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The Basics
Cavity wall insulation works like a thermal jacket for your home, helping to keep the heat in during winter and the excess heat out during summer. It’s a simple yet effective way to maintain a comfortable temperature all year round.
The Benefits
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Lower energy bills (can save £200–£400+ a year
- Government Grant to Cover the Full Cost.
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Reduced carbon footprint
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Improved EPC rating
- Warmer home in winter and cooler in summer
Cavity Wall Insulation Grant
A cavity wall grant helps homeowners cover the cost of insulating their property’s cavity walls, improving energy efficiency and reducing heating bills. Start your grant application with us today and see if your eligible.
Useful Information
What is cavity wall insulation and how does it work?
Cavity wall insulation fills the gap (cavity) between a building’s outer and inner walls with insulating material. This reduces heat loss by trapping warm air inside your home and keeping cold air out, making your heating more efficient.
Is my home suitable for cavity wall insulation?
Homes built between 1920 and 1990 typically have cavity walls. To be suitable, your walls must be unfilled, at least 50mm wide, and in good condition. Please note: Homes in very exposed, wet areas may not be ideal without extra ventilation.
What are the the key benefits of cavity wall insulation?
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Lower energy bills (can save £200–£400+ a year)
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Warmer home in winter and cooler in summer
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Reduced carbon footprint
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Government Grant to cover the cost.
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Improved EPC rating
Are there government grants or schemes to help with the cost?
Yes schemes like ECO4 (Energy Company Obligation), LA Flex, and local authority funding can cover all of the cost.
Can cavity wall insulation cause damp problems?
If installed incorrectly or in unsuitable walls with poor ventilation, existing damp issues, or walls exposed to driving rain can lead to moisture bridging, a survey will carry out if your home is suitable to have wall insulation.
How is cavity wall insulation installed and how long does it take?
Installers drill small holes in the outer wall, inject the bead insulation, then seal the holes. The insulation is made out of recycled glass to not withhold any moisture. It usually takes 2–4 hours for an average home and causes minimal disruption. The outer wall is left nearly indistinguishable from its original state.
Can cavity wall insulation improve my home’s energy rating or resale value?
Yes. It can raise your EPC rating, making your home more attractive to buyers and potentially increasing its resale value, especially as energy efficiency becomes more important to homeowners and mortgage lenders.
How do I know if my walls already have cavity wall insulation?
You can check by:
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Looking for small drill holes in a regular pattern on external walls (a sign of past installation)
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Asking for documentation from previous owners or your EPC
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Hiring a professional to use a borescope camera to inspect the cavity. (This check we complete on all of our surveys)
How do I know if I have solid or cavity walls?
You can often tell by looking at the brick pattern:
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If the bricks are all laid lengthways in a regular pattern (called stretcher bond), your walls likely have a cavity.
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If you see some bricks laid with the short end facing out (called English or Flemish bond), it’s probably a solid wall.
Another way is to measure the wall thickness:
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Cavity walls are usually around 260mm (10 inches) thick.
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Solid walls are usually less than 220mm (8.5 inches).
If unsure, a qualified surveyor or energy assessor can confirm it for you.
Does cavity wall insulation make a noticeable difference in comfort?
Yes, most homeowners report a more stable indoor temperature after installation. Rooms heat up faster, stay warmer longer, and feel less draughty—especially during colder months.
Will cavity wall insulation reduce noise from outside?
It can help slightly reduce external noise, especially with mineral wool or bead insulation. However, it’s not designed as soundproofing, so the effect will be modest compared to dedicated acoustic insulation.