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Can I Extend a Semi-Detached House?
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Yes — semi-detached houses are among the most commonly extended property types across Berkshire, though permitted development limits are tighter than for a detached house: typically up to 4 metres depth for a single storey rear extension (6 metres under the Larger Home Extension scheme, which requires neighbour notification), compared with 6–8 metres for a detached property.
The shared party wall with your neighbour also means a Party Wall Agreement is often required, particularly for any work on or near the boundary, or excavation within a set distance of their foundations.
Side return extensions are particularly common on semis built with the classic side-alley layout, often combined with a more modest rear extension to create an L-shape open-plan kitchen without exceeding permitted development depth limits.
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