How Much Does a Kitchen Extension Cost?
£30,000 – £85,000
per job
A kitchen extension costs between £30,000 and £85,000, encompassing the structural build plus the kitchen fit-out, tiling, electrics, and plumbing. The wide range reflects differences in extension size, the quality of glazing and rooflight specification, and whether the kitchen itself is a basic flat-pack or a bespoke installation.
Average cost
£30,000 – £85,000
per job
Prices vary by region, property type and tradesperson. Always get at least two quotes.
What affects the price?
Extension size - a 3x3m kitchen extension costs far less than a 5x6m open-plan kitchen-diner
Glazing specification - standard windows are cheapest; bifold or sliding doors and large rooflights add £5,000-£20,000
Kitchen fit-out - a basic flat-pack kitchen costs £2,000-£5,000; a bespoke fitted kitchen costs £15,000-£40,000+
Structural complexity - removing a rear wall and installing a steel beam adds £2,000-£6,000 on top of the standard build cost
Labour vs materials
The structural build element of a kitchen extension typically accounts for 50-60% of the total project cost. Kitchen installation, plumbing, and electrics make up the rest.
Questions to ask your tradesperson
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