Cavity Wall Insulation

Installing cavity wall insulation is one of the most effective ways to make your home warmer, more energy-efficient, and environmentally friendly. Many UK homes lose up to a third of their heat through uninsulated walls, meaning higher energy bills and less comfort.

By filling the gap between your property’s inner and outer walls with insulating material, cavity wall insulation significantly reduces heat loss and helps keep warmth inside your home. The result is a more comfortable living environment and lower heating costs all year round.

What Is Cavity Wall Insulation?

Most homes built after the 1920s were constructed with cavity walls, which are made up of two layers of brick or block with a small air gap (the cavity) between them. This gap can be filled with insulation material, such as mineral wool, polystyrene beads, or foam, to stop heat from escaping.

How it works

The insulating material is injected into the wall cavity through small holes drilled in the outer wall. Once the material fills the space, the holes are sealed, leaving the exterior appearance of your property unchanged.

Once installed, the insulation acts as a thermal barrier, reducing heat transfer between the inside and outside of your home. This helps keep your property warmer in the winter and cooler in the summer, improving comfort throughout the year.

Modern insulation materials are designed to last for decades without the need for maintenance. They are moisture resistant, safe, and compliant with current building standards.

If your property has uninsulated cavity walls, installing insulation can make an immediate and noticeable difference to your comfort levels and energy consumption.

How Cavity Wall Insulation Improves Energy Efficiency

Cavity wall insulation is one of the most cost-effective energy upgrades available. Without insulation, your home constantly loses heat through its walls, forcing your boiler or heating system to work harder to maintain a comfortable temperature. This leads to higher energy use and more carbon emissions.

When your walls are insulated, heat is retained for much longer. The difference can be dramatic – you’ll find your home stays warm even after the heating is turned off, and rooms reach the desired temperature much faster.

The main ways cavity wall insulation improves energy efficiency include:

• Reduced heat loss: The insulation acts as a barrier, keeping warm air inside your home.
• Lower energy bills: By improving heat retention, you’ll use less energy to maintain comfort, cutting costs each month.
• Stable indoor temperature: Your home stays consistently warm during winter and pleasantly cool in summer.
• Less strain on heating systems: Boilers and heat pumps run more efficiently, extending their lifespan.
• Environmental benefits: Lower energy use means fewer carbon emissions, supporting the UK’s journey to net zero.

With energy prices rising, cavity wall insulation is an investment that pays for itself quickly, often within a few years through reduced bills and improved efficiency.

Who Can Qualify for Cavity Wall Insulation Grants?

Through the government’s ECO4 scheme, many households can access funding to help cover the cost of installing cavity wall insulation. This initiative is designed to improve the energy efficiency of homes, particularly for those who are vulnerable to high energy costs or live in properties with poor insulation.

You may qualify for ECO4 support if you:

• Receive certain benefits or tax credits (for example, Universal Credit, Child Tax Credit, Pension Credit, or Income Support).
• Have a low household income (typically under £31,000 per year).
• Live in a home with a low Energy Performance Certificate (EPC) rating of E, F, or G.
• Own or privately rent a property that does not yet have cavity wall insulation.

Flexible eligibility is also available under some local authority schemes, meaning that even if you don’t meet the full criteria, you could still qualify based on your home’s condition and energy use.

At Green Homes Group, our team will:

1. Check your eligibility for free.
2. Explain what funding options are available.
3. Handle the application process on your behalf.
4. Connect you with a trusted, approved installer if your application is successful.

Our aim is to make improving your home’s energy efficiency straightforward and affordable.

Why Choose Green Homes Group?

At Green Homes Group, we specialise in helping homeowners and tenants access energy-saving improvements through government-backed initiatives. Our goal is to make the process simple, transparent, and stress free.

We’re not installers – we’re independent assessors. That means our advice is completely impartial and based solely on what’s right for your home.

Here’s what sets us apart:

1. Expertise You Can Trust

Our assessors have extensive experience in home energy efficiency. We use modern techniques to assess your property accurately and provide clear recommendations.

2. Independent, Honest Advice

Because we don’t carry out installations ourselves, we can give you objective, fact-based advice without any sales pressure.

