RISK – Temporary Works not adequately designed
The Temporary Works Process and Competency Requirements Table must be used to confirm what controls, including level of design certification and design review, are required for temporary works.
Once you have identified whether the temporary work is considered a high, medium, low or very low, and the TWC has approved this risk categorisation, follow the controls outlined in the table below for minimum documentation and output, design and Site Validation requirements.
For example, design certification and documentation requirements are outlined in the table to the right for different levels of risk.
Risk Category |
Design Certification |
Design Documentation |
High (CAT 3) |
Design Certificate Design Check Certificate Proof Engineering Certificate |
Certified CAD Drawings Design Documentation and output in 3D (where appropriate) |
Medium (CAT 2) |
Design Certificate Design Check Certificate |
Certified sketch or CAD Drawings |
Low (CAT 1) |
Design / Supplier’s Certificate Design Check Certificate (where appropriate) |
Certified sketch or CAD Drawings |
Very Low (CAT0) |
Not required |
Not required |
Temporary Work Process and competency requirements table
Related GMRs
7.2 Identify, adequately scope and capture Temporary Works in the Temporary Works Register
7.B Complete a site validation prior to the initial use of temporary works
Related Procedures / Forms
Temporary Works Design Brief and Approval Form
Temporary Works Design Certificate
Temporary Works Design Check Certificate
Temporary Works Proof Engineering Certificate
Temporary Works Safety In Design SID Designers Risk Register