Cavity Wall Insulation

Tired of drafty walls and rising heating bills? No worries, Berks Insulation is your one-stop shop for transforming your home's energy efficiency with cavity wall insulation under the ECO4 scheme.

Understand the Cavity Wall

A cavity wall consists of two layers separated by a gap called the cavity. The outer layer is typically made of bricks, while the inner layer can be either bricks or concrete blocks. Houses built after the 1920s usually have this structure known as cavity walls, whereas older homes, predating the 1920s, are more likely to have solid walls—a single, thick layer made of bricks or stone. To identify your wall type, examine the external brickwork. Cavity walls display a uniform brick pattern with all bricks laid lengthways.

Cavity Wall Insulation Basics

Many cavity walls are insulated from the outside by injecting materials. Specialists drill holes, insert insulation (commonly mineral wool or polystyrene beads), and seal them.
To insulate, a registered installer drills small holes of depth 18-25mm on the exterior walls. Using special equipment, they blow insulation into the cavity and fill the holes inconspicuously. Filling cavity walls isn't a DIY task; hire a registered installer. The job takes about two hours for an average house with easily accessible walls, causing minimal disruption.

Costs and Savings

Installation costs vary by home size. Whether a spacious house or a compact flat, you can recoup costs within five years through annual energy bill savings.

Mitigate costs by coordinating work with other home improvements or focusing on specific areas rather than the entire house.

Is cavity wall insulation suitable for your home?

If your house is relatively new, it probably already has insulation. To check, consider these steps:


Ask a registered installer for this. They'll drill a small hole in your external wall to inspect whether the walls are hollow or filled.

Building Control Department

Check with your local authority's building control department for information.

check Epc rating

Here's how Cavity Wall Insulation with Berks Insulation transforms your home

  • Reduced energy bills: Slash your heating costs by up to £515 a year (Energy Saving Trust)! That’s like a free holiday every year!
  • Warmer, cosier home: Say goodbye to chills and hello to snug comfort, all year round.
  • Improved EPC rating: Boost your home’s Energy Performance ratio, making it more attractive to buyers and potentially increasing its value.
  • Eco-friendly: Reduce your carbon footprint and do your bit for the planet.

Your home is suitable for standard cavity wall insulation if it meets these criteria:

  • The external walls are unfilled cavity walls.
  • The cavity is at least 50mm wide and clear of rubble.
  • The masonry or brickwork is in good condition.
  • Walls aren’t exposed to heavy rain.
  • Your home isn’t at risk of flooding.
  • An installer will survey your house to confirm suitability. If suitable, they can be insulated using mineral wool or polystyrene beads.

For houses with narrow or uneven cavities, exposed locations, or flood risks, polyurethane foam may be an option. It’s pricier but highly effective. A specialist foam insulation installer will assess and perform the work if suitable.

Precautions need to be taken by not applying insulation if you have damp patches on internal walls; resolve the issue first with a damp prevention specialist. 

If your home’s exterior walls connect to another house, a cavity barrier will be inserted to prevent affecting your neighbours. 

For flats, insulation typically requires agreement from everyone in the block; individual flat insulation is usually not feasible. 

Why Choose Berks Insulation?

1. Expertise You Can Trust:

  • Our team comprises skilled professionals with extensive experience in Cavity Wall Insulation. We adhere to the latest industry standards and guidelines to provide you with the best service

2. Hassle-Free Process:

  • From assessment to installation, we ensure a smooth and hassle-free experience for our customers. Our experts will guide you through the entire process, addressing any queries you may have.

3.Customer Satisfaction:

  • Our priority is your satisfaction. We strive to exceed your expectations in terms of service quality and customer support.
Explaining Cavity wall insulation plan

Ready to Transform Your Home?

Take the first step towards a more energy-efficient and comfortable home with Berks Insulation. Contact us today to schedule a consultation and explore the benefits of Cavity Wall Insulation under the ECO4 Grant. Let's make your home a beacon of energy efficiency!