Keeping your home warm / heating / energy crisis / insulation etc

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user16171
We are down in Lewes, East Sussex.
I think we will go with cavitech-uk.com.

For docs and certs, ChatGPT suggests
1. CIGA Guarantee: The Cavity Insulation Guarantee Agency (CIGA) provides a 25-year guarantee for cavity wall insulation. Ensure that the contractor is registered with CIGA and that you receive this guarantee.
2. BBA Certification: The British Board of Agrément (BBA) certifies construction products and systems. Ensure that the insulation material and the installation process are BBA certified.
3. Installer Certification: Verify that the contractor is certified by a recognized body such as the National Insulation Association (NIA) or the British Board of Agrément (BBA).
4. Building regs compliance evidence

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andos in reply to @user16171

Thats pretty much what we got. Although the building regs compliance come with the materials I think. i.e they used a material and process that conforms.

In reality we just got the certificate which contained an additional letter with the guarantee, with the installers name and their credentials. I think on either the cert or letter they confirm the materials and methods.

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