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Basements

DAWSON-WAM specialises in the construction of basements using secant and sheet piled retaining wall systems, including close proximity and zero-tolerance installations next to existing structures. We deliver solutions for both open sites and highly restricted or congested urban environments, where precision, minimal disruption, and engineering excellence are critical.

Close Proximity & Zero Tolerance Capabilities

Our advanced Cased CFA piling systems allow us to install piles within as little as 100 mm of neighbouring buildings, compared to the typical 600 mm clearance required with conventional CFA rigs. This precision is achieved while maintaining silent or low-noise and vibration-free operation – making it particularly suitable for sensitive locations such as:

  • Hospitals and healthcare facilities
  • Building extensions
  • Underground car parks
  • City centre developments with limited access.

Full Basement & Foundation Packages

We offer a complete design-and-build service for basements, managing every stage from initial concept to finished structure. Our scope includes:

  • Piling design and setting out
  • Perimeter piling for retaining structures
  • Capping beams for load transfer
  • Bulk excavation and spoil management
  • Temporary load anchoring and propping systems
  • Foundation piling, pile caps, and ground beams
  • Steel and reinforced concrete works from basement slab to ground floor level.

Temporary Works Capability

DAWSON-WAM has significant in-house temporary works capability, providing safe, engineered solutions that support construction efficiency and safety. As part of our basement works, we can design, fabricate, and install:

  • Steel access platforms – providing safe and practical working access for excavation and construction activities
  • Steel propping systems – engineered to maintain excavation stability and support retaining walls during basement construction
  • Bespoke temporary steel structures to suit project-specific requirements.

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This capability allows us to control programme, quality, and safety while minimising reliance on external subcontractors.

Specialist Plant & Experienced Teams

Our fleet of modern, versatile piling rigs and highly skilled teams enable us to operate efficiently in the most demanding environments. Whether working on a greenfield site or in a dense urban core, we adapt our methodology to ensure safety, quality, and programme certainty.

Get in touch with our team