Eval’s team differentiates between two categories of staff. Our offices house the administrative personnel and the technical specialists who look after the work planning and who design and engineer the systems. Our technicians ply the highways and byways in their familiar vans on their way to install and maintain systems, as well as to provide customer service.

Staff and management at Eval are always ready to give a helping hand. Here are some of the names and faces of those you’re most likely to meet when you first get in touch:


Ben Warmerdam
managing board


André Hahn
managing board

Arie Hoek

Ed Zonneveld



Of course, the present and the future may be more important, but we’re also proud of our history, even if it’s only to emphasise that we’re not just a one-hit wonder. In fact, we’ve been a successful and leading engineering business for the last 40 years. What was founded as a modest engineering company in 1973 by Ben and José Warmerdam, has now expanded to become a medium-sized enterprise. Eval has been installing electrical engineering, refrigeration, computer-controlled climate-control systems and water technology for countless satisfied businesses ever since. In the beginning, the glasshouse industry and bulb growers (cultivation and export) were our most important markets and that’s still the case today. Later we expanded our customer base and Eval was also commissioned to install building engineering systems, mainly electrical, in industrial units, offices and housing.

Although Eval now employees around 20 permanent members of staff, it is still a close-knit business. With Ben (son of the founders) and André as management, the technically high quality of products and services will remain in high esteem.