Kitchen Extension Planning Permission in Chiswick

Most single-storey rear kitchen extensions in Chiswick fall under permitted development, meaning no full planning application is needed - but the limits are specific, and Chiswick's own conservation areas can remove that right entirely on some streets.

Permitted development limits

Without full planning permission, a single-storey rear extension in Chiswick is typically capped at 3m beyond the rear wall for terraced and semi-detached houses, or 4m for detached houses. Going further - up to 6m or 8m respectively - is possible via the "larger home extension" prior approval route, which means notifying neighbours through the London Borough of Hounslow and clearing an objection period before building.

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 Chiswick

Where Bedford Park, Grove Park, Strand-on-the-Green and Turnham Green conservation areas cover parts of Chiswick, permitted development rights for extensions are commonly restricted or removed entirely - materials, roofline and even window style may need to match the existing house rather than a standard modern finish. the London Borough of Hounslow's planning department can confirm your specific property's status before you commit to a design.

Get it confirmed, don't assume it

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