Policy information sourced from the Brent Local Plan

BD3: Basement Development

Proposals for basement development of an existing property must:

  1. Demonstrate that sustainable design standards are integral to the proposal, including its construction and operation
  2. In the case of habitable development only be ancillary accommodation to a dwelling above
  3. Be no wider than the original building
  4. Extend no further than the existing front elevation, 3 metres to the rear and 1 storey down (4 metres floor to ceiling height for a detached property or 3m in other cases)
  5. Ensure any rooflights are flush with the ground and close to the main building
  6. Ensure any lightwells are modest in scale, preferably located to the rear and if located to the front are no more than whichever is the smaller of 800mm or half the length of the garden.
  7. Be protected from sewer flooding by a suitable pumped device

For more information please see the Brent Local Plan