Cavity Wall Insulation
Fill the gap in your walls and dramatically reduce heat loss. One of the most effective ways to make your home energy efficient across Wales and South West England.
Serving Swansea, Cardiff, Neath, Bridgend, Bristol, Bath, and surrounding areas
How Cavity Wall Insulation Works
Most homes built after the 1920s have cavity walls—two layers of brick or block with a gap between them. That gap was originally for damp protection, but it also lets heat escape.
We inject BBA-certified insulation material into that cavity through small holes drilled in the outer wall. The holes are then filled and matched to your existing mortar—you'll barely notice they were there. Our TrustMark certified teams cover all of Wales and South West England.
What's Included:
- Full wall survey using borescope inspection
- Cavity width and condition assessment
- Professional injection of insulation material
- Drilling holes filled and colour-matched
- BBA-certified insulation materials
- 25-year guarantee on workmanship
- Full compliance documentation
Is Your Home Suitable?
Not all properties are suitable. We'll assess:
- Whether your walls have a cavity (most post-1920s homes do)
- Cavity width—minimum 50mm required
- Wall condition and any existing damage
- Exposure to driving rain
- Any previous failed insulation attempts
Up to 35% Heat Savings
Uninsulated walls can account for over a third of your home's heat loss.
Quick Installation
Most cavity wall jobs are completed in just 2-3 hours.
No Internal Disruption
Insulation is injected from outside—no mess inside your home.
Immediate Comfort
Rooms feel warmer and more comfortable straight away.
Free for Many Homeowners in Wales & South West England
Cavity wall insulation is commonly funded through ECO4 grants. If you're on certain benefits or have a household income under £31,000, you may qualify for free installation. ECO4 has been extended to December 2026 — check your eligibility today.
Check Your Eligibility