ISO 19454:2019

INTERNATIONAL ISO
STANDARD 19454
First edition
2019-08
Building environment design —
Indoor environment — Daylight
opening design for sustainability
principles in visual environment
Conception des bâtiments — Espace intérieur — Conception des prises
du jour pour les principes de durabilité dans l'environnement visuel
Reference number
©
ISO 2019
© ISO 2019
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Fundamentals . 4
4.1 General . 4
4.2 General principles of sustainability . 5
4.3 Project information . 5
4.4 Framework of generation and verification . 5
4.5 Framework of documentation at approval . 6
4.6 Harmonization of architectural and daylight opening design. 6
5 Design elements of daylight openings . 6
5.1 General . 6
5.2 Matrix of aspects of daylight opening design . 7
5.3 Daylight opening ratio to the wall area . 8
5.4 Daylight opening ratio to the floor area . 8
5.5 Levels of indoor daylight and the extent of sunlight . 8
5.6 Quality of views to exterior . 8
5.7 Daylight control systems in the building . 9
6 Design process of daylight openings . 9
6.1 General . 9
6.2 Stage I — Formulation of project definition . 9
6.2.1 Project definition . 9
6.2.2 Output — Document I .10
6.2.3 Evaluation I .10
6.2.4 Output — Approval of document I .10
6.2.5 Iteration .10
6.3 Stage II – Schematic design .10
6.3.1 General.10
6.3.2 Input .10
6.3.3 Output .11
6.3.4 Evaluation II .11
6.3.5 Approval of document II .11
6.4 Stage III – Detailed design .11
6.4.1 General.11
6.4.2 Input .11
6.4.3 Output – Document IIIa.12
6.4.4 Analysis .12
6.4.5 Output – Document IIIb .12
6.4.6 Evaluation III .13
6.4.7 Approval of documents IIIa and IIIb .13
6.4.8 Iteration into detail design .13
6.5 Stage IV – Final design .13
6.5.1 General.13
6.5.2 Commissioning documents .14
6.5.3 Cost estimation .14
6.5.4 Output: the final documents .14
Annex A (normative) Flow diagram of the design process .16
Annex B (informative) Basic architectural forms of the daylight opening .17
Annex C (informative) Matrix of aspects of daylight opening design .19
Annex D (informative) Matrix of output required to satisfy daylight opening design .23
Bibliography .26
iv © ISO 2019 – All rights reserved

Foreword
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This document was prepared by Technical Committee ISO/TC 205, Building environment design.
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Introduction
ISO 16813 provides general principles for the design of the indoor environment for buildings. The
design process for the indoor visual environment is provided by ISO 16817 to ensure required visual
comfort, good physiological effects of light and building energy performance and sustainability.
This document provides design team members with a design process for daylight openings under the
umbrella of ISO 16813 and ISO 16817. Receiving daylight is a fundamental human need. It is essential
to ensure favourable daylight environments in buildings. Daylight opening design is an indispensable
element of building design. This document is targeted at habitable rooms in all buildings to ensure
sufficient, quality daylight.
For this document, both windows and rooflights are deemed daylight openings. The size and position of
the daylight openings affect the amount of daylight entering a room as well as the view from the daylight
opening. An appropriate sizing of the daylight opening ensures a necessary level of daylight and an
impression of spaciousness. However, large daylight openings can require more control of daylight in
terms of visual and thermal environments. Qualities of daylight admitted through the daylight opening
vary depending on the direction in which the daylight opening faces.
This document:
— provides a framework for taking into consideration various parameters and criteria in daylight
opening design;
— is intended for use by des
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