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Basements and Deep Excavations



Basement construction can often add significant time to a project build programme. We have extensive experience of the design and construction of deep basements on challenging urban sites. We’re able to provide alternative construction methodologies that address the competing constraints of programme, cost, impact on adjacent properties and temporary and permanent works interaction.

Our close working relationships with specialist sub contractors provide us with knowledge of the most up-to-date construction methods and innovations, enabling us to develop a holistic solution to basement construction.


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Basements and Deep Excavations Projects

Bankside, Building 1

Home to the Tate Modern, Southwark boasts some of the most contemporary architecture in London. Walsh chose specialist construction techniques to...

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St James Theatre

A constrained site, requiring complicated engineering design at basement level. This site had two main in-ground constraints, a brick culverted...

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Crossrail – Thames Tunnel Portals

Walsh’s answer to a problem of limited space for machinery, by providing an alternative form of temporary works, was crucial to the success of...

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EC4 Hotel

Sophisticated design of a boutique hotel which included a double basement below an existing basement and within 3m of a Grade I listed church...

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Radisson Hotel, Guildford

Value engineering of a three storey basement which was delivered eleven weeks ahead of programme and £1m under budget. There was also an additional...

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Prince of Wales Drive

Walsh’s clever value engineering of the initial design removed the need for complex and expensive temporary works, providing significant cost and...

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Windsor House

On St James’s street in SW1A, this development included demolishing the original building, and erecting a new one which included a new double...

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Woolwich Central, London

This versatile concrete frame development is a significant step forward in the regeneration of Woolwich and demonstrated the difference that value...

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New Capital Quay

This multi-use concrete based development posed challenges due to its waterside location and required close collaboration with The Environment Agency...

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