ISO 21723:2019
(Main)Buildings and civil engineering works - Modular coordination - Module
Buildings and civil engineering works - Modular coordination - Module
This document establishes the values of basic module, multimodules for horizontal coordinating dimensions and sub-modular increments for use in modular coordination of buildings. This document also specifies preferred vertical modular dimensions, series of preferred multimodular sizes for horizontal dimensions for all types in accordance with general principles and rules for modular coordination.
Bâtiments et ouvrages de génie civil — Coordination modulaire — Module
General Information
- Status
- Published
- Publication Date
- 02-Sep-2019
- Technical Committee
- ISO/TC 59 - Buildings and civil engineering works
- Drafting Committee
- ISO/TC 59 - Buildings and civil engineering works
- Current Stage
- 9060 - Close of review
- Completion Date
- 04-Mar-2030
Relations
- Effective Date
- 04-Jun-2016
- Effective Date
- 04-Jun-2016
- Effective Date
- 04-Jun-2016
- Effective Date
- 04-Jun-2016
- Revises
ISO 6512:1982 - Building construction - Modular coordination - Storey heights and room heights - Effective Date
- 04-Jun-2016
Overview
ISO 21723:2019 - Buildings and civil engineering works - Modular coordination - Module defines the standardized module system used to coordinate dimensions in building design and construction. The standard establishes the basic module (M = 100 mm), a set of preferred multimodules for horizontal coordination, preferred vertical modular dimensions, and sub‑modular increments. It is intended to harmonize sizing of components, spaces and building systems to improve interchangeability, economy and clarity in design and production.
Key topics and technical requirements
- Basic module
- 1 M = 100 mm (international metric value). Annex A gives the imperial equivalent (4 in = 101.6 mm) for countries using imperial units.
- Multimodules for horizontal coordination
- Standard multimodules: 3 M, 6 M, 12 M, 30 M, 60 M.
- 15 M may be used for special applications.
- A series of preferred multimodular sizes (Table 1) guides selection; preference is given to the largest multimodule compatible with function and economy.
- Vertical modular dimensions
- Modular storey and room heights use defined increment steps: up to 36 M in 1 M steps; 36–48 M in 3 M steps; above 48 M in 6 M steps.
- The relationship between modular storey height, modular floor height and modular room height is specified (modular floor plane positions illustrated).
- Sub‑modular increments
- Standard value: M/2 = 50 mm.
- Allowed for sizing components smaller than 1 M or for finer increments when needed. Not permitted to define distances between primary modular reference planes but may be used to displace modular grids for whole‑project alignment.
Applications and users
ISO 21723:2019 is practical for:
- Architects and building designers applying modular coordination to layouts and room planning.
- Structural and MEP engineers for consistent component sizing and clear interface dimensions.
- Manufacturers of building components and prefabricated systems to ensure products fit modular spaces.
- Contractors and fabricators using modular grids for efficient assembly and offsite construction.
- BIM modelers, planners and standards bodies seeking standardized dimensional rules for interoperability.
Benefits include improved coordination, reduced waste, simplified manufacturing tolerances, and easier integration of prefabricated elements.
Related standards
- ISO 2848 - Modular coordination: principles and rules
- ISO 8560 - Representation of modular sizes, lines and grids (technical drawings)
- ISO 6707-1 - Building vocabulary (terms)
- ISO 1791 (legacy vocabulary source referenced)
ISO 21723:2019 consolidates earlier ISO modular standards into a single, practical reference for dimension coordination in building and civil engineering works.
Frequently Asked Questions
ISO 21723:2019 is a standard published by the International Organization for Standardization (ISO). Its full title is "Buildings and civil engineering works - Modular coordination - Module". This standard covers: This document establishes the values of basic module, multimodules for horizontal coordinating dimensions and sub-modular increments for use in modular coordination of buildings. This document also specifies preferred vertical modular dimensions, series of preferred multimodular sizes for horizontal dimensions for all types in accordance with general principles and rules for modular coordination.
This document establishes the values of basic module, multimodules for horizontal coordinating dimensions and sub-modular increments for use in modular coordination of buildings. This document also specifies preferred vertical modular dimensions, series of preferred multimodular sizes for horizontal dimensions for all types in accordance with general principles and rules for modular coordination.
ISO 21723:2019 is classified under the following ICS (International Classification for Standards) categories: 91.010.30 - Technical aspects. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 21723:2019 has the following relationships with other standards: It is inter standard links to ISO 6514:1982, ISO 6513:1982, ISO 1006:1983, ISO 1040:1983, ISO 6512:1982. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 21723:2019 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 21723
First edition
2019-08
Buildings and civil engineering
works — Modular coordination —
Module
Bâtiments et ouvrages de génie civil — Coordination modulaire —
Module
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specifications . 1
4.1 Basic module . 1
4.2 Multimodules for horizontal coordination dimensions . 2
4.3 Modules for vertical coordination dimensions . 3
4.4 Sub-modular increments. 5
Annex A (informative) Imperial units . 7
Bibliography . 8
Foreword
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This document was prepared by Technical Committee ISO/TC 59, Buildings and civil engineering works.
This first edition cancels and replaces ISO 1006:1983, ISO 1040:1983, ISO 6512:1982, ISO 6513:1982
and ISO 6514:1982, which have now been merged into one document with a new logical structuring.
There is no technical change compared with the previous versions.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
INTERNATIONAL STANDARD ISO 21723:2019(E)
Buildings and civil engineering works — Modular
coordination — Module
1 Scope
This document establishes the values of basic module, multimodules for horizontal coordinating
dimensions and sub-modular increments for use in modular coordination of buildings. This document
also specifies preferred vertical modular dimensions, series of preferred multimodular sizes for
horizontal dimensions for all types in accordance with general principles and rules for modular
coordination.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6707-1, Buildings and civil engineering works — Vocabulary — Part 1: General terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6707-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
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