Kitchen Extension Planning Permission in Lewisham

Whether a kitchen extension in Lewisham needs planning permission usually comes down to size, not the fact of building one at all - most single-storey rear extensions qualify for permitted development, subject to the limits below and to Lewisham's own conservation area restrictions.

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 in Lewisham, 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 London Borough of Lewisham and waiting out an objection period first.

Height limits typically apply too - commonly around 4m maximum for a single-storey rear extension, and no higher than 4m within 2m of a boundary.

What's different in Lewisham

the St Mary's and Sydenham Hill and Kirkdale conservation areas covering parts of Lewisham often means reduced or removed permitted development rights - expect closer attention to matching materials, roofline and window style to the existing house. Check your property's exact status with the London Borough of Lewisham before finalising anything.

Get it confirmed, don't assume it

Even where permitted development likely applies, a Lawful Development Certificate from the London Borough of Lewisham 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 Lewisham will usually have a good instinct for whether your plans qualify, but the council's confirmation is what removes doubt entirely.