Trelaske Water Mill is believed to have been the customary mill of the medieval manor of Trelaske, where tenants would have brought their grain to be ground.
A water mill has been recorded on the site since 1342 although the current mill dates from the late 18th century. A number of medieval millstones have been incorporated into the current building structure.
The mill retains all the original primary machinery, hurst frame, and two pairs of millstones. There also remains an adjustment mechanism known as tentering or lightering – which is carried out by a lighter staff (a timber lever). This represents an unusual survival of an early technique. The lighter staff was used to control the texture of the ground product by moving the upper millstone closer or further from the bedstone whilst milling.
Trelaske mill was originally a double wheel (in-line) overshot configuration fed from a very long (2km) leat taken off the River Inny and then via a common launder, a once familiar arrangement in the south-western counties of England.
Only one iron 14' diameter waterwheel now remains together with a portion of the upstream leat and spillway for taking excess water back to the River Inny.
The mill last operated commercially in 1952.