By 1842, when the Ordnance Survey recorded the site on its six-inch map, both were operating. One, on the northern bank, has since collapsed to fragments. The other survived, and survived in a form that tells the story of its own expansion.

The southern mill is a substantial structure, rectangular in plan with internal dimensions of roughly 14.8 metres east to west and 6 metres north to south, rising five bays and four storeys with attic windows set into the gable ends. On its western side, a wheel-pit some 3 metres wide once housed an undershot waterwheel, a type driven by water flowing beneath the wheel along the base, relying on the force of the current rather than the weight of falling water. At some point the southern wall was removed and the building extended outwards, the addition being of similar gabled construction but mechanically distinct: its own brick-lined wheel-pit held a breastshot waterwheel, where water enters the wheel at roughly mid-height, combining the push of current with some gravitational force. That the two wheel types coexist within what is now effectively one building suggests the expansion was not simply about adding floor space but about harnessing more or differently managed water. The head race, the channel that directed water to the wheel, is brick-lined and now dry. A footbridge once crossed the river to the north, connecting the two sides of what was, at least on the 1842 map, a double milling operation.