Grange Fencing’s Polish parent company, Stelmet, chose the site because of its supply links to Stelmet’s recently opened £30m manufacturing facility in Grudziadz, Poland.
Grange revealed plans to cease UK production in 2016 and closed a Hull facility in 2016.
Grange managing director Neil Taylor said: "The site at Harwich will enable us to improve distribution across the board, creating a number of operational efficiencies for the company as a whole. The fantastic positioning of the Harwich site in relation to the manufacturing base in Grudziadz will help to shorten lead times and will enable Grange to create a stronger distribution network, working in tandem with our Telford headquarters. This increase in our supply chain efficiency is central to the company’s ability to deliver growth across all aspects of the business, from product development to improved customer service."