Costco – Stevenage – Opening Hours & Store Details Costco is easy to get to on Gunnels Wood Road, approximately a 0.93 mile distance west from the centre of Stevenage (a few minutes walk from Cavendish Road Bus Stop). The store provides service mainly to the locales of Pin Green, High Plash Flats, Todds Green, Stevenage Town Centre, Old Town, Fishers Green, Symonds Green and Bedwell. Read the information on this page for Costco Stevenage, including the hours of operation, location info, contact info and more.