None of the mistakes on this list are design problems. They’re organizational ones, the kind that have nothing to do with whether a multifamily project’s unit layouts or life-safety systems are sound and everything to do with whether a reviewer, or the software a jurisdiction uses to pre-screen a submittal, can process the drawing set at all. One municipal digital submittal standard states the stakes plainly: failure to meet its formatting and sheet-numbering requirements “will delay plan and document approval, ultimately delaying the issuance of a permit,” regardless of what the drawings actually show.
Seven sheet-index mistakes that commonly delay a multifamily permit review: duplicate sheet numbers, mixed page orientation or size within one set, malformed sheet numbers (wrong discipline letter, spaces, special characters), deleted sheets without a proper strike-through label, reused sheet numbers on inserted sheets, partial resubmittals, and non-compliant file formatting.
Who this is for
This is for multifamily developers and architects assembling a permit submittal who want to know specifically which sheet-index and numbering errors cause delays, based on real municipal digital submittal standards, rather than a general reminder to “double-check your drawings.”
1. Duplicate sheet numbers
A municipal digital document standard states it without qualification: duplicate sheet numbers are not permitted. On a large multifamily set with dozens or hundreds of sheets across multiple disciplines, this is one of the easiest errors to introduce during revisions, especially when sheets get added, removed, or renumbered late in the process, and one of the fastest for an automated pre-screening tool to catch and reject on.
2. Mixed page orientation or size within one set
Mixing landscape and portrait pages, or mixing page sizes outside a jurisdiction’s accepted range, causes more than a cosmetic inconsistency; one standard notes it can cause sheet numbering and stamping tools to target the wrong region of the page entirely, which can misplace approval stamps or review markup in a way that has to be caught and corrected before review can proceed cleanly.
3. Malformed sheet numbers
Sheet numbers have more formatting rules than they look like they should: starting with the correct discipline letter (A for architectural, S for structural, and so on), no spaces or special characters, no three letters together, no four digits together, and consistent, non-decorative fonts where characters like “1,” “l,” and “I” don’t look alike. A sheet numbered with a typo in its discipline letter, or formatted inconsistently with the rest of the set, reads to an automated check as a different kind of error than a human reviewer would assume, and gets flagged accordingly.
4. Deleted sheets without a proper strike-through label
When a sheet is removed from a set during revisions, the correct approach isn’t to delete its number from the index and move on; the sheet number has to remain visible with a strike-through and a “DELETED SHEET” label, so anyone tracking the set against a prior version can see exactly what changed and confirm nothing was silently dropped. Simply removing a sheet and letting the index renumber around the gap erases that audit trail.
5. Reused sheet numbers on inserted sheets
The mirror image of the deletion rule: when a sheet gets added during revisions, it needs a new, unique sheet number, not a number borrowed from a sheet that previously existed in that slot. Reusing a number creates exactly the ambiguity the deletion rule is designed to prevent, where a reviewer or tracking system can’t tell whether a given sheet number refers to the original content or the new insertion without digging into revision history.
6. Partial resubmittals
After a round of review comments, submitting only the revised sheets rather than the complete, current plan set is a common shortcut that most jurisdictions explicitly reject. One standard is direct about it: partial submittals are not accepted, and a resubmittal has to include the full plan set every time, even for sheets that didn’t change in that revision round.
7. Non-compliant file formatting
Beyond the drawings themselves, the digital file carrying them has its own set of pass/fail requirements: no password protection, files under a jurisdiction’s size limit (200MB in the standards reviewed here), scans at or above a minimum resolution, and no leftover artifacts like unflattened AutoCAD text objects. A technically correct drawing set delivered in a file that fails any of these checks gets stopped before a reviewer ever opens it.
| Mistake | Why it delays review |
|---|---|
| Duplicate sheet numbers | Automated pre-screening and manual tracking both fail on ambiguous references |
| Mixed orientation/size | Misplaces stamps and markup; flagged by formatting checks |
| Malformed sheet numbers | Reads as a different error category to automated systems than to a human |
| Deleted sheet without strike-through label | Breaks the audit trail against the prior submission |
| Reused sheet number on an inserted sheet | Creates ambiguity between old and new content at that number |
| Partial resubmittal | Most jurisdictions reject outright; full set required every round |
| Non-compliant file format | Stops review before a human reviewer opens the file |
If your multifamily drawing set keeps getting flagged for formatting or indexing issues rather than design content, send us a scope: your current sheet index and target jurisdiction, and we’ll tell you plainly what needs cleanup before the next submittal.
