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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How Building Regulations Affect Extension and Refurbishment Costs in the UK

Building regulations can change far more than approvals. They can affect insulation, glazing, ventilation, structure, drainage and labour requirements, which means they also affect cost. This guide explains where extension and refurbishment budgets often move and what helps produce a more reliable estimate.

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