New Builds

CCL has vast experience within the new-build sector, it can engage at the early design concept of a project, or can offer a Design and Build service for Main Contractors. This is all underwritten by CCL’s highly respected £10 million Professional Indemnity (PI) Insurance.

The ‘BS 8102:2022 Code of Practice for ‘Protection of below ground structures against water ingress’ states that, “A Waterproofing Specialist should be included as part of the Design Team so that an integrated waterproofing solution is created”. For this reason, our experienced CSSW designers are happy to engage with the early design phase of a project, through to the final construction design.

Within BS8102 there is the suggestion of four grades of waterproofing as detailed below:

  • Grade 1a – Seepage and damp areas from internal and external sources are tolerable, where this does not impact on the proposed use of below ground structure. (Internal drainage might be necessary to deal with seepage).
  • Grade 1b – No seepage damp areas from internal and external sources are tolerable.
  • Grade 3 – No seepage is acceptable. Damp areas as a result of internal air moisture/condensation are tolerable; measures might be required to manage water vapour/condensation.
  • Grade 4 – No water ingress or damp areas is acceptable (Ventilation, dehumidification or air conditioning necessary; appropriate to the intended use).

With this in mind, it is important that the client and wider design team is knowledgeable of the desired grade of waterproofing and is in agreement. For example, a Grade 1 environment might not be acceptable to a client who is housing his car collection within the basement below.

In tandem with BS8102, BS 8485:2015+A1:2019 – ‘Codes of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings’, must be followed should the presence of ground gases be considered as a risk. In such scenarios, it is imperative that the continuity of the structural waterproofing and ground gas design is adequately designed from the outset.

Within BS8485, typically following a Geotechnical and desk survey, a localised plot of land would be given a CS rating depending on the perceived risk. Upon such a CS rating being issued, CCL would be able to compose a compliant design.

Since CCL’s creation in 1997, it has had the privilege to work on countless high-profile projects throughout the United Kingdom and Europe. Working on projects such as London’s UCLH, The British Museum and The Royal Opera House, to name a few.

An integral part of CCL’s business has been working on new build developments alongside Architects, Principal Contractors and Design & Build Sub-Contractors, providing them with their desired goals without compromising on the quality at any point.

As CCL is an approved applicator for all the major waterproofing manufacturers, it can offer a design and/or installation guarantee for every project scenario.

Latest Projects

The Marshall Building, London

British Museum

The British Museum, London

St John at Hackney

St John’s Gardens, Hackney

Oxford Student Castle

Student Castle, Oxford

South Lodge Spa

South Lodge Hotel & Spa, Horsham

Sky Central

Sky Central

Sidney Sussex College

Sidney Sussex College Cambridge University

Royal Opera House

Royal Opera House Covent Garden

Paterson Building

Paterson Building, Manchester

CCL’s applications include:

  • Design
  • Basement waterproofing
  • Podium
  • Ground gas
  • Trafficable coatings
  • Water management systems
  • External membranes
  • Concrete repair

CCL’s areas of new build expertise include:

  • One-off house design projects
  • Entire estates (multiple plot) projects
  • Residential towers
  • Commercial projects (from new airports through to publicly funded hospitals)
  • Industrial premises

Design | Supply | Installation

Cast Contracting Ltd (CCL) is the UK’s leading specialist in Design and Installation of all Waterproofing, Tanking and Ground Gas Systems across the United Kingdom. CCL prides itself on offering the highest level of service throughout the Design, Planning, and Installation process.

Structural Waterproofing & Ground Gas Solutions

CCL’s in-house design team can offer a comprehensive proposal for all scenarios in line with BS:8102 and BS:8485.

CCL Guarantees

One of the most comprehensive Guarantees across the industry, taking full project ownership.


Cast Contracting Limited is one of the longest standing industry specialists. As it is now part of the CCL Group of Companies, Cast Contracting Ltd has the additional stability and support with over sixty employees across the Group.

Our Services:

Working throughout the UK, CCL takes pride in offering the highest level of service with every major manufacturer across the sector.


Basement Waterproofing

Podiums / Terraces / Balconies

Ground Gas Membranes

Trafficable Coatings

Water Management System

External Membranes

Concrete Repair

Customer Success Stories

friars walk logo

★ ★ ★ ★ ★

Friars Walk

“The CCL team were incredibly conscientious and provided a 24-hour installation service to ensure our strict schedules were achieved. The team on site were very helpful and were able to provide solutions to overcome any problems encountered during the construction of the site. Nothing was too much trouble.”

Lee Lovering, Construction Manager, Bowmer and Kirkland

★ ★ ★ ★ ★

Royal Opera House

“Cast Contracting’s waterproofing expertise ensured that all of the critical waterproofing works carried out at The Royal Opera House were to the highest professional standard. The helpful and proactive team of applicators were able to deliver the waterproofing works to our strict installation programme whilst achieving a high quality of workmanship.”

Tom Ogden, Site Manager, Careys PLC

★ ★ ★ ★ ★

Grosvenor House

“Grosvenor House was a complex domestic build located on a site that was very wet. The subterranean ground conditions were running sand and a potential ground water pressure of 5 tonnes per square metre expected to the RC basement structure. With this in mind we needed to have complete confidence in the company who would be providing the water proofing solutions, which we found in CCL. From their initial proposals all the way through to completion they were professional, helpful, thorough and cost effective. It is imperative as a luxury house building company that you have a watertight structure below ground. Due to the CCL solutions and implementation, there have been no such issues that have arisen since completion and that is invaluable.”

Craig Riley, Contracts Manager, Charybdis Developments Ltd

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