☀️ Daylight & Sunlight Assessment
Assess the impact of your development on daylight and sunlight for neighbouring properties using BRE Guide BR 209 methodology. Evaluate VSC (Vertical Sky Component) and APSH (Annual Probable Sunlight Hours) compliance.
Assessing daylight & sunlight impact...
About this tool: Daylight & Sunlight Assessment
Detailed daylight and sunlight assessment — BRE 209 tests, 25-degree and 45-degree rules, and neighbour amenity impact.
Use for a fuller assessment when the Daylight & Sunlight screen flags a potential impact on neighbouring windows.
BRE Report 209, NPPF living conditions policy P3
Use these tools when designing your scheme or reviewing drawings. They help ensure your proposal meets technical standards before submission, reducing the risk of officer objections on design grounds.
Guidance to help you prepare — not formal planning advice. Check the current policy text and your council's local plan before relying on it.