How Does Cavity Wall Insulation Work?
- Riverstone Real
- 3 days ago
- 2 min read
Cavity wall insulation involves filling the gap (the “cavity”) between the inner and outer walls of your home with insulating material.
Most homes built after the 1920s have cavity walls. Without insulation, this gap allows heat to escape, meaning your boiler or heating system has to work harder — costing you more money.
By insulating the cavity, heat is trapped inside your home, keeping rooms warmer for longer.
The installation process is quick, non-disruptive, and usually completed within a few hours.
Here is how it works:
Small holes are drilled into the external wall
Insulating material (such as mineral wool or polystyrene beads) is injected into the cavity
The holes are sealed to match the existing brickwork
Once installed, the insulation creates a thermal barrier that reduces heat loss through your walls, which is one of the biggest sources of energy waste in UK homes.
Cavity Wall Insulation Available Under the Great British Insulation Scheme
Rising energy bills and heat loss are major concerns for UK households — and the good news is that it may be free or heavily subsidised under the Great British Insulation Scheme (GBIS).
At Energius, we help homeowners and tenants access government-backed insulation grants to make homes warmer, greener, and cheaper to run.
What Are the Benefits of Cavity Wall Insulation?
🔥 Keep Your Home Warmer
Insulated cavity walls help maintain a stable indoor temperature, reducing cold spots and drafts.
💷 Lower Energy Bills
By reducing heat loss, your heating system doesn’t need to work as hard. This can lead to significant savings on gas or electricity bills.
🌍 Reduce Your Carbon Footprint
Using less energy means fewer carbon emissions — helping the UK move towards net zero.
🏠 Improve EPC Rating
Cavity wall insulation can help improve your home’s Energy Performance Certificate (EPC) rating, which is beneficial for homeowners and landlords.
🛠 Quick & Long-Lasting Solution
Once installed, cavity wall insulation can last 25 years or more with minimal maintenance.
Check Your Eligibility Today
If your home has cavity walls and hasn’t been insulated before, you could be missing out on hundreds of pounds in energy savings every year.
👉 Contact Energius today for a free, no-obligation eligibility check and find out if you qualify for cavity wall insulation under the Great British Insulation Scheme.
