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Welcome to GSA Careers!

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Who Are We?

The Geotechnical Subcontract Alliance (GSA) is a key part of the Sizewell C nuclear power station project on the Suffolk coast.

We focus on preparing the ground for construction by building cut-off walls, improving soil stability, and installing bearing elements and retaining structures.

The work involves advanced techniques such as piling, diaphragm walling, soil mixing, and grouting, using specialist equipment including hydrofraises, hydraulic grabs, piling rigs, and soil mixing plants.

The GSA team operates under a collaborative alliance model to deliver safe, efficient, and high-quality results.

Our Alliance Partners

  • Bachy Soletanche

    Leading global geotechnical specialist with heritage dating back to 1927, delivering high-quality, evidence-based ground engineering solutions across the UK as part of the Soletanche Bachy Group.

  • Balfour Beatty Ground Engineering

    UK geotechnical specialist with over 100 years’ experience, delivering piling and ground improvement solutions for major infrastructure using a data-led, value-engineered approach.

  • VSL UK

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