Cavity Wall Insulation

A Simple Upgrade for a Warmer, More Energy-Efficient Home

Cavity Wall Insulation If your home was built between the 1920s and the early 2000s, there’s a good chance it could be eligible for cavity wall insulation — two layers of brick or blockwork with a gap (or “cavity”) between them. While this design helps reduce rain penetration, the empty space can also let valuable heat escape, especially in colder months.

Cavity wall insulation is a proven, cost-effective way to boost your home’s comfort and cut heating bills. By filling the gap with high-performance insulating material, you create a thermal barrier that keeps heat inside during winter and helps maintain a cooler environment in summer.

We only offer this insulation method as part of our One Stop Shop Service.

How It Works

Energlaze installs cavity wall insulation by injecting specialised insulating beads or foam into the cavity through small, strategically placed holes in the exterior walls. This process is quick, clean, and typically completed in a single day — with minimal disruption to your home.

The Benefits of Cavity Wall Insulation

  • Lower Energy Bills – Reduce heat loss by up to 35%, meaning you use less energy to keep your home warm.

  • Year-Round Comfort – Keeps your home warmer in winter and cooler in summer.

  • Fast Installation – Most homes are completed in less than a day.

  • SEAI Grant Support – Eligible homes can avail of government grants under the SEAI Home Energy Upgrade scheme.

  • Environmentally Friendly – Reduced energy use means lower CO₂ emissions.

SEAI Grants for Cavity Wall Insulation

Under the SEAI Home Energy Upgrade programme, cavity insulation is available as part of a multi-upgrade project. This means you can combine it with measures such as attic insulation, window upgrades, or renewable heating systems for maximum impact.

Energlaze is an SEAI-registered One Stop Shop, meaning we manage the entire grant application and installation process for you.

Cavity Wall insulation is a very effective way to insulate your home. We only offer this measure as part of our one stop shop services and do not offer it as a single or stand alone insulation measure.

Most homes built after the 1920s in Ireland have cavity walls. A quick way to check is by looking at the brick pattern — uniform brickwork usually indicates a cavity wall. A survey by an Energlaze specialist can confirm.

Yes. It can reduce heat loss by up to 35%, which can translate to significant annual savings depending on your energy usage.

Energlaze uses high-performance insulating beads or foam designed for maximum efficiency, durability, and moisture resistance.

No. The injection holes are small and are carefully filled and colour-matched to your exterior finish.

Yes. It slows heat transfer both ways, keeping your home cooler in summer and warmer in winter.

Grants are available for cavity wall insulation as part of a multi-upgrade project. Energlaze can check your eligibility and manage the application for you.

No. When installed correctly using the right materials, cavity wall insulation will not cause damp. Energlaze carries out a thorough survey to ensure suitability before installation.

High-quality insulation can last for the lifetime of the building without significant deterioration.

Simply contact Energlaze to arrange a home survey. We’ll assess your walls, discuss your options, and provide a free, no-obligation quotation.


Simply contact Energlaze to arrange a home survey. We’ll assess your walls, discuss your options, and provide a free, no-obligation quotation.

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