Principal contractor duties checklist

Under Great Britain's Construction (Design and Management) Regulations 2015, a principal contractor is normally appointed by the client for a project involving more than one contractor. The principal contractor controls the construction phase and must plan, manage, monitor and coordinate it so the work is carried out without risks to health and safety so far as reasonably practicable. The role is more than collecting subcontractor RAMS. It includes the construction phase plan, cooperation between contractors, site induction, welfare, worker engagement, access control and continued liaison with the client and principal designer.

The checklist below turns HSE's principal-contractor duties summary into evidence a project team can use. It is a management aid, not a certificate that a project is legally compliant. Adapt it to the work, site and appointment. Domestic client arrangements can allocate client duties differently; check those separately rather than copying a commercial-client model.

Before accepting or starting the role

HSE says the principal contractor must have suitable skills, knowledge, experience and, where relevant, organisational capability for the project. A familiar project type does not excuse a missing specialist skill. For example, a contractor managing a simple internal fit-out may need additional engineering, demolition or contaminated-land capability if the scope changes. Record how a capability gap will be filled before taking control of the affected work.

The client's CDM duties and the principal designer's duties remain distinct. The principal contractor should obtain needed information and cooperate with them, not silently assume their appointments or information duties are fulfilled. On a domestic project, HSE explains that client duties normally pass to another dutyholder; confirm the actual arrangement.

Construction phase plan and coordination

Before the construction phase begins, prepare a written construction phase plan, implement it, then review and revise it as the project develops. The plan should be proportionate to the work and address the arrangements and site rules that make control possible. A document generated before the detailed programme, service information or subcontractors are known may need significant updating; its existence alone is not evidence that the site is ready.

Put the high-risk interfaces into the plan and programme: one trade drilling while another is isolating services; lifting over occupied routes; demolition near temporary support; hot work beside stored combustibles; deliveries crossing pedestrian access. Make the responsible person, exclusion, permit, inspection and handover visible. Schedule the work so incompatible tasks do not overlap simply because both fit the same date.

HSE requires the principal contractor to liaise with the client and principal designer for the duration of the project. Where a design changes after work begins, ask what new risk it creates, whether the PCI or design risk information changes, and whether the plan, RAMS, permits or competence need revision. Keep a dated decision trail. The principal designer should be told about information relevant to its continuing pre-construction coordination; the principal contractor remains responsible for construction-phase coordination.

Contractors, workers and site entry

Appointing contractors. Check that the people or firms appointed have the skills, knowledge, experience and organisational capability needed to carry out their work without risks to health and safety. Ask for evidence relevant to the task rather than a generic certificate set. Confirm supervision and any specialist licences or authorisations where the work requires them. The principal contractor should coordinate contractors' work and check that each understands the parts of the construction phase plan and site rules relevant to it.

Induction and information. Ensure every worker has a suitable site-specific induction and the information or further training needed for the risks. A generic online induction cannot replace information about today's access, welfare, fire arrangements, restricted areas, current services and overlapping work. Record who attended, the version used and what additional briefing was given. HSE's site-rules and induction guidance notes that site rules should be clear and understandable and cover items such as hot work, traffic, permits and emergencies as relevant.

Access control. Take reasonable steps to prevent unauthorised access, including by the public or occupants. The site boundary, gates, hoarding, signs, deliveries and after-hours conditions must reflect the actual site. A retail refurbishment or occupied residential block may need different arrangements from a fenced greenfield site. Check the arrangement when the work footprint changes.

Worker engagement. Consult and engage workers about health, safety and welfare. A toolbox talk can support this, but it is not the whole duty. Ask workers about defects in the planned method, access, welfare and interfaces; record actions and tell them what changed. A worker who discovers a new cable or unstable ground needs a known stop-and-escalate path.

Welfare, emergency and monitoring checks

Suitable welfare must be available from the start and maintained. In a multi-contractor site, agree who provides, cleans, replenishes and checks facilities. Do not assume a nearby cafe or a future site cabin makes the opening shift compliant. HSE's principal-contractor page identifies welfare as a continuing duty.

Monitor controls in the field. The principal contractor's manager should check that the plan is actually being followed: barriers remain in place, excavations are inspected, workers are briefed, temporary works hold points are respected, permits are live and plant routes are segregated. Record findings, corrective actions and who verifies closure. A monthly spreadsheet review cannot see a missing edge barrier at 9 a.m. today.

Review the emergency plan for changes in fire risk, access, work at height, excavation, confined space or occupied-site interfaces. A rescue plan must be workable with the people and equipment actually present, not just a statement to call emergency services. Ask whether a nearby contractor's activity has changed the escape route or emergency access.

Copyable live-project checklist

Use this as a short management record. Each “Yes” needs a reference to current evidence; “No” needs an action owner and interim control. “Not applicable” needs a reason.

Review date and trigger: [ ]. Manager who reviewed it: [ ]. Outstanding critical controls before work proceeds: [ ]. A checklist should be refreshed after design, programme, contractor or site-condition changes. It is a live record of decisions, not a replacement for inspections and supervision.

Scenario: a second contractor joins mid-project

A small builder starts a refurbishment believing only its own employees will work. The client then appoints a separate electrical contractor. The team should confirm whether the project now involves more than one contractor and whether principal-contractor appointment and coordination arrangements are in place. The principal contractor reviews the construction phase plan, sequences isolation, cable work and the builder's drilling, updates site rules and briefings, and checks the electrical contractor's relevant competence and supervision. It records the information shared with the principal designer and client. The builder's original RAMS alone cannot resolve the new interface.

On a domestic project, the allocation of client duties may differ from a commercial project. HSE's domestic-client guidance explains the normal transfer and alternative arrangements. Confirm the project-specific position rather than applying the commercial-client field of a generic checklist unchanged.

Common mistakes

• Believing appointment paperwork is delivery. The site needs a functioning plan, people, welfare and monitoring.
• Treating subcontractor RAMS as the site coordination plan. The principal contractor must manage the interfaces between them.
• Leaving the CPP unchanged after the programme shifts. Material changes may invalidate access, welfare, sequencing and emergency assumptions.
• Checking competence only at company level. The actual worker, supervisor and specialist task may require separate evidence.
• Inducting once but not briefing change. Today's work can differ from the induction given weeks ago.
• Waiting for an incident to hear from workers. Consultation can reveal weak controls before harm occurs.
• Assuming the principal designer disappears on day one. Design information and risks can develop during construction; liaison continues.

Money-page relationship and next step

The relevant Complys commercial route is its construction phase plan page. The page describes a plan-generation workflow, but this checklist does not assert that any software can perform the principal contractor's legal duties, inspect the site, choose competent contractors or verify controls automatically. Confirm current implementation and commercial terms before using the link in a live CTA.

Next step: Use the table at the next site coordination review. Assign each gap to a named person, verify physical controls and update the construction phase plan where the work has changed. If an essential control is missing, hold the affected task until it is in place.

Writer-side source and QA record

Terminal writer-side disposition: READY.