The site will provide new warehouse and office accommodation.
Drewitt is providing electrical and mechanical systems, fitting of all electrical wiring, LED lighting and data wiring as well as air conditioning, underfloor heating, hot and cold water supplies, sanitary ware and ventilation.
Main building contractor is Greendale Construction..
Richard Drewitt, joint managing director at The Drewitt Group, said: "The Drewitt Group dates back to 1877 so it's fantastic to work for another long-established family company such as Stewarts. We feel it's important to work with firms who have similar values as us and we look forward to collaborating with the Stewarts on this exciting project."