Is Cavity Wall Insulation Suitable for Your Home?
If your house is relatively new, it probably already has insulation. To confirm, follow these steps:
Inspection
Hire a registered installer to carry out an inspection. They’ll drill a small hole into your external wall to check whether the cavity is empty or already insulated.
Building Control Department
You can also consult your local authority’s Building Control Department for records or guidance on your property’s insulation status.
Understand the Cavity Wall
A cavity wall consists of two layers of masonry separated by a gap (the cavity). Typically, the outer layer is made of bricks, and the inner layer is either bricks or concrete blocks.
Homes built after the 1920s are likely to have cavity walls.
Homes built before the 1920s may have solid walls (a single thick wall of bricks or stone).
How to identify?
Look at your external brickwork:
Cavity walls: Uniform brick pattern (all bricks laid lengthways).
Solid walls: Alternating brick patterns, often with short ends showing.
Costs and Savings
The installation cost depends on your home’s size. Whether it’s a spacious detached house or a smaller flat, most homeowners recover costs within five years thanks to lower energy bills.
Tip: Combine cavity wall insulation with other home improvements to reduce total labour costs or choose to insulate selected areas if full-house insulation isn’t feasible.
Important Notices
Your home is typically suitable for standard cavity wall insulation if:
It has unfilled external cavity walls.
The cavity is at least 50mm wide and free from debris.
Brickwork or masonry is in good condition.
The home is not exposed to persistent heavy rain.
The property is not at high risk of flooding.
A professional surveyor will verify these conditions before proceeding. If approved, insulation is installed using mineral wool or polystyrene beads.
Special cases:
For homes with narrow cavities, exposure to the elements, or flood risks, polyurethane foam may be used—though it’s more costly and requires a specialist assessment.
Note:
Fix any internal damp issues before insulation.
If your wall is shared with a neighbour, a cavity barrier will be installed to prevent insulation overflow.
In flats, all residents must agree—individual cavity insulation is not possible.
Here’s How Cavity Wall Insulation with Ranova Energy Transforms Your Home
Lower Energy Bills
Save up to £515 annually on heating—equivalent to a free holiday every year!Warmer, Cosier Home
Experience even warmth and comfort throughout all seasons.Enhanced EPC Rating
Improve your home’s energy efficiency rating, boosting its value and appeal to buyers.Eco-Friendly Impact
Significantly reduce your carbon footprint and contribute to a sustainable future.