Harben House, Newport Pagnell, MK16 9EY, Milton Keynes, UK

Free Cavity Wall Insulation

Free Cavity Wall Insulation

Cavity Wall Insulation

At Enegex, we specialise in delivering fully funded cavity wall insulation across the UK through the government’s ECO4 scheme. By insulating your walls, you can make your home warmer, slash heating bills, and reduce your carbon footprint, all at no cost if you qualify.

What is Cavity Wall Insulation?

A cavity wall is made of two layers of brick with a gap (the cavity) between them. In homes built between 1924 and 1982, these cavities were often left empty, allowing heat to escape and driving up energy bills.

Cavity wall insulation (CWI) involves filling this gap with insulating material such as mineral wool, beads, or foam, depending on the type of property. This creates a thermal barrier, trapping heat inside during winter and keeping homes cooler in summer.

How Does Cavity Wall Insulation Work?

By filling the gap in your walls, cavity wall insulation: 

Reduces heat loss – prevents warmth from escaping through your walls.
Improves energy efficiency – keeps your home at a stable, comfortable temperature.
Cuts energy bills – reduces reliance on your boiler or electric heaters.
Enhances property value – improves your EPC rating, making your home more attractive to buyers.

Benefits of Free Cavity Wall Insulation

Fully Funded Grants
Your insulation costs can be covered entirely by the ECO4 scheme, with no repayment, no hidden fees.
Lower Heating Bills
A third of heat loss happens through uninsulated walls. With cavity insulation, you could save hundreds of pounds each year.
A Warmer, Healthier Home
Eliminate draughts and cold spots, and enjoy a home that stays warmer for longer.
Environmentally Friendly
Reducing wasted energy means lowering your carbon footprint, supporting the UK’s Net Zero 2050 goals.
Minimal Maintenance
Once installed, cavity wall insulation requires virtually no upkeep.

Is My Property Suitable?

You may be eligible for free cavity wall insulation if: 

Your home was built before 1982 (some homes up to 2005 may qualify).
The walls are unfilled cavity walls with a gap of at least 5cm.
The external walls are in good condition, free from cracks or damage.
Your property is not in a high-risk flood area or subject to extreme weather exposure.

Our experienced surveyors will conduct a free assessment to check suitability, and if insulation is possible, we’ll guide you through the next steps. 

Why Choose Enegex for Cavity Wall Insulation?

UK-Wide Service – delivering insulation solutions across England, Scotland, and Wales.
Trusted Experts – qualified installers with years of experience in ECO-funded home upgrades.
End-to-End Support – from initial survey to installation and aftercare.
Energy Savings Made Simple – we handle all the paperwork and grant applications on your behalf.

What Our Clients Say

Frequently Asked Questions

Cavity wall insulation fills the gap between external brick walls with insulating material, preventing heat loss and improving energy efficiency.
Yes. Under the ECO4 government scheme, qualifying households can have cavity wall insulation installed at no cost.
Most homes built between 1924 and 1982 with uninsulated cavity walls are eligible. Our free survey will confirm suitability.
When installed correctly by qualified professionals like Enegex, cavity wall insulation does not cause damp. We conduct a thorough property survey to ensure there are no pre-existing issues.
Most installations are completed within a single day, depending on the size and type of property.
We use approved insulating materials such as beads, mineral wool, or foam, selected according to your property type and condition.

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Harben House, Newport Pagnell, MK16 9EY, Milton Keynes, UK
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