Title Blocks & Drawing Issue Best Practice: The Irish AEC Guide

The title block is the most important 5% of any engineering drawing. Every downstream user — the contractor on site, the fire officer reviewing the FSC submission, the planning inspector, the FM engineer in 20 years — reads the title block first. A wrong revision number in a title block has caused contract disputes on Irish projects. An unpopulated "Project Name" field in a planning submission has required a resubmission with a six-week delay. A missing IFC date on a construction drawing has led to the wrong revision being built. The title block is not administrative overhead — it is the drawing's identity document.

The Standard: BS EN ISO 7200:2004

BS EN ISO 7200:2004 defines the minimum information that must appear on a technical drawing title block. It specifies mandatory fields, their arrangement and the minimum character height for each field. Irish AEC practices are not legally required to use BS EN ISO 7200, but following it ensures interoperability with Irish planning authorities, construction firms and downstream BIM tools that parse title block metadata automatically.

Sheet Sizes and Title Block Placement

Irish AEC drawings use ISO A-series sheet sizes exclusively — metric, always. The most common sheet sizes by project type:

• A0 (841×1189mm): site plans, large complex floor plans, coordination drawings
• A1 (594×841mm): standard engineering floor plan sheets, elevation and section drawings
• A2 (420×594mm): details, schematics, small floor plans
• A3 (297×420mm): diagrams, schedules, simple details — useful for planning appendices

Title block position: always bottom-right corner on landscape sheets; bottom of sheet on portrait orientation. Leave a 25mm left margin for filing — this is the AEC UK convention adopted in Irish practice. The drawing frame (border) is typically 10mm inside the sheet edge, with the 25mm filing margin on the left side only.

Revision Blocks — Getting the Protocol Right

The revision table sits within or immediately above the title block and records every issue of the drawing chronologically. Each row records:

• Rev: P1, P2, P3... then A, B, C... (or 1, 2, 3 depending on practice convention)
• Date: DD/MM/YYYY
• Description: specific, not vague — "Grid E column size revised from UC254×254 to UC305×305" not "Updated"
• Drawn: drafter initials
• Checked: checker initials
• Approved: approver initials

Revision clouds and delta triangles: every change between revisions must be circled with a revision cloud (REVCLOUD command in AutoCAD) and marked with a delta (triangle) containing the revision letter or number. The cloud must surround only the changed area — not the entire drawing, not just the title block. This tells the contractor on site exactly which part of the drawing changed, without requiring a full redraw comparison.

Issue Status Codes on Irish Projects

Issue status in the title block communicates the purpose and authority level of the drawing:

• P1, P2, P3 — Preliminary; internal review only; not for construction
• IFR — Issued for Review; to client or other disciplines for comment
• IFT — Issued for Tender; contract-quality drawings for pricing
• IFA — Issued for Approval; to planning authority, fire officer or client for formal approval
• IFC — Issued for Construction; contract document status; triggers contractor entitlement
• AFC — Approved for Construction; contractor-stamped and returned IFC
• AB — As-Built; final record drawing for H&S file

Dynamic Attributes in AutoCAD Title Blocks

Manual population of title block fields on every drawing is time-consuming and error-prone. Dynamic attributes eliminate both problems. The workflow:

1. Use ATTDEF to create named attribute definitions within the title block block: PROJNO, PROJNAME, DRWNO, DRWTITLE, REVNO, DRWSCALE, DRWDATE, DRWNBY, CHKDBY, APPRVBY
2. Use the FIELD command to link DRWDATE to the drawing's file save date automatically
3. Set up Sheet Set Manager (SSM) with project-level fields — PROJNO and PROJNAME defined once at project level populate all sheets automatically
4. Sheet-level fields (DRWNO, DRWTITLE, REVNO) are set per sheet in the SSM sheet list and push to the title block on plot
5. Use ATTSYNC to update all instances of a title block after modifying the block definition

The result: on a 50-drawing project, changing the project name requires one edit in Sheet Set Manager — not 50 individual title block edits.

Revit Title Blocks for Irish Hybrid Projects

On projects where AutoCAD and Revit are used simultaneously (common on Irish projects in transition to BIM), title block consistency between the two platforms matters for client perception and document control. In Revit, title blocks are families (.rfa). Key considerations:

• Shared parameters in Revit allow project information (client name, project number) to populate all sheet title blocks from a single Project Information entry
• The Revit Sheet List schedule can replicate the drawing register, pulling drawing number, title, revision and issue date directly from sheet properties
• Visual consistency: match font sizes, field positions and revision block layout between AutoCAD and Revit title blocks — they will appear in the same transmittal
• ISO 19650 CDE metadata: Revit shared parameters can be used to store IFC filename convention fields, ensuring the model and its issued drawings share the same project/document identifiers

The 10 Most Common Title Block Errors on Irish Projects

1. Scale field blank or showing "1:NTS" with no actual scale indicated — unacceptable for any construction-phase drawing
2. Revision field showing "A" in the block but revision cloud says "B" — mismatch causes serious confusion on site
3. Date format inconsistent — some sheets DD/MM/YYYY, others MM/DD/YYYY on the same project
4. Project name incorrect or abbreviated differently across drawings in the same set
5. Drawing number doesn't match the drawing register — indicates the register was not used as the source of truth
6. Issue status blank or showing "P1" on a drawing being used for construction
7. Ordnance datum not stated on site drawings — creates ambiguity on whether levels are MSL Malin Head or local datum
8. Copyright notice missing on architectural drawings — relevant under Irish design right law
9. Checked-by field blank — indicates no QA review was performed
10. Title block still contains placeholder text (PROJECT_NAME, DRAWING_NO) — indicates the block was not properly populated before issue