Insulation
Cavity Wall Insulation
Helping homes built with cavity walls retain more heat, quietly, quickly and with minimal disruption.
At a glance
Why people enquire
- Warmer rooms, especially against external walls
- Reduced heat loss through external walls
- Less demand on your heating, which can lower energy use
- Potential improvement in EPC rating
- Fast installation with minimal disruption
Many homes built after the 1920s have a small gap, or cavity, between two layers of external brick. When this cavity is left empty, valuable heat can escape through the walls. Cavity wall insulation fills that gap with insulating material, helping rooms feel warmer and reducing the demand on your heating system.
Benefits
- Warmer rooms, especially against external walls
- Reduced heat loss through external walls
- Less demand on your heating, which can lower energy use
- Potential improvement in EPC rating
- Fast installation with minimal disruption
Is it suitable for your home?
- Homes typically built after the 1920s with cavity walls
- Two layers of brick (or brick and block) with a visible gap
- Walls in good general condition with no significant damp issues
- Properties not previously filled with cavity insulation
How it works
01
Friendly conversation
Tell us about your home and what you'd like to improve.
02
Property assessment
We discuss what may suit your property and circumstances.
03
Survey if appropriate
A surveyor confirms suitability and technical details.
04
Clear next steps
You receive straightforward guidance and ongoing support.
Funding & scheme context
Schemes can change. We help you understand the picture.
Cavity wall insulation has historically been supported through schemes like ECO4 and the Great British Insulation Scheme (GBIS) for eligible households. The Warm Homes Plan is also expected to consider insulation as part of wider home upgrades. We can talk you through what may apply to your home today.
Eligibility and availability depend on current scheme rules, property circumstances and household details. Emerald Green Energy does not guarantee funding.
Why choose Emerald Green Energy
Friendly UK-based team that listens before recommending anything.
Experience across insulation, heating and renewables.
Clear, no-pressure guidance from first contact to completion.
Recommendations tailored to your property, not a script.
Aware of how government-backed schemes actually work in practice.
Focused on warmer, more comfortable homes, not pushy sales.
Frequently asked questions
For a typical home, installation can often be completed in a few hours, with minimal disruption inside the property.
When properly assessed and installed in a suitable property, cavity wall insulation should not cause damp. A survey checks suitability before any work proceeds.
Support may be available via government-backed schemes for eligible households. Eligibility depends on current rules and your property circumstances, contact our team to discuss.
Ready to talk about your home?
Whether you're exploring insulation, heating, solar or future scheme support, our team is here to help.