Coordinate risk when a New Zealand contractor's scope changes

A contractor is booked to repair one pump, then discovers a second fault in a neighbouring plant room. The extra work may seem minor, but the location, isolation, people nearby and specialist skills may all have changed. The original agreement and induction may no longer describe what will happen. The host business and contractor need a practical way to pause, exchange information and agree controls before the changed work begins.

This guide covers risk coordination at the moment a contractor's task changes. It is separate from initial prequalification, a generic contract variation or a broad explanation of overlapping PCBU duties. WorkSafe New Zealand's guidance for PCBUs working together explains that businesses in a shared workplace or contracting chain must consult, cooperate and coordinate so far as reasonably practicable. They cannot contract out of their health and safety duties. The required depth of reassessment depends on the actual work and risks, not a fixed universal change form.

Recognise a real scope change

A change may involve a different task, work area, method, equipment, substance, subcontractor, crew, shift or interaction with other operations. Even when the purchase order value is unchanged, the safety plan may need revisiting. Encourage workers to report a deviation before improvising. The supervisor should ask: what was approved, what is now proposed, what new hazard or interface appears, and who controls it?

Record the existing work description and the proposed difference in plain language. “Extra maintenance” is not enough if the new work requires roof access or electrical isolation. Identify the physical area and any people affected, including other contractors, occupants and visitors. The change record should point to the original risk assessment or method, but should not silently edit the original history.

Pause the affected part of the job

Do not allow a worker to continue on the assumption that a later signature will make the change safe. Stop the affected task, secure equipment and maintain any existing isolation. Other unaffected work may continue if it remains controlled, but the decision should be explicit. If the changed work has already started, address immediate risk first and record what happened.

The host and contractor should identify who has authority to agree the revised activity. That may include an area controller, specialist engineer, permit issuer or clinical lead depending on the site. A contract administrator may approve cost but lack competence to approve a technical control. Keep commercial approval distinct from safety authorisation.

Exchange new risk information

The host may know that an adjacent line is live or another crew will use the access route. The contractor may know that its replacement tool creates dust, heat, noise or a lifting operation. WorkSafe's guidance on overlapping duties emphasises coordination according to each business's influence and control. Share the relevant information in both directions; a one-way upload of the contractor's form can miss the host's changing workplace conditions.

Review task controls, competence, supervision, emergency arrangements and interactions with other work. If a permit, isolation, site-specific safety plan or work method is required, update it through its own approval process. A change log does not replace a competent technical assessment or permit. Do not claim that every change needs the same document set or that software can decide the legal threshold.

Assign the revised controls and briefing

For each new control, name the PCBU and person able to act, the time it must be in place and the evidence of completion. A barrier may be installed by the host, while the contractor revises its method and another business pauses deliveries. Record who will brief the changed work to the people actually doing it. A revised plan that remains in an office folder will not protect the worker at the new location.

For a substitute worker or subcontractor, check relevant capability and induction rather than inheriting an earlier person's approval. If the job crosses into a new area, update access permissions and local emergency information. If the work has become too complex for the contracted team, refer it for specialist review or reprocurement instead of stretching the original approval.

Example: repair extends into an occupied corridor

A service contractor is replacing a valve in a plant room. Testing reveals a leak in pipework above an occupied corridor. The contractor proposes opening the ceiling immediately. The host pauses the extra work, checks building services and occupant movement, and agrees a restricted work window. The contractor revises its method and confirms the staff and access equipment. The facility team arranges temporary segregation and informs those affected. A named person verifies the controls before work restarts. The record links the original valve job to the added corridor work and the separate decision to proceed.

The example shows coordination, not a universal rule that the host or contractor must own every specific control. Each party's actual influence and control matters.

Close the change and check the outcome

After the work, confirm the changed scope performed, systems returned to service, barriers removed or retained, residual defects, test records and handover to the host. Keep the revised documents and briefing evidence linked to the change. If the work cannot be completed, record the safe state and who owns the follow-up. A “job complete” status should not conceal an unresolved isolation or inspection.

Review repeated scope changes across suppliers. They may show weak original scoping, poor access to asset history or a contractor selling variations after arrival. Improve the planning conversation and information shared before future work rather than simply adding more approval fields.

For current-product discussion, see Complys New Zealand contractor management software. This guide does not claim Complys approves a method, issues legal permits, coordinates PCBUs automatically or authorises unsafe work.