How do you designate a prime contractor in Alberta?

At an Alberta construction or oil-and-gas work site with two or more employers involved in work, a prime contractor must be in place. Under section 10 of Alberta's Occupational Health and Safety Act, the person in control of the site must designate the prime contractor in writing. If that person fails to do so, the Act deems the person in control to be the prime contractor. The prime contractor's name must be posted conspicuously at the work site. These are distinct steps: a purchase order naming a general contractor is not, by itself, proof that the statutory designation and site posting were handled.

The role is more than a title on a noticeboard. The prime contractor must establish, as far as reasonably practicable, a site system or process that supports compliance and cooperation, designate a person in writing for specified cooperation and worker-participation functions, coordinate hazard information, and conduct its own activities without exposing people to hazards so far as reasonably practicable. Individual employers still have their own duties. This guide walks through the designation decision, the evidence to keep and the handover needed to make the system work.

Does this site require a prime contractor?

Start with the kind of site and who is involved in the work. Section 10(1) covers construction and oil-and-gas work sites, and any other work site or class designated by an OHS director, where two or more employers are involved in work. Alberta's work-site-party guidance describes this as a mandatory prime-contractor situation. For other multi-employer industries, section 10(5) allows a person in control to make a written voluntary designation; it does not make that option a blanket legal requirement for every shared commercial building.

Record the actual employers and site boundaries before answering. Count the organisations involved in work, not merely the number of workers wearing different uniforms or the number of subcontracts on a procurement spreadsheet. The regulator's prime-contractor role guide explains that, for construction and oil-and-gas sites, the employers need not necessarily be working at the same instant for the multiple-employer condition to matter. A site manager should not avoid designation simply by scheduling trades on alternating days. Conversely, do not assume that every supplier delivery or visitor makes an organisation an employer involved in the work for this purpose; test the facts under the Act.

For example, a principal company running a single-site renovation uses an electrical subcontractor and a roofing subcontractor in successive phases. The organisation in control should examine the site as a whole and designate a prime contractor if section 10 applies. It should not treat each trade's separate attendance window as a new one-employer site without analysing the legal work-site boundary. If a campus has physically separate work sites, document the real boundaries and control arrangements rather than declaring one corporate name prime for every activity without an operational plan.

Who makes the designation?

Section 10(2) places the written designation on the person in control of the work site. That may require a factual review of site control, contractual arrangements and access authority. A property owner and a general contractor can have different roles; a contractual label does not automatically answer the statutory question. Resolve the identity before mobilisation, when the site plan, employer list and contracts are still being assembled.

The written record should identify the legal entities, the work site and scope, the effective date, the person accepting the role, the contact route and how a successor will be appointed if the work changes. The Act does not prescribe this article's suggested document layout. The point is to make the statutory appointment unambiguous and usable by every employer arriving at the site. A vague line in a tender saying that the successful bidder is responsible for safety may fail to tell workers who the prime contractor actually is for the current work site.

If the person in control fails to designate when required, section 10(3) deems that person to be the prime contractor. This is not a convenient fallback that removes the need to organise safety. The same person may also be accountable for the failed designation. There is an important statutory exception: sections 10(2) and (3) do not apply to a person in control of a work site that is a private dwelling occupied by that person. Do not generalise that exception to every residential project or claim that all other OHS duties disappear. Check the precise project and person against the current Act.

Where a non-construction, non-oil-and-gas multi-employer site chooses the section 10(5) voluntary route, use a written agreement. Once a prime contractor is designated, the duties attached to that role must be carried out. A shopping centre or facilities operation should not copy a construction-site template without considering its actual employers, overlapping work and control of common areas.

Post the name and communicate the role

Section 10(6) requires the prime contractor's name to be posted in a conspicuous place at the site. Put it where workers and incoming employers can find it, keep it legible and change it promptly if the designation changes. An internal appointment email known only to the owner and contractor does not meet the practical purpose of a site posting. Equally, a sign with no current named contact leaves subcontractors unsure whom to call when a shared hazard arises.

Tell each employer how to reach the prime contractor's safety contact, how to report hazards and incidents, and where the shared procedures are kept. Record the handover, particularly for a subcontractor arriving after the initial induction. The posting obligation is a legal minimum; making the role operational requires communication at the work face and across shifts. A notice at the gate does little if a night crew cannot reach the person responsible for isolating a shared service.

What does the prime contractor have to coordinate?

Section 10(7)(a) requires the prime contractor to establish, as far as reasonably practicable, a system or process to ensure compliance with the Act, regulation and OHS Code at the site, including cooperation between employers and workers. Section 10(7)(b) requires a person to be designated in writing for cooperation and the system addressing section 13(6) matters. That is a separate internal designation from the person-in-control's appointment of the prime-contractor organisation. The appointment document should therefore not be treated as the entire safety system.

