The Extension Works
UK only: we design and build extensions in London & the South East of England (Surrey, Hampshire & Berkshire) — we can’t quote for projects outside the UK.
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maximum extension depth

3m/4m and 6m/8m Limits: Extension Depth Rules for England Homeowners

Practical England guide for homeowners on extension depth: 3m/4m permitted limits, 6m/8m prior approval ceilings, measuring tips and resale risk checks.

The Extension Works 28 September 2026
3m/4m and 6m/8m Limits: Extension Depth Rules for England Homeowners