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Phase 1 · Planning & Permissions · Task 04 of 16

Finding an Architect for Your Extension

How to find, appoint, and manage an architect for your extension. Covers fees (typically £1,500–2,500), what each stage costs, and the questions to ask before you commit.

12 min read£1,500 – £2,500 typical1-2 weeks on siteUpdated 2026Free with email

Prerequisites

Complete this first

The drawings your architect produces will determine what your extension looks like, what it costs to build, and whether building control approves it. Get the wrong drawings, and your builder prices the wrong job. Get incomplete drawings, and your structural engineer can't size the steels. Your planning application gets bounced back if information is missing. Every professional and tradesperson downstream depends on what your architect puts on paper.

That makes this appointment the most consequential decision in the entire planning phase. Not the most expensive. The most consequential.

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