The towers, which are relatively short mills with conical caps, stand approximately 135 metres apart.
[1] They have been separate Grade II Listed monuments since September 1978,[2][3] and are the only historic windmill remains to survive in Dorset.
[4] Although their origin is unknown, Portland's windmills were first recorded in the Land Revenue Accounts of 1608.
It is believed that the two windmills are two of the earliest of their type in the United Kingdom and were probably built by local craftsmen.
[4] The mills, which were traditionally operated by the Pearce family, ceased use in the 1890s as mass-produced flour and bread became available through Portland's modern rail and road links.