20, Durngate Street

20 Durngate Street is a house from the 18th century, likely built before 1781. It features a rendered exterior with a pitched roof covered in modern pantiles and a moulded wooden eaves cornice. The front of the house is two stories high and has two bays. On the street side, the door opening is simple and unadorned, while the three windows are framed with sash windows; the ground-floor window has a moulded surround. The layout of the house, as shown on the 1889 Ordnance Survey map, indicates a rectangular plan with a small courtyard on the eastern side. By 1929, part of the building to the south was replaced by an outhouse, and the current layout is a C-plan.

Historically, Durngate Street was nearly fully developed on both sides by 1771, according to Hutchins's map, and No. 20 is part of a varied group of buildings (Nos 18-20) believed to pre-date that year. The house is designated at Grade II for its architectural significance as a well-preserved example of a modest Dorchester house from the 18th century, and it holds group value with the nearby listed buildings at 18 and 19 Durngate Street.