Daylight & Sunlight — BRE 209 Basics (UK)
Understanding BRE 209 Requirements
BRE 209 'Site Layout Planning for Daylight and Sunlight' provides guidance on assessing the impact of new developments on daylight and sunlight to existing buildings and within new developments. Understanding these requirements is essential for planning applications.
Key Assessment Methods
Vertical Sky Component (VSC)
Measures the amount of sky visible from the center of an existing window, expressed as a percentage.
Daylight Distribution
Assesses the distribution of daylight within rooms using the No Sky Line (NSL) method.
Annual Probable Sunlight Hours (APSH)
Calculates the total annual sunlight hours received by windows in existing buildings.