Land at the site will be converted into an unloading area to improve delivery and collection access, increasing the site by 10,000sq m. Further plans to relocate the pre-shredder closer to the main processing line and to move the pre-sorting process undercover are also being considered.
Work is expected to be completed by the end August.
Regional manager Tony Howe said: We only switched to the Stalybridge operation in December 2005 after outgrowing capacity at our other Manchester operation in Ashton-under-Lyne.
The fact we are expanding the site less than two years later shows that the demand for recycling and recovery, as well as the growing levels of WEEE, is out there.
Earlier this year Sims announced an £8 million investment in its Newport facility to construct a 12-acre, purpose-built WEEE facility which would be capable of handling 100,000 tonnes per year.