Buwani Kilpatrick, Senior Sustainability Consultant at GreenBuildConsult, attended the recent CIBSE Daylight Group meeting on the subject of EN 17037: December 2018, which provided an overview of the updated daylighting standard published by CEN, the European Committee for Standardisation.

The event was held in collaboration with the Association Française de l’Eclairage and the presenters were Peter Raynham of University College London, Dr Paul Littlefair of BRE, Dr Yannick Sutter of Association Française de l’Eclairage (France) and Dr Bernard Paule of Estia (Switzerland). 

The standards are set to revise the daylight assessment methodology of domestic internal spaces, taking the focus away from Average Daylight Factors to focus on four criteria including:

  • Daylight – Maintaining minimum (100 lux) or median (300 lux) daylight levels within a space.
  • Views Out – Ensure minimum distances to external obstacles and horizontal angles of view from within a room.
  • Sunlight – To receive hours of sunlight at minimum, medium and high values (>1.5 hours, >3 hours and >4 hours respectively) hours at a window.
  • Glare – Maintaining maximum, medium and minimum levels of Daylight Glare Probability (DGP) at 0.45, 0.40 and 0.35 respectively.

It is anticipated that the standard will be adopted by British Standards by May 2019.