Cavity Wall Insulation Grant

Tired of drafty walls and rising heating bills? No worries, and transforming your home's energy efficiency with cavity wall insulation. Government grants are available that cover 100% cost to help eligible households. Enjoy your living in warmer winters with lower energy bills, and less CO2 emission—all at ZERO cost.

A Brief About Insulating Your Cavity Walls

A cavity wall consists of two layers separated by a gap called the cavity. The outer layer is typically made of bricks, while the inner layer can be either bricks or concrete blocks. Homes built before 1929 are not likely to have any such cavity gap between the walls. They are more likely to have solid walls—a single, thick layer made of bricks or stone. Only homes built after 1929 likely have a cavity wall. To identify whether you have a cavity or solid wall, examine the external brickwork structure. Cavity walls display a uniform brick pattern with all bricks laid lengthways. Such walls are usually 10cm thick, having a 5 to 8 mm cavity space between the walls. Cavity wall insulation involves filling the gap (or cavity) between the inner and outer walls with insulating material. It significantly reduces heat loss and keeps your home viable for living in extreme climates.

Insulation Materials Used Between Cavity Walls

Many cavity walls are insulated from the outside by injecting materials. Specialists drill holes, insert insulation (commonly polystyrene beads), and seal them. To insulate, a registered installer drills small holes of depth 18-25mm on the exterior walls. Using special equipment, they blow insulation into the cavity and fill the holes with polystyrene beads. Filling cavity walls isn't a DIY task, and can only be carried out by a pro installer like Berks Insulation. We take about two hours for an average-sized property with easily accessible walls, causing minimal disruption.

Energy Savings

Installation costs vary by home size. Whether a spacious house or a compact flat, you can recoup costs within five years through annual energy bill savings.

Mitigate costs by coordinating work with other home improvements or focusing on specific areas rather than the entire house.

Government Schemes Offering Cavity Wall Insulation Grants

ECO4 Scheme

It provides 100% funding for cavity wall insulation, prioritizing low-income households who claim certain government benefits.

Eligibility:

Must meet income thresholds or receive certain benefits:

Universal Credit
Pension Guarantee Credit
Pension savings Credit
Income-based Job seeker’s Allowance
Income-related Employment & Support Allowance
Income Support Allowance
Working Tax Credit
Child tax credit

Property should have uninsulated cavity walls and a low EPC rating (D, E, F, or G).

Great British Insulation Scheme

The GBIS grant also covers 100% funding for the cost of insulation material in addition to the installation.

Eligibility:

Targets homes with high energy costs.
Open to both homeowners and private tenants (with landlord consent).
Homeowners are not required to receive government benefits.
Property should be located in a council tax band from A to D (A to E for Scotland & Wales)
Your property’s EPC rating should be below D.

Benefits of Cavity Wall Insulation Grant

Absolutely Free: Government grants will cover all the cost of material and installation, putting zero financial burden on homeowners.
Reduced energy bills: Reduce heat loss from your property by up to 35%, while saving energy bills by up to by £300 every year.
Warmer, cosier home: Say goodbye to chills and hello to snug comfort, all year round.
Improved EPC rating: Improve your Energy Performance Certificate rating, making your property more attractive to buyers and potentially increasing its value.
Eco-friendly: Minimise carbon footprint and put your part to protect the planet Earth from the effects of global warming caused by excessive CO2 emission.

Other Eligibility Checklist

✅ The external walls are unfilled cavity walls.

✅ The cavity is at least 50mm wide and clear of rubble.

✅ The masonry or brickwork is in good condition.

✅ Walls aren’t exposed to heavy rain.

✅ Your home isn’t at risk of flooding.

✅ An installer will survey your house to confirm suitability. If suitable, they can be insulated using mineral wool or polystyrene beads.

Important Precautions

Some precautions need to be taken by not applying insulation if you have damp patches on internal walls; resolve the issue first with a damp prevention specialist.

For houses with narrow or uneven cavities, exposed locations, or flood risks, polyurethane foam may be an option. It’s pricier but highly effective. A specialist foam insulation installer will assess and perform the work if suitable.

If your home’s exterior walls connect to another house, a cavity barrier will be inserted to prevent affecting your neighbours.

For flats, insulation typically requires agreement from everyone in the block; individual flat insulation is usually not feasible.

Take the First Step to Live in Energy-Efficient Home

Don’t miss out the chance to live in a warmer home with more affordable heating. With government-backed cavity wall insulation grants, you can upgrade your property at absolutely zero cost, and start saving money every year.

Cavity Wall Insulation Grant

A Brief About Insulating Your Cavity Walls

Insulation Materials Used Between Cavity Walls

Energy Savings

Government Schemes Offering Cavity Wall Insulation Grants

ECO4 Scheme

Great British Insulation Scheme

Benefits of Cavity Wall Insulation Grant

Other Eligibility Checklist

Important Precautions

Take the First Step to Live in Energy-Efficient Home

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