Itinerary from Amsterdam:

A9, direction Amsterdam E35/A2, direction Amsterdam A9, direction Diemen N236 (Gooilandseweg), direction Weesp Take a left (turn off Weesp, at traffic lights), C.J. van Houtenlaan Follow road, changes into Prinses Irenelaan Take a left, van Houten Industriepark

Itinerary from Amersfoort:

A1, direction Amsterdam Turnoff 3, Muiden Weesperweg (after 1 kilometer) Stationsweg Take a right, Herensingel Follow road, changes into M. Nijhoffstraat Take a left into Jan Tooropstraat Take a right; changes into Herensingel Take a left at traffic lights, into the Casparuslaan and after 100 meters this is the Prinses Irenelaan. Take a right, van Houten Industriepark