For simplicity
For sustainability

For the future_

Maximising building performance is both complex and technically challenging. This is exactly what GDM excels at.

We are building services design consultants with a difference: we work to make the complex simple by applying smart thinking with technical expertise. Our personal and collaborative approach to our clients ensures that we gain a deep understanding of your needs, ambitions and project goals from the outset.

At the heart of our designs are detailed technical drawings and specifications based upon a forensic attention to detail. No wasted time, no wasted expense, just seamless project delivery at every stage.

Adept at undertaking works of all sizes and complexity we cover all sectors ranging from Commercial and Retail to Residential and Education. This places GDM at the forefront of the Building Services Industry.


We are leading industry specialists in our field, proud to be associated with many award-winning projects.


We are innovative in our thinking utilising the latest technology, enabling us to create accurate building models and superior technical information.

Long-standing client relationships_

Ongoing repeat business is testament to our ability to deliver bespoke solutions on a regular basis.

Our Projects

The space is really beautiful_

Great job to your team for really pushing the engineering beyond the norm in London and of course for letting me drive you crazy.

Troy Grichuk_
Design Director — Gensler, NY_
28_09_2018 By admin_

Design consultants_

with a difference

We work to make the complex simple by applying smart thinking with technical expertise.

GDM is part of Extentia Group, a group of specialist companies dedicated to every facet of the built environment; market leaders in our respective fields, together we deliver joined-up thinking to develop long-term property strategies that drive productivity and enhance business performance.

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