How Much Does a Kitchen Extension Cost in 2026?

A kitchen extension creates the open-plan living space most families want. In 2026, expect to pay £30,000–£100,000 for the build and kitchen fit-out combined.

Typical UK range:£30,000 – £100,000

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Cost Breakdown by Tier

Small (15-20m²)£30,000 – £45,000

Single-storey rear extension with mid-range kitchen. Open to existing dining area.

Medium (20-30m²)£45,000 – £70,000

Larger extension with bi-fold doors, kitchen island, and premium finishes.

Large / Wrap-Around£70,000 – £100,000+

Wrap-around or side-return extension with bespoke kitchen, vaulted ceiling, rooflights.

Factors That Affect the Cost

Extension size
Structural steelwork
Kitchen specification
Bi-fold or sliding doors
Underfloor heating
Rooflights and vaulted ceilings

Regional Price Variations

Build costs in London average £2,200-£3,000/m² compared to £1,400-£2,000/m² in the Midlands and North.

Frequently Asked Questions

Do I need planning permission?

Single-storey rear extensions up to 3m (semi) or 4m (detached) usually fall under permitted development. Larger extensions need planning.

How long does a kitchen extension take?

Typically 3-5 months from groundworks to completion, including the kitchen installation.

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Read our full a Kitchen Extension cost guide