Cavity Wall Insulation Grants

Grants are available to cover the entire cost of professionally installing Cavity Wall Insulation if you receive qualifying benefits.

All new cavity wall insulations are carried out by qualified builders.

Verify your eligibility today.

Apply for a cavity wall insulation grant

Funding for free cavity wall insulation is available to eligible households, assisting with the expenses associated with the installation of cavity wall insulation.
Circle Pattern
NICEIC Approved Contractor
Worchester Bosch Group Logo
Gas Safe Logo
Elmhurst Energy Approved
Vailant Logo
Trustmark Logo

How do I know if I qualify for a ECO4 cavity wall insulation grant

The UK government funding for cavity wall insulation is sourced through energy efficiency schemes with the objectives of reducing carbon emissions and assisting households facing challenges in covering heating expenses.

The ECO4 grant scheme is now more closely tied to household income, ensuring that low-income households who are not claiming eligible benefits can still have access to free insulation grants. To qualify, households must have an income of £31,000 or less.

Homes falling within Energy Performance Certificate Bands A, B, and C are no longer eligible for the scheme, as they are considered sufficiently energy efficient.

You must be claiming one of the qualifying Government Benefits to apply for cavity wall insulation grant:

You need to either be a homeowner or a tenant in a privately rented home

To qualify for a cavity wall insulation grant ECO4 grant, your home must be either privately owned or rented when we complete the property survey.

Homeowners cavity wall insulation grant


Homeowners applying for an ECO4 cavity wall insulation grant must have a home with an EPC rating of D, E, F, or G.

Private Tenants cavity wall insulation grant

Private Tenants

Privately rented home must have an EPC rating of E, F or G to be eligible for cavity wall insulation grants.

What is cavity wall insulation?

Brick-built properties erected between 1924 and 1982 are likely to have a cavity between two brick layers or between bricks and blocks. It is likely that this space was left uninsulated during the initial construction of the property. Cavity wall insulation utilises materials such as mineral fibre wool, polystyrene granules, beads, or polyurethane foam and is applied to fill this gap.

This process creates an effective insulating barrier, significantly diminishing heat loss through the walls and potentially reducing heat loss by up to 35%. If cavity wall insulation cannot be applied to your home you may be able to claim for an external wall insulation grant.

What is cavity wall insulation

Find out if you can apply for cavity wall insulation today and start saving on your home energy bills.

How do I know if my house is suitable for cavity wall insulation?

Before applying for a ECO4 cavity wall insulation grant it is worth checking your home has cavity walls.

Most properties built of brick from 1924 onwards are likely to have cavity walls. If your property was built before 1924, it is likely to have solid walls. Homes constructed after 1982 should already have cavity wall insulation, as building regulations were changed to require its installation during the property construction process.

Below you can see examples of the brick patterns for cavity and solid walls.

Cavity Wall Bricks Image

Cavity Wall

If your home has cavity walls, the bricks are typically in a uniform pattern, with all bricks arranged lengthwise.

Solid Wall Bricks Image

Solid Wall

For homes with solid walls, the brick arrangement features an alternating pattern, where some bricks are laid across the wall, exposing their smaller ends on the exterior.

Feel free to contact Stellar Insultations Ltd if you need help.

What kind of savings can I expect from cavity wall installation?
Cavity wall insulation can lead to savings on energy bills and a substantial decrease in CO2 emissions from a property.
Type of property Energy bill saving (£/year) Carbon dioxide savings (kgCo2/year)
Detached house
Semi-detached house
Mid-terrace house
Detached bungalow
Mid-floor flat

Savings based on a gas-heated home and fuel prices as of January 2024. (Source: Energy Saving Trust)

Start a claim for a cavity wall insulation grant.
First Time Central Heating Grants FAQs

Listed below are some of the common questions and answers for the UK Government ECO4 cavity wall insulation grant. If you cannot find the answer to your question, then simply contact us for a free consultation.

Cavity wall insulation mitigates heat loss by filling the airspace between walls with a material that prevents heat transfer. This has the potential to cut heat loss by up to a third.
Grants for cavity wall insulation are accessible to property owners and individuals renting from private landlords. Local Authority or Housing Association tenants are ineligible unless they have 50% or more ownership of the property.

If your property lacks cavity walls, there’s no need to worry; you might qualify for a grant for external wall insulation or internal wall insulation specifically designed for solid walls. You may also be eligible for a free boiler replacement grant.

Insulation installation is required to extend from the ground floor to the roof. Consequently, obtaining consent from neighbours living above and below you is necessary, and they must also submit separate applications for individual assessments to be eligible for a grant.
You will need to first resolve any damp issues before any cavity wall insultation work can commence.
Cavity wall insulation mitigates heat loss by filling the airspace between walls with a material that prevents heat transfer. This has the potential to cut heat loss by up to a third.
The duration of cavity wall insulation installation typically depends on factors such as the size and complexity of the property. On average, the process can take anywhere from a few hours to a full day.
Cavity wall insulation is securely enclosed within the walls, presenting no risk to the occupants of the property. Insulation materials for cavity walls, typically comprising expanded polystyrene beads or polyurethane foam, are known for their reliable performance and do not carry any health implications.