Brass Shop, Bolt Shop and Boiler House

The Brass Shop, Bolt Shop, and Boiler House, now used as stores, date from the early 19th century. They are constructed from lime-washed rubble with granite sills, quoins, and timber lintels, and feature mostly clay pantile roofs with gable ends. The buildings have an irregular U-shaped plan, with the Brass Shop and Bolt Shop forming a wing that projects east on the south side, while the boiler house projects to the north, adjacent to the Green Sand Shop to the west and Smiths shop to the north. A former waterwheel that served Smiths shop was located in the northwest corner. The structure is single storey, and the north wall of the Bolt Shop and Brass Shop retains three original 30-paned cast iron windows with spikes behind the glass.

These buildings are part of the Perran Iron Foundry, which was established in 1791 and became the most significant foundry in Cornwall during its peak, known for manufacturing some of the largest beam engines ever constructed. The site is notable for its pantile roofs and the cast iron windows, of which very few examples survive in Cornwall.