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Summary
BS EN ISO 7817-1:2024 replaces BS EN 17412-1:2020 as the international standard for Level of Information Need (LOIN). Defines LOIN as a combination of geometric information, alphanumeric information, and documentation — the modern alternative to the AIA LOD numbering (100/200/300/400/500).
Specifies the concepts and principles for defining Level of Information Need (LOIN) — what information is needed, when, by whom, and at what level of detail and reliability. Replaces BS EN 17412-1:2020.
Key Values
ReplacesBS EN 17412-1:2020
Three componentsGeometrical (G), Alphanumerical (A), Documentation (D)
Alternative toAIA LOD 100-500 numbering
Practical Notes
! LOIN replaces the simplistic LOD 100-500 system with three independent dimensions
! Define LOIN per object class, per milestone, per use case — not project-wide
! Most clients still use AIA LOD numbers in tenders — offer LOIN as an upgrade if you can
We're adding equivalent international standards for this code.
Quick Reference Values
ReplacesBS EN 17412-1:2020
Three componentsGeometrical (G), Alphanumerical (A), Documentation (D)
Alternative toAIA LOD 100-500 numbering
Key Tables
No tables data
Key Clauses
Cl. 5 — Concept of Level of Information Need (LOIN)
Cl. 6 — Three components: geometrical, alphanumerical, documentation
Cl. 7 — Defining LOIN in EIR / BEP per project milestone
What is the difference between LOD and LOIN?+
LOD (Level of Development, AIA) bundles geometric detail and information into a single number 100/200/300/350/400/500. LOIN (Level of Information Need, ISO 7817) splits this into three independent axes: geometrical detail (G), alphanumerical/property data (A), and documentation (D). LOIN is more precise — you might need rich properties but rough geometry, or vice versa.
Has LOIN replaced LOD in practice?+
Not yet. LOD is more widely used in tenders and BEPs because it's older and simpler. LOIN is technically the modern standard but adoption is slow. Most BIM teams use both — LOD for headline targets, LOIN for the detail.