Classification systems give every BIM object a structured code so cost, programme, and operations data can be aggregated consistently. ISO 12006-2 defines the FRAMEWORK; specific classifications (Uniclass, OmniClass, NRM, CCS) implement it. India has no published BIM classification — most Indian projects borrow Uniclass 2015 from the UK.
Related 📐 ISO 12006 ✏️ Concrete cover 📘 Concrete cover 📖 Min cover for RCC 🔧 RCC design
ISO 12006-2 Classification Tables
ISO 12006-2 defines 15+ classification table 'types'. Each implementing system fills these with codes.
Item Purpose Uniclass OmniClass Example Construction Entities Whole assets En 11 Hospital, school, office tower, bridge Construction Complexes Group of entities Co 21 Hospital campus, residential township Spaces / Functional Spaces Rooms and activities SL / Ac 13 Operating theatre, lecture hall, parking bay Construction Elements Functional building parts EF 21 External wall, floor structure, roof Systems Subsystems within buildings Ss 22 HVAC system, fire alarm system Products Manufactured items Pr 23 Specific brand of tile, light fitting, pump Activities Construction activities / processes Ac 31 Concrete pouring, painting, demolition Work Results Outcomes of construction processes WR 22 Painted wall finish, tiled floor Materials Materials and substances Ma 41 Concrete M30, steel Fe500, granite Properties Object property attributes — 49 Fire rating, U-value, weight
Uniclass 2015 (UK — most-used internationally)
Maintained by NBS (National Building Specification, UK). Free, frequently updated.
Item Purpose Uniclass OmniClass Example Origin — UK — Maintained by NBS (UK) Update frequency — Quarterly — Most actively maintained system Free download — Yes — uniclass.thenbs.com Structure Hierarchical L1.L2.L3.L4 codes — Pr_30_59_98_25 = Wall finishes, paints BIM tool support — Revit, Tekla, ArchiCAD — Native parameter or shared parameter India usage — Most-used in India — Default when international consultants involved
OmniClass (USA)
Maintained by CSI (Construction Specifications Institute, USA). Used widely in North American projects.
Item Purpose Uniclass OmniClass Example Origin — — USA Maintained by CSI (USA) Update frequency — — Less frequent than Uniclass — Structure — — 47 numbered tables (11-49) 23-13.35.12 = Cast-in-place concrete column Tool support — — Strong in Autodesk products Revit native OmniClass parameter India usage — — Less common Used when client is North American
Other Classification Systems (less common in India)
Item Purpose Uniclass OmniClass Example CCS (Cuneco Classification System) Denmark — — Mandated for Danish public projects Talo 2000 Finland — — Finnish national system MasterFormat USA — specifications — Numerical (00-49) Used for project specifications, not modelling UniFormat USA — elements — Letter codes (A-Z) Used for early-cost estimating
Practical Choice for Indian Projects
Item Purpose Uniclass OmniClass Example Indian Standard? — — — NO — BIS has not published a BIM classification Default recommendation — Uniclass 2015 — Most-used in Indian BIM projects, free, well-maintained If client is North American — — OmniClass Match client expectations If client is European — Uniclass / CCS — Depends on country ONE per project — — — Pick one in BEP and stick with it. Mixing causes downstream cost/operations data issues
Notes
• Classification = how every object in your BIM model is categorised so cost, programme, and operations can roll it up consistently
• Pick ONE classification system per project — defined in the post-appointment BEP
• Uniclass 2015 is the de-facto standard on most Indian BIM projects — free at uniclass.thenbs.com
• OmniClass is preferred when the client is North American or works with Autodesk products natively
• Embed classification codes as IFC properties so they survive export to other tools
• There is no Indian Standard for BIM classification — opportunity for BIS to publish one
• Don't 'invent' a classification mid-project — borrow Uniclass and tag any India-specific entries as custom
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