Catch dimension errors before the field does
Helonic is an AI construction drawing analysis platform for preconstruction teams using Helonic for dimensional verification.
Automatically verify that dimensions add up correctly and match across sheets. Helonic catches dimension string errors, plan vs elevation mismatches, and scale inconsistencies before they reach the field.
Why does dimensional verification matter?
Conflicting dimensions on two sheets send the field a choice, and the wrong choice becomes rework once the wall or opening is built.
| Figure | What it measures |
|---|---|
| 15% | Drawings that contain dimension errors |
| $8K | Average cost per fix of field discovery |
| 500+ | Dimensions checked automatically per sheet |
| 90%+ | Accuracy catching dimension discrepancies |
How does Helonic go from PDF upload to a dimension report?
Helonic reads dimensions across the set and reconciles them so the team sees which sheets disagree before anyone measures in the field.
- Upload drawings. Drop your PDF drawing set into Helonic. Our AI processes architectural, structural, and MEP sheets for dimension data.
- Dimension extraction. AI reads and catalogs every dimension on every sheet, linear, angular, elevation callouts, and grid spacings.
- Cross-reference check. Extracted dimensions are validated against each other: strings must sum, plans must match elevations, schedules must agree.
- Error report. Receive a detailed report of every dimension discrepancy with exact sheet references and recommended corrections.
What dimensional checks does Helonic run?
Helonic checks plan-versus-elevation dimensions, opening sizes against schedules, and overall building dimensions that drift between sheets.
String Verification
- Confirms sequential dimensions sum to the overall dimension
- Catches stray inches and feet conversion mistakes
- Flags partial dimension strings that don't reconcile
Cross-View Consistency
- Validates horizontal dimensions on plans match elevations and sections
- Catches plan vs section mismatches in the same room
- Reconciles roof, floor, and ceiling heights across views
Schedule Coordination
- Ensures room dimensions in schedules agree with the drawn layout
- Verifies door and window opening sizes match openings on plans
- Matches equipment footprints in schedules to plan locations
Grid & Scale
- Verifies grid spacing is consistent across all sheets
- Confirms stated scale matches actual proportions
- Catches scale conflicts between details and parent plans
What does a dimensional conflict cost in the field?
Dimension errors are among the most common and costly mistakes in construction documents. A wall that is 10'-6" on the plan but 10'-0" on the elevation creates confusion in the field, triggers RFIs, and delays work. When dimension strings don't add up, contractors are left guessing which number is correct.
Manually checking every dimension across a full drawing set is practically impossible on a deadline. Helonic reads every dimension on every sheet and cross-references them in minutes, catching errors that would otherwise become expensive field problems.
Every flagged discrepancy comes with sheet references and a recommended fix, so your team can act on it the moment it surfaces.
Frequently Asked Questions
What is dimensional verification in construction drawings?
How does Helonic check that dimension strings add up?
Can Helonic catch a dimension that differs between the plan and the elevation?
Does Helonic check door and window sizes against the schedules?
How does Helonic verify grid spacing and drawing scale?
Manas Gandhi
Co-founder & CTO, HelonicManas is the co-founder and CTO of Helonic, where he leads engineering and AI research for construction drawing analysis. He works directly with structural, MEP, civil, and fire protection engineers to translate the way they review drawings into AI systems that flag the issues that actually matter in the field. Before Helonic, he built machine learning pipelines for technical document understanding and has spent the last several years interviewing licensed design engineers and discipline leads to ground product decisions in real practice rather than industry assumptions.
- AI for technical document understanding
- Cross-discipline coordination workflows
- Code compliance automation (IBC, NEC, NFPA, IPC, IMC, ASCE)
- Structural and MEP drawing review systems
How this page was researched: Dimension checks are built around architectural, structural, and MEP sheets in PDF drawing sets: dimension strings, plans, elevations, sections, grid lines, stated drawing scales, and room, door, window, and equipment schedules.
Last reviewed by Manas Gandhi · October 2026