A Temporary Works Coordinator (TWC) is a competent person appointed by a contractor to coordinate the planning, design, checking, implementation, use and dismantling of temporary works on a construction project. Under BS 5975-1:2024 and CDM 2015, the TWC ensures designs are produced, independently checked and correctly implemented—and holds explicit authority to stop unsafe work. The role covers falsework, formwork, scaffolding, excavation support, propping, façade retention, crane and piling bases, hoardings and any engineered short-duration structure that enables the permanent works.

The Health and Safety Executive is clear: BS 5975 is voluntary, but the duty to plan, manage and monitor temporary works is not. Under CDM 2015 Regulation 13 and Sections 2 and 3 of the Health and Safety at Work etc. Act 1974, that duty is statutory. A prosecution does not ask whether you used BS 5975—it asks how you controlled the temporary works, and BS 5975 is the yardstick the inspector, the insurer and the court will reach for.

Why the TWC Role Exists: Coordination as a Control Function

Construction remained the UK sector with the highest number of worker fatalities in 2024/25—35 workers killed, at a rate of 1.92 per 100,000, roughly 4.8 times the all-industry rate. Temporary works contribute disproportionately to that figure because falsework collapses, scaffold failures and unplanned load transfers share a single weak point: coordination. The role was formalised after the 1974–75 Bragg Report into falsework collapses, which found repeatedly that no single person had been tasked with coordinating temporary works.

The most common misreading of the Temporary Works Coordinator role is also the most dangerous: treating the TWC appointment as a paperwork preference rather than an operational necessity. BS 5975-1:2024 defines the TWC as a procedural control role, not a design role; coordination is deliberately a wider responsibility than design. The Temporary Works Designer (TWD) produces the calculations and drawings. The Temporary Works Supervisor (TWS) is site-based, inspecting installation against the approved design. The TWC sits above both—ensuring the brief is right, the design is produced and independently checked, the register is maintained, permits are issued and changes are reviewed.

Core Responsibilities of the TWC

The Temporary Works Coordinator oversees all matters relating to temporary works across the project lifecycle. Key duties include:

  • Planning and coordination: Ensuring temporary works are identified early in project planning and integrated into the overall construction methodology and programme.
  • Design brief and design: Preparing or reviewing design briefs, ensuring designers have the correct loads, sequencing and site constraints.
  • Independent design checking: Ensuring designs are independently checked by a competent checker before implementation—a fundamental requirement under BS 5975.
  • Register and documentation: Maintaining a Temporary Works Register that tracks every temporary structure from design initiation through to dismantling and handover.
  • Permits to load: Issuing permits only after design, checking and site inspection confirm the structure is ready for use.
  • Monitoring and changes: Reviewing any changes to design, loading or sequencing during the construction phase.
  • Dismantling and handover: Ensuring temporary works are removed safely and formal handover procedures are followed.

Treating "TWC" as a new business-card line for the existing site agent, without a distinct scope and written authority, is the moment the control function collapses into the project's general pressure. Failures often occur where responsibilities are unclear, overlapping or not enforced, meaning that safety depends not only on processes but on clearly defined accountability across all roles under BS 5975.

Authority to Stop Work

The TWC holds formal authority to stop work on unsafe or non-compliant temporary works, written into the appointment and backed by the employing organisation's Designated Individual. The Designated Individual is a senior person—typically a director or senior manager with enough authority to influence company policy and resource allocation—who establishes the temporary works procedure, champions temporary works at leadership level, and appoints and supports TWCs and TWSs.

If the TWC cannot halt unsafe activity without escalating through layers of site management, the role has no real control. That authority must be explicit, documented and understood across the project team. Effective temporary works management led by competent Designated Individuals, TWCs and TWSs integrates design checking and inspection to prevent failure and maintain robust project governance.

Competence, Training and Appointment

BS 5975 requires the TWC to be competent, with the right skills, knowledge and experience. Competence typically includes qualifications, experience with similar temporary works, training and continual professional development. The Designated Individual defines what competent means in the organisation context for DI, TWC, TWS and designers. Appointing a TWC without verifying competence, or without providing adequate resources and support, undermines the entire system.

What the TWC Does NOT Do

The TWC is not the designer, not the site supervisor and not a checker. The TWC coordinates; they do not replace the specialist roles within the temporary works chain. This distinction is the single most confused point in the role. Mixing coordination with design or supervision creates role ambiguity and gaps in control. A responsibilities matrix is a structured document that defines who is responsible for each task within the temporary works process, mapping roles against key activities such as preparing design briefs, carrying out design and checks, maintaining the Temporary Works Register, conducting risk assessments, inspecting temporary works, issuing permits and monitoring. In practice, it acts as a coordination tool, reducing ambiguity and improving communication across the project team.

Connection to CDM 2015 and Building Safety Act 2022

CDM 2015 sets out general legal duties for clients, designers, principal designers, principal contractors, contractors and workers. All the usual CDM duties apply to temporary conditions as much as to permanent works: managing and coordinating health and safety risks, eliminating hazards where reasonably practicable and otherwise reducing risks, and ensuring cooperation, communication and coordination across the project team. Where temporary works are involved, CDM requires that they are properly designed, coordinated and integrated into the overall construction methodology and programme. Although BS 5975 is not law, it represents industry consensus on good practice for temporary works management. Following BS 5975 is therefore a strong indicator that an organisation is meeting its CDM duties.

The integration of temporary works control with Building Information Modeling and digital construction platforms is an emerging area. As projects move toward greater use of telematic systems, BIM and digital tools, temporary works registers and permit systems are increasingly being embedded in project management software, allowing real-time tracking and audit trails.

Failure Patterns and What Comes Next

Common failure patterns in TWC implementation include appointing a TWC without clear scope or authority, failing to maintain an up-to-date register, issuing permits before checks are complete, and not reviewing changes to design or loading. These gaps turn a procedural control into a tick-box exercise. Where projects involve multiple contractors, complex sequencing and constrained working environments—such as in London—failures often occur where responsibilities are unclear, overlapping or not enforced.

The next step in temporary works management is tighter integration with digital construction workflows, automated compliance checking and real-time monitoring. As the Building Safety Act 2022 raises the bar for accountability and traceability in construction, the TWC role will likely become more prominent, with clearer lines of duty and more rigorous competence requirements across the supply chain.