Hea 01 - Natural light

GN50 Natural light calculation methodology for Hea 01 in BREEAM V7 - KBCN1683

Latest version: v1.0, July 2026 Guidance Note 50 (GN50) describes the calculation methodologies that underpin the natural light issue (Hea 01) within BREEAM V7. Guidance is provided for methodologies relating to the daylight criteria and the evaluation of glare from daylight criteria. All the calculation methods outlined in the technical manual for these criteria are described in this guidance note. Download Guidance Note 50 View all Guidance Notes on BREEAM Projects (licensed assessors only)

15-Jul-2026 - Updated version released (v1.0)

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View out – eye level - KBCN0581

BREEAM defines an adequate view out as being at seated eye level (1.2 – 1.3m) within the relevant building areas. However, where occupants will not have the option to be seated, for example in some industrial operational areas where the work being undertaken requires occupants to remain standing, the height of the view out can be changed accordingly to suit the eye level of occupants. All other view out requirements have to be met and clear justification provided for changing the height/level of the view out. In some relevant building areas, occupants may not be sitting down to undertake tasks. Allowing the view out height requirements to be changed accordingly ensures building occupants gain maximum benefit from the view out.   

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