How Much Does a House Extension Cost in 2025 (UK)? | Architect Explains
How much does a house extension really cost in the UK in 2025? In this video, architect Emily Barnes shares brand new data from hundreds of residential architects across the UK — revealing realistic project budgets, regional variations, and what actually drives costs up or down.
00:00 Intro
00:12 Why old data online is misleading
00:40 UK average cost for a 10m² extension
01:30 Regional differences – London vs rest of UK
02:00 Why £/m² costs can be so misleading
02:40 Double storey extensions – better value?
03:13 Other factors that affect cost
03:25 Why you should speak to an architect early
03:40 How to find the right architect
📖 Read the full article here:
👉 https://designfor-me.com/cost-plannin...
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NOTES:
These figures are based on our 2025 survey of UK residential architects. Actual costs will vary depending on location, specification, and project complexity. Always get tailored professional advice before starting work.
⏱ Prefer a quick summary? Watch the 1-minute version here → • How Much Does a House Extension Cost in 20...
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