House Extension Costs UK: How Much Does an Extension Really Cost?
May 15, 2026
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House Extension Costs UK can vary hugely, even for similar-sized builds. Your final budget depends on groundworks, structural openings, access, glazing, finishes, and the “soft costs” like drawings, Building Regulations and fees. This guide explains what’s really included in quotes, common cost traps, and a simple step-by-step way to compare builders confidently.
