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3 Types of Basement Conversion in London

Basement conversions are a popular home alteration choice for a reason.

Converting the existing cellar of your property could deliver a significant extra space your family needs. If your house doesn't have a basement, excavating underneath the footprint could add that extra SQ FT and value you need.

1. Refurbishment or fit-out of an existing basement

Basements tend to exist beneath Victorian and Edwardian houses. When your property already has a cellar, the most straightforward option is to work with what you have. If you haven't touched the basement yet, it probably has base brick walls and lacks waterproofing and insulation.

If you are satisfied with the headroom, you can undertake a basement conversion, including damp proofing, insulation and the improvement of the existing staircase. If your cellar lacks enough ceiling height, the basement conversion project becomes more complex; the floor needs to be lowered and the ceiling raised.

2. Adding a new basement

If your home is missing a cellar, you can add a retrofit basement. Adding new space to an existing building requires professional planning and supervision.

Basement excavations are costly investments, but they pay off; basements can be added under the footprint of your property or even extended further. Did you know conversions can add more value than the cost of build in certain London areas such as Kensington and Chelsea, Fulham, Mayfair, Knightsbridge, Belgravia or Putney?

3. Basement from scratch

Basement can be included as a part of a new build project. If you prefer to keep more of your garden space, we highly recommend getting a fully or semi-underground basement space.

Proposed basement design by Nu Projects

Building a basement can be a challenging project, so it's important to undertake it with the right professionals. Nu Projects London have over 10 years of experience in converting and excavating West London basements. Feel free to read our guide about what you need to know before undertaking a basement conversion project. Get a free consultancy and quote from us.


  1. If your property already has an existing cellar, you can convert it into usable space.

  2. You can add a new basement space under your property. If your home is located in a prime London area, this will significantly increase the value of your property.

  3. Basement excavation can be included in your new build project to safe precious garden space.



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