Vavilov Standard of Review Explained for NCA Candidates (2026)

What Vavilov Changed and Why It Matters

Before 2019, the standard of review in Canadian administrative law was governed by Dunsmuir v New Brunswick, 2008 SCC 9. Dunsmuir collapsed the previous three standards of review (correctness, reasonableness simpliciter, and patent unreasonableness) into two: correctness and reasonableness. That simplification was welcome, but Dunsmuir created its own problems. The most significant was the "standard of review analysis" — a multi-factor balancing test that required courts to weigh the expertise of the decision-maker, the purpose of the enabling statute, the nature of the question, and the presence or absence of a privative clause. In practice, this analysis consumed pages of judicial reasoning and produced inconsistent results. Different courts reached different conclusions about which standard applied to virtually identical questions.

Vavilov addressed this head-on. The Supreme Court of Canada, in a rare 7-2 majority, replaced the contextual analysis with a rule-based framework. The starting point is now a presumption: all judicial review of administrative decisions on the merits attracts reasonableness review. This presumption can only be rebutted in five specific situations, each clearly defined. The goal was predictability — and on this count, Vavilov largely succeeded.

For NCA candidates, the shift from Dunsmuir to Vavilov is not merely historical background. The NCA Administrative Law exam tests your ability to identify the correct standard and apply it to the facts. You must know Vavilov cold. If you spend time on the standard of review analysis under Dunsmuir in your exam answer, you are answering a question that is no longer being asked.

The Starting Point: Presumption of Reasonableness

Under Vavilov, the default standard of review is reasonableness. This means that when a court reviews a decision made by an administrative body — a tribunal, a minister, a regulatory board, a professional disciplinary committee — the court presumes that the decision should be reviewed on a reasonableness standard. The court does not ask whether the decision was correct; it asks whether the decision was reasonable.

The presumption is important because it reflects a core constitutional value: legislative supremacy. Parliament or a provincial legislature chose to delegate the decision to an administrative body rather than a court. Deference to that choice is not a concession — it is a constitutional requirement. The legislature created the decision-maker, gave it a mandate, and equipped it with expertise. The reviewing court must respect that delegation.

The Supreme Court in Vavilov was explicit about what reasonableness requires. At paragraph 99, the Court stated that a reasonable decision must bear the hallmarks of "justification, transparency, and intelligibility" and must be "justified in relation to the relevant factual and legal constraints that bear on the decision." This is the definition you should be able to cite from memory in your NCA exam.

What Makes a Decision Unreasonable Under Vavilov

Vavilov identifies two fundamental categories of deficiency that render an administrative decision unreasonable. The first is a failure of internal logic — the reasoning within the decision itself is flawed. This includes circular reasoning, false dilemmas, unfounded generalizations, and conclusions that cannot logically follow from the premises. The second category is a failure to account for relevant factual and legal constraints. This includes ignoring binding precedent, disregarding the text of the statute, failing to consider relevant evidence, or failing to genuinely grapple with the key issues and arguments raised by the parties (Vavilov, para 128).

In an NCA exam, when you are asked to apply reasonableness review, your task is to identify which category of deficiency is present in the hypothetical decision. Read the facts carefully. Does the decision contain a logical gap — a conclusion that does not follow from the reasoning? Or does the decision ignore something it was legally required to consider? Name the specific flaw, cite the relevant paragraphs of Vavilov, and explain why the flaw renders the decision unreasonable.

The Five Exceptions: When Correctness Applies

The presumption of reasonableness is rebutted in exactly five situations. When any of these five applies, the reviewing court applies correctness review instead — meaning the court determines whether the decision was right, not merely whether it was reasonable. These five exceptions are the most frequently tested component of Vavilov on the NCA exam.

Exception 1: Legislative Intent — Express Standard in the Statute

If the enabling statute itself prescribes the standard of review, courts must respect that legislative choice. For example, if a statute says that a decision may be overturned only if it is "unreasonable," the standard is reasonableness. If the statute says the court should determine the matter "on the merits" or "on a standard of correctness," then correctness applies. This exception is relatively rare in practice, but it reflects Vavilov's commitment to legislative supremacy as the organizing principle of the framework.

Exception 2: Statutory Appeal Mechanism

When the legislature provides a statutory right of appeal from an administrative decision to a court, the presence of that appeal mechanism signals legislative intent that the court should play a more active role. In such cases, the appellate standards from Housen v Nikolaisen, 2002 SCC 33 apply: questions of law are reviewed on a correctness standard, questions of fact on a palpable and overriding error standard, and questions of mixed fact and law on a palpable and overriding error standard unless an extricable question of law is identified. This exception is extremely important because many regulatory statutes include a right of appeal, and recognizing the appeal mechanism changes the entire analysis.

