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The Complete Guide To What You Need To Know About Cavity Wall Insulation

The Complete Guide To What You Need To Know About Cavity Wall Insulation

What's Cavity Wall Insulation?

Briefly, Cavity Wall Insulation is the insulation which sits in the cavity between your inner and outer wall.

Do I need Cavity Wall Insulation?

That's extremely difficult to say without looking at your house. But there are a few tell-tale signs which you can use to determine if you potentially need it. So put your Sherlock Holmes hat on and look out for these clues.

Firstly, any home built between the 1920s and 1980s usually has cavity walls which need filling with insulation. However, there was a big push in the 2000s to fill these cavities with insulation so you may already have it without knowing it.

Now, if you don't know how old your house then look at the brick work outside. If the bricks are all the same size then it's likely you have cavity walls. Older houses were built in a different style and have bricks of differing size on display. And they don't usually have a cavity in their walls.

The second clue as to whether you need Cavity Wall Insulation is to check the outer walls for any disturbance or holes in the mortar between the bricks. These holes or disurbances are not the work of a deranged woodpecker. They are the leftover marks from workmen who drilled through the mortar and injected the insulation.

How Does Cavity Wall Insulation Work?

A layer of material is injected into the cavity in your walls to help heat stay in your house. Much the same as you wear clothes to keep the air trapped on your body.

How Long Does It Take To Install?

Not long at all. A standard 3 bed semi-detached can be done in as little as two to three hours. You don’t even need to be at home when it’s done for you if you don't wish to be.

What Are The Benefits Of Cavity Wall Insulation?

As mentioned above, the main benefit is that it will keep your house warmer. Equally, it will mean lower energy costs because the heat is trapped in your home better, so you’re not spending vast sums to heat your house.

The cost of the Cavity Wall Insulation will pay for itself within three to four years, or probably less if the energy costs keep rising. Therefore, you should be considering getting it done as soon as possible so you can start saving sooner.

Equally, the material of the Cavity Wall Insulation will last for around 25 years so it’ll deliver a great return on your investment.

As ever, the less energy you use to heat your home means a lower carbon footprint. So you're doing your bit to help the planet too.

What Is Cavity Wall Insulation Made From?

If you’re having it pumped in through small holes in the mortar it’ll be very similar to expanding foam in nature. Occasionally, you can get polystyrene granules mixed with adhesive but it isn’t as common. Either option will work well though.

How Much Does It Cost To Install?

Unfortunately that’s difficult to say without knowing the full scope of the project. But we’ll happily give you a free quote at a time which is convenient to you if you'd like one.


Cavity Wall Insulation is a relatively cheap upgrade for your home and will ensure cheaper energy bills and a warmer house for a long period of time. They also reduce your carbon footprint.

As such, it’s easy to say that if you don’t already have any Cavity Wall Insulation then it’s definitely worth considering investing in it.

And, by the way, if you are interested in getting it for your home then give us a call today to get your free, no obligation quote. We’ll come at a time convenient to you. And we offer extremely competitive prices as well as courteous and professional workers who'll do a great job. They'll even clean up after themselves too.

So make sure to give us a call today.

Categories: Construction


To discuss your project, call 0208 706 0860 or

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