A contract of adhesion is a standard form contract drafted by one party and offered to the other on a take-it-or-leave-it basis, with no real chance to negotiate the terms. Think of the terms of service you click to accept, an insurance policy, or a cell phone plan. In Ontario, these contracts are generally enforceable, but courts will refuse to enforce a contract of adhesion, or a specific clause inside it, where the deal is unconscionable or the wording is unclear.
Most contracts you sign in business and daily life are contracts of adhesion. You did not haggle over the fine print of your bank account, your software subscription, or your gym membership. That does not make the agreement invalid. What it does is shift how an Ontario court reads the document if a dispute arises, and it gives the weaker party some protections that a freely negotiated contract would not attract. This guide explains what a standard form contract is, when courts will and will not enforce one, and how businesses can draft terms that hold up.
What Is a Standard Form Contract?
A standard form contract is a pre-written agreement that one party uses across many transactions without changing the terms for each customer. The drafting party prepares the document once, then presents the same terms to everyone. The other side signs, clicks, or otherwise accepts, but does not bargain over the content.
Standard form contracts run the economy. They let a business sell to thousands of customers without negotiating a fresh agreement each time. Common examples include:
- Insurance policies
- Software and app terms of service
- Residential and commercial leases on landlord forms
- Bank and credit card agreements
- Telecom and utility service plans
- Online purchase terms and clickwrap agreements
The phrase "contract of adhesion" describes a standard form contract from the angle of bargaining power. The weaker party "adheres" to terms set by the stronger one. The two phrases point at the same documents. Standard form describes how it was drafted, and adhesion describes the imbalance in who set the terms.
Are Contracts of Adhesion Enforceable?
Yes, as a starting point. Ontario courts enforce standard form contracts every day. The fact that one party wrote the terms and the other had no chance to change them does not, on its own, make the contract void. A person who signs a document is generally bound by it, whether or not they read it. Courts respect freedom of contract and the certainty that businesses and consumers rely on.
The take-it-or-leave-it nature of the deal matters, though. Because one party controlled the drafting and the other had little choice, courts apply two doctrines that can blunt or cancel unfair terms: the doctrine of unconscionability, which can strike down a clause or a whole contract, and contra proferentem, which resolves unclear wording against the party that wrote it. Both are explained below.
There is also a separate point about online and clickwrap terms. A court will look at whether the customer had reasonable notice of the terms and a genuine chance to review them. Burying a harsh clause where no reasonable person would find it can undermine enforceability, even before unconscionability comes into play.
When Will a Court Refuse to Enforce a Contract of Adhesion?
A court will set aside a contract of adhesion, or a clause within it, mainly through the doctrine of unconscionability. The leading case is the Supreme Court of Canada decision in Uber Technologies Inc. v. Heller, decided in 2020.
In that case, Mr. Heller drove for Uber in Ontario. To work, he had to accept Uber's standard form services agreement. Buried in it was a clause requiring any dispute to be resolved by arbitration in the Netherlands, with up-front fees of about US$14,500, close to his annual income. When Mr. Heller tried to bring a class action in Ontario, Uber pointed to the arbitration clause. The Supreme Court refused to enforce it.
The Court set out a two-part test for unconscionability:
- Inequality of bargaining power. One party must be unable to protect its interests in the bargaining process, because of some weakness or vulnerability. A standard form contract presented on a take-it-or-leave-it basis, with a large gulf in sophistication between the parties, can establish this.
- A resulting improvident bargain. The terms must unduly advantage the stronger party or unduly disadvantage the weaker one. The arbitration clause did exactly that, since it effectively shut Mr. Heller out of any remedy.
Both parts have to be present. Uber had drafted a clause that no driver could realistically use, inside a contract no driver could negotiate. That combination made the clause unconscionable, so the Court declined to enforce it.
The lesson for businesses is direct. Using a standard form contract is fine. Slipping a one-sided, punishing clause into one that the other party cannot negotiate and may not understand is where enforceability breaks down.
How Courts Interpret Unclear Terms: Contra Proferentem
Even when a contract of adhesion is fully enforceable, a court still has to decide what an ambiguous clause means. Here a second principle helps the weaker party: contra proferentem, which means "against the one who put it forward."
Under this rule, if a clause is genuinely open to more than one reasonable meaning, the court resolves the ambiguity against the party that drafted it. The logic is fairness. The drafter chose the words and was in the best position to make them clear, so the drafter bears the cost of any confusion. The rule applies with particular force to standard form contracts, where one side wrote the whole thing and the other had no input.
Contra proferentem is a rule of last resort, not a first move. A court only reaches for it after reading the contract as a whole, considering what the parties intended at signing, and weighing the surrounding circumstances. If the words are clear, clear wording governs, even if the result favours the drafter.
One more practical note on standard form contracts and the courts. The Supreme Court in Ledcor Construction Ltd. v. Northbridge Indemnity Insurance Co., decided in 2016, confirmed that how a standard form contract is interpreted can be reviewed for correctness on appeal. Because the same wording binds many people, the meaning of a standard form clause has effects well beyond the two parties in front of the court. That makes consistent interpretation important, which is another reason precise drafting pays off.
