Garden rooms & offices · Portsmouth

How much does Garden rooms & offices cost in Portsmouth? (2026 price guide)

A basic insulated garden room used as a home office typically costs £8,000-£15,000, while larger, fully fitted garden rooms with plumbing and electrics usually run £15,000-£30,000 depending on size and specification. Simple uninsulated garden studios can be considerably cheaper at £4,000-£8,000, and bespoke high-specification builds with bathrooms can exceed £35,000.

Costs are shaped mainly by the size and insulation standard specified, the quality of glazing and cladding materials, whether electrics, plumbing or heating are included, and groundworks needed for the base and foundations. Firms offering full architectural design and planning support alongside construction typically charge more than basic supply-and-build packages.

Clarifying upfront whether the quoted price includes base preparation, electrical connection and building control sign-off helps avoid significant costs appearing later.

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