Union Certification — Ontario Employment Law
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About Union Certification
Union certification is the formal legal process through which a trade union obtains the right to act as the exclusive bargaining agent for a specific group of employees in Ontario. Governed by the Ontario Labour Relations Act, 1995 (LRA), this process shifts a workplace from a direct employer-employee relationship into a collective bargaining framework. Because the right to unionize is heavily protected, the certification process is strictly managed by the Ontario Labour Relations Board (OLRB) to ensure fairness and adherence to statutory rules.
In most Ontario sectors, certification is a two-step process. First, a union must collect signed membership cards from at least 40% of the employees in the proposed bargaining unit. Once this threshold is met, the union can file a certification application with the OLRB. The Board will then typically order a secret ballot vote, usually held within five working days of the application. For the union to be successfully certified, it must secure more than 50% of the votes cast by the employees who actually vote—not necessarily a majority of the entire workforce.
Ontario maintains distinct rules for the construction industry, where a "card-check" system exists. If a construction union collects signed cards from more than 55% of the employees in the bargaining unit, the OLRB can certify the union automatically without requiring a secret ballot vote.
Disputes frequently arise during the certification process. Employers might argue over which employees belong in the bargaining unit (for instance, claiming certain individuals are managers and should be excluded). Alternatively, unfair labour practice complaints may emerge if an employer attempts to threaten or coerce workers during a union drive. If the OLRB determines that an employer breached the LRA so severely that a fair vote cannot be held, it may grant "remedial certification," certifying the union regardless of a vote outcome.
The OLRB enforces incredibly tight timelines and strict procedural rules during certification hearings. Late filings or failure to appear can result in the Board refusing to hear oral evidence or rejecting objections entirely. Because navigating OLRB procedures, jurisdictional issues, and the Labour Relations Act is highly complex and time-sensitive, securing guidance from a legal professional who focuses on labour law is highly recommended for any party involved in a certification drive.
Frequently Asked Questions
How many employees have to sign a union card to get a vote in Ontario?
Under the Ontario Labour Relations Act, a union needs signed membership cards from at least 40% of the employees in a proposed bargaining unit to trigger a secret ballot certification vote.
What percentage of the vote is required for the union to be certified?
The union must win 50% plus one of the votes that are actually cast. It is not based on the total number of employees in the workplace, but rather the majority of those who show up to vote.
Can an employer automatically be unionized without a vote?
Yes, in certain circumstances. The construction industry allows for automatic "card-based" certification if over 55% of workers sign up. Additionally, the OLRB can impose "remedial certification" in any sector if the employer commits severe unfair labour practices that prevent the true wishes of the employees from being ascertained in a vote.
Can I object to the union certification if I don't want to be unionized?
Employees can object or file interventions, but they must strictly adhere to the OLRB's filing deadlines and procedures. The Board routinely rejects late petitions or objections, and showing up at a hearing without having filed the proper paperwork on time will likely result in your voice not being heard.
How fast does a union vote happen after an application is filed?
The OLRB typically orders a secret ballot vote to take place within five business days from the date the certification application is filed. This extremely compressed timeline is designed to minimize workplace disruption and prevent employer interference.
When is the right time to reach out to a lawyer during a union drive?
Because OLRB dispute timelines are notoriously short—often requiring employers to formally respond to a certification application within just two business days—securing legal counsel at the very first rumor of organizing or immediately upon receiving OLRB notices is crucial.
Common Scenarios
- A group of factory workers quietly signs union cards until they reach 45% support. The union applies to the OLRB, triggering a secret ballot vote on the factory floor five days later, which the union wins by securing 50% plus one of the cast ballots.
- During a union drive at a retail chain, management threatens to reduce hours if the union gets in. The union files an unfair labour practice complaint, prompting the OLRB to grant remedial certification without a successful vote because the employer unlawfully intimidated the staff.
- A trade union files an application to certify carpenters working for a municipality. Because it falls within the construction industry rules of the LRA and the union submitted cards for 60% of the workers, the OLRB certifies the union on a card-check basis rather than holding a vote.
- The employer disputes a certification application, arguing that five of the twenty employees in the proposed unit perform managerial duties and should be excluded. The OLRB holds a hearing to assess the actual duties of these workers to finalize the bargaining unit composition.
- A group of employees opposing the union arrives late to an OLRB certification hearing and attempts to submit a petition against the union. Due to strict procedural fairness rules, the Board declines to hear their evidence, focusing only on the timely submissions.
What You Should Know
- Employers must respond to OLRB certification applications almost immediately, as failure to meet the strict two-day response deadline can result in the Board making decisions without your input.
- Management personnel must carefully avoid interrogating employees about their union sympathies, making promises, or issuing threats during a drive, as this can trigger automatic remedial certification.
- If you are an employee wishing to intervene or object to a certification application, ensure your paperwork is filed exactly according to OLRB rules and deadlines, as natural justice arguments rarely save late filers.
- Never attempt to navigate the Labour Relations Board's unique rules alone; the high stakes and rapid pace of certification proceedings require the immediate involvement of a lawyer with specific expertise in Ontario labour relations.
