New Basement and Refurbishment, Holland Park, London
This is the latest project we have completed for a developer client that we have worked with over a fifteen year period. The house is grade two listed and had suffered various unsympathetic and technically flawed conversions in its recent history. Whilst our clients were intent on appropriately renovating and restoring the original house, they were also keen to maximise the development potential of the property. To this end the project team created a vast basement space to the rear of the property, incorporating a swimming pool, gym, sauna, steam room, and parking for six cars. Above this is a new landscaped garden in sympathy with the original period of the house. The scale and proximity of the subterranean space created a number of technical problems, especially in relation to the listed building.

To create the seven metre deep basement we had to drive 15 metre long steel sheet piles into the ground, 100 millimetres away from the rear wall, and then installed ground anchors beneath the house. Over 90 concrete bored piles were also used around the perimeter to allow the basement excavation to proceed.The completed basement has a total volume of more than 3,000 cubic metres, one could park at least ten Double Deck Buses inside it. This is one of the largest basements within a private house in London. The project was completed at the end of 2011.

Architect 23 Architecture
Client Gradeview Ltd
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