ABSTRACT
Developments of semi-detached houses that include the option of future extensions to the side need some kind of design code controlled by planning, covering materials, roof profiles and the shape and size of window openings. If land values are low enough, one immediate advantage of the semi over building very deep terrace houses is that the latter often have a zone with no daylight in the centre of the plan, only suitable for bathrooms, storage and other servant spaces. The adoption of a semidetached form could allow for additions and extensions to be made during the life cycle of a family household, but this would require considerable discipline on the part of Development Control and their administration of a design code. The universal 1920s speculative semi-d comprised a hall and stair which led to the kitchen, off which a small larder was sometimes provided.
