BIM means something different to every firm on a project, but they all share one blind spot: whether the built structure actually matches the model. This firm-by-firm guide covers who uses BIM at what level, the construction rework cost each firm carries, and how AR-based as-built verification with DeltaARBIM protects that money on site.
Architecture firms: design intent, verified on site
| LOD used | 100 to 300 (concept to design development) |
| Dimensions | 3D, some 6D on green projects |
| Uses BIM for | Design, visualization, spatial coordination, design-intent handover |
| The number | On a Rs 60 crore building, a single rework slice is about Rs 3 crore, and design-to-site mismatches are a frequent trigger. Early as-built verification keeps the architect out of that bill. |
✓ DeltaARBIM confirms the build matches the design intent, space by space, so the architect's BIM model stays the reference on site instead of a drawing no one trusts.
Structural engineers: BIM verification before the next trade
| LOD used | 300 to 400 (design to fabrication) |
| Dimensions | 3D, 4D for erection sequencing |
| Uses BIM for | Structural modelling, load coordination, clash detection, connection detail |
| The number | Structural rework sits at the costly end. On a Rs 45 crore structural package, exposure runs roughly Rs 2.7 crore to Rs 4 crore, before counting the schedule and safety risk a misplaced element carries. |
✓ DeltaARBIM verifies that structural elements are placed and aligned exactly as modelled, at plus or minus 2cm, before the next trade builds on top of them.
MEP consultants and contractors: MEP validation on site
| LOD used | 350 to 400 (coordination to fabrication) |
| Dimensions | 3D, 4D for install sequencing |
| Uses BIM for | Services routing, clash detection, prefabrication, coordination |
| The number | MEP reroutes are the most common avoidable rework. On a Rs 20 crore MEP package, that is roughly Rs 1.2 crore to Rs 1.8 crore of exposure sitting in duct runs and hangers. |
✓ DeltaARBIM runs MEP validation on site: check installed routing against the coordinated BIM model before services are closed in behind walls and ceilings.
General contractors and EPCs: as-built verification across trades
| LOD used | 300 to 500 (across all trades) |
| Dimensions | 3D, 4D, 5D |
| Uses BIM for | Multi-trade coordination, sequencing, progress, site execution |
| The number | On a Rs 120 crore project, total construction rework exposure runs roughly Rs 6 crore to Rs 10 crore. Even a slice caught early is a direct swing on margin. |
✓ DeltaARBIM catches deviations across trades on the walk, before they are buried behind cladding or discovered at commissioning.
Precast and prefab manufacturers: verify fit before the crane
| LOD used | 400 (fabrication-ready) |
| Dimensions | 3D, 4D for delivery and crane sequencing |
| Uses BIM for | Fabrication detail, connection design, embed placement |
| The number | On a Rs 90 crore precast package, rework exposure runs roughly Rs 4.5 crore to Rs 8 crore. Add crane downtime: a stopped crane on a 3-day floor cycle burns lakhs a day and pushes every trade behind it. |
✓ DeltaARBIM verifies element fit and embed position against the model before the crane commits, protecting the cycle time that makes precast worth choosing.
Owners and developers: independent as-built verification
| LOD used | Reviews 300 to 500; owns the 500 record |
| Dimensions | 5D for cost, 6D for sustainability, 7D for operations |
| Uses BIM for | Design review, cost control, handover, asset record |
| The number | The owner funds every rupee of rework. On a Rs 150 crore project, that is roughly Rs 7.5 crore to Rs 13.5 crore, and operating costs over a 30-year life run several times the build cost, so a wrong as-built keeps charging. |
✓ DeltaARBIM gives the owner independent as-built verification at handover, checked against the physical build rather than taken on the contractor's word.
PMCs and project managers: plan-vs-built at every gate
| LOD used | Monitors 300 to 500 across the project |
| Dimensions | 4D for progress, 5D for cost, 6D and 7D for oversight |
| Uses BIM for | Progress tracking, quality gates, cost control, coordination oversight |
| The number | The PMC is accountable for the rework exposure it is hired to prevent. On a Rs 100 crore programme, that is roughly Rs 5 crore to Rs 9 crore, and catching a deviation at the right gate is the difference between a variation and a claim. |
✓ DeltaARBIM provides objective plan-vs-built evidence for progress, cost, and quality sign-off, so approvals rest on verified reality.
Facility managers: a verified as-built you can trust
| LOD used | 500 (as-built record) |
| Dimensions | 7D (facility management) |
| Uses BIM for | Asset data, maintenance planning, space management |
| The number | Over a 30-year life, running and maintenance costs commonly run several times the original construction cost. A wrong as-built quietly inflates that, one wasted maintenance visit at a time. |
✓ DeltaARBIM hands over a verified as-built the FM system can actually trust, so 7D asset data reflects what was built, not what was drawn.
A note on the numbers
The figures above apply the industry rework range of 5 to 9% of contract value (Navigant Consulting) to representative package sizes. They show the construction rework exposure that on-site verification helps protect. They are not a guaranteed DeltaARBIM saving, and actual figures vary by project and by how early deviations are caught.
The plan lives in DeltaARBIM ERP. The truth comes from the site.
DeltaARBIM is two halves that close one loop. The ERP holds the plan: the BIM model, the priced BOQ, the clash detection, and the quality gates. The AR app holds the truth: what was actually built, verified on site at plus or minus 2cm. DeltaARBIM ERP is developed by construction technology company Shivlam (shivlam.com), and runs self-hosted on your own server.
Which DeltaARBIM ERP feature suits which firm
| ERP feature | What it does | Best for |
|---|---|---|
| Dashboard | Inbox of inspections, escalations, and alerts | PMCs, project managers |
| BIM 3D Takeoff | IFC and RVT viewer, element extraction, BOQ linking | Architects, QS, BIM coordinators |
| Bill of Quantities | Every work item priced and totalled | Estimators, QS, owners |
| DWG Takeoff | Measure DWG and DXF drawings, link to BOQ | Estimators, QS |
| Clash Detection | Federated interference checks, BCF export | MEP, structural, GCs, coordinators |
| NCRs | Defect, root cause, cost escalation, closure | PMCs, QA/QC, owners |
When DeltaARBIM finds a deviation on site, it does not sit in a photo folder. It becomes a Non-Conformance Report in the ERP, tied to cost through a change order and tracked to closure. The BIM model, the cost, the clash detection, and the verified as-built all live in one self-hosted place.
For firms ready to close the gap
Whether you design, coordinate, fabricate, build, or operate, the BIM model is only worth what it matches on site.
✓ Architects and consultants: prove the build matches your design.
✓ MEP, structural, and precast: catch fit errors before they cost you.
✓ GCs, PMCs, and owners: get objective as-built verification at every gate.
We showed exactly this on a real pour in an earlier site walkthrough. If your firm runs BIM and wants the built result to match the plan, see on-site verification on your own project.
Watch the extended demo: https://vimeo.com/1211164305?fl=ip&fe=ec. Or reach us at build@deltaarbim.tech
