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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rooflight sizes

10–20% Daylight: Rooflight Sizes for UK Homeowners With 3D Modelling

Room-led rooflight sizing for UK homeowners and builders. Use the 10–20% daylight rule, follow the supplier checklist, and test dimensions with 3D...

The Extension Works 6 September 2026
10–20% Daylight: Rooflight Sizes for UK Homeowners With 3D Modelling