Reduce Heat Loss & Energy Bills with Government-Funded Cavity Wall Insulation
Cut energy waste and save up to £450 per year with cavity wall insulation. Check if your home qualifies for a free or discounted installation under the ECO4 or Great British Insulation Scheme (GBIS).
Check Your Eligibility for Free Insulation Grants in 2025
Government-backed funding is available now under ECO4 and GBIS. See if you qualify in under 60 seconds.
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Cavity Wall Insulation Grants also for Pensioners and Disabled Households (ECO4 & GBIS)
Pensioner? You may qualify for a FREE cavity wall insulation grant.
Have a disability or health condition? Help may be available.
Why Choose Us?
✔ ECO4 & GBIS Approved Installer
✔ Certified & Accredited Professionals
✔ 100% Government-Funded Upgrades
How it Works
- Apply online in 60 seconds.
- Get a free home survey.
- Enjoy free insulation upgrades.
What Is Cavity Wall Insulation?
Cavity wall insulation is one of the most effective ways to improve your home’s energy efficiency and reduce heat loss. Most UK homes built after the 1920s have a cavity wall—two layers of brickwork with a small gap (or cavity) between them. Without insulation, this gap allows warm air to escape and cold air to seep in, causing higher energy bills and uncomfortable drafts. Installing cavity wall insulation involves filling this space with a high-performance insulating material, such as mineral wool, polystyrene beads, or polyurethane foam. These materials act as a thermal barrier, slowing down heat transfer and keeping your home warmer in winter and cooler in summer.
How Cavity Wall Insulation Works
Cavity wall insulation works by filling the gap between your home’s inner and outer brick walls with a thermal material that slows down heat loss. Most installations use mineral wool, polystyrene beads, or eco-friendly foam injected directly into the cavity through small holes in the external wall. Once filled, these holes are sealed, creating a continuous barrier that keeps warm air inside and cold air out — reducing one of the biggest sources of heat loss in UK homes.
By maintaining a stable indoor temperature, your heating system doesn’t need to work as hard, which means lower energy consumption, reduced wear on your boiler, and a more comfortable living environment throughout the year.
Under the ECO4 and Great British Insulation Scheme (GBIS), cavity wall insulation is often available free of charge or heavily subsidised, depending on your property type and household eligibility.
Benefits of Cavity Wall Insulation
Upgrading or installing cavity wall insulation is one of the most effective ways to make your home more energy-efficient and reduce heat loss.
Whether you own or rent your property, cavity wall insulation prevents warm air from escaping through your walls, keeping your home warmer in winter and cooler in summer.
Here are some of the key benefits of cavity wall insulation under the ECO4 and Great British Insulation
Lower Energy Bills
Save up to £400 a year by reducing wasted heat and improving your home’s energy efficiency.
Warmer Home All Year Round
Maintain comfortable temperatures throughout the seasons.
Reduced Carbon Footprint
By using less energy, you can lower your household’s carbon emissions and environmental impact.
Improved EPC Rating
A higher Energy Performance Certificate (EPC) rating can make your property more attractive to buyers and tenants
Quick, Hassle-Free Installation
Loft insulation can usually be fitted within a few hours by accredited, TrustMark-registered professionals.
Government-Backed Support
Funded through the ECO4 and GBIS schemes, ensuring high-quality installation and compliance with PAS 2035 retrofit standards.
Cavity Wall Insulation Cost and Savings (2025 Update)
Upgrading your cavity wall insulation in 2025 is one of the most effective and affordable ways to reduce energy bills and improve home comfort. The typical cost of cavity wall insulation in the UK ranges between £1,000 and £2,500, depending on your property size, wall area, and construction type.
However, under the Government-backed ECO4 and Great British Insulation Scheme (GBIS), many UK homeowners and tenants can receive cavity wall insulation completely free or at a significantly reduced cost, depending on eligibility and property assessment.
Installing high-quality cavity wall insulation can help you:
Save up to £450 per year on heating costs.
Reduce up to 35% of heat loss through external walls.
Improve your home’s EPC rating, making it more energy-efficient and increasing property value.
Enhance comfort year-round, keeping your home warmer in winter and cooler in summer.
Lower your carbon footprint, contributing to the UK’s net-zero targets.
With professional installation by TrustMark-registered experts, you’ll benefit from long-term energy savings, improved comfort, and peace of mind — all while meeting PAS 2035 retrofit standards.
Simple 3-Step Process Under ECO4 & GBIS
Government Backed ECO4 Scheme
The ECO4 scheme is a UK Government-backed funding programme that helps households in England and Scotland access free boiler replacement, insulation grants, and energy efficiency upgrades. If you meet the ECO4 eligibility criteria, you could qualify for fully funded home improvements to lower your bills and make your home warmer and greener.
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Frequently Ask Questions
Cavity wall insulation fills the gap between your home’s inner and outer walls with insulating material, such as mineral wool or polystyrene beads. This prevents heat from escaping and cold air from entering, helping your home stay warmer for longer and reducing your energy bills.
Common materials include mineral wool, polystyrene beads, and urethane foam. Each type offers excellent thermal performance and is chosen based on your property’s wall type and construction.
You may qualify if you receive certain benefits (like Pension Credit, Universal Credit, or Child Tax Credit) or if your household meets LA Flex criteria under local council approval. Eligibility also depends on your home’s EPC rating and existing insulation.
Yes, under the ECO4 and Great British Insulation Scheme (GBIS), many homeowners and tenants can get cavity wall insulation fully funded or heavily subsidised, depending on their eligibility and property type.
You can save up to £450 per year on energy bills by reducing heat loss through your external walls. It also helps your home stay comfortable year-round with more consistent indoor temperatures.
Most installations take 6 to 8 hours, depending on property size. The process is quick, clean, and completed from outside your home, causing minimal disruption.
When installed by TrustMark-registered professionals and under PAS 2035 standards, cavity wall insulation should not cause damp. Proper ventilation and assessment ensure that only suitable properties are insulated.
Yes, if you are a tenant, your landlord must provide written consent before installation. Landlords are often supportive as it improves EPC ratings and property value.
No, it’s suitable mainly for homes built after 1920 with unfilled cavity walls. Solid-wall homes or properties with existing insulation may not be eligible without a retrofit assessment.
Simply complete our online eligibility form. A certified surveyor will assess your property to confirm suitability and funding options under ECO4 or GBIS.
