Plandome

Single-storey rear extension: rules, council figures and cost

Under permitted development a rear extension may project up to 4 metres on a detached house or 3 metres on any other house without planning permission, subject to the other Class A limits; larger home extensions of up to 6 or 8 metres go through the neighbour consultation scheme.[1]

Plandome's fixed fee for this service is £1,500 (VAT_WORDING_TBC). The council's own application fee is separate.

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Sources

  1. GOV.UK: Permitted development rights for householders: technical guidance (read 14 November 2026)