Cavity wall insulation grants: You could save energy and money.

Imagine standing next to an open window on a chilly, blustery day, feeling that unwelcome draft. Now, picture that heat loss happening across every external wall in your home.

That’s often what’s going on if you don’t have cavity wall insulation. Think of cavity wall insulation like a big, snug blanket, gently wrapping your walls to keep the warmth where it belongs, inside your home!

Recent reports from the Department for Energy Security & Net Zero (DESNZ) tell us that only 71% of properties in the United Kingdom currently have cavity wall insulation installed. That means millions of homes are missing out on a chance to reduce their carbon footprint, save energy, and maybe chip away at their energy bills.¹ We’ve put together an easy guide to explain what cavity wall insulation is all about, and how you can take those simple, tangible next steps to make your home a little more sustainable, all while saving energy, time, and potentially money. Let’s explore!

What is cavity wall insulation?

If your home was built in the last 70 or 80 years, chances are your external walls are made of two "skins" – an inside and an outside wall – with a handy little gap, or cavity, in between them. Cavity wall insulation is simply about filling that gap with insulating materials like shredded mineral wool (a bit like fluffy glass fibre), polystyrene beads, or a special insulating foam.

It's good to know that, thanks to a building regulation change, homes built after 1991 should already have cavity wall insulation. But the good news is, if yours doesn't, there are of grants and schemes available to help you.

Now, how does cavity wall insulation work its magic? We simply fill that gap. Imagine our friendly installers carefully drilling small, neat holes into the outside walls of your home. Through these holes, they gently inject the insulation material. This material then fills the space, creating a cosy barrier that significantly slows down the rate at which heat can escape through your walls. It’s a bit like giving your home a wonderfully warm winter coat! The insulation doesn’t stop your heating from doing its job, it just helps it do it better, so you can stay comfortable using less energy.

Is my home suitable for cavity wall insulation?

While many homes can benefit, not every property is a perfect fit. Our experienced surveyors will always give your home a thorough check-up, but here's a little heads-up on what we generally look for:

Wall type.

Most homes built between the 1920s and 1980s are likely to have cavity walls and be suitable. If your home is older, say pre-1920s, it's more likely to have solid walls, which require a different type of insulation. Newer homes (post-1991) usually have insulation already built into the cavity.

Wall condition.

Cavity walls should be in good condition. If there are signs of structural issues, extensive cracks, or existing damp problems, we'll need to address those first. Our insulation needs a stable, dry environment to do its best work and last for years to come.

Accessibility.

Our team needs safe and clear access to all external walls of your home to properly install the insulation. This usually means ensuring there are no major obstructions like overgrown bushes, sheds, or conservatories that would prevent us from reaching every part of the cavity.

Height restrictions.

While we're pretty good with ladders and scaffolding, there can sometimes be height limitations, especially for very tall buildings or those with tricky access points. But don't worry, we'll assess all of this during our survey.

Cavity wall insulation grants and funding.

We understand that investing in home improvements can feel like a big outlay, but there are some fantastic grants and funding options out there that could significantly reduce, or even cover, the cost of your cavity wall insulation.

The Great British Insulation Scheme (GBIS).

The Great British Insulation Scheme (GBIS) is designed to help a wide range of households improve their home's energy efficiency. The eligibility criteria usually relates to your homes EPC rating, which has to be D or lower. If you are eligible for the grant, you could get your cavity wall insulation for free.^ It's all about making warmer, more affordable homes a reality for more people.

We're dedicated to making this process as smooth and straightforward as possible for you. Our team of experts can help you understand the various grants available, check your eligibility, and even guide you through the application process. We're here to help you unlock those potential savings!

Ready to find out if you could get help with the cost?

It only takes a few moments to check your eligibility for grants. Take the first step today and see what support might be waiting for you.

Cavity wall FAQs.