Pros and Cons of Union vs Non-Union Construction Projects

Key Takeaways

• Union construction workers are represented by trade unions such as the International Brotherhood of Electrical Workers (IBEW) or the United Brotherhood of Carpenters (UBC), which negotiate collective bargaining agreements covering wages, benefits, training, and dispute resolution. Non-union (open shop) labor is negotiated individually between the contractor and worker.
• As of 2025, 11.1% of the U.S. construction workforce is unionized, up from 10.3% in 2024, according to BLS data analyzed by Associated Builders and Contractors (ABC).
• Union construction workers had median weekly earnings of $1,585 in 2025 compared to $1,132 for non-union construction workers, according to the Bureau of Labor Statistics. That gap narrows or widens depending on trade, region, and local labor market conditions.
• Academic research using OSHA inspection data has found fewer safety violations on union job sites, though industry associations representing non-union contractors dispute how much of that gap reflects union status versus other factors, such as company size and safety investment.
• Federal construction projects worth $35 million or more remain subject to Project Labor Agreement requirements under Executive Order 14063, which the current administration confirmed it would continue enforcing in a June 2025 policy memo.
• Davis-Bacon prevailing wage requirements can apply to covered public projects regardless of whether your workforce is union or non-union, so choosing non-union labor doesn’t eliminate compliance obligations on government-funded work.
• There’s no universally correct choice. Large, complex, or publicly funded projects often favor union labor for workforce stability and compliance support, while smaller or fast-moving private projects often favor non-union labor for flexibility and cost control.
• A growing number of contractors run hybrid workforces, using union labor on some projects or trades and non-union labor on others, which adds payroll and reporting complexity that most general-purpose payroll systems aren’t built to handle.

In February 2025, the Department of Defense told contracting officers to stop requiring project labor agreements on large federal jobs. By June, the White House reversed course and told agencies to keep using them. For contractors bidding on federal work, that whiplash landed in the middle of a labor shortage, rising material costs, and tighter margins, and it’s a clear reminder that the union versus non-union decision isn’t just a philosophical one. It has real consequences for who you can hire, what you’re required to pay, and how exposed you are to compliance risk.

This decision touches nearly every corner of a construction business: bidding strategy, payroll setup, workforce planning, and risk management. Business owners, project executives, payroll managers, and compliance teams all need a clear-eyed view of what union and non-union labor actually cost, how they perform, and when each model makes sense.

This article breaks down the real differences between union and non-union construction, walks through the current data on wages, benefits, and safety outcomes, and explains the regulatory factors, including Project Labor Agreements and prevailing wage rules, that affect the decision regardless of which model you prefer.

What Union and Non-Union Construction Actually Mean

What Is Union Labor?

Union labor refers to construction workers who belong to a trade union, such as the IBEW for electricians or UBC for carpenters. These unions negotiate collective bargaining agreements (CBAs) with employers or employer associations. A CBA is a legally binding contract that sets wage scales, benefit contributions, work rules, and grievance procedures for everyone the union represents on a job.

In practice, this means that a union electrician on a job site in Chicago and one in Denver, working for different contractors under the same local’s agreement, are paid according to the same negotiated wage scale for their classification and experience level, plus contributions to health and pension funds administered by the union.

What Is Non-Union (Open Shop) Labor?

Non-union labor, often called open shop labor, refers to any arrangement in which workers are not covered by a collective bargaining agreement. Wages, benefits, and working conditions are set individually between the contractor and each employee or in accordance with the contractor’s internal pay scales and policies.

Non-union labor makes up the large majority of the U.S. construction workforce. This gives contractors more flexibility in structuring compensation and staffing, but it also means benefits and wage consistency vary significantly from one employer to the next.

How the Two Models Differ in Practice

How Many Construction Workers Are Actually Unionized

Despite the attention the union versus non-union debate receives, union representation in construction is a minority position nationally. According to BLS data analyzed by ABC, 11.1% of U.S. construction workers were union members in 2025, up from 10.3% in 2024. That means roughly 995,000 construction workers were union members in 2025 out of a workforce of about nine million.

