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About Extension Specialists on BuilderFind
An extension contractor must coordinate structure, weatherproofing, services and finishes while protecting the occupied home. Before tendering in the UK, develop drawings and a specification so quotes cover the same foundations, steelwork, insulation, glazing, drainage and internal finish.
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Extension Specialist cost guides
Free price guides to help you budget your extension specialist project
20m² Single-storey Extension
A standard build is typically £40,000–£60,000 excluding the new kitchen.
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40m² Two-storey Extension
Two-storey projects commonly range from £108,000–£180,000 by finish and location.
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London Side-return Extension
Constrained access and structural glazing can put projects around £55,000–£100,000.
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Kitchen-diner Extension
Building work plus a mid-range kitchen often totals £60,000–£110,000.
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