Trade jurisdiction and work assignment disputes

On a union construction site, every task belongs to some trade. Carpenters build formwork, ironworkers place reinforcing steel and erect structural steel, labourers strip forms and place concrete, electricians pull wire, and so on. The boundaries between trades are mostly clear, but there are thousands of tasks on a hospital tower and some fall on the line: who installs the steel door frames, who builds the scaffolds, who sets the anchor bolts, who installs the firestopping around pipes passing through a rated wall. When two unions both claim a task, the result is a jurisdictional dispute, and handled badly it can stop a site. This lesson explains why these disputes happen, how they are prevented, and how they are resolved.

Why trade jurisdiction matters to workers

To a contractor, a jurisdictional dispute can look like a quarrel about who gets paid for a few hours of work. To the workers involved, it is about their livelihood. A union's claim to a type of work defines what its members are trained to do, what its apprenticeship teaches, and how many jobs its members will have over decades. If one trade loses a category of work, such as installing a new kind of wall panel or a new type of fire protection, its members lose that work on every future project. That is why unions defend their jurisdiction firmly, why they record agreements and decisions about it carefully, and why new materials and methods often spark disputes.

Jurisdiction also affects cost and productivity for contractors. Assigning work to the trade with the right skills and tools produces better work; assigning it to a trade whose rate is lower, or whose crew happens to be idle, may look efficient but can provoke a dispute that costs far more than it saves.

How work is assigned

In Ontario, the employer assigns the work. Calder Ridge's superintendent decides which of its crews, or which subcontractor, performs each task, guided by the collective agreements' scope clauses, agreements between unions about jurisdiction, past practice in the industry and the company's own practice. A union that disagrees can file a complaint with the OLRB, but the employer's assignment generally stands while the dispute is resolved, and the unions are bound by no-strike obligations.

The key moment for preventing disputes is before work starts. Experienced contractors hold a pre-job or mark-up conference: the contractor lists the major work items in its scope, states which trade it will assign each to, and gives the unions a chance to raise objections before anyone is on site. On Elmwood, Luis held separate mark-up meetings with the carpenters, labourers and ironworkers in the month before mobilization, covering about 140 items, and sent the minutes to each union and to Grace.

Sources of jurisdiction

When Luis assigns a disputed item, he looks at the same sources a labour board or arbitrator would look at later.

No single source settles every question. Scope clauses in different unions' agreements often overlap, because each union writes its agreements to claim as much as it can. Agreements between unions settle many common disputes, but they do not cover every task and they apply only where both unions are parties. That is why the order and weight of the factors matters.

Resolving disputes in Ontario

Under section 99 of Ontario's Labour Relations Act, 1995, the OLRB can decide a complaint that work has been assigned to the wrong trade. The board typically considers the collective agreements, any agreements between the unions, the employer's practice, area and industry practice, the skills and training of the workers, safety, and economy and efficiency. It encourages the parties to settle, holds consultations quickly because construction moves fast, and can make interim orders. Its decisions become important precedents: the parties and other contractors look to them in future assignments. Other provinces have comparable procedures in their labour statutes.

The board has also recognized that construction disputes are best prevented by the industry itself. Unions and contractors in several trades have national and provincial agreements dividing contentious work, and many collective agreements require the parties to meet promptly when a jurisdictional issue arises. Calder Ridge follows a simple sequence: discuss with both stewards and business representatives, try to reach an agreement on site, and only then involve the board.

Scoring a disputed assignment

When a task is genuinely contested, Grace helps Luis structure the decision. The scoring below is not a legal test, and the weights are Calder Ridge's own judgement, but writing down the reasons makes the assignment consistent and defensible, and makes it easier to explain to both unions.

# Structured review of three disputed Elmwood assignments (illustrative weights and scores, 0 to 3)
weights = {"agreements": 3, "union_agreement_or_decision": 3, "area_practice": 2,
           "employer_practice": 2, "skills_safety": 2, "efficiency": 1}
items = {
    "hollow metal frames in drywall walls": {
        "carpenters": dict(agreements=3, union_agreement_or_decision=3, area_practice=3, employer_practice=3, skills_safety=2, efficiency=3),
        "ironworkers": dict(agreements=2, union_agreement_or_decision=1, area_practice=1, employer_practice=0, skills_safety=2, efficiency=1)},
    "heavy embed plates for the crane tie-ins": {
        "carpenters": dict(agreements=1, union_agreement_or_decision=1, area_practice=1, employer_practice=2, skills_safety=1, efficiency=2),
        "ironworkers": dict(agreements=3, union_agreement_or_decision=2, area_practice=3, employer_practice=1, skills_safety=3, efficiency=2)},
    "firestopping at pipe penetrations": {
        "insulators": dict(agreements=2, union_agreement_or_decision=1, area_practice=2, employer_practice=1, skills_safety=2, efficiency=2),
        "plumbers": dict(agreements=2, union_agreement_or_decision=2, area_practice=2, employer_practice=2, skills_safety=2, efficiency=3)},
}
for item, trades in items.items():
    scores = {t: sum(weights[k] * v for k, v in f.items()) for t, f in trades.items()}
    best = max(scores, key=scores.get)
    margin = sorted(scores.values())[-1] - sorted(scores.values())[-2]
    note = "clear" if margin >= 8 else "close: meet both unions before assigning"
    print(f"{item:40s} " + ", ".join(f"{t} {s}" for t, s in scores.items()) + f"  -> {best} ({note})")

