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Keep the Heat In. Keep the Bills Down.

You may be entitled to a full or partial grant for cavity wall insulation.

Cavity Wall Insulation is one of the most cost-effective ways to improve your home’s energy efficiency — with minimal disruption and immediate impact.

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Why choose Cavity Wall Insulation?

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Instant Comfort

Keeps heat inside and cold air out

Energy Savings

Cut heating costs by up to 25–30% beads

Eco-Friendly

Reduce carbon emissions and improve your BER

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A BlueBuild installer using specialized equipment to inject cavity wall insulation into a property.

A side view of a dark grey BlueBuild flatbed service truck driving on a rural road, with two technicians visible in the cab against a backdrop of rolling green hills and a cloudy blue sky.

A BlueBuild technician wearing a protective respirator mask, safety glasses, red ear defenders, and a high-visibility vest operating a heavy-duty Hilti rotary hammer drill to core an openings in a concrete block wall.

Our Installation Process

Our expert installation is fast, clean, and typically completed in just one day.
Here’s how it works:

We carry out a detailed wall assessment to confirm suitability
Small, discreet holes are drilled in the external wall
High-performance insulation beads are injected to fully fill the cavity
All drill points are carefully sealed to match the original finish

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Northern Ireland Grants for Cavity Wall Insulation

Homeowners in Northern Ireland may be eligible for support through a range of government-backed energy efficiency schemes — helping to reduce or even fully cover the cost of installation.

Available support can include:

NISEP (Northern Ireland Sustainable Energy Programme) – including fully funded options for eligible households
Affordable Warmth Scheme for lower-income homes
Potential support through local council or energy supplier initiatives

Grant levels and eligibility vary depending on your property type, household income, and current energy efficiency rating.

Our team will:

Assess your eligibility during your free survey
Guide you through the most suitable funding options
Handle the application process where applicable

👉 Find out if you qualify for fully funded insulation on our Residential Grants page.

View Residential Grants