How do I know if my walls are cavity walls?

If your home was built after the 1920s, it likely has cavity walls. Check the external brickwork — if the bricks are all laid lengthwise in a uniform pattern, you probably have cavity walls. We check this during our free survey.

How long does cavity wall insulation take?

Typically just 2–3 hours for a standard semi-detached house. Work is done entirely from the outside with minimal disruption.

Is cavity wall insulation messy?

No. The work is done from the outside by drilling small holes in the mortar joints. Once sealed and colour-matched, the holes are virtually invisible.

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Cavity Wall Insulation Coventry

Fill the gap and stop heat escaping

Most homes built after the 1920s have cavity walls — two layers of brick with a gap (cavity) between them. If this cavity is unfilled, heat escapes through it. Cavity wall insulation fills this gap with insulating material, reducing heat loss by up to 35% and cutting your heating bills significantly.

We install cavity wall insulation across Coventry, Nuneaton, Leamington Spa, Kenilworth, Warwickshire, Redditch, Rugby and the West Midlands. Most post-1920s homes in these areas are suitable. Our team can assess your walls during a free survey and confirm eligibility.

How We Carry Out This Service

1
We drill small holes (approximately 22mm) at regular intervals in the outside wall, typically in the mortar joints.
2
Insulation material (EPS beads or mineral wool) is blown through the holes into the cavity using specialist equipment.
3
The material fills the entire cavity, creating a continuous thermal barrier.
4
The drill holes are sealed and colour-matched to the mortar so they're virtually invisible.
5
The entire process typically takes 2–3 hours for a standard semi-detached house.

Materials We Use

EPS Bead (Blown)

Expanded polystyrene beads bonded with adhesive. Standard cavity fill — lightweight and moisture resistant.

Mineral Wool (Blown)

Rock or glass wool blown into cavity. Excellent fire resistance rating. Full cavity width.

Key Facts

Reduces heat loss through walls by up to 35%

Quick installation — typically 2–3 hours

Minimal disruption — work is done from the outside

Drill holes are virtually invisible once sealed

Suitable for homes built after 1920s with unfilled cavities

Building Regulations & Compliance

Cavity wall insulation must comply with Building Regulations Approved Document L. The target U-value for wall renovations is 0.55 W/m²K (or the best achievable given the cavity width). Our installations are carried out under appropriate Competent Person Schemes.

Get a Free Survey in Coventry

Book a free, no-obligation survey. We serve Coventry, Nuneaton, Leamington Spa, Kenilworth, Warwickshire, Redditch, Rugby and the wider West Midlands.

Frequently Asked Questions

Our Other Services

Loft Insulation

The most cost-effective upgrade for your home

Warm Roof Insulation

Insulation at rafter level for habitable loft spaces

Ceiling Insulation

For flat roofs and garages

Floor Insulation

Eliminate cold floors and draughts

ProPERLA Masonry Creme

Invisible waterproof protection for your walls

Waste Removal

Licensed, responsible, eco-friendly disposal