Extension type

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Several factors can influence the cost of your extension, including its size and complexity, location, ground conditions, and site access. Design choices, specifications, structural requirements, and planning fees can also have a significant impact on the overall budget.

The example costs reflect shell-only construction (including VAT). Additional elements—such as electrical work, windows and doors, plumbing, kitchens, bathrooms, and any bespoke specification requirements—are not included and may increase the overall cost.

Please refer to our free design guide, which outlines every stage of the process—from the initial consultation through to final completion.