Build a coordination plan around the work that can hurt another employer's workers. Map simultaneous or sequential activities, traffic and pedestrian routes, shared plant, energy isolation, excavations, lifts, temporary works, hazardous products, hot work and emergency arrangements. Agree who controls each interface. Collect each employer's work methods and hazard assessments where relevant, then check that the controls fit together. Two individually sound method statements can still conflict when one crew removes a guard while another expects it to remain in place.

Use a simple operating cycle: identify the incoming employer and its supervisor; exchange known hazards; check work and interfaces; give the site induction and controls; authorise the start under the agreed process; observe work; correct problems; and record the closeout. Make clear which decisions require work to pause. This is an operational example, not a claim that the Act prescribes a particular software workflow or that a checklist alone proves compliance.

Section 10(10) also requires the prime contractor to ensure the owner and each employer, supplier or service provider at the site is informed of existing or potential site hazards that may affect workers or other people. Hazard communication must go both ways: section 9 addresses owner communication, while employer and contracting-employer duties remain relevant. If one trade changes a temporary access route or exposes an electrical service, the update should reach the others before they rely on the old plan.

The prime contractor does not absorb every employer duty

The Act assigns obligations to employers, supervisors, contracting employers, owners and workers as well as the prime contractor. A subcontractor cannot say that the prime contractor's site plan has relieved it of supervising its people, assessing its work or providing training. Section 10(8) assigns particular equipment, infrastructure and excavation obligations to a prime contractor where work is done by or on its behalf; section 10(9) expressly says that does not relieve other responsibilities. Keep the duty map alongside the interface plan rather than describing the prime contractor as the only liable party.

For example, a civil subcontractor creates an excavation while an electrical contractor works nearby. The prime contractor needs to coordinate access, boundaries, services and hazard information. The excavation employer still has its own applicable duties. The owner may know of buried services and must communicate hazards it identifies under section 9. Assigning the prime contractor is the start of coordination, not an excuse for information to stop flowing from the others.

The Alberta OHS guide already on Complys explains the broader provincial duty framework. This page deliberately focuses on the designation and multi-employer handover. A reader deciding whether the company needs an OHS program, committee or worker training should use the broader guide and current Alberta rules rather than treating prime-contractor status as the answer to every obligation.

What evidence should a project keep?

Keep a dated trigger assessment, the employer list and work-site boundary, the written prime-contractor designation or voluntary agreement, acceptance and change history, a photograph or inspection record of the conspicuous posting, and the written section 10(7)(b) contact designation. Record the shared site system: hazard exchange, induction, activity coordination, emergency plan, inspections, issue escalation, corrective actions and work changes. Keep evidence proportionate to the site. A two-employer service job does not need a decorative binder of generic policy; a complex multi-trade project needs a plan detailed enough to manage its interfaces.

Good evidence tells the sequence. It shows which contractor reported a hazard, who was affected, what control was selected, when workers were told and whether the control held. A list of documents labelled complete is weak if a known live hazard remained unresolved. Use a version history when the prime contractor, work area or major method changes. The site team should be able to identify the current owner quickly without searching old procurement correspondence.

Consider access and privacy. Contractors may need to see shared hazard and emergency information, but not every commercial contract or personal record. The statutory posting must be visible, while detailed documents can have controlled access. Test the process on a supervisor's phone or site device before work begins; a record that only head office can open may not help the site manage a fast-moving interface.

Common designation mistakes

• Assuming the general contractor is automatically the statutory prime contractor. Check who controls the work site and complete the written designation required by section 10.
• Counting only employers present at the exact same minute. Assess employers involved in the construction or oil-and-gas work site under the current Alberta rule.
• Using a verbal appointment. The person in control must designate in writing when section 10(2) applies.
• Failing to post the name. A signed agreement kept in the office does not replace section 10(6)'s conspicuous site posting.
• Stopping after appointment. The prime contractor needs a functioning coordination system and the separate written cooperation-role designation.
• Treating a generic induction as hazard exchange. A changed lift, excavation or service isolation must reach the workers and employers affected.
• Telling subcontractors they have no remaining OHS duties. Employer and other obligation-holder duties continue alongside prime-contractor coordination.

Where Complys fits

The verified Complys Canada site describes contractor, document, hazard-assessment and training records. The Canadian contractor-management page is the relevant money-page destination for a buyer organising multiple employers. Those records may help a site team maintain contacts, current contractor evidence and actions, subject to what the deployed configuration actually supports. Complys does not make the statutory designation, decide who controls a contested site, replace the posted name or certify that the coordination process satisfies Alberta law. Demonstrate the current product against the site's required record and access workflow before relying on a particular feature.

Before mobilisation, identify every employer involved, apply the current Alberta OHS Act section 10, get the written designation right, post the name and test the coordination plan with an incoming subcontractor. If the work-site boundary or person in control is disputed, resolve those facts before calling the appointment complete. Then use a record system that makes shared hazards and decisions available to the people actually managing the work.

For the related Complys product, see Contractor Management Software. This guide is general information, not legal advice; verify current requirements against the official sources linked above.