THDA is a growing consultancy, specialising in the design of civil infrastructure to development sites. In fact, we're growing very quickly, and have become renowned for the quality of service we offer to our clients.

We know what we're good at, and we stick to doing it well. We don't claim to be able to do everything - there are plenty of other companies out there who specialise in their own individual fields, and if they need to be involved in a project to get the job done, we'll bring them on board to assist.

In 2017 we became part of the Parsons Group, who operate nationally as Patrick Parsons. This merger allows us to offer our clients additional consultancy services including geoenvironmental, structural and building services.

Patrick Parsons

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