Oldland Mill was built somewhere around 1700, the earliest record of a windmill in the area dates from 1703. The mill was originally an open trestle mill, the roundhouse being added at a later date. Records show a mill stood in Keymer in 1755 and the mill was marked on a map dated 1783, but not shown on one dated 1795. The 1801 National Defence Schedule records the mill but the 1813 Ordnance Survey and Greenwood's 1829 map omit the mill. Records show that the mill was standing in 1828. Oldland Mill was working by wind until 1912. The mill began to fall into disrepair in the early part of the 20th century and continued to deteriorate.