

What are the benefits of external wall insulation?

  • Substantial heat loss and energy bill savings.
  • Significant reduction in a household’s carbon emissions.
  • Reduction in draughts and a greater sense of warmth and comfort in your home.
  • Does not reduce the internal floor area.
  • Allows walls to contribute to absorb, store and release heat.
  • Increased weatherproofing and sound resistance.
  • Increased lifespan of the wall by protecting the brickwork.
  • Lowers condensation on the internal walls.
  • Particularly beneficial when refurbishing non-traditional housing.
  • Protects the existing building envelope.
  • Improves the appearance of your property.
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What sort of savings can installing solid wall insulation bring?

External 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 savings (£/year)Carbon dioxide savings (kgCo2/year)
Detached house£6601,500kg
Semi-detached house£380880kg
Mid-terrace house£225520kg
Detached bungalow£285660kg
Mid-floor flat£180415kg

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

Is your property suitable to have external wall insulation?

Your home needs to adhere to the following criteria before external wall insulation can be fitted.

  • Be made of solid brick, stone, or concrete (not timber-frame)
  • Have walls that are completely structurally sound and are not in need of repairs
  • Not a listed building or situated in a conservation area/world heritage site
  • No signs of dampness in the walls
  • Have good access to the outer walls
  • Not have cavity walls that are already filled or can be filled


It is also advisable to check with your local council whether you will need planning permission to have external wall insulation fitted. Our partner installer can usually guide you on this. It is unlikely that you will be given permission if the property is a listed building, or it is located in a conservation area/world heritage site. If you are denied planning permission for external wall insulation, you might want to consider internal wall insulation as an alternative option.

If your home is brick-built, you have to be certain that it doesn’t have cavity walls that are able to be filled. If the building was constructed before 1924 it is likely to have solid walls and will need external wall insulation.

Solid and cavity walls

If your walls are solid then the wall will have square brick ends and an alternating pattern, with some bricks laid across the wall so you can see the smaller ends from the outside. If your property has cavity walls, the bricks will have an even pattern with all of the bricks organised lengthways. Solid walls do not have gaps, so they cannot be filled with cavity wall insulation. Whereas cavity walls are made up of two layers – the inner wall and the outer wall – with a small gap or ‘cavity’ between them.

Another useful indicator of solid walls is measuring the thickness next to doors or windows. This is because solid walls tend to be less than 10” thick, cavity walls, on the other hand, are generally more than 10”.

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External Wall Insulation FAQs

Common questions about external or solid wall insulation are answered for you

If cavity wall insulation fails, which can happen in some cases, it is likely because the insulation allows rainwater to get in through the cavity. With external insulation, the weatherproof render will stop the rainwater from accessing the wall and ultimately makes cavity-fill insulation a useful thermal barrier. Splitting the required thickness of insulation between cavity and external is a sensible decision. The cavity will usually be 50mm wide, add 20mm external insulation, in the same way as for solid walls, and the wall will reach a good U value – the measure of how good a material is at insulating.
Outside wall insulation grants do not cover the cost of any repairs that are required in order for the insulation to be installed. A local builder might be able to help you with this before you apply for an external wall insulation grant.
The insulation normally improves the look of a property and boosts its overall value. Also, there are several different finishes to choose from that can ensure the appearance of your home is not negatively affected.
Yes. A large majority of solid wall insulation systems are manufactured and independently audited in accordance with ISO 14001 Environmental Management Standard. External wall insulation systems include materials that are free from CFC and HCFC.
This can depend on the size of the property but typically it may take up to one full week.
Due to the nature of the work, it would be impossible to completely avoid mess and disruption during installation. However, our approved installers are highly professional and will do their best to keep this disruption to a minimum and they will clean up after themselves when the work is completed.

Yes, you could be eligible for a solid wall insulation grant through the ECO scheme or Great British Insulation Scheme (GBIS). Funding for the grant schemes is free and is provided by the main energy companies who are obligated to make a contribution towards helping households install energy efficient measures that will reduce their energy bills and carbon footprints. Check if you can qualify for a free insulation grant today by filling in some basic details on our website.

Professionally installed external insulation is reported to reduce heat loss by up to 45%. For example, a semi-detached home heated by gas could potentially save up to £380 annually on heating costs. Insulating external walls is one of the most energy efficient home improvements you can make to your property. It helps to keep your home warm by stopping heat from escaping and the cold from getting in. This means you will be able to turn your heating on less often and for shorter periods of time, making big savings on your energy bills.
External wall insulation can be expensive but with the help of government grants through the ECO scheme it is a great value and highly effective investment. As we have explored above, the advantages external insulation offers over internal means it is a home improvement you don’t want to miss out on.
External wall is not the only type of insulation that homeowners could get grants for through the scheme. These other insulation services include, cavity wall insulation, internal wall insulation, spray foam insulation, underfloor insulation & roof or loft insulation.
In accordance with Building Regulations, if 25% or more of a wall is going to be insulated externally, it is normally necessary to ensure the entire wall is up to current standards. This makes sense as if you are going to go through the process of getting a grant and planning for the work to be done to insulate externally, you might as well do it right. The thermal performance of the wall that is insulated needs to have a U value of no more than 0.30. Your approved installer will ensure that all work carried out meets the necessary building regulations.

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

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Pensioner Grants

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Veteran Grants

Why Are Households Installing Insulation?

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:

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Your home's suitability for insulation will be assessed
A suitable insulation option will be recommended
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Free Funding to Install Home Insulation