Union vs. Open Shop (Merit Shop)
Two different labor models in construction. A union shop staffs its workforce through union hiring halls under a collective bargaining agreement that sets wages, benefits, and work rules; an open shop (also called a merit shop) hires workers directly without union affiliation, setting its own wages and benefits independently. Many markets and even individual companies operate under a mix of both depending on the trade and the project.
Why it matters
The choice (or the market a contractor operates in) affects labor cost structure, workforce availability, and even which projects a contractor can bid competitively on: some large public or unionized markets effectively require union labor to be competitive, while other regions and trades are predominantly open shop, and a company built around one model can struggle to compete in a market dominated by the other.
On a real project
A general contractor bidding work in a heavily unionized metropolitan market staffs the project through union hiring halls under a project labor agreement, while the same company's projects in a different, predominantly open-shop region hire workers directly without any union affiliation.
Who this matters most to
A HR Manager manages fundamentally different labor relations depending on which model a project operates under: union grievance procedures and hiring hall dispatch rules on one side, direct hiring and retention strategy on the other. A Superintendent running a union project has to work within collectively bargained work rules (jurisdiction between trades, break requirements) that don't apply the same way on an open shop job.
Where this goes wrong
A company accustomed to open shop hiring practices takes on a project in a market that's effectively all-union and staffs it the way they normally would, without accounting for union jurisdiction rules over which trade performs which task. Disputes over work assignments between trades slow the project down and create friction the company didn't anticipate, since their usual open shop practices don't map onto a union jobsite's rules.