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What is external wall insulation?

When a property has no cavity space to insulate, such as solid wall and hard to treat cavity, an alternative would be to insulate the walls using external wall insulation.

External wall insulation consists of a layer of insulation such as EPS Board, PUR Board, Mineral Fibre, Wood Fibre or Hemp Batts. EPS being the most common solution. The Insulation layer is mechanical fixed (Adhesive is used if required) to the existing walls which is then rendered over incorporating a mesh for added strength.

There are various finishes which then can be applied to the render, Silicone, Brick Effect, Brick Slips and Spar Dash are the most common used.

Pictures courtesy of Wetherby Building Systems Ltd

What is the difference is between solid wall and a cavity wall?  

Solid walls  have no gap, so they can’t be filled with cavity wall insulation. 

Cavity walls  are made of two layers with a gap or ‘cavity’ between them. 

What are the benefits?

The benefits of externally insulation your property are:-

  • Insulating the property externally will reduce Energy Losses from the heating
  • As Energy Losses are lowered, energy bill will be lowered
  • It can also improve sound transfer, such as Road noise
  • It will improve weather resistant to the property, increasing the life of the walls
  • It can improve the appearance of the property
  • Reduce air leakage of the property
  • It reduces condensation on the walls
  • Will not decrease the room sizes like internal wall insulation
  • Can be installed with minimal disruption to the household.

Would it work for my home?

External wall insulation can be installed to most homes, though the following would need to be considered.

  • External wall needs to be structurally sound
  • Roof Eaves & Verges may need to be extended to suit the insulation thickness.
  • There May be loss of some original features of the property
  • Planning Permission may be required subject to local council requirements.
  • May not be suitable for listed buildings or properties in a conversation area.
  • If windows are due to be replaced, it would be benefit to do them at the same time

How much will I save?

The amount you save by having External wall insulation varies depending on the size of your property.
You can typically expect to save between £195 – £650 by having this measure installed.

** Figures based on Ofgem Life time savings

How much will it cost?

This measure can be fitted for free under the Government Grant Scheme.
Please click here to see what funding is available and the eligibility criteria.
If you don’t qualify and would like us to provide you with a bespoke quotation, please get in touch.
Finance options available.

LMF ENERGY SERVICES is a trading name of Live Manage Facilitate Ltd, registered in England and Wales, Company Registration Number – 10006957

LMF ENERGY SERVICES can be found on the FCA register under Firm Registration Number: 945452.

Kandoo is a Trading Style of Switcha Limited which is authorised and regulated by the Financial Conduct Authority, Firm Registration Number: 828963 for Credit Broking and Insurance Distribution.

Switcha Limited is a Credit Broker and not a Lender. You can check this on the Financial Services Register at

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