We offer expert advice of a high quality in our areas of competence and are focused on improving our clients' commercial position and performance, providing sound solutions to complex problems.

Trett Consulting operates as an individual business within Grontmij, the leading international design, management and engineering consultancy firm with extensive foundations in Northwest Europe. Grontmij, with a turnover of over €750m, currently provides high quality consulting services in the water, systems, transportation, environment, energy and building sectors, and has extensive plans for the continued development of its business. 

Grontmij employs over 8000 skilled professionals with significant engineering expertise.  The accumulation of Trett Consulting’s skills and expertise in commercial and contract consultancy, with specialist dispute avoidance and resolution services, adds a new dimension to the group.