Temporary Works Coordination (PC Perspective): Responsibilities, Interfaces, and Evidence to Keep

TL;DR

• Temporary works usually go wrong at interfaces and handovers; the PC’s job is to control roles, information, change and checks on site.
• Set a project temporary works procedure: define what counts, categorise risk, map the workflow, and state what evidence must be kept and where.
• Appoint competent TWC/TWS and make authority clear; manage design briefs, revisions, permits/hold points, and “permission to load/strike”.
• Use a live temporary works register linking each item to design/check status, briefings, inspections, defects/actions and close-out.
• Align temporary works control with principal contractor duties cdm 2015 so you can demonstrate planning, management and monitoring.

Note to the reader: The information on this page is for general guidance only. For project specific advice, consult a competent professional.

Temporary works rarely fail because nobody “did the design”. They fail (or nearly fail) when the handovers, interfaces and checks between people and packages aren’t controlled on site. From a Principal Contractor (PC) perspective under CDM 2015, good temporary works coordination is about making sure the right roles are appointed, information flows, change is controlled, and inspections are recorded in a way you can evidence later.

This post sets out temporary works coordination responsibilities principal contractor teams typically need to put in place on non-domestic projects, with a practical focus on coordination and evidence (not taking on design responsibility).

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What “temporary works coordination” means for a Principal Contractor

In plain terms, temporary works coordination is the site system that makes sure temporary works are:

• Identified (so nothing “temporary” slips through unmanaged),
• Designed and checked by appropriate parties,
• Implemented as intended (correct sequence, materials, and restraints),
• Inspected/maintained for as long as they’re needed, and
• Changed/struck under control.

Under CDM 2015, the PC’s role is to plan, manage and monitor construction work so it is carried out without risks to health and safety. For temporary works, that means the PC must have effective arrangements that coordinate all parties and manage interfaces between permanent works, temporary works and the construction sequence.

Factual scope statement: This guidance focuses on Principal Contractor duties under CDM 2015 for non-domestic projects.

Factual role statement: CTC supports compliance; legal duty remains with duty holders.

Core temporary works coordination responsibilities (PC lens)

1) Establish a clear temporary works procedure for the project

As PC you’ll normally need a project-level procedure that:

• Defines what counts as temporary works on your site (including “borderline” items such as propping, edge protection fixings with structural implications, temporary stability, temporary openings, crane mats/platforms, temporary loading, temporary weathering, temporary traffic management interfaces, etc.).
• Sets out the classification/category approach (so higher-risk temporary works attract higher levels of checking and control).
• Explains the workflow from request → design brief → design/check → permit/authorisation → installation → inspection → change → strike.
• Establishes required evidence and where it is stored (common data environment, site file, permit system, inspection register).

2) Ensure competent temporary works roles are appointed and understood

The PC should make sure temporary works roles are clearly assigned for the project and that everyone understands the interfaces. Typical roles you’ll see include:

• Temporary Works Coordinator (TWC): coordinates temporary works on site, controls information flow, and manages permits/hold points in line with the project procedure.
• Temporary Works Supervisor (TWS): supports the TWC by supervising day-to-day implementation and checking installation aligns with the approved details.
• Temporary Works Designer (TWD): produces the temporary works design (often a specialist or subcontractor designer).
• Design checker (independent where required): checks the design to the agreed level (dependent on category/complexity).

From a PC evidence standpoint, what matters is that appointments are recorded, responsibilities are clear, and nobody is left assuming “someone else is covering it”.

3) Build temporary works into the construction sequence and logistics plan

Temporary works are often the critical path for safe progress. The PC coordination job is to align temporary works with:

• Programme and sequencing (including cure times, striking times, staged loading, and stability checks).
• Site logistics (deliveries, storage, access, exclusion zones).
• Work at height arrangements (scaffold alterations, loading bays, edge protection interfaces).
• Lifting operations and temporary stability during lifts.
• Public interface controls on non-domestic sites (hoardings, temporary barriers, segregation).

4) Control interfaces between temporary works and permanent works

Interface management is where PCs win or lose control. Practical interface checks include:

• Load paths: where loads go during each stage (including temporary loads from plant, materials, and concrete pours).
• Fixings and penetrations: what can and cannot be drilled/cast-in, and the approval route.
• Temporary stability: who confirms stability at each stage, especially when bracing is removed or altered.
• Sequence constraints: what must be in place before the next trade starts (e.g., props in place before demolition cut, ties installed before scaffold handed over).
• Change control: what triggers redesign/recheck (site queries, material substitutions, unforeseen ground conditions, rebar congestion, etc.).

What to put in place on site: practical controls that stand up as evidence

Appointments and competence evidence

Keep a simple, auditable record of:

• Named TWC/TWS appointments (project-specific).
• Competence evidence appropriate to role (training, experience summary, internal authorisation).
• Scope of authority (e.g., who can issue/close permits, who can accept handovers).

Temporary works register (live, owned, used)

A temporary works register is a practical control tool and an evidence trail. It should typically include:

• Unique reference for each temporary works item.
• Description, location, and package owner.
• Category/classification and required check level.
• Status fields (requested / designed / checked / approved / installed / inspected / in use / changed / struck).
• Linked documents (design brief, drawings, calculations where relevant, check certificate, inspection records, permits/hold points).

Design brief and design information controls

From a PC coordination perspective, the key is making sure the designer gets a workable brief and the site gets usable outputs. Your controls should cover:

• Design brief content: loading, geometry, constraints, sequence, access, erection/striking method, and known interfaces.
• Information version control: current revisions on site, withdrawn drawings removed from use.
• Design assumptions surfaced: what the design relies on (ground bearing, fixing types, concrete strength, tie patterns, max wind, etc.).
• Temporary works design change process: how site queries are raised and closed out before changes are made.

