Kitchen Extension Cost in Woolwich: 2026 Price Guide

Ask a local builder what the most common job in Woolwich is, and a rear kitchen extension is usually near the top of the list - understandable given the Royal Arsenal's converted industrial and military buildings alongside civic Victorian and Edwardian buildings around Powis Street and Beresford Square 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

As with any ballpark figures, these cover the building work and a standard fit-out only - popular add-ons like bifold doors, roof lanterns and underfloor heating will move the total upward, sometimes significantly.

What affects the price locally

Access is usually what separates a straightforward Woolwich 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 Woolwich conservation area, designated in 2019 to protect its industrial and military heritage - the borough has 23 in total, 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 Royal Arsenal and its Gatehouse 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?

Many single-storey rear extensions fall under permitted development, but there are limits on how far you can extend without full planning permission, and those limits are usually tighter for terraced and semi-detached houses than detached ones. If your home is in one of Woolwich's conservation areas, permitted development rights can be restricted further, so it's worth checking with the Royal Borough of Greenwich's planning department - or a builder who works in the area regularly - before you commit to a design.