Haddenham Mill's tower is four storeys high and built in brick, partially rendered. It is 6.4m in diameter at the base and 4.9m in diameter at the curb. There are loading doors at ground and first floor levels.

The mill has four anticlockwise patent sails. The cap has a tall finial and a six-blade fantail set back unusually far and low. The fan drive with bevel, spur and rack is outside the cap. All external woodwork is painted white.

Inside, the clasp arm construction Great Spur Wheel has double arms 330mm deep. A rack and pinion is used to lift the stone nuts out of gear. There are three pairs of underdrift stones.

The mill ceased wind and all work in 1943 and was derelict by 1950.

Research: PD

"Windmills in Cambridgeshire" by A.C. Smith
Stevenage Museum Publications, 1975