Price guides / Loft Conversions & Extensions / High Wycombe
How much does a single storey extension cost in High Wycombe?
Typical UK price (used for High Wycombe)
£2,200 – £3,300
per m² · most people pay around £2,700
| Typical 20m² extension | £40,000 – £56,000 | per project |
What affects the price
- Architect and structural engineer fees (often 10-15%)
- Kitchen or bathroom inside the extension
- Glazing, roof lights and finishes
- A 10-12% contingency is wise
- Where you live: London and the South East are often 15-30% higher
- Access, parking and how easy the job is to reach
Real MyHomelyHub quotes in High Wycombe
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Leaflet © OpenStreetMap contributors
Guide prices are typical UK figures researched from Builder Expert single storey extension cost 2025, checked 07/10/2026. Prices vary; always compare quotes.