One Guarantee have provided a quick comparative guide, explaining the differences between an alteration and an extension.

What are Alterations?

An alteration is building work that is carried out to your home. Examples include:

  • Removing a wall or partition
  • Replacing windows or doors
  • Significant work to drainage, plumbing or electrics
  • Additional insulation to cavity walls

What are Extensions?

Home extensions are building works that lead to an additional space created. Examples include:

  • Additional rooms
  • Conservatories
  • Porches
  • Garages

It is important to note that certain types of work require Building Control Approval. If you are unsure of whether your home alteration or extension requires approval, we advise that you contact your Local Authority.

Will my Warranty still cover it?

When making an alteration or extension to your home, you should take care to avoid damaging the structure of your house. Structural damage as a result of building work could potentially invalidate your structural warranty.

One Guarantee will not be held liable for any damages incurred from alterations or extensions once cover has commenced, unless you have informed your warranty provider of such changes. It is important you read your warranty policy document before making any major alterations to your home.

One Guarantee provide Building Warranties and Latent Defects Insurance for residential and commercial property throughout the UK. For more information on our range of Structural Warranties, please get in touch by calling 01603 218288 or email us.