Kitchen Extension Cost in Greenwich: 2026 Price Guide

Greenwich - where Georgian terraces around the historic town centre, the planned Morden College Estate, and Victorian streets running up towards Blackheath - sees a steady stream of rear kitchen extensions, and for good reason: it's often the single change that makes the biggest difference to how a house actually lives day to day.

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

Access is usually what separates a straightforward Greenwich quote from an expensive one. Terraces without a side passage mean everything - materials in, spoil out - goes through the house, and builders price that in accordingly. Add to that the Greenwich Town Centre and Maritime Greenwich conservation areas, part of a UNESCO World Heritage Site, where matching brick, roofline and window detailing to the existing building is typically expected even for extensions that wouldn't otherwise need planning permission.

Don't overlook foundations either: much of the older housing stock close to the Cutty Sark, the Royal Observatory and the Old Royal Naval College sits on shallow Victorian or Edwardian footings, which a structural engineer will often want to deepen or extend before an extension can be signed off.

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 Greenwich's conservation areas, expect those rights to be trimmed back further still - check with the Royal Borough of Greenwich's planning department, or a builder who already works locally, before finalising a design.