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Cavity wall insulation – Pine Grove

 

Many homes built after 1920 have external walls made of two layers of brick or block with a gap (cavity) between them. This gap can let heat escape.

By filling the cavity with insulation, your home will keep more heat in and reduce energy bills.

Note: Existing insulation can degrade over time which is why it needed to be replaced.

 

FAQs – Cavity wall insulation

If you’ve been offered the opportunity to have cavity wall insulation installed at your home, these FAQs should answer any questions you may have.

1.Survey

A surveyor will check:

  • If you have cavity walls
  • The condition of any existing insulation
  • For damp or cracks that could affect the work

2. Installation

Small holes (about 22mm) will be drilled into the external mortar joints in a set pattern.

Existing insulation will be extracted using specialist equipment.

New insulation (usually polystyrene beads) will be blown into the cavity until full.

3. Finishing

Drill holes will be refilled with colour-matched mortar.

These will blend in after weathering and will not be visible once external wall insulation is installed.

Yes:

Move garden furniture, plants, ornaments, and sheds away from walls (at least 4 meters).

Move vehicles or caravans and cut back bushes/trees if asked.

Remove items like hanging baskets near walls.

If you can’t move items, Sureserve may help, but they can’t be responsible for damage if preparation isn’t done.

Minimal:

You do not need to move out.

There will be some drilling noise and dust during extraction and installation.

A vacuum machine will remove old insulation—this can be noisy and may create some dust inside.

Pets may find the noise stressful—keep them supervised.

Materials may be stored in your garden temporarily.

The contractor will keep mess and disruption to a minimum and update you regularly.

Usually 2–3 days, depending on: 

  • Property type 
  • Weather 
  • Any extra structural work needed 

The contractor will keep you informed. 

The Changeworks Quality Assurance team will carry out independent inspections on all properties. They will ensure the work is of a high standard and to the approved specification.

All cavity wall installations are covered by the Cavity Insulation Guarantee Agency (CIGA) or an equivalent agency.
This provides an independent 25-year guarantee for insulation fitted by registered installers in the UK and Channel Islands.

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Energy bills and your supplier

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Financial support

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Templates for writing to your energy supplier

We’ve put together several templates to help you write to your energy supplier. The templates cover common energy supply issues and can be used for emails, webchats, or letters.

Get a retrofit

If you’re thinking of retrofitting your home to make it more energy efficient, Changeworks has a number of funded and self-funded options available.