Title blocks and sheet numbering

The title block is the only element on every sheet, which makes it the sheet's identity. Reviewers use it constantly — to confirm they are looking at the right project, the right revision, and the right code edition.

What belongs in it

Sheet N of M is not decoration. It is how a reviewer knows nothing was lost in upload, and how you prove later that a sheet was in the set.

Numbering that survives revisions

Number sequentially and group by discipline — cover, site, structural, electrical, schedules, labels, compliance. Then follow one rule:

Never renumber to insert. If you need a sheet between 4 and 5, it is 4A. Renumbering breaks every reference that already exists: the reviewer's correction list, your email thread, the inspector's notes, the revision tables on other sheets.

An inserted sheet with a letter suffix is standard drafting practice precisely because it is additive. Everything previously true stays true.

Revision level goes on every sheet

Including sheets that did not change. A reviewer needs to know the sheet in their hand is current. A set where sheet 3 says Rev 2 and sheet 7 says Rev 1 is a set nobody can trust.

The code edition is a real field

Jurisdictions adopt NEC editions years apart, and the differences are consequential — 230.85 emergency disconnects arrive in 2020, rapid-shutdown language changed in 2017 and again in 2023. Stating "2023 NEC" tells the reviewer what you designed against; omitting it invites them to assume.

Small things that read as care

• Keep the content band clear. Nothing overlapping the header or footer rules.
• Same title block on every sheet, same position.
• Legible at print size. Design at 11x17 and check at 11x17, not zoomed in.
• A verification affordance. A QR or fingerprint that lets a reviewer confirm the set has not been altered since it was sealed is unusual enough to be noticed — favourably.

OneLine Studio stamps the title block from the project record, prints the code edition it validated against, and can carry a scannable design seal so any submitted sheet can be checked against the compliance-checked lineage it came from.

See also: what is in a solar permit set and revision clouds and resubmittals.

> Design aid — a licensed electrician or PE must review and stamp before filing.

Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.