A bargaining unit is the specific group of employees a union represents when it negotiates wages, hours, and working conditions with an employer. The National Labor Relations Board decides whether a proposed group qualifies, and that decision shapes who votes in a representation election and who the resulting contract covers. Once the NLRB certifies a union as the representative of a unit, that union speaks for every employee in the group, whether or not each person individually supports it.1National Labor Relations Board. National Labor Relations Act
Under the National Labor Relations Act, a unit must contain at least two employees who share enough workplace interests to bargain together.2National Labor Relations Board. Basic Guide to the National Labor Relations Act Exclusivity is the point. Once a unit has a certified representative, the employer has to negotiate in good faith with that union over pay, benefits, scheduling, and other terms of employment; refusing to bargain is an unfair labor practice.3Office of the Law Revision Counsel. 29 US Code 158 – Unfair Labor Practices The contract that comes out of those negotiations covers everyone in the unit, not just dues-paying members.
How the NLRB Decides Who Belongs Together
The Board applies a “community of interest” test.4National Labor Relations Board. Board Modifies Framework for Appropriate Bargaining Unit Standard Workers who face similar conditions should be able to bargain together; workers whose jobs look nothing alike generally shouldn’t be forced into the same group. In practice, several overlapping factors drive the analysis.
Similarity in pay structure carries real weight. If everyone in the proposed group is paid hourly on the same scale and receives the same benefits, that supports keeping them together. Common supervision matters for the same reason: employees who report to the same managers tend to face the same policies day to day. Shared work locations and regular contact between employees point toward a genuine community of interest, and so does interchange between roles, where workers rotate through different jobs or departments.2National Labor Relations Board. Basic Guide to the National Labor Relations Act
The statute lets the Board approve several unit configurations: an employer-wide unit, a single-craft unit, a plant-level unit, or a subdivision of any of those.5National Archives. National Labor Relations Act (1935) No configuration is automatically correct. Facts drive each case.
Professional Employees
When a proposed unit mixes professional and non-professional employees, the professionals get their own vote on whether to be included. The Board cannot approve the combined unit unless a majority of the professionals agree to it.1National Labor Relations Board. National Labor Relations Act Professionals tend to have distinct credentials, pay structures, and working conditions that a broader unit could wash out.
Security Guards
Guards face a separate rule. The NLRA prohibits placing guards in the same unit as other employees, and a union representing guards cannot be affiliated with any organization that also represents non-guard workers.6Office of the Law Revision Counsel. 29 US Code 159 – Representatives and Elections Guards may be called on to enforce rules against the very coworkers a mixed union would also represent, and Congress built a wall between the two.
Who Cannot Be in a Bargaining Unit
Several categories of workers are not “employees” under the Act at all and cannot belong to any unit. The statute excludes agricultural laborers, domestic workers, anyone employed by a parent or spouse, independent contractors, supervisors, and workers covered by the Railway Labor Act.7Office of the Law Revision Counsel. 29 US Code 152 – Definitions
The supervisor exclusion causes the most confusion. Someone counts as a supervisor only if they use independent judgment to hire, fire, promote, discipline, or meaningfully direct other employees’ work. A lead worker who hands out task assignments as routine, without real discretion, usually doesn’t meet the threshold. The line between genuine supervisory authority and routine coordination matters a great deal when a unit is being drawn.
Managerial employees are also excluded, though that rule comes from Board and Supreme Court decisions rather than the statute’s text. The reasoning: employees who help shape company policy have interests too closely tied to the employer to sit in a unit with the workers those policies affect. Confidential employees who assist managers with labor relations strategy are excluded on similar logic.8National Labor Relations Board. Are You Covered?
How a Unit Gets Recognized
The formal path runs through NLRB Form 502, the petition for certification of a representative.9National Labor Relations Board. Steps for Filing a Petition Before filing, the petitioning union needs a showing of interest from at least 30 percent of the employees in the proposed unit, usually signed authorization cards or a signed petition.2National Labor Relations Board. Basic Guide to the National Labor Relations Act The showing of interest is confidential and goes only to the NLRB regional office, never to the employer.
The petition itself requires the employer’s exact legal name, a clear description of the proposed unit (which job titles are in, which are out), and the approximate number of employees in it. Precision matters. A vague unit description invites employer challenges and can push the timeline back by weeks.10National Labor Relations Board. Form NLRB-502 (RC) – RC Petition
Once the regional office receives the petition, NLRB staff investigates whether the showing of interest is adequate and whether the proposed unit looks appropriate. If the employer agrees on the unit and election details, the parties can enter an election agreement and move to a vote. If the employer disputes the boundaries, the regional director schedules a pre-election hearing focused on whether there’s enough evidence to hold an election at all. Disputes about whether a specific individual employee belongs in the unit are typically deferred until after the election, so a single contested classification doesn’t hold up the vote.11National Labor Relations Board. Representation Case Procedures
Employees then vote by secret ballot, usually at the workplace. The union wins if it receives a majority of the valid ballots cast, not a majority of everyone in the unit. If 100 employees are eligible but only 60 vote, the union needs 31 votes to win. After a successful election, the Board certifies the union as the exclusive representative of the unit and a one-year window opens during which no rival or decertification petition can be filed.2National Labor Relations Board. Basic Guide to the National Labor Relations Act
An NLRB election isn’t the only path. An employer can voluntarily recognize a union that demonstrates majority support through signed authorization cards from more than half the employees in an appropriate unit, and the Board’s current rules bar new election petitions for a reasonable period after voluntary recognition takes effect.12National Labor Relations Board. NLRB Issues Fair Choice-Employee Voice Final Rule Employers aren’t required to grant it; if they decline, the union’s path runs through the standard petition and election.
Timing Bars on Petitions
Once a unit exists, several timing rules keep it stable. These bars matter whether the goal is to organize a new unit, switch unions, or decertify an existing one.
- Certification year bar: For the first year after certification, no new representation or decertification petition can be filed for that unit.2National Labor Relations Board. Basic Guide to the National Labor Relations Act
- Contract bar: Once a collective bargaining agreement is in place, the Board will not process any new representation or decertification petition during the first three years of that agreement.13National Labor Relations Board. National Labor Relations Board Retains Longstanding Contract-Bar Doctrine
- Window period: The one opening in the contract bar runs from 90 days before the contract expires to 60 days before expiration. For healthcare employers, it runs from 120 to 90 days before expiration.14National Labor Relations Board. Decertification Election
After a contract passes the three-year mark or expires entirely, new petitions can be filed at any time.14National Labor Relations Board. Decertification Election Missing the window period by a day means waiting until the contract expires or a successor takes its place, so anyone tracking a unit’s status needs those dates on the calendar.