Remove and Refill Cavity Wall Insulation
Extracting cavity wall insulation from a home

Cavity Wall Extraction

Removing and replacing cavity insulation

Cavity wall insulation is a great way to save money on your energy bills, prevent heat from escaping through your walls, and keep your home warmer in winter and cooler in the summer.

The effectiveness of cavity wall insulation is emphasised by being included as a primary measure in government energy efficiency initiatives, including the Energy Company Obligation which is designed to provide low-cost and free insulation to suitable and qualifying households, helping to reduce carbon emissions and tackle fuel poverty.

There are instances, however, where householders require the cavity wall insulation to be removed, as it is deemed to be defective.

If you are experiencing problems with existing insulation that has been installed without an appropriate industry-backed guarantee, the good news is that we are able to assess your insulation, and property suitability and customise a solution that is best for your home.


There may be a number of reasons why you may need your cavity wall insulation replaced:

  • Incorrectly installed insulation which is producing cold or damp spots within the building fabric.
  • Defective insulation
  • Insulation becoming wet through poorly maintained properties
  • Insulation becomes wet through flooding or fire damage.
  • Leaking roof

Should the existing cavity insulation be removed?

There are a couple of ways of finding out if there are any problems with your insulation. This can be as simple as looking around the property for poorly maintained brickwork or patches of insulation exposed to the elements (possibly via the roof).

We also have some really great tools that allow us to review the insulation. A borescope inspection is a fairly quick and easy way to determine the type of insulation used and how it’s performing. We can gather photographic evidence from around the property to understand where any problems may be occurring.

Thermal imaging is another tool that helps diagnose areas of the property that may be losing heat and also provide a map of where any cavity insulation may be failing.

Why would you remove cavity wall insulation?

The cavity may have been insulated when unsuitable previously due to having an existing damp problem, poor maintenance, or perhaps the material used wasn’t the appropriate solution for the cavity, these are examples to name but a few.

Do you need more information?

Frequently asked questions

How do you remove cavity wall insulation?

Compressed air is blown into the cavity while an industrial vacuum collects the damaged insulation, rubble and debris – providing a full cavity clean.

Is there much mess?

The cavity wall insulation material is removed as cleanly as possible and with minimal fuss.  The old insulation is bagged up and safely disposed of.

How long does it take to remove the insulation from my walls?

Depending on the size of your property, your cavity wall insulation can usually be removed within two days, for example, for a 3-bedroom semi-detached house.

After removal, can you refill it with new insulation?

Yes, we can but only if the property is suitable in accordance with industry best practice. We currently install a bonded bead product, which is a system of cavity wall insulation that has been tested, assessed, and approved by the British Board of Agrement (BBA) and KIWA.

Watch this video from Thermabead, the manufacturer of the bonded bead product, which demonstrates the benefits.

Are your installers employed by you?

Our cavity wall extraction teams are all employed by us and trained to the highest standards.

How much does cavity wall insulation extraction cost?

Given there are many reasons to why cavity wall insulation would need to be extracted and the variable costs to treat them, we would need to assess your property individually and quote accordingly.

Get a FREE Survey!

0800 833 018