Silcock Leedham Group comprises Silcock Leedham Consulting Engineers (SLCE) and zero energy design (zed.). Together, we deliver turnkey solutions under one brand, offering a unified approach to project delivery with UK-wide coverage.
Silcock Leedham is an award-winning building services engineering consultancy, with expertise in mechanical, electrical and public health system design across the construction sector. Founded in 2001 by Mike Silcock and Bill Leedham, we became a limited company in 2010 as part of a strategic development plan. Headquartered in the UK, we have the resources to successfully deliver projects of any size, across a wide range of sectors and locations. We have international reach, working on projects as far afield as the Falklands and UAE in the Middle East.
zero energy design (zed.) leads the way in construction sustainability, with a skilled team of consultants and building physics engineers. Working closely with Silcock Leedham, they steer projects through the planning and design phases, decoding and unpacking planning policy and net zero legislation to consider all aspects of the projects carbon impact. They have pushed boundaries in both the design and in-use optimisation of buildings, regularly working on cutting-edge projects that gain national recognition.
Silcock Leedham is proud to be an RSK Group company. RSK is a global leader in the delivery of sustainable solutions. Its environmental, engineering and technical services businesses work together to provide practical solutions to some of the greatest challenges societies have ever faced. We know that our global energy supply plays a critical role in reaching net zero. As an RSK company, we can draw on the vast experience and knowledge of other RSK businesses, thereby crafting bespoke end-to-end solutions for any project. All RSK Group companies enable full and transparent interoperability for their clients while offering a complete spectrum of consultants and contracting specialists. Our group company model is based on a complete solution delivery for our clients, with all specialisms orbiting our core business.

In December 2023, the group launched its sustainability strategy, Second Nature. The initiative is centred on five core themes that reflect the responsibilities we owe as a business to our widest group of stakeholders – our people, our value chain, society and the environment – and how these are supported by appropriate finance and governance structures.