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Kitchen Extension Cost · St Albans

How much does a kitchen extension cost in St Albans?

A kitchen extension is one fixed build with a kitchen sitting on top of it, party wall matters are near-standard on the station terraces. Calibrated to St Albans, a typical 30 m² kitchen-diner rear runs from around £136,000 with a self-managed kitchen to £188,000 and beyond for a bespoke one — the build barely moves, and the kitchen you choose is the whole difference.

Cost your St Albans kitchen extension See a sample report

One build, four budgets — calibrated to St Albans

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

Self-managed IKEA, self-fit
£8,000 – £10,000 £136,000 – £138,000
Supplied & fitted Howdens · Magnet · Benchmarx
£14,000 – £22,000 £142,000 – £150,000
Premium Local bespoke · Second Nature / Burbidge
£23,000 – £50,000 £151,000 – £178,000
Luxe & bespoke deVOL · Tom Howley · Plain English
£60,000+ £188,000+
The fixed build base — £4,255/m² · ~£128,000 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 at the BuildLens South East baseline, priced on current trade 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 St Albans

The St Albans kitchen extension is a terrace project at heart — knock-throughs in Victorian brick with party wall awards on both sides — and on the clay streets, the foundations under the new room are priced from the plot rather than a standard detail.

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 St Albans calibration of it.

Kitchen extension cost — the full ladder →

Common questions about kitchen extension cost in St Albans

How much does a kitchen extension cost in St Albans?
On a representative 30 m² kitchen-diner rear calibrated to St Albans, the fully-loaded total runs from around £136,000 – £138,000 with a self-managed kitchen, through £142,000 – £150,000 supplied and fitted, to £151,000 – £178,000 for a premium or local-bespoke kitchen, and £188,000+ for a named bespoke maker. The build base is fixed at about £128,000; the kitchen tier sets where the total lands.
What is local about a St Albans kitchen extension?
The ground and the neighbours. On the shrinkable-clay streets with mature trees, foundations under the new room run deeper than standard, and on the terrace grid a party wall award on each side is the norm rather than the exception. Both are predictable from the address, and both sit in the fixed build base.
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.

Related St Albans pages

Extension cost in St Albans
The build side in full — shell versus all-in, calibrated locally.
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New kitchen cost in St Albans
The fit-out ladder without the build — and what is actually local about it.
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Kitchen extension cost — national
The full combined ladder and the method behind the St Albans figures.
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Beaconsfield Sevenoaks Guildford Tunbridge Wells

Where does your St Albans kitchen extension fit in?

The right BuildLens report depends on why you are asking.

You're ready to build
Cost the whole job, itemised by trade and calibrated to your St Albans property.
Build Cost Intelligence · from £199
You're weighing extend against move
See the maths on staying and building versus selling and buying in St Albans, before you spend on drawings.
Extend or Move · £49
You're selling, and wondering if it pays
What the work costs set against what it returns in the St Albans market, before you commit.
Homeowners Market Intelligence · from £129
You're buying a St Albans property to extend
Cost the work properly before you commit to the purchase price.
Build Cost Intelligence · from £199