Cottonbury Mill Belchamp Walter · Essex · England

Cottonbury Mill stood at Belchamp Walter and worked as a wind-powered post corn mill. The surviving structure is the former roundhouse, listed as The Round House, and preserved as a rare base survival of an Essex post mill. Specialist mill records identify the site as Cottonbury Mill, Belchamp Walter.

A post mill at Belchamp Walter is recorded from 1777. The mill continued into the nineteenth century and was last recorded as a working or standing mill in the later nineteenth century. By 1893 the upper body had been demolished, but the roundhouse remained. The base was converted to bakery use, preserving the lower structure after the loss of the working mill body, sails and machinery.

The roundhouse is important because it retains the original trestle. Essex windmill survey work identified this as an exceptional survival: a complete trestle frame within a post-mill roundhouse, surviving by good fortune after the former owner understood the building to be listed and chose not to demolish it. The site adds to the small group of Essex post-mill bases that still preserve physical evidence of the county’s once extensive post-mill tradition.

Cottonbury Mill is now a conserved structural remnant rather than a complete windmill. Its value lies in the combination of the surviving roundhouse, the retained trestle, the mill’s documented eighteenth- and nineteenth-century operation, and its later bakery reuse. Together these elements preserve a rare physical record of the substructure of a lost Essex post mill.