Terling Windmill is a four-storey smock mill on a single-storey brick base. A stage was not used. The mill had four double
Patent sails and the domed cap was winded by a fantail. When the mill was working, it had a tarred smock with a white cap. The smock shows signs of having been dismantled and transported in sections at some point, with the cant posts being newer than the framing. The tower is to the curb, and the domed cap rises above the curb to the underside of the finial, giving the mill an overall height of about .
Sails and windshaft Terling Windmill has a
cast-iron windshaft and four double Patent sails. The last working pair of sails came from
Button's Mill, Diss,
Norfolk, having originally been on the
post mill at
Mount Pleasant,
Framlingham,
Suffolk. They had a span of and were wide. The sails now on the mill have a span of .
Machinery The wooden Brake Wheel is of clasp arm construction, diameter, with 96 cogs. This drives an iron Wallower of with 47 cogs. At the lower end of the long wooden Upright Shaft is the clasp arm Great Spur Wheel, which has 108 cogs, and drove three pairs of
millstones. The two pairs of French Burr stones being driven by Stone Nuts with 26 cogs, whilst the Peak stones were driven by a Stone Nut with 25 cogs.
Fantail Terling Windmill was winded by an eight-bladed fantail, driving an iron worm on the curb. ==Millers==