Semi
‘Semi’ is a contraction of ‘semi-detached’ and is a term commonly heard among property-buyers and sellers. It describes a semi-detached house which shares a party wall on one side with another house (usually of similar design) while on the other side has no attachment at all.
Hence the term ‘three-bedroom semi’ often implies a house with three bedrooms, two reception rooms and a garden.
Properties that have no adjoining neighbour are described as 'detached', whereas properties with adjoining neighbours on both sides are described as 'terraced'.
The term ‘semi’ need not necessarily imply any particular use of materials or architectural style. It can describe two houses of any style that are joined together. However, for many in the UK, especially England, the term semi will typically conjure up an image of a 1920s- or 1930s-style house with three bedrooms, bay windows and tiled pitched roof.
[edit] Related articles on Designing Buildings Wiki
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
Gasholders: a history in pictures. Book review.
Recognition, influence and growth
SocEnv identifies three strategic pillars in new strategy to 2045.
Discover the future of roofing, cladding and insulation.
New guidance for professional practice, cultural change and regulation in social housing.
The heritage of nuclear and conventional power stations.
New measures to stop people being ripped off
Government to protect families from cowboy builders and aggressive bailiffs.
New Futurebuild showcase brings an innovation-first approach.
National Planning Policy Framework
Understanding the 2026 changes.
ECA's public affairs priorities
Member consultation opens to shape priorities for 2027 to 2030.
Dutyholder responsibilities from 1 July 2026.
Where performance meets practice
The Building Envelope Stage at UKCW Birmingham.
CIAT publishes briefing on planning reforms.

















