AEC definitions
A title block is the ruled area on a drawing sheet, usually along the right edge or the bottom, that identifies the project, the sheet number and title, the author, the date, the scale, and the revision history. It is how you tell one issue of a sheet from another.
Definition
Everything inside the border is the drawing. The title block tells you what that drawing claims to be. A sheet without a matching title, number, and revision cannot be placed reliably in a set. Issued-for-construction, permit, and bid are purposes stated here, not in the file name. Seals and signatures live here or beside it. A plot that crops the title block has thrown away the identity of the sheet.
In depth
A-101 means something in a set that follows a discipline prefix. The index and every reference bubble use that number. Changing a number without updating the bubbles orphans the details.
The sheet title should say what the drawing is: Level 1 floor plan, not 'Plan'. Vague titles make the index useless when the set is large.
Each issue gets a number or letter, a date, and a description. Clouds on the drawing correspond to the current revision. A sheet that was revised in the model but not in the title block will be treated as the old sheet by anyone who checks.
Do not reuse a revision number. Do not leave 'REV' blank on an issued set. Addenda and bulletins should appear in the history of every sheet they changed, not only on a narrative cover memo.
An architect's or engineer's seal, with a signature and date, is what makes an issued sheet a professional document in jurisdictions that require it. A company logo is not a seal. A draft plot with a placeholder seal is not issued.
Consultant sheets carry the consultant's seal. The architect's seal on a cover sheet does not seal the structural calculations. Know which block belongs to which professional.
Wrong paper size, a viewport that clips the border, or a PDF export of the model without the sheet all produce a drawing you cannot identify. Field sets should be plotted so the revision and the number are readable.
Digital sheet-comparison tools still need the title block, because the revision description is text, not geometry. A cloud with no matching revision line is incomplete.
A consistent title block means a reviewer can find the date, the scale, and the 'do not scale' note without hunting. Project name, address, and client should match the agreement. An old project's name left in the block is how sheets from two jobs get mixed in one PDF.
North arrow and location map sometimes sit just outside the block. They are part of the sheet furniture. They still have to be updated when the plan is rotated.
Examples
Sheet A-201, revision 3, dated for the issued-for-construction set, matches the row in the sheet index. The seal is signed.
A detail export emailed to the field has no title block. The superintendent asks for the issued sheet number before anyone builds from it.
Addendum 2 revises the door schedule. The title block on that sheet records addendum 2. The floor plan, which did not change, keeps its prior revision.
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