EN 17037 : 2018+A1:2021 : Daylight in buildings.

EN 17037:2018+A1:2021 defines criteria and assessment methods for natural light in buildings. It covers four technical aspects: daylight provision, quality of the view out, exposure to direct sunlight, and protection from glare. Two calculation methods are permitted: daylight factor (DF) calculations or annual climate-based illuminance simulations. Compliance is verified through simulations or on-site measurements using devices such as lux meters and fisheye photography. The standard establishes performance levels (minimum, medium, and high), with thresholds for illuminance, duration of sunlight exposure, and daylight glare probability (DGP). It also specifies calculation grids, geometric parameters - including orientation, obstructions, glazing, and reflectance values - and the simulation models to be used to ensure reproducible assessments of daylighting performance.