In the 19th century buildings also appear as incidents in the historic townscape, but whole streets of usually terrace but sometimes semidetached houses start to be developed. Sometimes houses are built up to the street frontage and sometimes they have enclosed front gardens. They have vertically proportioned sash windows and substantial, centrally placed chimney stacks. In addition to red brick and tiled roofs, slate roofs are very common, and gault and Suffolk white bricks are found in the north of the county with yellow London stock bricks in the south. Whilst the 19th century disciplines survive up to 1914, the rest of the 20th century is characterised by a fragmentation of built form much of which has largely failed to relate to the townscape of previous centuries.
Houses tend to be detached or semidetached, sit on individual plots and are set back from the road.
This type of development is referred to as suburban, and is typical of that found in all parts of the country. At higher densities the aim should be to create urban streets typical of pre-20th century development.