Unsure of the differences between building extensions and alterations? We’ve put together a quick comparative guide to help.

What are building 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 building extensions?

Home extensions are building works that result in additional space. Examples include:

  • Additional rooms
  • Conservatories
  • Porches
  • Garages

It is important to note that certain types of building extensions 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.

Do I need a warranty for my building extension?

In most cases, no, you don’t need a Structural Warranty for an extension. Providing you have planning permission and the project has been signed off by Building Control.

Will my warranty cover a new-build extension?

If you’re considering adding a building extension or alteration to a new-build property, 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.

Speak to us about Building Warranties today

One Guarantee provides Building Warranties and Latent Defects Insurance for residential and commercial property throughout the UK. For more information on our range of Structural Warranties, call 01603 218288 or email us.