Briefings and communication: make it land with the people doing the work

Briefings are not “box-ticking” when they focus on what the crew needs to know today. Effective temporary works briefings usually include:

• What is being installed/altered and why.
• Critical “do not change” features (ties, props, toe boards, bracing, sole plates, exclusions).
• Hold points and who signs them off.
• What to do if something doesn’t fit (stop, isolate, raise a query).
• Inspection frequency and who to report defects to.

Evidence-wise, keep attendance and a record of what was briefed (link it to the temporary works register item).

Permits and hold points (authorisation before load/use)

Many temporary works need a clear “permission to load/use” moment. The PC coordination arrangement often uses:

• Permits to load/strike: for formwork/falsework, propping, backpropping, and staged loading.
• Handover certificates: for scaffolds and other access systems, with clear limitations.
• Hold points in RAMS: where following trades cannot proceed until temporary works sign-off is complete.

Make hold points visible: in the programme, in daily briefings, and in supervisor check sheets. If it’s only in a PDF nobody reads, it won’t control anything.

Inspection and monitoring records (during use, after change, after events)

Temporary works often degrade or get altered under pressure. The PC should ensure inspections happen:

• At handover (before first use/loading).
• At suitable intervals while in use (frequency appropriate to the risk and environment).
• After modification (any change, however minor it seems).
• After adverse events (impact, high winds, heavy rain affecting the ground, vehicle strikes, unauthorised tampering).

Records should say what was inspected, where, by whom, what was found, actions raised, and when closed. Link defects/actions back to the register item so nothing disappears into general snagging lists.

Interfaces to watch: where temporary works coordination often slips

From a PC perspective, these are common pinch points worth actively managing:

• Multiple contractors touching the same temporary works: e.g., scaffold altered by one trade to suit another. Control who can instruct changes and how it is re-inspected.
• “Temporary” becoming semi-permanent: temporary openings, barriers, loading restrictions, or propping that stays for weeks. Ensure ongoing inspection and clarity of ownership.
• Ground and bearing capacity: crane mats, scaffold bases, temporary roads—conditions change with weather and site traffic.
• Late design changes: permanent works changes that affect temporary stability or loads. Ensure your change process flags temporary works impact every time.
• Out-of-hours alterations: night shifts and weekend works. Make sure authorisation and records don’t stop at 5pm.

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A short site anecdote: the value of a simple hold point

On one project, a site manager noticed the following day’s concrete pour had quietly grown: an extra area was added to “make use of the pump”. The formwork layout looked broadly the same, so the team assumed it was fine. The Temporary Works Coordinator asked one question at the afternoon briefing: “Has the pour sequence changed from the design brief?” It had.

Because the job had a clear hold point—no pour until the TWC confirmed the temporary works design still matched the sequence—the team paused, raised a query, and the designer confirmed additional backpropping was needed for the revised sequence. The pour went ahead a day later, with the right props in the right places and a clear record of why the change happened and who approved it.

Evidence checklist: what a PC should be able to show

If you’re pressure-testing your arrangements, aim to be able to produce the following quickly and coherently:

Area	Typical evidence
Roles and control	TWC/TWS appointments; defined scope/authority; competence evidence proportionate to role
Identification	Temporary works register with live status and ownership
Design interface	Design briefs; current drawings/revisions; design check evidence where required; closed-out design queries
Implementation control	Briefing records; RAMS with hold points; permits to load/strike; handover certificates with limits
Ongoing monitoring	Inspection records; defect/action tracking linked to each temporary works item; records after modification/adverse events
Change management	Documented process; records showing changes assessed, approved, and communicated before work continues

FAQs

Do temporary works coordination responsibilities make the Principal Contractor responsible for temporary works design?
No. The PC’s role is to plan, manage and monitor construction work, which includes making sure temporary works are properly coordinated: roles are appointed, designs are in place where required, interfaces are controlled, and the work is implemented and inspected as intended. Design responsibility sits with the party appointed to design the temporary works, and the PC coordinates the process so it is controlled and evidenced.

 

What should a Principal Contractor do first to get control of temporary works on a new site?
Establish a project temporary works procedure and register, then confirm the Temporary Works Coordinator and Supervisor appointments and how authorisations/hold points will work. Early clarity on what counts as temporary works and how changes are controlled prevents unmanaged items appearing later.

 

What is the single most useful piece of evidence for temporary works coordination?
A live temporary works register that links each item to the right design information, check/approval status, permits/hold points, and inspection records. It shows you have oversight and control, not just scattered documents.

 

How should a PC manage changes to temporary works on site?
Use a clear change process: stop and isolate where necessary, raise a query, confirm whether the change affects loads/sequence/stability, obtain revised design or confirmation, then re-brief and re-inspect before returning to use. The key is to avoid informal “small tweaks” that bypass design assumptions and inspection.

 

Do permits and hold points need to be complicated?
No. The best permits/hold points are simple, visible and consistently applied: who can authorise loading/striking, what must be checked first, and where the record is kept. Complexity often drives workarounds; clarity prevents them.

Summary (PC focus under CDM 2015)

For non-domestic projects under CDM 2015, the PC’s temporary works coordination responsibilities are mainly about control and evidence: appoint the right roles, run a live register, manage design and site interfaces, set clear permits/hold points, and keep inspection and change records linked to each temporary works item. That’s what turns temporary works from “background activity” into a managed part of the build sequence.

How we can help: If you want to sanity-check your PC temporary works arrangements and evidence set, speak to CTC about practical support to strengthen coordination while keeping legal duties with the duty holders.

Disclaimer

This resource is provided for general guidance only. Always consult a competent professional for project specific advice. No warranty or guarantee is given or implied regarding completeness, accuracy, or compliance.

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