Union density varies widely by region and trade. Some metro areas and specialty trades, particularly in the Northeast, Midwest, and West Coast, have union representation well above the national average, while much of the South and many residential builders operate almost entirely open shop. If you’re evaluating labor strategy, your local market matters more than the national number.

The Case for Union Construction

Structured Training and Apprenticeship Pipelines

Union apprenticeship programs are jointly funded and run by unions and signatory contractors, typically lasting three to five years and combining paid on-the-job training with classroom instruction. This produces a workforce with a consistent, verifiable skill level across a given trade classification, which can reduce rework and quality issues on complex work.

Predictable Labor Costs for Budgeting

Because wage scales are set by a CBA rather than negotiated project by project, union labor costs are easier to predict during estimating. You know the wage and benefit rate for a given trade and classification before you bid, which reduces the risk of wage-driven cost overruns mid-project.

Formal Benefits and Job Protections

Union workers have significantly higher access to employer-provided benefits than non-union workers. According to BLS data, workers represented by unions had 95% access to both retirement and medical benefits in March 2024, compared to 72% and 71%, respectively, for non-union workers. Access to any form of paid leave was 97% for union-represented workers versus 87% for non-union workers.

Union CBAs also typically include formal grievance procedures, which give workers a structured path to resolve disputes over discipline, safety, or pay without going straight to litigation.

Safety Outcomes, With an Important Caveat

A 2021 study by the Illinois Economic Policy Institute and the Project for Middle Class Renewal at the University of Illinois Urbana-Champaign analyzed more than 37,000 OSHA inspections and found that union construction job sites were 19% less likely to have a safety violation and had 34% fewer violations per inspection than non-union sites.

Separately, a 2018 survey by the Center for Construction Research and Training (CPWR) found that construction firms employing union workers were more likely to require OSHA 30-hour training for supervisors (71.7% versus 54.5% for non-union firms) and more likely to conduct hazard analysis before starting work.

It’s worth noting these studies were produced by labor-affiliated research organizations, and groups representing open shop contractors, such as ABC, argue that safety performance depends more on individual company practices, training investment, and OSHA certification than on union status itself. Both things can be true: aggregate data suggests better safety outcomes on union sites, but plenty of non-union contractors run excellent safety programs, and union status alone is not a safety guarantee.

The Case Against Union Construction

Higher Labor Costs

Union wage and benefit rates are, on average, meaningfully higher than non-union rates. BLS data show union construction workers earned a median of $1,585 per week in 2025 compared to $1,132 for non-union workers, a gap of roughly 40%. For labor-intensive projects, this can materially affect your bid competitiveness, particularly on private work where cost is the deciding factor.

Less Staffing Flexibility

CBAs often include specific work rules around task assignment, overtime, and crew composition. Contractors have less discretion to reassign workers across trades, adjust schedules on short notice, or bring in additional labor outside the hiring hall process. On fast-moving projects where scope changes frequently, this can slow decision-making.

Administrative and Reporting Complexity

Union projects typically require detailed fringe benefit tracking, remittance reporting to multiple union trust funds, and compliance with the specific terms of each local’s CBA. If you work across multiple union locals or multiple trades, this reporting burden multiplies, and errors can trigger audits or penalties from the trust funds.

Risk of Work Stoppages

Union projects carry some risk of labor action if contract negotiations break down, though most CBAs include no-strike clauses for the life of the agreement. Contractors should understand the specific terms of any CBA to which they’re signatories rather than assuming automatic protection from disruption.

The Case for Non-Union Construction

Lower Labor Costs on Average

Because wages and benefits are negotiated individually, non-union contractors generally have lower average labor costs, which can be a meaningful advantage on price-sensitive private work.

Greater Staffing Flexibility

Non-union contractors have more freedom to hire, reassign, and schedule workers based on project needs without navigating hiring hall procedures or CBA work rules. This can be a real advantage on projects with tight timelines or frequently shifting scope.

Faster, More Direct Decision-Making

Without collective bargaining constraints, project managers can typically make staffing and scheduling decisions more quickly, since they aren’t coordinating them against a negotiated agreement.

The Case Against Non-Union Construction

Inconsistent Skill Levels and Training

Without a standardized apprenticeship structure, training quality varies widely by employer. Some open-shop contractors invest heavily in their own training programs; others provide minimal formal training, which can result in inconsistent quality or more rework on complex scopes.

