Construction labor relations in the US

A building is put up by people, and on most construction sites those people work for many different employers, belong to different trades, and may or may not be represented by a union. The rules that govern how those workers are hired, paid, organized, disciplined and treated are as much a part of construction management as the schedule or the budget. A superintendent who does not know them will make mistakes that cost money, delay work and damage relationships with crews. This course covers those rules and the practical workforce management built on top of them, following one general contractor through one project.

Calder Ridge and the Elmwood tower

Calder Ridge Builders is a mid-sized general contractor based in Columbus, Ohio. It self-performs concrete, carpentry and general labor and subcontracts the other trades. Its field workforce of carpenters and laborers works under collective bargaining agreements that Calder Ridge signed with the carpenters' and laborers' unions through its contractor association. A sister company, Calder Homes, builds townhouses with a non-union crew. Through this course we follow Calder Ridge as it builds the Elmwood Health Center tower, a seven-story, $260 million patient tower for a regional hospital system, with about 220 of its own field workers at peak and more than 600 workers on site when the subcontractors are counted.

The people who appear in the lessons are Nadia Okafor, Calder Ridge's vice-president of operations; Grace Thibodeau, who manages human resources and labor relations; Luis Ferreira, the general superintendent on Elmwood; Ben Morrison, the project manager; Marco Silva, a labor foreman; Tom Kowalski, a carpenter who is also the union steward on site; and Aisha Rahman, a second-year apprentice carpenter. Their problems are invented, but each one is typical of what happens on real projects.

Why construction is different

Labor relations law was mostly designed with factories and offices in mind: one employer, one fixed workplace, a stable group of employees who can vote on whether to join a union and then bargain with their employer for years. Construction breaks almost every one of those assumptions, and both Canadian and American law contain special rules for it.

These features explain much of what follows: hiring halls that supply workers project by project, multi-employer pension and health plans that follow workers from job to job, collective agreements covering a whole trade in a region, rules for dividing work between crafts, and special rules about how a union can come to represent workers who are not yet hired.

Who makes the rules in the US

In the United States, private-sector labor relations are governed mainly by federal law: the National Labor Relations Act (NLRA) of 1935, as amended by the Taft-Hartley Act of 1947 and the Landrum-Griffin Act of 1959. The National Labor Relations Board (NLRB) runs representation elections and decides unfair labor practice cases, and its General Counsel prosecutes them. Because the NLRA largely preempts state law on organizing and bargaining, the basic rules are the same in Ohio as in Texas, but states still matter: they decide whether union security clauses are allowed, set prevailing wage rules for state-funded work, and pass their own employment laws.

Congress recognized the special nature of construction in 1959. Section 8(f) of the NLRA lets a construction employer sign a collective agreement with a union before any workers are hired and without proof that a majority supports the union, which ordinary employers may not do. The construction proviso to Section 8(e) lets construction unions and employers agree that work at the site will be subcontracted only to signatory contractors. Other provisions deal with picketing on sites shared by union and non-union employers and with disputes between unions over which trade does a task. Lesson 3 and lesson 5 cover these rules in detail.

The NLRB itself has had an unsettled few years. After the President removed a Board member in January 2025, the Board lacked the three-member quorum it needs to decide cases for most of a year, and a large backlog built up. The quorum returned on January 7, 2026, when two new members confirmed by the Senate in December 2025 were sworn in, and a new General Counsel took office the same day. Board doctrine tends to shift when its majority changes, so supervisors should expect some rules discussed in this course to be revisited.

The other laws that apply to every worker

Labor relations law governs unions, bargaining and the relationship between the parties. A second set of laws applies to every worker whether or not a union is present. Supervisors deal with all of them daily.

A collective agreement can give workers more than these statutes require but not less. Some rights, such as the right to be free from discrimination under Title VII, belong to the individual and can be enforced even if the union declines to pursue a grievance.

Union and non-union work side by side

In 2025, according to the Bureau of Labor Statistics, 11.1 percent of construction wage and salary workers were union members, compared with 10.0 percent of all workers and 5.9 percent across the private sector. Coverage varies enormously by region and sector: it is high in commercial and industrial construction in cities such as Chicago and New York and across much of the Midwest, and low in residential construction and across much of the South. Twenty-six states have right-to-work laws that forbid agreements requiring workers to pay a union as a condition of employment; Ohio is not one of them. Lesson 2 compares the union and merit shop models.

On Elmwood, the owner did not require union labor. Calder Ridge's own crews are unionized, the electrical and mechanical subcontractors are union shops, and the drywall, painting and landscaping subcontractors are not. Running that mixed site well means knowing what each employer's agreements require and keeping disputes from spreading between them.

