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Thelnetham mill is a small towermill built around 1819, it replaced an earlier postmill which was moved to Diss. When built it had common sails (cloth) with overdrift millstones. Thomas King, a local carpenter, records that the mill was begun in 1819 and 'set to work on Christmas Day Dec.25 1819'
Modernisation in 1832 added a steel windshaft and underdrift stones, probably with the governors. From 1892 a portable steam engine was used to drive a hurst frame. 1914 saw a Hornsby engine run the hurst frame.
The mill was used until 1924.

In the late 1970s before conversion to a house was put forward the site was bought for restoration by volunteers of the Suffolk Mills group.
It is now open on the second Sunday of the month May - October.