Author name: James Hill

Annex / Granny Flat Cost UK 2026: Budget Ranges, Cost Drivers and What to Allow For

Annex and granny flat costs in the UK can vary sharply depending on size, specification, utilities, drainage and whether the space is fully self-contained. This 2026 guide explains realistic budget ranges, what pushes the price up, and how annex costs compare with garden rooms and garage conversions.

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