Revision Control & Transmittals Done Right on Irish Construction Projects

A contractor building from a superseded drawing is one of the most common and most avoidable cost events in Irish construction. It happens because revision control failed: either the superseded drawing wasn't clearly marked, the transmittal wasn't acknowledged, or the site manager simply picked up the wrong PDF. On a NEC4 or FIDIC contract — the standard forms used on Irish NDP projects — the date a drawing was received by the contractor determines entitlement to programme and cost relief. Document control is not administrative overhead; it is contract administration, and getting it wrong is expensive.

The Cost of Getting Revision Control Wrong

The cost of document control failure on Irish construction projects is diffuse but real:

• A contractor builds 200m of cable containment to a superseded routing drawing — rework cost: €15,000–€40,000 depending on access difficulty
• An NEC4 Early Warning Notice is disputed because there is no documentary evidence of when the revised drawing was received — programme claim rejected, relationship damaged
• A planning condition compliance check fails because the planning officer's drawing set is at a different revision to the as-built — additional site inspection required
• A fire safety officer questions whether the installed system matches the FSC-approved drawings — without a clear revision trail linking approved drawing to constructed state, the answer cannot be given

Revision Numbering — Which System to Use

Ireland has no single mandated revision numbering system. In practice, two conventions dominate:

• Convention 1 (most common): P1, P2, P3... for preliminary/design-stage issues → then A, B, C... for construction-stage issues after IFC
• Convention 2 (numeric construction): P1, P2, P3... for preliminary → then 1, 2, 3... for construction-stage (avoids alpha/numeric confusion when revisions exceed 26)

The principle is consistency within a project. Mixed conventions across disciplines — architects using alpha, engineers using numeric — cause errors when construction teams correlate drawings from different sources. The Project Execution Plan (PEP) or BIM Execution Plan (BEP) should define the convention at project start.

Issue status codes used in Ireland:

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

The Drawing Register — Your Single Source of Truth

The drawing register (or document register) is the master list of all drawings on a project, tracking the current revision, issue date and issue status of every drawing. On a well-managed Irish project, no drawing is issued without an entry in the register, and no transmittal is sent without the register being updated first.

Minimum columns in a drawing register for an Irish project:

The Transmittal — Format and Fatal Mistakes

Every drawing issue must be accompanied by a transmittal — a document that records what was sent, to whom, and when. The transmittal is the evidence in any contract dispute about when drawings were received.

Required transmittal fields:

• Transmittal number (sequential, unique per project)
• Project name and number
• Date of transmission
• Transmitted by (practice name and individual)
• Transmitted to (recipient name and company)
• Method (email, CDE upload, hard copy — specify)
• List of drawings: Drawing No. | Title | Revision | Status | No. of copies
• Remarks (any conditions, actions required)
• Action required: For Information / For Review and Comment / For Approval / For Construction
• Response deadline (if applicable)

The fatal mistake: issuing drawings without a transmittal. On an Irish NEC4 contract, if the contractor claims they never received a revised drawing, and there is no transmittal showing delivery, the designer has no evidence. This has cost Irish consultants programme entitlements in adjudication decisions.

ISO 19650 and the Common Data Environment (CDE)

ISO 19650 — mandatory for Irish public sector projects above OGP thresholds — restructures document control around a Common Data Environment (CDE). The CDE has four states through which information passes:

• Work in Progress (WIP): Drawing is being produced — only visible to the author's team
• Shared: Drawing is issued within the project team for coordination — visible to all project participants on the CDE
• Published: Drawing is formally issued — to client, authority, contractor; becomes a contract-status document
• Archived: Drawing is superseded — moved to archive, not deleted. ISO 19650 explicitly requires retention of all superseded issues

ISO 19650 file naming convention: a 15-field naming structure that encodes project, originator, zone, level, type, role, classification, number, description, suitability and revision. This replaces ad-hoc naming conventions and enables automated document management across large Irish NDP project teams.

CDE Platforms on Irish Projects

Revision Clouds and Delta Triangles — The Protocol

In AutoCAD, every change between revisions must be marked with a revision cloud (REVCLOUD command) surrounding the changed area, and a delta triangle (a small equilateral triangle) containing the revision letter or number placed adjacent to the cloud. The delta is also recorded in the title block revision table with the same letter/number, date and description.

Common errors:

• Clouding only the title block — the cloud must surround the actual drawing change, not just confirm that a change occurred
• Using the same cloud from a previous revision without updating it — the cloud should show only the current revision's changes
• Vague revision descriptions: "Updated" — descriptions must be specific: "Containment route revised from Grid E to Grid F at Level 2"
• Forgetting to update the revision cloud when re-issuing at a new revision — multiple old clouds from prior revisions create confusion about what changed when

The Future — AI-Powered Document Control

Document control is one of the most mature areas for AI application in Irish construction:

• AI document classification: tools that read PDF drawings on upload and auto-populate transmittal fields (drawing number, title, revision, date) from the title block — reducing manual data entry in CDE platforms
• Computer vision revision detection: AI that automatically highlights differences between two revisions of the same drawing — overlaying changes visually without requiring a human to compare two PDFs side-by-side
• Autodesk ACC Document Intelligence (2025): automated metadata extraction and classification on upload to ACC
• Smart transmittals: ACC and Procore workflows that automatically generate a transmittal when drawings are published from the Shared state — removing the manual step that is most often skipped