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The Company

Cornwall Wall Insulation Limited (CWI), is an established Cornish company based in Redruth offering External Wall Insulation throughout Cornwall and parts of Devon who is an approved installer for the Green Deal Scheme. With over 10 years of experience in the construction industry we offer a professional and high quality service.

CWI is a specialised team of plasterers and renderers with expertise and training in monocouche renders and synthetic finishes as well as traditional products. CWI have a wealth of experience in the installation of external wall insulation for projects ranging from large social housing estates, Schools, Commercial installs to one off projects for private house owners. We are able to install systems by all major system providers including Rockwool, Weber, Wetherby, SAS and Alumasc.  

Benefits of External Wall Insulation

With external wall insulation you can benefit from:
  • Improving thermal efficiency by minimising heat loss
  • Revitalised appearance of your home with a weather proof and durable façade
  • No internal living space is lost and there is minimal disruption to the household
  • Elimination of the risk of condensation within the wall structure and thermal bridging.
  • Reduced sound transmission
  • Reduced heating bills
  • Can help prevent damp
  • Helps to reduce draughts

Improves Efficiency

External Wall Insulation is an effective way of improving your homes energy efficiency creating a warm living environment. It is suitable for most types of homes but particularly for:

  • Single block or solid wall construction
  • Homes prone to damp and cold wall
  • Mundic block construction
  • Cornish units
  • Or where cavity wall insulation is not appropriate


For more information on the types of external wall insulation and our services please see our products page

To view some of our  recent projects please see our gallery page


The Green Deal

Cornwall Wall Insulation Ltd is a approved Green Deal Installer for external wall insulation systems.

Follow this link to understand more about the Green Deal, how it works and whether it is right for you.

Installer *

Reg. No.07389584

* External Wall Insulation Systems