Exception 3: Constitutional Division of Powers

When an administrative decision raises a question about the constitutional division of powers between federal and provincial governments — a question under sections 91 and 92 of the Constitution Act, 1867 — correctness review applies. This is because constitutional boundaries are legal questions that cannot vary depending on who is answering them. A federal tribunal cannot determine the scope of provincial jurisdiction, and deference to the tribunal's interpretation would risk inconsistent constitutional boundaries.

Exception 4: General Questions of Law of Central Importance

This exception is narrow. It applies to questions of law that are "of central importance to the legal system as a whole" and are "outside the decision-maker's specialized area of expertise." The Supreme Court in Vavilov emphasized that this exception should be applied rarely. It is designed for situations where a consistent legal answer is needed across the entire legal system — not merely across the decisions of one tribunal. In practice, few questions qualify. But on an NCA exam, if a hypothetical presents a question about a general legal principle that has implications well beyond the administrative body's mandate, this exception may be triggered.

Exception 5: Jurisdictional Boundaries Between Administrative Bodies

When two or more administrative bodies have overlapping or adjacent mandates and a question arises about which body has jurisdiction over a particular matter, correctness review applies. This is because allowing each body to define its own jurisdictional boundaries would create the risk of conflicting answers. A labour relations board and a human rights tribunal, for example, might both claim jurisdiction over a workplace discrimination complaint. Correctness review ensures a single, authoritative answer to the jurisdictional question.

The Critical Distinction: Vavilov Does Not Apply to Procedural Fairness

This is the single most common mistake NCA candidates make on the Administrative Law exam, and it costs marks every single sitting. The Vavilov framework applies to reviews of the merits of administrative decisions. It does not apply to challenges based on a breach of procedural fairness. Procedural fairness is a separate and parallel ground of review. If the question asks whether the decision-maker gave the applicant a fair hearing — whether there was adequate notice, an opportunity to be heard, reasons for the decision, an unbiased decision-maker — you do not use the Vavilov framework at all. You use the Baker factors instead.

In your exam answer, treat standard of review under Vavilov and procedural fairness under Baker as two distinct analytical steps. If a question raises both issues, address them separately. Never collapse them into a single analysis. The Supreme Court was clear on this point: the Vavilov framework governs the substantive review of the decision; procedural fairness is assessed on its own terms.

How to Structure a Vavilov Answer on the NCA Exam

When you encounter a standard of review question on the NCA Administrative Law exam, follow this structure. First, state the presumption: under Vavilov, the default standard of review for administrative decisions on the merits is reasonableness. Second, determine whether any of the five exceptions applies. Work through each exception that the facts might support, and explain why it does or does not apply. Third, once you have identified the applicable standard, apply it to the facts of the question. If the standard is reasonableness, assess whether the decision is justified, transparent, and intelligible. If the standard is correctness, determine whether the decision was legally correct.

The most common pitfall is jumping directly to the application without first establishing the standard. This is a structural error that examiners notice immediately. Even if your application is excellent, failing to establish the standard first means you have not demonstrated that you understand the framework. The Vavilov analysis is sequential: presumption, then exceptions, then application.

A second common pitfall is treating Vavilov as a checklist rather than an analytical framework. Do not simply list the five exceptions and say "none apply." If the facts of the question clearly engage one or two exceptions, spend your time on those. Briefly note that the others are not relevant. Examiners want to see that you can identify the live issues and analyze them in depth, not that you can recite every element of the framework without engaging with the facts.

Vavilov and the Dore Framework

One of the most nuanced points in the Vavilov decision is its treatment of the Dore v Barreau du Quebec, 2012 SCC 12 framework. Vavilov expressly preserved Dore (at paragraph 57). This means that when an administrative decision engages Charter values — not the constitutional validity of legislation, but the exercise of discretion in a way that limits Charter-protected interests — the Dore framework applies, and the standard of review remains reasonableness.

The distinction matters enormously on the exam. If a question presents a statute that is alleged to violate the Charter, the constitutional question triggers correctness review under Vavilov exception 3. But if a question presents an administrative decision that limits a Charter right in the exercise of statutory discretion — for example, a professional disciplinary body sanctioning a lawyer for speech that engages freedom of expression — the Dore framework applies. Under Dore, the question is whether the decision-maker proportionately balanced the Charter value against the statutory objective. The standard remains reasonableness. For a deeper analysis of how to distinguish Dore from Oakes on the exam, see our article on Dore vs Oakes in administrative law.

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