Kitchen Extension Cost in Wanstead: 2026 Price Guide

Ask a local builder what the most common job in Wanstead is, and a rear kitchen extension is usually near the top of the list - understandable given Georgian, Victorian and Edwardian homes on wide, tree-lined avenues around two historic greens, with larger semi-detached and detached houses than neighbouring areas 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

The single biggest cost variable for a kitchen extension in Wanstead 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 Wanstead Village conservation area, designated in 1970 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 St Paul's Church and Wanstead Park 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?

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 Wanstead's conservation areas, permitted development rights can be restricted further, so it's worth checking with the London Borough of Redbridge's planning department - or a builder who works in the area regularly - before you commit to a design.