Basement Extension Costs

Basement Extension Costs Table

In certain cases, there may not be much room to expand outwards or upwards, this is especially true in central London. However, a basement extension could be the solution.

Expanding underground poses a number of more challenges when compared to above-the-ground projects, so keep in mind that the costs outlined below are an estimate.

You can contact us for a fast, free, and no-obligation quote.

Cost of Basement Extension in London

The cost of basement extensions usually average around £3000/sqm.

Site survey: from £400
Planning: from £2000
Construction from £100K
Cost/m² about £3000m²

Site Survey

We conduct a full site survey with accurate measurements and photographs, enabling us to prepare scaled drawings for planning applications and documentation for your proposal.

Site Survey: from £400


We assess the history/context of the site and surroundings, research the local planning authority and establish previously proposed planning applications, either accepted or refused.

Planning: from £2000


We offer a wide range of project development and management services during the construction phase, including project and development management.

Construction from £100K
Quote me now

Contact us with no obligation We'll quote you fair price on your house extension project
...or give us a call t. 0203 409 4215

Our Partners

Houzz Logo
Architects Registration Board Logo
Planning Portal