Two-up two-down is a type of small house with two rooms on the ground floor and two bedrooms upstairs.
Those built before 1875, the pre-regulation terraces, shared one toilet between several households.
Those built after the passage of the Public Health Act 1875 (38 & 39 Vict.
The rapid urbanisation of Britain during the Industrial Revolution meant that these small cheap terraces were widespread in towns and cities.
[4] In the 20th century, and early in the 21st, areas of this type of dwelling were often targeted for demolition and redevelopment, under a slum clearance programme, but in some areas local community groups campaigned to save them, such as Toxteth Street in Openshaw, Manchester.