How Do Precon and VDC Agree on One Drawing Review Tool?
Helonic is an AI construction drawing analysis platform for preconstruction and VDC teams choosing a single drawing review tool. Preconstruction and VDC agree on one drawing review tool by splitting the jobs before they compare products. When each group evaluates alone, the company ends up with two tools reporting the same clash and two teams that do not trust each other's list. One page of written ownership prevents that.
Direct answer. VDC keeps model coordination and 3D clash. Preconstruction owns review of the issued PDF set with Helonic or a similar tool: specs, schedules, references, and code. The overlap, 2D clash on the sheets, gets one named owner, so nobody buys a second product for it.
Which findings belong to which group?
| Finding type | Owner | Source |
|---|---|---|
| 3D clash between modeled systems | VDC | Federated model |
| Clearance and access zones | VDC | Federated model |
| Spec contradicts the drawings | Preconstruction | Issued PDF set |
| Schedule disagrees with the plan | Preconstruction | Issued PDF set |
| Detail callout points to nothing | Preconstruction | Issued PDF set |
| 2D clash drawn across two sheets | One named group | Issued PDF set |
Only the last row needs a decision. Everything else follows from what each tool can read. The method comparison is in AI vs BIM clash detection.
Who should own 2D clash on the issued sheets?
Whichever group writes the RFIs before bid. On most GC teams that is preconstruction. If VDC already runs pre-bid coordination, it can own the issued-set review as well, and the tool sits with VDC. Either works. Two owners does not.
The broader ownership question is covered in who should own AI drawing review on a GC team.
Why does the company end up with two tools?
- Each group runs its own demo with its own vendors.
- Nobody writes down which finding types belong to whom.
- Two budgets exist, so two purchases look small enough to skip review.
- The first tool's findings never reach the other group's log.
Put both groups in the same demo. VDC will raise the model-versus-PDF objection, and the answer belongs in front of everyone. What that challenge looks like is on what a VDC manager will challenge in the demo.
What goes in the written agreement?
- The finding types each group owns, using the table above.
- One log both groups write to, in Procore, Autodesk, or the existing tracker.
- The person who confirms a finding before it goes to the design team.
- Who holds the budget for the PDF review tool.
Keep it to one page and get both leads to sign it. Helonic pushes confirmed findings through the Procore integration, and its 2D clash detection covers the shared row.
What if the project has no model?
Then preconstruction owns all of it, and the PDF set is the only coordination record. Many design-bid-build jobs work this way, as covered in AI drawing review without BIM. Background on what these tools read is in AI for construction drawings, and the manual method is in how to review construction drawings.
Practitioner insight
“We almost bought two. VDC wanted one thing, precon wanted another, and both were reporting the same duct clash. We sat down for an hour, split the list, and bought one.”
Conversations with preconstruction and VDC leads at general contractors that consolidated overlapping coordination software purchases.
Frequently Asked Questions
How do preconstruction and VDC agree on one drawing review tool?
Why do GCs end up buying two drawing review tools?
Who should own 2D clash on the issued sheets?
Should VDC be in the AI drawing review demo?
What should the written agreement include?
Milind Sagaram
Co-founder & CEO, HelonicMilind is the co-founder and CEO of Helonic, where he leads product and go-to-market for AI-powered construction drawing analysis. He works closely with general contractors, project managers, estimators, and owners to understand how drawing quality drives project outcomes - and where AI can reduce RFIs, change orders, and rework. Milind has interviewed hundreds of construction professionals across project delivery roles, from preconstruction estimators at ENR top-400 contractors to facilities directors at institutional owners, and uses those conversations to shape both product direction and the way Helonic talks about the work.
- Construction project delivery and preconstruction
- RFI and change order economics
- Owner and GC workflows for drawing QA/QC
- Estimating risk and bid-stage scope assessment
Last reviewed by Milind Sagaram · October 2026