A first look at the Elmwood workforce

Grace Thibodeau starts every project by mapping who will be on site, which agreements cover them and who represents them. The table below is a simplified version of her map for Elmwood's busiest month.

# Elmwood tower: workers on site in the peak month, by employer and representation (illustrative)
site = [
    # (employer, trade, workers, represented by)
    ("Calder Ridge", "carpenters", 120, "carpenters' union (8(f) agreement)"),
    ("Calder Ridge", "laborers", 100, "laborers' union (8(f) agreement)"),
    ("Brightline Electric", "electricians", 95, "electrical workers' union"),
    ("Keystone Mechanical", "plumbers and pipefitters", 110, "plumbers' and pipefitters' union"),
    ("Apex Sheet Metal", "sheet metal workers", 45, "sheet metal workers' union"),
    ("Norfield Drywall", "drywall and framing", 80, "none (merit shop)"),
    ("Colorline Painting", "painters", 30, "none (merit shop)"),
    ("Steelcraft Erectors", "ironworkers", 25, "ironworkers' union"),
]
total = sum(w for _, _, w, _ in site)
union = sum(w for _, _, w, rep in site if not rep.startswith("none"))
employers = {e for e, _, _, _ in site}
print(f"workers on site: {total}, employers: {len(employers)}")
print(f"represented by a union: {union} ({union / total:.0%}); merit shop: {total - union} ({(total - union) / total:.0%})")
for e, trade, w, rep in sorted(site, key=lambda r: -r[2]):
    print(f"  {e:20s} {trade:26s} {w:4d}  {rep}")

workers on site: 605, employers: 7
represented by a union: 495 (82%); merit shop: 110 (18%)
  Calder Ridge         carpenters                  120  carpenters' union (8(f) agreement)
  Keystone Mechanical  plumbers and pipefitters    110  plumbers' and pipefitters' union
  Calder Ridge         laborers                    100  laborers' union (8(f) agreement)
  Brightline Electric  electricians                 95  electrical workers' union
  Norfield Drywall     drywall and framing          80  none (merit shop)
  Apex Sheet Metal     sheet metal workers          45  sheet metal workers' union
  Colorline Painting   painters                     30  none (merit shop)
  Steelcraft Erectors  ironworkers                  25  ironworkers' union

Seven of the eight employers on Grace's list have their own agreements, rates, stewards and procedures, and two do not. Calder Ridge directly employs just over a third of the workforce, but as the general contractor it coordinates everyone. A dispute between the drywall contractor and the carpenters about who frames the bulkheads, or a picket line set up against the painting subcontractor, can stop work for every trade on site.

Three relationships on every site

It helps to think of labor relations on a project as three overlapping relationships. The first is between each employer and its own workers, governed by employment law and, where there is a union, by the collective agreement. The second is between employers and unions, which bargain the agreements, administer them through stewards and business representatives, and settle disputes through grievances and arbitration. The third is between the employers on the site, linked by subcontracts that pass down obligations such as schedules, safety rules and sometimes labor requirements set by the owner. A good superintendent keeps all three in view. When Luis Ferreira plans a weekend pour, he thinks about his own crew's overtime rules, the steward's likely questions, and whether the pump operator's union and the rebar subcontractor's crew are covered for the same hours.

What a supervisor needs to know

Superintendents and foremen are not labor lawyers, and Calder Ridge does not expect them to be. It does expect them to know enough to spot an issue early, avoid making it worse and call Grace. Her short list for new supervisors covers the areas where field decisions most often create labor relations problems.

• Which agreement covers each crew, and what it says about hours, overtime, breaks, travel, show-up pay and the number of apprentices per journeyworker.
• Who the stewards are, what rights they have, and why problems should be raised with them early rather than allowed to fester.
• Which trade claims which work, and why changing an assignment without checking can trigger a jurisdictional dispute.
• What supervisors must never do during a union organizing campaign, such as threatening, interrogating, promising benefits or spying.
• How to document performance and conduct problems so that discipline can be defended if it is grieved.
• How to respond to harassment, discrimination or a safety complaint, which are legal duties as well as good management.

Lessons 2 to 6 build the labor relations foundation: union models, how representation and bargaining work, collective agreements, jurisdiction, and project agreements. Lessons 7 to 11 turn to workforce management: hiring, apprenticeship, workforce planning and productivity, respect and harassment prevention, and discipline and grievances. Lesson 12 brings everything together in a workforce and labor relations plan for Calder Ridge's next project.