hollow metal frames in drywall walls     carpenters 37, ironworkers 16  -> carpenters (clear)
heavy embed plates for the crane tie-ins carpenters 16, ironworkers 31  -> ironworkers (clear)
firestopping at pipe penetrations        insulators 21, plumbers 27  -> plumbers (close: meet both unions before assigning)

The door frames and the embeds come out clearly, and the reasons match what an outside decision-maker would likely weigh. Firestopping is close, which is a signal to meet both unions and the mechanical subcontractor before deciding, and to record the outcome. On Elmwood the parties agreed that the plumbers would firestop their own penetrations and the insulators would firestop where their insulation passed through rated assemblies, which reflected the area practice and kept each trade responsible for its own work.

When a dispute flares up on site

Despite good preparation, disputes happen. In month 7 on Elmwood, a labourers' foreman told his crew to start erecting a system scaffold on the east elevation that the carpenters' steward believed was carpenters' work under a local practice. Within an hour, the carpenters on the next bay had stopped work to talk about it. Luis's response followed the steps Calder Ridge teaches every superintendent.

• Keep the work going and safe: work continued under the existing assignment, and the carpenters were reminded, calmly, that the agreement does not allow stoppages over jurisdiction.
• Get the facts: what the task was, how it had been assigned at the mark-up meeting, and what the minutes said.
• Involve the right people: both stewards, then both unions' business representatives, and Grace.
• Look at the sources: the agreements, any agreement between the unions on scaffolds, area practice, and Calder Ridge's own practice on earlier projects.
• Decide and record: Luis confirmed the assignment that had been made at mark-up, which matched the company's practice, and offered both unions a meeting to discuss future scaffold work.
• Follow up: the carpenters' union filed a complaint, which was later settled, and the settlement terms were added to Calder Ridge's assignment records for future projects.

The stoppage lasted less than an hour because Luis had the mark-up minutes in his truck and knew whom to call. Without them, the same dispute could have stopped the east elevation for days.

New materials and methods

Jurisdictional disputes cluster around change. Prefabricated wall panels, modular bathroom pods, mass timber, new firestopping products and building-integrated technology all blur traditional trade lines. On Elmwood, the prefabricated headwall units in the patient rooms combined electrical, medical gas and finishing work in a single factory-built assembly. Before ordering them, Ben and Grace met the electricians, plumbers and carpenters to agree who would receive, set, connect and finish them on site. The meeting took an afternoon; a dispute after installation began could have cost weeks.

A good rule for any new product or method is to raise the jurisdiction question at the design or procurement stage, when there is time to consult the unions and check precedents, rather than when the material arrives on site.

Non-union subcontractors and jurisdiction

Jurisdictional rules apply among unionized trades. A non-union subcontractor on the same site has no jurisdictional claims of its own and assigns its workers as it chooses, but its presence can still provoke a dispute if a union believes the work falls within its scope and should have gone to a signatory contractor. That question is about the subcontracting clause, covered in lesson 4, rather than about jurisdiction between trades, and it should be answered before the subcontract is awarded.

Keeping an assignment record

Calder Ridge keeps a company-wide assignment register: a simple table of every work item that has been the subject of a mark-up discussion, objection, settlement or decision, with the trade it was assigned to, the reasons, the date and the project. Before every mark-up meeting, Luis checks the register so that his assignments are consistent with the company's past practice, which is itself one of the factors that labour boards and arbitrators weigh. A contractor whose assignments change from project to project weakens its own position in every future dispute, because it can no longer point to a consistent practice.

The register also helps with estimating and scheduling. If firestopping is split between the plumbers and the insulators, the estimate must carry both crews, and the schedule must sequence the two trades through each rated wall. If the carpenters erect the scaffolds and the labourers dismantle them, both must be in the plan for the east elevation. Jurisdiction is not just a labour relations question; it shapes crew sizes, cost codes and the order of work.

• Record the item in plain language, with drawing or specification references.
• Record the trade assigned, the reasons, and the unions present when it was discussed.
• Attach any agreement between unions, settlement or decision that applied.
• Note any objection and how it was resolved, including settlements reached later.