MEP Pre-Permit Review That Maps Every Code Citation to Drawing Reality
Plan reviewers check the implementation, not the code summary. Your internal review should too.
MEP plan check is brutal because every discipline has its own code thicket. Mechanical engineers face IMC, ASHRAE 62.1, and ASHRAE 90.1. Electrical engineers face NEC and local utility requirements. Plumbing engineers face IPC, ASPE, and water authority requirements. Each code has dozens of dimensional and citation-style requirements that get checked sheet by sheet, not just on the cover. Helonic was built to map every relevant code citation against the actual drawing implementation.
Why MEP plan check correction notices cluster
The MEP plan check correction notices we've reviewed cluster around the same items: NEC 110.26 working clearances at electrical panels, IMC outdoor air rates, IPC fixture counts for occupant load, NFPA 13 sprinkler coverage at obstructions. These are all dimensional checks that get verified sheet by sheet by the plan reviewer. They're exactly where AI excels.
How Helonic helps
Multi-code parallel checking
IMC, ASHRAE, NEC, IPC, NFPA all run simultaneously against the drawings - not sequentially by an engineer with a code book.
Working clearance verification
NEC 110.26 working clearances at panels, transformers, and switchgear checked against drawn equipment locations.
Ventilation rate verification
Outdoor air rates per IMC and ASHRAE 62.1 checked against actual equipment selection and zone configuration.
Fixture count compliance
Plumbing fixture counts checked against IPC requirements for the building's occupancy and occupant load.
Example issues Helonic catches
Real-world issues detected by AI analysis, specific to mep engineers running pre-permit review:
Electrical panel P-3 in mechanical room shows 32" front clearance - NEC 110.26(A)(1) requires 36" min for the equipment voltage
Outdoor air rate calculated 0.06 cfm/sf for office occupancy - ASHRAE 62.1 requires 0.06 plus 7.5 cfm/person, occupant-based portion not included
Plumbing fixture count for 387-occupant assembly shows 8 WCs, IPC Table 2902.1 requires 10 for that occupant load
Sprinkler heads at corridor show 12'-0" spacing in light hazard, NFPA 13 max is 15'-0" but obstruction within 4'-0" violates 8.6.5
Transformer XFMR-1 shown adjacent to combustible storage with 0" separation - NEC and IFC require clearances
Energy code envelope U-factor on schedule doesn't match ASHRAE 90.1 climate zone requirement for the project location
Key features for this workflow
NEC 110.26 working clearance verification at every panel and switchgear location
IMC and ASHRAE 62.1 ventilation rate calculation from drawings
ASHRAE 90.1 energy compliance check against equipment selections
IPC fixture count compliance for occupancy
NFPA 13 sprinkler coverage and obstruction check
Code citation verification against adopted edition
MEP pre-permit workflow
Upload MEP drawings
Mechanical, electrical, plumbing, fire protection all indexed together.
Confirm code editions
IMC, NEC, IPC, NFPA editions per jurisdiction adoption.
Run multi-code compliance
All codes checked in parallel against drawings.
Resolve high-severity findings
Dimensional violations and clearance issues first, then citation discrepancies.
What construction professionals told us
“MEP engineers we talked with said the time-consuming part of pre-permit isn't the design - it's verifying that every dimensioned compliance requirement is met on every drawing. They wanted a reviewer that wouldn't miss the 32-inch panel clearance on sheet E-204.”
Conversations with licensed MEP engineers including PEs across mechanical, electrical, plumbing, and fire protection disciplines.
FAQs
Does it check load calculations?
Helonic checks documentation of load calculations and consistency between calculated values and equipment selection. It doesn't replace the load calc itself.
What about local utility requirements?
Helonic supports upload of local utility requirement documents and re-runs affected rules against the local standard.
Can it verify energy code compliance?
Helonic verifies prescriptive ASHRAE 90.1 compliance items visible on drawings. Performance-path compliance still requires energy modeling.
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: Conversations with licensed MEP engineers including PEs across mechanical, electrical, plumbing, and fire protection disciplines.
Last reviewed by Manas Gandhi · May 2026
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