A pre-regulation terraced house is a type of dwelling constructed before Public Health Act 1875 (38 & 39 Vict. c. 55). It is a type of British terraced house at the opposite end of the social scale from the aristocratic townhouse, built as cheap accommodation for the urban poor of the Industrial Revolution. The term usually refers to houses built in the century before the 1875 Act, which imposed a duty on local authorities to regulate housing by the use of byelaws. Subsequently, all byelaw terraced housing was required to meet minimum standards of build quality, ventilation, sanitation and population density.[1] Almost all pre-regulation terraced housing has been demolished through successive waves of slum clearance.