Kitchen Extension Cost · Greenwich

How much does a kitchen extension cost in Greenwich?

A kitchen extension is one fixed build with a kitchen sitting on top of it, with heritage oversight sharpest near the town centre. Calibrated to Greenwich, a typical 30 m² kitchen-diner rear runs from around £148,000 with a self-managed kitchen to £200,000 and beyond for a bespoke one — the build barely moves, and the kitchen you choose is the whole difference.

Cost your Greenwich kitchen extension See a sample report

One build, four budgets — calibrated to Greenwich

The build is fixed; the kitchen is the variable. For a representative 30 m² kitchen-diner rear in Greenwich, the project total climbs with the tier while the base underneath never moves.

Self-managed IKEA, self-fit
£8,000 – £10,000 £148,000 – £150,000

Supplied & fitted Howdens · Magnet · Benchmarx
£14,000 – £22,000 £154,000 – £162,000

Premium Local bespoke · Second Nature / Burbidge
£23,000 – £50,000 £163,000 – £190,000

Luxe & bespoke deVOL · Tom Howley · Plain English
£60,000+ £200,000+

The fixed build base — £4,680/m² · ~£140,000 on a 30 m² rear. Foundations and slab, walls and superstructure, roof, envelope and glazing, first-fix services, non-kitchen finishes, fees and contingency — and the structural knock-through, the steel and the opening between the existing house and the new room. Identical on every tier.

Figures calibrated from BuildLens South East build data — around 10% above the regional baseline — priced on current day rates and live merchant pricing (2026). Fully loaded — fees, contingency and VAT included. Totals scale with size, and firm to your own property with a report. The full tier ladder, with what each rung buys, sits on the main kitchen extension page.

The knock-through in Greenwich

Greenwich kitchen extensions are terrace knock-throughs at heart — engineer-sized steel in Victorian brick, party wall awards on both sides, and, for addresses near the World Heritage core, rear elevations specified to satisfy heritage oversight as well as building control.

The mechanics are the same everywhere: a wall comes out, an engineer-sized steel beam goes in to carry what it held, building control signs it off, and where the wall sits on or near a boundary, a party wall matter follows. All of it is standard, all of it is predictable from the property, and all of it is carried in the fixed build base — the tier ladder above sits on top of it, never inside it.

The full ladder, rung by rung. What each kitchen tier actually buys — and why bespoke is not the top rung — sits on the main kitchen extension page. This page is the Greenwich calibration of it.

Kitchen extension cost — the full ladder →

Common questions about kitchen extension cost in Greenwich

How much does a kitchen extension cost in Greenwich?

On a representative 30 m² kitchen-diner rear calibrated to Greenwich, the fully-loaded total runs from around £148,000 – £150,000 with a self-managed kitchen, through £154,000 – £162,000 supplied and fitted, to £163,000 – £190,000 for a premium or local-bespoke kitchen, and £200,000+ for a named bespoke maker. The build base is fixed at about £140,000; the kitchen tier sets where the total lands.

Does heritage oversight change a Greenwich knock-through?

It changes the rear elevation more than the steel. The structural work prices as Victorian fabric demands anywhere; what the World Heritage buffer adds, for addresses near the core, is closer control of the glazing, materials and roofline the knock-through opens onto — design iteration and specification rather than structure.

Why does the kitchen choice change the total by so much?

Because the build behind it doesn't change. The structure, roof, envelope, services and the knock-through steel cost much the same whichever kitchen goes in — so the entire spread on the same extension sits in the kitchen tier. Picturing a bespoke kitchen on a mainstream budget is where most kitchen-extension budgets come apart.