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Daylight

Requirement	Daylight area
	Dwellings	Buildings other than dwellings
Country	New	New
England/Wales	Guidance = 20% of floor area or BS8206-2	BS8206-2 provides guidance
Scotland	1/15 of floor area	BS8206-2 provides guidance
Northern Ireland	BS8206-2 provides guidance	BS8206-2 provides guidance

"BS8206-2 lighting for buildings. And code of practice for daylighting"

VELUX recommends a minimum daylight area be at least 20% of the floor area for habitable rooms.