Windmill Hill Mill, Herstmonceux

Windmill Hill Mill was built c. 1814 by William Medhurst, the Lewes millwright. It was working by wind until 1893, when it was stopped owing to a weak weatherbeam. It is the largest post mill in Sussex, and is unique in that it is fitted with Hammond's Patent Sweep Governor, a feature previously fitted to Jack Mill, Clayton. After work by wind had ceased, milling was continued by means of a steam-powered mill set up in the roundhouse. Neve, the Warbleton millwright was responsible for the fitting-out of the roundhouse as a power mill. The mill stood derelict for many years with major structural faults, including both side girts being broken.

Windmill Hill Mill is a post mill on a two-storey roundhouse. She has four patent sails carried on a cast-iron windshaft and was winded by a tailpole. The roundhouse is 22 ft in diameter and has a single-storey lean-to extension of part of its circumference. When originally built, the mill had a single-storey roundhouse which was raised in the 1850s. The Hammond's Sweep Governor was fitted in the 1870s.