Cost guide
How much does a kitchen extension cost?
What a kitchen extension adds on top of a standard extension, and what a typical project costs in total.
A kitchen extension typically adds £15,000-£35,000 on top of the cost of a standard extension, according to both HomeOwners Alliance and Checkatrade, with a typical 20m² kitchen-diner extension running £30,000-£40,000 in total.
Last updated 17 August 2026
| Range | ||
|---|---|---|
| Added on top of a standard extension | £15,000-£35,000 | Total project |
| Typical 20m² kitchen-diner extension | £30,000-£40,000 | Total project |
Sources: HomeOwners Alliance (2026 guide), Checkatrade (no explicit page date found - figures cross-checked against the general house-extension-cost page, updated June 2026)
These are general UK ranges. We build across the North West, including Darwen, Blackburn and the wider Lancashire and Greater Manchester area - site access, local trade rates and travel distance can move your actual price within (or occasionally outside) the range above.
Key points
- Kitchen specification and fit-out - units, worktops and appliances are on top of the building cost.
- Whether the project includes an island, which needs the layout and services planned around it from the start.
- The extension configuration behind it - rear, side or wraparound - which follows the same cost drivers as any other extension.
These are general published ranges, not a quote. Get an estimate based on your own project.
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Common questions
How much does a kitchen extension cost? FAQs
Is this a fixed quote for my kitchen extension?
No. The figures above are published UK industry ranges from HomeOwners Alliance and Checkatrade, not a quote for your project. An accurate price depends on a site survey and your specific requirements - get in touch for an estimate based on your own project.
What actually drives the price up or down?
Kitchen specification and fit-out - units, worktops and appliances are on top of the building cost. Whether the project includes an island, which needs the layout and services planned around it from the start.
What's a typical added on top of a standard extension in total project terms?
Added on top of a standard extension typically runs £15,000-£35,000 (total project), based on the sources cited above.
Other cost guides
More published cost ranges
How much does a loft conversion cost?
Published industry ranges by conversion type, so you can budget sensibly before getting a quote.
How much does a house extension cost?
The published UK per-m² rate for a single-storey extension, and what actually moves it.
How much does a two storey extension cost?
Published per-m² rates by build quality, and what a typical two-storey extension runs in total.
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