From the team behind Hampstead Renovations · Est. 2009 · Learn more

Light Well Installation in NW London

Excavating and lining external light wells to bring natural daylight and ventilation into basement conversions — essential for habitable use across NW London's premium property stock.

Typical cost: £8,000–£25,000

Select Your Area

We provide light well installation across NW London's premier neighbourhoods. Each area has specific planning rules and property characteristics — select yours for tailored information.

How It Works

  1. 1

    Survey and Feasibility Assessment

    We survey the external wall adjacent to the proposed light well, confirm the basement floor level relative to the pavement or garden, and check for underground services (drainage, gas, water, electricity) that may affect the excavation position. We also check whether the light well will be under the pavement or garden — both have different consent implications.

  2. 2

    Planning and Pavement Licence (where required)

    Light wells under the public pavement require a licence from the highway authority (Camden, Westminster, Barnet, or Brent depending on location). Front-elevation light wells in conservation areas may require planning permission. We identify the consent route before any structural or excavation work is ordered.

  3. 3

    Structural Assessment and Party Wall Considerations

    A structural engineer assesses the impact of the light well excavation on the existing foundation and any adjacent party wall. In terraced properties with shared party walls, a party wall notice must be served if the light well excavation is within 3 metres of the neighbour's structure. The engineer designs the retaining wall structure for the light well sides.

Select an area above to see the complete 7-step process with area-specific planning guidance.