Grants for cavity wall insulation can cut energy costs — check if you are eligible in the UK today.
Imagine standing beside an open window on a cold, windy day — feeling that chilly draft sweep in. Now imagine that same heat loss happening through every external wall in your home.
That is essentially what happens when your property doesn't have cavity wall insulation. Think of it as a cosy blanket wrapping around your home, keeping the warmth inside where it belongs.
According to recent figures, only 71% of homes in the UK currently have cavity wall insulation installed — meaning millions of households are missing out on an opportunity to cut energy waste, lower their carbon footprint, and reduce their energy bills.
Three Simple Steps
Getting started with cavity wall insulation is quick and simple. Follow our process to begin your energy upgrade.
Take 60 seconds of your time to fill out the application form.
We'll let you know whether you're eligible for a grant.
Our engineers will be in touch to book a survey and installation date.
If your home was built within the last 70–80 years, there's a good chance your external walls are made of two layers — an inner and an outer wall — with a small gap, or cavity, between them. Cavity wall insulation simply fills that gap with materials such as mineral wool, polystyrene beads, or a specialised insulating foam.
Thanks to updated building regulations, most homes built after 1991 should already have cavity wall insulation installed. But if yours doesn't, there are excellent grants and schemes available to help you get it sorted.
Installers drill small, tidy holes into the outside walls of your home and inject the insulation material into the cavity. This material spreads throughout the space, forming a warm, protective barrier that greatly slows heat loss through your walls — like wrapping your home in a cosy winter coat.
Many homes can benefit from cavity wall insulation, but not every property is the perfect match. Our qualified surveyors will always carry out a full assessment. Here's a quick overview of what we typically look for:
Most homes built between the 1920s and 1980s are likely to have cavity walls and are usually suitable. Older properties — typically pre-1920s — often have solid walls requiring a different approach. Homes built after 1991 generally have insulation already installed.
Your cavity walls should be in good overall condition. If there are structural issues, significant cracks, or existing damp problems, these will need to be resolved first.
Our team needs safe, clear access to all external walls — meaning no major obstructions such as thick bushes, sheds, or conservatories blocking the work areas.
Although our installers are experienced with ladders and scaffolding, extremely tall buildings or homes with awkward access can have limitations. We assess all of this during your survey.
The Great British Insulation Scheme is designed to help more households improve their energy efficiency. Eligibility is usually based on your home's EPC rating (D or lower). If you qualify, you could receive free cavity wall insulation. Our team will explain the available grants, check your eligibility, and guide you through every step of the application.
If your home's a good fit and funding is sorted, here's what to expect during the installation.
We begin with a thorough assessment of your home to confirm that cavity wall insulation is suitable. During this survey, we identify any potential issues and determine the best installation approach for your property.
Small holes — around 22–25mm — are drilled into the outer walls to access the cavity. These are typically placed in the mortar joints rather than the bricks themselves, helping to keep the finish neat and unobtrusive.
Using specialist equipment, our installers inject the selected insulation material — whether mineral wool, beads, or foam — into the cavity through the drilled holes, ensuring complete and even coverage throughout the wall.
Once the cavity is fully filled, all drilled holes are carefully sealed using mortar that is closely colour-matched to your existing walls, helping the finish blend in as naturally as possible.
We make sure your home is left clean and tidy. Our team will remove any debris and ensure the surrounding area looks just as good as when we arrived.
Every cavity wall insulation installation comes with a comprehensive guarantee. As a Qualitymark-accredited provider, your installation is protected with a 25-year guarantee for complete peace of mind.
