EN 17037 §4.3 — Exposure to sunlight
Part of EN 17037:2018. See that page for legal status.
Requirement
At least one habitable room in a dwelling should receive direct sunlight on a reference day between 1 February and 21 March, assessed at a point on the inside of the window.
| Level | Minimum sunlight hours on the reference day |
|---|---|
| Minimum | 1.5 h |
| Medium | 3.0 h |
| High | 4.0 h |
Applied to a whole dwelling, the recommendation is that at least one habitable room reaches the chosen level.
Calculation setup
Verified at a reference point on the window, considering as many daylight openings as needed to reach the target — not the same reference plane used for daylight provision. See Annex D of the standard for the reference-point definition and verification methods (manual geometric procedure, software, or on-site fish-eye photography).
How LUX handles it
Status: 🔜 Planned, not yet supported in LUX Live v0.3.0. Sunlight exposure is not currently computed by LUX.
Sources
See EN 17037's Sources.