Kitchen Extension Planning Permission in Southampton

Most single-storey rear kitchen extensions in Southampton fall under permitted development, meaning no full planning application is needed - a common route across the city's terraced streets, with Southampton City Council handling conservation area applications where they apply.

Permitted development limits

A single-storey rear extension is commonly allowed up to 3m beyond the rear wall for a terraced or semi-detached house, or 4m for a detached one, without needing planning permission. The "larger home extension" prior approval scheme extends those limits to 6m and 8m respectively, but requires notifying neighbours via the council and waiting out an objection period first. Height limits also apply - commonly around 4m maximum, and no higher than 4m within 2m of a boundary.

Where it gets more complicated

A Freemantle or Shirley terrace extension is a different design brief from a Bassett or Highfield detached house - narrower plots mean materials often go through the house, while the larger detached properties further out tend to have easier access but can carry their own conservation considerations.

Get it confirmed, don't assume it

A Lawful Development Certificate from Southampton City Council is a formal, low-cost confirmation that protects you if a neighbour complains or you sell the house later. A builder who works regularly in your specific part of the city will usually already know what's realistic for your street.