Less Predictable Long-Term Costs

Lower upfront labor costs can be offset by higher turnover, more time spent recruiting and retraining, and wage pressure in tight labor markets. In the current environment, where non-union wages have been rising faster than union wages as open shop firms compete for the same limited labor pool, that cost gap has already been narrowing.

Weaker Benefits and Higher Turnover

Non-union workers have lower average access to retirement, medical, and paid leave benefits, which can affect retention, particularly in a labor market where skilled trades workers have options. Higher turnover translates directly into higher recruiting and onboarding costs.

Wages and Benefits: What the Data Actually Shows

Here’s a direct comparison using the most recent full-year BLS data available:

A note on the 2025 figures: BLS annual averages for 2025 are based on an 11-month period that excludes October, since data collection was disrupted by the federal government shutdown that year. The bureau notes that 2025 annual estimates aren’t strictly comparable to prior years for this reason.

Always check the current BLS release before citing these figures in a proposal or compliance document, since the numbers update annually and methodology notes can affect year-over-year comparisons.

Project Labor Agreements and the 2026 Regulatory Landscape

If you bid on federal construction work, the union versus non-union decision intersects with a specific regulatory requirement: Project Labor Agreements (PLAs).

Executive Order 14063, signed in February 2022, requires federal agencies to require PLAs on large-scale federal construction projects, defined as those with an estimated contract value of $35 million or more, unless a narrow exception applies. A PLA is a pre-hire agreement that establishes wages, benefits, and dispute resolution procedures for all workers, union or non-union, for the duration of a specific project.

This requirement went through a turbulent stretch in 2025. In February, the Department of Defense directed contracting officers to stop requiring PLAs on large projects. Legal challenges followed, including a May 2025 preliminary injunction from a federal judge that forced the Defense Department to resume the mandate.

In June 2025, the White House Office of Management and Budget issued Memorandum M-25-29, clarifying that the administration supports continued use of PLAs “when practicable and cost effective” and that agencies should not issue blanket exceptions. As of this writing, EO 14063 remains in effect.

For contractors, the practical takeaway is that PLA requirements on large federal projects have not gone away, despite public signals earlier in 2025 suggesting they might. If you’re bidding federal work above the $35 million threshold, confirm the current PLA requirement for that specific solicitation rather than assuming policy direction from news headlines. This is an area that continues to shift, so verify current requirements directly through the contracting agency or the Federal Acquisition Regulation before bidding.

Davis-Bacon and Prevailing Wage: A Separate Compliance Layer

It’s worth separating two things that often get conflated: union status and prevailing wage requirements.

The Davis-Bacon Act requires contractors and subcontractors on federal and federally assisted construction contracts over $2,000 to pay laborers and mechanics no less than the locally prevailing wage and fringe benefit rates, as determined by the U.S. Department of Labor, for the type of work performed. Many states have their own “little Davis-Bacon” laws that apply similar requirements to state-funded projects, and requirements vary significantly by state, so contractors should confirm the specific rules that apply in each jurisdiction where they work.

Prevailing wage requirements apply based on the funding source and project type, not on whether your workforce is unionized. A fully non-union contractor working on a Davis-Bacon-covered project must still pay the prevailing wage rate for each labor classification and file certified payroll reports documenting compliance. In some markets, the prevailing wage rate is effectively the local union wage scale, which means non-union contractors on covered projects may end up paying close to union rates anyway, without the union benefit structure or training pipeline that comes with it.

This is a common point of confusion for contractors moving into public work for the first time, and it’s worth building into your bidding and payroll process regardless of which labor model you generally use.

When to Choose Union vs. Non-Union Labor

The right choice depends on project scale, funding source, local labor market conditions, and how much you value staffing flexibility versus workforce predictability.

Union labor tends to make more sense when:

• The project is large, complex, or technically demanding and requires a consistently trained, credentialed workforce.
• The project is subject to a PLA requirement or is otherwise likely to draw union labor regardless of your preference.
• Labor supply in your market is tight, and union hiring halls give you more reliable access to skilled trades.
• Predictable, standardized labor costs are more important to your bid strategy than flexibility.
• Formal safety programs, structured grievance procedures, and reduced compliance risk are priorities.