Featured Cases
Holland L.P. v. Labourers International Union of North America et al.
2026 ONSC 2219 (CanLII) · 2026-04-17Judicial Review: Labour Board Jurisdiction Dismissed
This is a judicial review of a Labour Relations Board decision concerning the jurisdiction to certify a union for employees performing maintenance on railway infrastructure. The Divisional Court dismissed the application, upholding the Board's finding that the work fell under provincial jurisdiction rather than federal railway jurisdiction, applying the correctness standard of review.
Sobeys Capital Inc. v. United Food and Commercial Workers International Union, Local 633
2026 ONSC 936 (CanLII) · 2026-02-13Judicial Review: OLRB Craft Unit Certification Reasonableness
This is a judicial review application concerning the reasonableness of the Ontario Labour Relations Board's decision to certify a craft bargaining unit for meat department workers at a Sobeys store. The Divisional Court applied the standard of review framework from Canada v. Vavilov, assessing whether the Board's determinations regarding the appropriate unit and craft status were reasonable. The Court affirmed deference to the specialized labour tribunal.
Thomas Cavanagh Construction Limited v. International Union of Operating Engineers, Local 793
2025 ONSC 6590 (CanLII) · 2025-11-27Judicial Review: LRB Certification of Working Forepersons
This is a judicial review of the Ontario Labour Relations Board's decisions certifying a union bargaining unit and determining the inclusion of working forepersons. The Divisional Court reviewed whether the Board's application of the 'majority-of-time' test and its factual findings met the standard of reasonableness under Vavilov.
SkipTheDishes Restaurant Services Inc. v. Canadian Union of Postal Workers
2025 ONSC 1399 (CanLII) · 2025-03-18Judicial Review: Union Certification Voting Dispute
This is a judicial review concerning the certification of a union by the Canadian Union of Postal Workers against SkipTheDishes Restaurant Services Inc. The court reviewed the process under the Labour Relations Act, 1995, specifically addressing issues related to voting and certification.
International Union of Operating Engineers, Local 793 v. Labourers’ International Union of North America, Ontario Provincial District Council
2025 ONSC 902 (CanLII) · 2025-02-14Judicial Review: Union Abandonment of Bargaining Rights
This is a judicial review of a decision by the Ontario Labour Relations Board regarding whether a union abandoned its bargaining rights due to inactivity. The Divisional Court examined whether the Board reasonably concluded that bargaining rights were abandoned before 2021 and whether post-abandonment activity could revive those rights under the Labour Relations Act, 1995.
Strasser & Lang v. Carpenters’ District Council of Ontario et al.
2023 ONSC 2247 (CanLII) · 2023-04-17Judicial Review: Union Certification Procedural Fairness
This is a judicial review of the Ontario Labour Relations Board's certification and reconsideration decisions. The Divisional Court examined whether the Board's procedural decisions, including the decision to certify a union without an oral hearing and its findings on the voluntariness of membership cards, were procedurally fair and reasonable under the Labour Relations Act, 1995.
Holland, L.P. v. Labourers’ International Union of North America et al;
2023 ONSC 870 (CanLII) · 2023-02-07Judicial Review: Premature Challenge to LRB Jurisdiction
This is a judicial review application brought by an employer challenging the Ontario Labour Relations Board's decision on jurisdiction in union certification proceedings. The Divisional Court held that constitutional questions regarding federal versus provincial jurisdiction do not constitute exceptional circumstances warranting the fragmentation of administrative proceedings.
Labourers’ International Union of North America, Local 183 v. The Daniels Group Inc.
2022 ONSC 3554 (CanLII) · 2022-06-15Judicial Review: Union Certification Dismissal
This is a judicial review of an Ontario Labour Relations Board decision dismissing a union certification application. The Divisional Court examined whether the Board reasonably exercised its discretion under s. 128.1(13) of the Labour Relations Act, 1995, to decline ordering a representation vote due to the absence of a reliable denominator for support levels. The Court upheld the Board's decision, finding the reasons coherent and justified.
Reliable Choice Contract Inc. v. Ontario Council of International Union of Painters and Allied Trades
2022 ONSC 1497 (CanLII) · 2022-03-14Judicial Review: OLRB Certification Procedural Fairness
This is a judicial review of an Ontario Labour Relations Board decision regarding a union certification application. The Divisional Court found that the Board breached procedural fairness by issuing conflicting filing instructions and relying on an unclear 'Notice to Community' over its own Rules of Procedure, particularly in the context of pandemic-related e-filing adaptations. The Court quashed the Board's decision and remitted the matter for reconsideration on the merits.
ASL Agrodrain Limited v. International Union of Operating Engineers
2019 ONSC 7194 (CanLII) · 2019-12-12Judicial Review of Union Certification Decision
An employer sought judicial review of the Ontario Labour Relations Board's decision certifying a union as the bargaining agent for heavy equipment operators. The Divisional Court reviewed the Board's decision, finding that the imposition of specific pleading requirements and the refusal to allow amendment of pleadings did not deny procedural fairness or constitute an error in certification based on card counts.
