The earliest record of a settlement at Allerwash is in the 13th and 14th century. There was a large settlement here in medieval times that gradually decreased in size after the mid-17th. Only three farms and a turnpike road marked on a late 18th century Armstrong's map and in 1844, one farm and three cottages are depicted. An early 18th century plan shows the village had a green with houses scattered at the east end and along the south side. West of the houses was a group of enclosures called 'Tofts' which probably marked the earlier shrinkage of the settlement. No earthworks survive to show the extent of the former village.