3. ECO4 Scheme Guidance

We understand the government funding process and will guide you through every step. Our team handles the paperwork, ensuring your application is complete and compliant.

4. Trusted Network of Installers

If you qualify, we’ll connect you with a reliable installer from our approved network. Each partner is vetted for professionalism, quality, and compliance with ECO4 standards.

5. Full Support from Start to Finish

From your first enquiry to post-assessment advice, we’ll support you at every stage. Our process is designed to give you confidence and clarity from beginning to end.

What to Expect During a Survey

Our cavity wall insulation survey is straightforward, non-intrusive, and designed to give you a complete understanding of your property’s energy performance. Here’s what happens when you book an assessment with Green Homes Group:

• Initial Consultation: We start with a short discussion about your home, your heating system, and any energy concerns you have. This helps us understand whether cavity wall insulation is suitable for your property.
• On-Site Survey: One of our qualified assessors visits your home to carry out a detailed inspection. They’ll check the type of walls your property has, look for any existing insulation, and identify potential issues such as dampness or structural cracks.
• Funding and Eligibility Review: We’ll explain whether you qualify for ECO4 or other grants and outline what funding support could be available to help with installation.
• Detailed Recommendations: After your survey, we’ll provide a full report showing:
  • Your home’s current energy efficiency.
  • The expected improvement from cavity wall insulation.
  • Potential cost savings on your energy bills.
  • Next steps for funding and installation
• Installer Connection: If you decide to proceed, we’ll introduce you to a trusted installer from our network who will complete the work professionally and safely.

Our process is designed to make improving your home as simple and stress free as possible.

Benefits of Installing Cavity Wall Insulation

Installing cavity wall insulation offers a range of financial, comfort, and environmental benefits that you’ll notice immediately and over time:

1. Lower Energy Bills

Insulated walls prevent up to a third of your home’s heat from escaping, helping you save money each month on your heating costs.

2. Greater Comfort All Year Round

Your home will stay warmer in winter and cooler in summer, creating a more pleasant and stable indoor environment.

3. Improved Property Value

Energy-efficient homes are more attractive to buyers and tenants. Cavity wall insulation can increase your home’s EPC rating and overall market value.

4. Quick Installation and Long-Term Results

Installation is fast and non-disruptive – most homes can be insulated within a few hours – and the benefits last for decades.

5. Environmental Sustainability

By reducing the energy you use, you’ll lower your household’s carbon footprint and contribute to a cleaner, greener future.

6. Soundproofing and Reduced Damp

Insulated walls also reduce outside noise and help maintain a balanced indoor temperature, minimising condensation and damp risk when installed correctly.

Book Your Free Cavity Wall Insulation Assessment

If you’re ready to improve your home’s energy efficiency, our team at Green Homes Group can help.

We’ll provide a free, no-obligation assessment to check your property’s suitability for cavity wall insulation, review your eligibility for ECO4 funding, and explain the next steps clearly and simply.

Our role is to make the process smooth from start to finish, giving you the confidence to make an informed decision.

Book your free assessment today and take the first step towards a warmer, more efficient, and environmentally friendly home.

Frequently Asked Questions on Cavity Wall Insulation

1. How do I know if my home has cavity walls?

Most homes built after 1920 have cavity walls. You can usually tell by the brick pattern – if all bricks are laid lengthways (known as a stretcher bond), your home likely has cavity walls.

2. Will cavity wall insulation cause damp?

When installed correctly, cavity wall insulation should not cause damp. Our survey identifies any issues such as cracks or leaks before installation to ensure your home is suitable.

3. How long does cavity wall insulation last?

Modern insulation materials are designed to last the lifetime of your property, typically over 25 years.

4. How long does installation take?

Most properties can be insulated in just a few hours, depending on size and access.

5. Can I get funding for cavity wall insulation?

Yes. Many households qualify for support through the ECO4 scheme, which can cover some or all of the costs. We’ll check your eligibility as part of your free assessment.

Reach Out Today

Make your home warmer, reduce your bills, and improve your energy efficiency with cavity wall insulation.

Use our quick enquiry form to book your free survey today. Our team will review your property, check your eligibility for funding, and help you take the next step towards a more comfortable, energy-efficient home.

With Green Homes Group, the process is simple, transparent, and fully supported from start to finish.