Kitchen Extension Cost in Dulwich: 2026 Price Guide

Ask a local builder what the most common job in Dulwich is, and a rear kitchen extension is usually near the top of the list - understandable given a leafy, semi-rural valley setting with Georgian houses and fine Victorian and Edwardian terraces, plus the garden-city cottages of the Sunray Estate across much of the area. Most homeowners are chasing the same thing: a proper kitchen-diner instead of a cramped galley kitchen.

Typical costs

• Small extension (up to 15m²): roughly £30,000-£45,000
• Medium extension (15-25m²): roughly £45,000-£70,000
• Larger or wraparound extension (25m²+): £70,000 upwards

These figures are a guide, not a quote - they cover building work, a standard fit-out, and typical finishes. Bifold or sliding doors, roof lanterns, underfloor heating and a higher-spec kitchen will all add to the total.

What affects the price locally

The single biggest cost variable for a kitchen extension in Dulwich tends to be access rather than the extension itself - narrow terraced streets with no side passage mean materials and spoil go through the house, which shows up in the price. On top of that, the Dulwich Village and Sunray Estate conservation areas often means closer attention to matching brick, roofline and windows, adding cost even where planning permission itself isn't required.

Foundations are the other variable: older Victorian and Edwardian houses near Dulwich Park and Dulwich Picture Gallery were often built on shallow footings, so a structural engineer may specify deeper or more extensive foundations than a newer property would need.

Do you need planning permission?

Permitted development covers a lot of single-storey rear extensions, but not without limits, and those limits bite harder on terraced and semi-detached houses than detached ones. Inside Dulwich's conservation areas, expect those rights to be trimmed back further still - check with the London Borough of Southwark's planning department, or a builder who already works locally, before finalising a design.