Kuehne + Nagel Ltd. v. Unifor
2019 ONSC 6779 (CanLII) · 2019-11-22Judicial Review: Union Certification & Discrimination
This is a judicial review of the Ontario Labour Relations Board's decisions dismissing an objection to union certification and denying a reconsideration request. The applicant challenged the Board's interpretation of section 15 of the Labour Relations Act regarding age discrimination in union constitutions and collective agreements, as well as procedural fairness concerns regarding the lack of an oral hearing. The Divisional Court found the Board's decisions and interpretations were reasonable and that no procedural unfairness occurred.
Audio Visual Services (Canada) Corp. v. Ontario Labour Relations Board
2019 ONSC 5717 (CanLII) · 2019-10-09Judicial Review: Union Certification and Bargaining Unit
This is a judicial review of the Ontario Labour Relations Board's decision to certify a union as the bargaining agent for a proposed bargaining unit. The Divisional Court examined whether the Board's determination of the appropriate bargaining unit and its interpretation of 'regularly employed' were reasonable, and addressed allegations of procedural fairness regarding the refusal to hold oral hearings.
Amec Foster Wheeler Americas Limited v. Labourers’ International Union of North America
2019 ONSC 5613 (CanLII) · 2019-10-01Union Certification: Provincial vs Federal Jurisdiction
This is a judicial review of the Ontario Labour Relations Board's decision regarding the certification of a union and the application of provincial labour relations law to employees working on a federally regulated nuclear waste remediation project. The Divisional Court applied the correctness standard to constitutional jurisdiction issues and upheld the Board's factual findings that the employer's work was not federally regulated.
Labourers’ International Union of North America, Local 183 v. The Daniels Group Inc.
2019 ONSC 3164 (CanLII) · 2019-05-23Judicial Review: Labour Board Certification & Exhaustion of Remedies
This is a judicial review application concerning the Ontario Labour Relations Board's decisions on union certification and bargaining rights. The court addressed whether the applicant prematurely sought judicial review by failing to exhaust the Board's internal reconsideration process under the Labour Relations Act, 1995, and whether the Board had the discretion to decline converting applications or ordering votes.
Trisect Construction Corporation v. Labourers’ International Union of North America
2019 ONSC 1790 (CanLII) · 2019-03-19This is a judicial review of a labour relations tribunal's decisions regarding union certification and the exclusion of evidence. The Divisional Court dismissed the application, confirming that the Board's rulings on relevance, scope, and procedural fairness were reasonable and within its discretion.
Brookfield Multiplex Construction Canada Limited v. Labourers’ International Union of North America
2018 ONSC 5824 (CanLII) · 2018-10-01Judicial Review: OLRB Certification Decision Upheld
This is a judicial review of a certification decision by the Ontario Labour Relations Board (OLRB) concerning a union certification application for construction labourers. The employer challenged the certification on grounds of employee status and the exclusion of evidence, arguing the OLRB fettered its discretion and denied natural justice. The Divisional Court upheld the OLRB's decision, finding its application of the bright-line test for bargaining rights and its policy of excluding post-application date evidence were reasonable.
Carpenters and Allied Workers, Local 27 v. Riverside Door & Trim Inc.
2017 ONSC 6057 (CanLII) · 2017-10-12Judicial Review: Union Certification Dismissed as Out-of-Time
The Divisional Court dismissed an application for judicial review challenging the Labour Relations Board's decision to dismiss a union certification application as out-of-time. The court found the Board's decision reasonable, its refusal to amend the filing date justified by material prejudice to the employer, and its use of written submissions procedurally fair.
Romspen Investment Corporation v. Courtice Auto Wreckers Limited
2017 ONCA 301 (CanLII) · 2017-04-13Bankruptcy Stay vs. Union Certification Appeal
This is an appeal regarding the intersection of federal bankruptcy law and provincial labour law, specifically whether a stay of proceedings under a receivership order should be lifted to allow a union to proceed with a certification application and unfair labour practice complaint. The court balanced the prejudice to creditors against the employees' statutory labour rights under the Labour Relations Act, 1995.
H. v International Union of Painters and Allied Trades
2017 ONSC 91 (CanLII) · 2017-01-11Judicial Review: Labour Board Union Certification & Damages
This is a judicial review application concerning the Labour Relations Board's decisions on union certification, grievance referrals, and union security damages. The Divisional Court found that the challenge constituted a collateral attack, that the Board acted fairly procedurally, and that its assessment of damages was reasonable.
College Employer Council v Ontario Public Service Employees Union
2016 ONSC 7768 (CanLII) · 2016-12-09Judicial Review: Union Certification under Colleges CBA
This is a judicial review application concerning the certification of a union under the Colleges Collective Bargaining Act, 2008. The Divisional Court reviewed the Labour Relations Board's interpretation of statutory terms regarding certification votes and workforce fluctuation, finding the Board's decision reasonable.