Building Information Modelling (BIM)

Building Information Modeling (BIM) is a process for creating and managing digital representations of buildings throughout their lifecycle — from conception through design, construction, operation, and demolition. Modern Indian construction increasingly uses BIM for design coordination, clash detection, quantity estimation, construction sequencing, and facility management. International standards: ISO 19650-1:2018 + ISO 19650-2:2018 (information management); Indian Standards: NBC 2016 Part 11 (Building Automation), with NBIMS-IN (National BIM Standard - India in development).

BIM levels (per UK BIM Maturity Model): Level 0 — paper-based 2D CAD; Level 1 — 2D + 3D models without integration; Level 2 — 3D models with shared data (current Indian practice for major projects); Level 3 — fully integrated lifecycle model (advanced markets). LOD (Level of Development) progression: LOD 100 (concept), LOD 200 (schematic), LOD 300 (detailed design), LOD 350 (construction documentation), LOD 400 (fabrication), LOD 500 (as-built/FM). Each LOD represents increasing model specificity and accuracy.

BIM tools: (1) Authoring — Autodesk Revit (dominant Indian use), Bentley Microstation, Graphisoft ArchiCAD, Trimble Tekla. (2) Coordination — Autodesk Navisworks Manage, Solibri Model Checker, Trimble Connect, BIMcollab. (3) Quantity take-off — Vico, Tekla, Revit Quantification. (4) 4D scheduling — Synchro, Navisworks. (5) 5D cost — Vico, ProEst, Buildxact. (6) Facility management — IBM TRIRIGA, Archibus. Indian BIM market: dominated by Revit (75%+ share), Tekla in steel-heavy projects, Bentley in infrastructure. Major Indian BIM users: L&T, Tata Projects, Capacit'e, Brigade Group, M3M, DLF. Government BIM initiatives: UP RERA mandates BIM for projects above 10,000 sqm; Mumbai metro requires BIM Level 2; airports increasingly require BIM Level 3.