Most Common Plan Check Issues by Discipline

Every discipline has its own recurring failure patterns in plan check review. This is a roundup across architectural, structural, mechanical, electrical, plumbing, fire protection, and civil, pulling together the issues that show up most consistently across projects.

Architectural

Accessible path of travel gaps, where a route is compliant at individual points but breaks down somewhere along its full length, are among the most common architectural plan check comments. Fire compartmentation completeness, rated walls that aren't shown continuously to the structural slab above, and egress travel distance calculations that don't get rechecked after late floor plan changes round out the recurring list. Adaptable and livable housing notation gaps show up specifically on multifamily and residential projects.

Structural

Connection detail omissions, a beam-to-column or brace-to-frame connection referenced on a framing plan but never actually detailed, are the most frequent structural gap. Coordination mismatches with architectural column locations and floor-to-floor heights, and load path interruptions from later design changes that weren't rechecked against the structural design, are close behind.

Mechanical

Equipment tagging inconsistencies between schedules and floor plans, incomplete equipment details, and volume damper coordination gaps between BIM models and 2D documentation are recurring mechanical issues. Ductwork routed without adequate coordination against structural framing, creating above-ceiling clashes, is one of the most common cross-discipline mechanical failures.

Electrical

Panel schedule and one-line diagram mismatches are the single most common electrical plan check comment. NEC working space clearance violations, panel overloading, missing GFCI protection, and breaker-to-wire coordination errors are close behind, along with equipment voltage mismatches between schedules and floor plans.

Plumbing

Pipe sizing that doesn't account for flow velocity, pipe routing conflicts with structural or other MEP trades, and wet area waterproofing continuity gaps at showers, thresholds, and balconies are the most frequent plumbing issues. Balcony and terrace membrane continuity failures carry particularly high stakes given their construction defect claim history.

Fire Protection

Sprinkler coverage gaps caused by ceiling obstructions added after initial sprinkler layout, fire door schedule inconsistencies between the schedule, floor plan tags, and life safety plan, and shaft enclosure integrity gaps are the most common fire protection issues. Penetration fire-stopping documentation gaps and undocumented fire resistance level requirements round out the list.

Civil

Boundary and grade matching conflicts at property lines, stormwater drainage direction ambiguity, and earthwork quantity mismatches between the grading plan and the earthwork summary are frequent civil issues. Basic documentation gaps, missing benchmark references, incomplete title blocks, missing engineer seals, are surprisingly common causes of plan check rejection despite being unrelated to the underlying engineering quality.

The Pattern Across All Disciplines

Two patterns repeat across every discipline covered here. First, cross-discipline coordination failures, where each discipline's own drawings are internally correct but conflict with another discipline's work, are consistently a larger source of issues than single-discipline errors. Second, documentation consistency gaps, where the same information is shown correctly in one location and inconsistently somewhere else in the set, show up as a recurring failure mode regardless of discipline.

Both patterns point toward the same conclusion: systematic, cross-referenced checking across a full drawing set catches more of these issues than reviewing each discipline's drawings independently, since so many of the recurring problems live at the boundaries between disciplines and documents rather than within any single sheet.

FAQ

Which discipline generates the most plan check comments on a typical project? This varies by project type and complexity, though architectural and MEP coordination issues together tend to generate a large share of comments on most commercial projects, given how much of the drawing set volume and cross-discipline complexity concentrates there.

Are these issues equally likely on every project type? No. Multifamily projects see more repetition-based errors given repeated unit types, healthcare and lab projects see more cross-referenced compliance complexity, and civil-heavy projects like site development see more documentation completeness issues specific to civil sheets.

Does automated review catch issues across all these disciplines equally well? Structured AI's check library spans structural, architectural, mechanical, electrical, plumbing, fire protection, and civil disciplines, with checks specific to each. Coverage depth varies by how many named checks exist for a given condition, which continues to grow as firms define additional standards worth checking.