Cobstone Windmill Ibstone · Buckinghamshire · England

Cobstone Windmill stands on the hillside at Ibstone, overlooking Turville. Historic England records the official listed name as Cobstone Windmill and places it in the parish of Ibstone. The building is a former smock mill, now converted to residential use.

The listed building description identifies it as a late eighteenth- to early nineteenth-century smock mill, while specialist mill sources commonly give a date around 1816 and state that it replaced an earlier mill associated with the site. It was built as a wind-powered corn mill. Sources note that the machinery used in the mill had previously been used at Lacey Green, and that the mill worked grinding cereal until the nineteenth century.

After working use ended, the structure deteriorated. Accounts of the later history record fire damage caused during a period when squatters occupied the mill, followed by further decline. In 1967 the mill was cosmetically restored for its role in the film Chitty Chitty Bang Bang, when a remoulded cap, new fantail and light wooden sails were added.

In the early 1970s the property was bought by Hayley Mills and Roy Boulting, and Historic England records restoration and conversion around 1975. The listed structure is described as having a blackened brick ground floor, a timber frame and weatherboarded upper part, a scalloped wooden frieze at the base of an ogee lead roof with finial, twelve sides, three storeys, four wooden sails and a fantail with a small platform. Some machinery survives inside.

The mill remains a landmark above Turville, but its present use is residential.