10 year guarantee on all side extensions

Build Team will guarantee the work carried out for you (side extensions, London loft conversions and building refurbishments) for 10 years under our construction company London guarantee which will be issued to you as part of our Completion Pack once the build has finished. This is to assure you that in the highly unlikely event that something needs looking at after the work on the house extensions or refurbishments has been completed, we’ll be able to come back and put it right.

Our side return extension clients are extremely important to us which is why we have made sure we are members of certain bodies and associations which vet us and ensure we keep to their strict standards.

On completion of your Design and Build Project Build Team will present you with a Completion Pack for the house building. This pack will contain:

  • All house building drawings and modern house plans
  • Copy of Planning Determination notice completion pack
  • The House Building Completion Certificate from Building Control
  • Party Wall agreement if applicable
  • Gas Safety Certificate
  • NIC EIC part P Electrical Certificate
  • Any guarantees for appliances/fittings if supplied by Build Team
  • Boiler Manual if applicable


Build Team Holborn Ltd. are registered with the Federation of Master Builder (FMB)
and our membership number is 74617.

Fully insured

Build Team Holborn Ltd. are fully insured with £2m Public Liability and £10m Employers Liability cover. We carry the very highest levels of Insurance for house extensions, please contact us if you would like to view our insurance certificate.

Terms & Conditions

To read our Terms & Conditions in full, please click here.


Back to top

We use cookies to provide you with a user-friendly, safe and effective website. Carry on browsing if you’re happy with this, or find out how to manage your cookies here.


Thank you for your request.

We will contact you at your preferred time.