Letheringsett Watermill is situated on the River Glaven in the village of Letheringsett within the English county of Norfolk. Letheringsett is in the district of North Norfolk and is 1.4 miles (2.3 km) west of the town of Holt. The watermill is the last fully operational watermill in Norfolk that produces flour. The present mill was built in 1802, and is constructed of Norfolk red brick with a Norfolk black pantiled roof which over sail the walls at the eves. This large watermill is constructed over four storeys and has three apexes on the gable ends. On the gable end there are bricked window fenestrations.The waterwheel was built with a dual irrigation system and was designed to run as breastshot but could be changed to undershot if water levels fell in times of dry weather. To increase the flow of water to the mill, sometime in the 19th century the height of the mill pond dam was increased by 2 feet (0.61 m)