Last Updated: August 22 2026
In Ontario, when can a contractor legally charge more than an estimate, and what should you do if the final invoice exceeds the estimate?
In Ontario, pricing estimates are usually protected for consumer agreements under the Consumer Protection Act, 2002, S.O. 2002, c. 30, Sched. A, s. 10: if an estimate is included in a consumer contract, the supplier generally cannot charge more than the estimate by more than 10%, and the consumer may require the supplier to provide the goods or services at the estimated price if that threshold is exceeded. For business-to-business situations, where a specific estimate statute may not apply, courts may treat an estimate as not automatically forming a binding contract and may consider whether the contractor gave adequate notice of changes and the fairness of compensation based on conduct and changed circumstances, including the approach discussed in Go Island Hopper Helicopters Ltd. v. Rotech Industries Inc., 1996 CanLII 2448. If your invoice is higher than the estimate, request the written basis for the increase, ask whether additional/different work was approved in writing, and consider a quick review of your agreement so you know your options before you pay the balance. VP Legal Services & Notary provides paralegal and notary support across Ontario, and you can call (437) 286-1499 to discuss next steps for your situation and whether you can push back on the overage.
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When May Pricing Vary Above the Estimate?
The law typically requires that an estimate will be in the ballpark of the final bill. The law also appreciates that the world of business and commerce requires pricing flexibility within contractual relationships whereas often circumstances arise where a final price is impossible to predict. However, it almost goes without saying or suggesting that where an agreement is based only on an estimated price, the final price will be held as completely arbitrary and at whim of the supplier. On the contrary, the law imposes certain boundaries; however, it is important to note that the boundaries may vary depending upon the nature of the relationship; whereas, for consumer-to-business relations, certain restrictions regarding estimated pricing will be applicable per the statutory law. For business-to-business relations, certain restrictions regarding estimated pricing may apply per the common law.
Note: Please contact VP Legal Services & Notary by phone at: (437) 286-1499 to discuss any specific questions that you may have.
The Law
My Contractor is Charging More Than the Price Quoted. Is This legal?
Generally, it appears that only business-to-consumer relations have pricing estimates protected and governed by statute. In Ontario, the Consumer Protection Act, 2002, S.O. 2002, Chapter 30, Schedule A, provides that estimated pricing within a consumer agreement shall be within ten (10%) percent of the final pricing unless amendments were approved by the consumer and the supplier. Specifically, the Consumer Protection Act, 2002 states:
Estimates
10 (1) If a consumer agreement includes an estimate, the supplier shall not charge the consumer an amount that exceeds the estimate by more than 10 per cent.
Performance of consumer agreement
(2) If a supplier charges an amount that exceeds the estimate by more than 10 per cent, the consumer may require that the supplier provide the goods or services at the estimated price.
Subsequent agreement
(3) Nothing in this section prevents a consumer and a supplier from agreeing to amend the estimate or price in a consumer agreement, if the consumer requires additional or different goods or services.
For business-to-business matters, where a statute law addressing the issue of estimates fails to exist, the common law case of Go Island Hopper Helicopters Ltd. v. Rotech Industries Inc., 1996 CanLII 2448, appears to address the issue whereas it was said:
68 Further, in the event that there was only an estimate, I would apply the law enunciated by Wright J. in Kozik v. Melnick, [1991] O.J. No. 1259 (Ont. C.J.) which concerned a quantum meruit claim arising from the refurbishment of an aircraft. The court held at p. 5:
In approaching this matter I proceed on the assumption:
(1) That a man is entitled to fair compensation for effort expended.
(2) That an "estimate" is not a contract.
(3) That while an estimate may not constitute an enforceable agreement, the conduct of the claimant, viz.: (a) his failure to keep the customer advised of the necessity to increase the fees beyond the estimate, and (b) the failure to inform the customer that other charges would be charged separately may dictate that the original estimate be adhered to. See: Thomson, Rogers and Croyden Furniture Systems Inc. (1982), 16 A.C.W.S. (2d) 196.
(4) That where circumstances change the customer is entitled to be warned of the change. Re: Solicitor (May 10th, 1967).
(5) That where an honest misunderstanding arises over the extent of the work to be done for the amount stipulated the Court will lean against the party who might have taken steps to have avoided the misunderstanding.
Re: Phelan, O'Brien, Shannon, Lawer and Kozaroff (1981), 8 A.C.W.S. (2d) 494.
69 If this is an estimate case as opposed to a contract case, in my view the plaintiff was entitled to be warned of any change in the defendant's estimate.
Conclusion
Generally, when a consumer receives an estimate from a supplier, the consumer may reasonably rely upon the pricing within the estimate whereas the supplier is statutorily held to rendering an invoice with final pricing within ten (10%) percent of the estimate. Similarly, for estimates in business-to-business relations, rather than business-to-consumer relations, the supplier will, generally, be held to rendering an invoice with final pricing within a reasonable range of the estimate.
The law, generally, requires suppliers to provide notice of change for review and approval by the customer, whether the customer is a consumer or a business, prior to allowing the final amount charged to vary significantly from the original estimate. However, even with this said, it may be that a strong argument that the legal principles of quantum meruit, being a fair value, should apply.
NOTE: An extensive array of inquiries such as “lawyers in my area” or “top lawyer in” frequently indicates a desire for prompt and competent legal counsel instead of a particular designation. In Ontario, certified paralegals are governed by the same Law Society that regulates lawyers and are permitted to represent clients in specified litigation issues. Their role is grounded in advocacy, legal reasoning, and procedural expertise. VP Legal Services & Notary offers legal representation within its sanctioned mandate, focusing on strategic positioning, evidence preparation, and compelling advocacy aimed at securing effective and advantageous outcomes for clients.
