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How Much Does an Architect Cost for a House Extension?
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Architect and architectural technologist fees are typically charged as a percentage of the build cost (often in the region of 5–12%) or as a fixed fee for defined stages — concept design, planning application, and Building Regulations/technical drawings.
For a straightforward single storey extension, a fixed fee covering planning and Building Regulations drawings is often more cost-effective than a percentage-based fee. For a more complex or contested project, percentage-based fees reflect the additional design iteration and planning negotiation involved.
We can recommend architects and technologists whose fee structure suits your specific project scope, based on projects we've delivered together previously.
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