About CLW

We are industry leading experts in structural waterproofing, providing professional services in relation to waterproofing of basements and other buried structures. We are entirely independent and have no ties to any waterproofing suppliers or contractors. This means we are solely focused on delivering excellent waterproofing advice that protects buildings and clients.

With considerable expertise and experience, we are able to deliver outstanding value through:

  • Robust waterproofing design
  • True value engineering
  • Advice regarding CDP, insurance, guarantees
  • Assessment of defects

We hold £5m Professional Indemnity Insurance. We are SSiP Approved Designers, Cyber Secure Plus & CHAS Elite Accredited.

Ben Hickman

Technical Director


Ben is a dedicated waterproofing professional, who enjoys understanding and simplifying complex situations.

Working on both expert witness and new design development allows Ben to learn from failure to understand where industry can go wrong and work to ensure mistakes aren’t repeated. 

A front leader in the structural waterproofing space, Ben enjoys shaping the industry. He has authored reviewed articles and best practice guidance, and speaks regularly at conferences.

Mark Patten

Design Manager

MEng (hons) CSSW

Having worked in the construction industry for over three decades for several Tier One contractors, Mark brings a wealth of experience to the team.

A diligent design manager, Mark’s ability to dig into detail – while keeping the big picture in view – is outstanding. As a result, he’s often able to identify potential problems before they occur.

Above all, Mark enjoys achieving the maximum potential in every single job and providing excellent customer service.

Adam Leatherdale

Senior Architectural Technologist


Adam gets things done. Properly. He has instituted all of our filing, document naming, title blocks and protocols.

With over twenty year’s experience drawing for a range of architects and developers, Adam brings an excellence to our drawing communication.

He is also a Certificated Surveyor in Structural Waterproofing (CSSW).

Ranjith Radhakrishnan

Design Engineer


Ranjith is our Design Engineer. He and holds a Master’s in Civil Engineering (M.Sc.) from Stavanger University and is a Certificated Surveyor in Structural Waterproofing (CSSW).

Ranjith has previously worked for Tremco and has international experience in product specification for basements.

Ranjith also champions business development and enjoys connecting with clients and others in the industry.

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