Kitchen extension cost guide
See what a single-storey, open-plan kitchen extension typically costs, and what makes up that cost. Adjust the options and the figures update as you go.
An educational guide, not a price. Every project is assessed and priced individually after a site visit and from working drawings.
Your project
Planning a side, double-storey or other extension? Send us a message and tell us about it in the notes, or message us on WhatsApp.
Size IN METRES
Use external dimensions. Measure to the outside face of the new walls, not the inside of the room. The guide figures are based on this.
Roof and site
The guide shell figure is the same for either roof. The pitched roof shown here has a vaulted ceiling. Your roof choice decides which roof glazing options you see below.
What the shell covers
Included in the shell figure
Not included. Add what you need below.
Extras
Each extra shows a typical allowance including VAT, for guidance only. Tick what you're considering. Exclusions are shown under each one.
Your project needs individual assessment, so extras aren't added up here. Tick what you'd like and we'll include it in your enquiry.
This guide is incomplete
Needs individual assessment
Your project falls outside what this guide covers well, so treat the figures as very rough. These points would be assessed at a site visit:
See the full breakdown
See how this typical cost range is made up, line by line, for the options you have chosen.
Typical allowances including VAT, for guidance only.
All figures include VAT and are based on external dimensions. They exclude land costs, unforeseen ground or structural issues, and anything listed as not included above. This guide is based on extensions of 20 to 38 m² external floor area, about 4 m deep. Other sizes, proportions, unusual ground conditions and complex designs vary more widely.
Discuss your extension with us
Send us your kitchen extension details and we'll get back to you to talk it through and arrange a site visit. That's where your project is assessed and priced. Your size, roof, extras and guide figures are included automatically.
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