Cavity Wall Extraction

Extract, remove and replace your ineffective cavity wall insulation with our cavity wall extraction service.

What is Cavity Wall Extraction?

Cavity wall extraction is exactly what it says on the tin. It is the process of extracting and removing the insulation from inside the cavities of your external wall. Using a process of pumping compressed air to push the insulation to the bottom and using a specialist vacuum to collect all of the fallen material.

Cavity wall extraction requires specialist equipment and knowledge to successfully remove the unwanted insulation from inside your walls.

Cavity Wall Extraction

Why Should You Remove Your Ineffective Cavity Wall Insulation?

Save Money

Save Money

Up to 35% of your property's heat escapes through the walls. Therefore, by removing ineffective insulation and having it replaced, you can take advantage of this benefit and save money on your energy bills.

Wall Damage

Wall Damage

Wall damage from harsh weather conidition and certain property locations (ie. costal) can corrupt your cavity wall's insulation. Overtime your external walls can become extremely damaged from the inside out.


Insulation Standards

Your cavity wall insulation may not be up to standards and regulations. With now over 13 million homes in Britain that have cavity wall insulation, a lot of properties do not meet new standards set by KIWA and BBA.

Cavity Wall Extraction Process

Cavity Wall Removal Process

  1. Compressed air line inserted into cavity wall
  2. Flexible suction vacuum attached by removing a single brick, below the airline to collect fallen insulation
  3. Air line pushes compressed air into the wall, breaking up insulation and directing it towards the suction nozzle below
  4. Damaged insulation material safely extracted from the cavity
  5. Vacuum and air line removed
  6. Holes and gaps in wall restored
  7. Entire project takes an around 2 days for an average 3-bedroom detached property

How to Tell if Your Wall Insulation Needs Repalcing?

High energy bills.

The area has flooding.

Not retaining heat well.

Cold exterior walls.

Damp areas on and around the wall.

Damage to exterior walls.

Unhappy with current insulation work.

Exterior wall has cold spots.

What Materials can we Extract from your Caviy Wall?


Expanded Polystyrene


Foam Insulation


Rockwool Mineral Fibre


Glass Mineral Fibre

Checkout our Cavity Wall Insulation Service


  • How can I know if my insulation has a problem?

  • There are certain indicators you can look out for to know if your cavity wall insulation may be ineffective and damaged. For example, if your energy bills are unusually high, higher than normal, or if there are cold spots and damp areas around the wall. These can all be indicators. For more information about cavity wall extraction you can see our latest article here.
  • What issues do damp walls lead to?

  • If your insulation and walls become damp, then your thermal resistance will be greatly weakened. Your insulation will become ineffective and you will start to see your energy bills get higher and your rooms become colder throughout winter.
  • How much can I save with effective cavity wall insulation?

  • Well, the fact that having a well-insulated cavity wall means you can reduce heat loss by up to 35%, making sure your insulation is still effective is quite important. Walls lose the most heat out of all areas of a property or a home, therefore, they need to be very well-insulated for you to start saving money on heating bills and to reduce your co2 emissions.
  • What can happen to my property with the wrong cavity wall insulation?

  • If your cavity wall has been installed with the incorrect or a low-quality insulantion material, then it can slump and effective the strucutre. Your thermal resistance will be ineffective, the wall will be cold and condensation and mould may form. Decorative surfaces can start to peel, stain and flake off. Your property also may begin to smell as the dampness spreads, creating a perfect breeding ground for black mould, eventually deteriorating your structure and weakening the building.
  • What types of properties can benefit from cavity wall insulation?

  • You can benefit from cavity wall insulation if your exterior walls have a cavity greater than 50mm, greating a perfect area to be insulated. Depending on the property's location, specific insulation may need to be issued to best combat against the climate and sorrounding conditions. You can learn more about our cavity wall insulation serivce here.