How much does a garden room cost in 2026?
Posted on 07/05/2026
How much does a garden room cost in 2026? A professionally installed, fully finished garden room in the UK costs between £15,000 and £50,000. Most mid-range builds covering 12m² to 20m² with full insulation, electrics and proper foundations land between £20,000 and £38,000. The final cost depends on size, specification, roof type, base requirements, insulation grade, electrical installation, cladding materials, glazing choices, and internal finishes. A 3m x 3m home office starts around £15,000, while a 6m x 4m multi-use room or annexe can reach £50,000 or more. Size is the single biggest cost driver, but the base, insulation quality, and intended use all significantly affect the total price.
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