Are Oral and Verbal Contracts Enforceable in Ontario?
Yes, in most cases. An oral contract, also called a verbal contract, is generally just as binding as a written one in Ontario. If there is an offer, acceptance, an intention to create legal relations, and something of value exchanged, you have a contract whether or not anyone wrote it down. The common belief that "a verbal agreement is not worth the paper it is printed on" is wrong as a matter of law.
The real problem with oral contracts is proof, not validity. If the parties disagree later about what was promised, there is no document to point to. The dispute turns on memory, emails, conduct, and credibility, which is expensive and uncertain to litigate.
There are also exceptions where the law requires writing. The Statute of Frauds in Ontario provides that certain agreements are not enforceable unless they are evidenced in writing and signed. The most important examples are:
- Contracts for the sale of land or an interest in land
- Guarantees, meaning a promise to answer for another person's debt or default
For these categories, a purely verbal deal will usually not hold up, although a narrow doctrine called part performance can sometimes rescue an oral land agreement where one party has clearly acted on it. Outside these special cases, oral contracts are enforceable. Even so, putting agreements in writing is simply good business, because it removes the proof problem before it starts.
Drafting Tips for Businesses That Use Standard Form Contracts
If your business relies on a standard form contract, a few drafting habits go a long way toward keeping it enforceable.
- Write in plain, clear language. Ambiguity gets read against you under contra proferentem. The clearer the clause, the more likely a court enforces it as written.
- Make key terms conspicuous. Limitation of liability clauses, arbitration clauses, automatic renewals, and anything unusual or harsh should stand out, not hide in dense fine print. Bold them, give them their own heading, or flag them at signing.
- Get a real signature or acknowledgement. A signed document, or a clear click-to-accept step that shows the customer saw the terms, supports the argument that they agreed with notice.
- Keep the bargain reasonable. A term that hands you a crushing advantage over a weaker party invites an unconscionability challenge. Reasonable terms survive scrutiny.
- Avoid burying the punchline. If a clause would surprise a reasonable customer, surfacing it early protects you. Uber v. Heller shows how a hidden, one-sided clause can sink an otherwise valid contract.
- Review and update periodically. Laws change and so do the standards courts apply. A contract drafted years ago may contain clauses that no longer hold.
Good standard form drafting is not about loading the document with one-sided terms. It is about clear terms a court will respect, presented in a way the other party genuinely accepts.
Related Questions
Is a contract of adhesion legal?
Yes. A contract of adhesion is a normal and legal way to do business in Ontario. Most consumer and commercial contracts are standard form agreements offered on a take-it-or-leave-it basis. The format is enforceable. A court only intervenes where a specific clause is unconscionable or where unclear wording must be read against the drafter.
What is the difference between a standard form contract and a negotiated contract?
A standard form contract uses the same pre-written terms for every customer, with no bargaining. A negotiated contract is built from back-and-forth between parties who each shape the terms. Courts give weaker parties extra protection in standard form contracts, since one side controlled the drafting and the other simply adhered to it.
Can you get out of a contract of adhesion?
Sometimes. You may be released from a clause, or the whole contract, if it is unconscionable under the Uber v. Heller test, meaning there was unequal bargaining power and a resulting improvident bargain. Unclear terms may also be read in your favour. Otherwise, a signed standard form contract is generally binding.
Is a verbal contract legally binding in Ontario?
Usually yes. A verbal contract is enforceable in Ontario if it has offer, acceptance, intention to create legal relations, and consideration. The main exceptions are contracts for the sale of land and guarantees, which the Statute of Frauds requires to be in writing. The practical weakness of any oral contract is proving what was agreed.
What makes a contract clause unconscionable?
A clause is unconscionable when two things are present: an inequality of bargaining power that leaves one party unable to protect its interests, and a resulting bargain that unduly favours the stronger party. The Supreme Court applied this test in Uber v. Heller to refuse to enforce an arbitration clause hidden in a standard form contract.
Sources & Official Resources
Ontario Statutes Cited
Case Law Cited 2. Uber Technologies Inc. v. Heller, 2020 SCC 16 3. Ledcor Construction Ltd. v. Northbridge Indemnity Insurance Co., 2016 SCC 37
Helpful Resources 4. Supreme Court of Canada, Case in Brief: Uber v. Heller 5. Ontario, Contracts: best practices and types 6. Law Society of Ontario, Find a Lawyer
Contact Hadri Law
If your business uses standard form agreements, or you are facing a contract that was handed to you on a take-it-or-leave-it basis, the team at Hadri Law can help you draft terms that hold up or assess whether a clause is enforceable. We advise founders and businesses across Ontario on contract drafting, review, and negotiation, and you can read more in our guide to the key elements of a solid commercial contract. We work in English, French, Spanish, and Catalan.
Call us at (437) 974-2374 for a free consultation.
This article is general information about Ontario and Canadian contract law, not legal advice. Your situation may turn on facts specific to your agreement. Speak with a lawyer before acting.