Non-union labor tends to make more sense when:

• The project is smaller, faster-moving, or has frequently shifting scope.
• You have established relationships with reliable non-union subcontractors or a strong in-house workforce.
• Local market access to non-union skilled labor is strong.
• Maximum flexibility in staffing, scheduling, and task assignment is a priority.
• The project isn’t subject to prevailing wage or PLA requirements that would narrow the cost gap anyway.

Hybrid Labor Models Are Becoming More Common

A growing number of contractors don’t pick one model exclusively. Many general contractors run union crews on public or PLA-covered projects while using non-union labor on private work, or maintain a mixed workforce where certain trades are unionized and others aren’t. This approach can capture the cost flexibility of open shop labor while still accessing union hiring halls for specialized trades or peak-demand periods.

The tradeoff is payroll and compliance complexity. Running union and non-union payroll side by side means tracking different wage scales, fringe benefit structures, remittance schedules, and certified payroll requirements simultaneously, often across multiple states and multiple union locals.

This is one of the most common operational pain points we hear from contractors scaling past a single labor model, and it’s a major reason purpose-built construction payroll systems exist rather than rely on generic payroll software built for other industries.

Frequently Asked Questions

What are the main differences between union and non-union construction jobs?

Union construction jobs are covered by a collective bargaining agreement that sets standardized wages, benefits, and working conditions for everyone in a given trade classification. Workers are typically hired through a union hiring hall based on seniority and skill classification, and disputes are handled through a formal grievance process. Non-union construction jobs are negotiated individually between the contractor and each worker, which means wages and benefits vary by employer. Non-union employment is also typically at-will, giving both the worker and the contractor more flexibility, but less formal protection, than a union arrangement provides.

Do union construction jobs pay more than non-union jobs?

On average, yes. BLS data shows union construction workers had median weekly earnings of $1,585 in 2025 compared to $1,132 for non-union workers, a gap of roughly 40%. That said, this is a national average and the actual gap varies significantly by trade, region, and local labor market. In some tight labor markets, non-union wages for in-demand trades like electricians have risen enough to narrow the gap. Always check trade-specific and regional wage data rather than relying on the national figure alone when estimating labor costs for a specific project.

What should contractors know about hiring a union contractor?

Hiring a union contractor generally means access to workers who completed a structured, multi-year apprenticeship program with standardized skill benchmarks for their trade. It also typically means predictable labor costs based on a published wage scale, formal safety and training requirements, and a workforce covered by employer-funded health and pension benefits. The tradeoff is less flexibility in staffing and scheduling, since work assignments and overtime are often governed by the terms of the collective bargaining agreement rather than the contractor’s discretion alone.

Does union status affect prevailing wage or Davis-Bacon compliance?

Not directly. Prevailing wage requirements under the Davis-Bacon Act and similar state laws apply based on the funding source and type of project, not on whether your workforce is unionized. A non-union contractor working on a Davis-Bacon covered federal project must still pay the determined prevailing wage rate for each labor classification and submit certified payroll reports, regardless of union status. In some markets, the prevailing wage rate closely tracks the local union scale, so non-union contractors on covered projects may end up paying close to union rates without the union training pipeline or benefit structure.

Final Thoughts

Union and non-union construction each come with real, well-documented tradeoffs. Union labor tends to offer more predictable costs, structured training, stronger benefits, and better documented safety outcomes, but at a real wage premium and with less staffing flexibility. Non-union labor offers more flexibility and generally lower upfront costs, but with more variability in skill level, benefits, and long-term cost predictability.

Neither model is automatically the right answer. The decision should be driven by project scale, funding source, local labor market conditions, and how much regulatory exposure you’re carrying on a given job, particularly if PLA requirements or prevailing wage rules apply. For many contractors, the real answer is running both models well, which means having payroll and compliance systems that can handle union remittances, certified payroll, and standard payroll side by side without manual workarounds.

Lumber’s payroll platform supports both union and non-union construction payroll, including certified payroll reporting, union fringe benefit tracking, and multi-local remittance management, so contractors can run whichever labor model fits a given project without adding administrative overhead. Book a demo to see how it works for your workforce mix.