Suing a Contractor in Ontario Small Claims Court

Contractor disputes are among the most emotionally charged Small Claims Court cases, because they usually involve someone's home and a relationship that started with trust that later broke down. Whether you're the homeowner who feels let down or the contractor who feels unfairly blamed, the same principles of clear documentation and specific facts apply.

Common contractor dispute scenarios

• Incomplete work — the contractor stopped before finishing the agreed scope.
• Defective work — the work was completed but done poorly, requiring repair or redoing.
• Cost disputes — the final bill significantly exceeded the original estimate, without a clear explanation.
• Non-payment — from the contractor's side, a client who won't pay for completed, satisfactory work.
• Deposit disputes — disagreement over whether a deposit should be refunded when a project doesn't go ahead or ends early.

If you're the homeowner or client

If you believe work was incomplete or defective, your strongest position generally comes from being specific: what exactly is wrong or missing, compared against what was actually agreed. Vague dissatisfaction ("the work just isn't good") is much harder to prove than a specific, itemized list of deficiencies compared against the original scope.

Before filing, it's often worth giving the contractor a documented opportunity to fix the problem or respond, both because many disputes resolve at that stage and because it shows you acted reasonably if the matter does proceed further. See the demand letter builder for a structured way to do this.

If you're the contractor

If you're a contractor pursuing unpaid fees, your strongest position generally comes from showing exactly what was agreed, what was actually delivered, and how the final amount was calculated. Keep records of any change orders or scope changes made along the way, ideally with the client's written acknowledgment, since undocumented changes are one of the most common sources of billing disputes.

If you're defending against a claim that your work was defective, focus on documenting the work as it was actually completed — photos taken during and after the job are often more persuasive than any explanation given after the fact.

Why the original agreement matters so much

Whatever form it took — a formal written contract, an email exchange, or a verbal agreement — the original scope and price is usually the central reference point for a contractor dispute. Both sides should expect to be asked: what exactly was agreed to, and does the finished work (or the final bill) match that? Keeping any written record of the original agreement, and any changes made along the way, is the single most useful thing either side can do to strengthen their position.

Documenting the work itself

Photos and videos, taken at different stages of a project, are unusually persuasive evidence in contractor disputes because they capture the physical reality of the work directly, without relying on anyone's memory or interpretation. If a project is still underway or was recently completed, document its current condition now — this kind of evidence only gets harder to gather as time passes and conditions change.

Getting an independent opinion on the work

For disputes about whether work was actually defective, an independent opinion — for example, from another qualified tradesperson who inspects the work — can carry real weight, since it isn't coming from either party with a stake in the outcome. This isn't required for every case, but for a significant dispute about workmanship, it's often worth the cost of getting one.

Naming the right defendant

Confirm whether you dealt with an individual contractor, a sole proprietorship, or a corporation, since this affects who should properly be named in the claim. See who can sue for guidance on naming parties correctly — the same principles apply to naming the correct defendant.

Disputes over deposits

Whether a deposit should be refunded generally depends on what the original agreement said about deposits, and on what actually happened — did the contractor begin work, did the client cancel, or did the relationship break down before work started at all? Review whatever terms were agreed about deposits at the outset, since this often resolves the question directly.

Before you file

Contractor disputes often benefit from one more attempt at direct resolution before filing, given how much a continuing relationship or reputation can matter to both sides. A clear, specific demand letter — see the demand letter builder — gives the other side a documented, serious opportunity to resolve things before a case is filed.

Common mistakes

• Not documenting the work with photos as it progressed, relying only on memory later.
• Letting scope changes go unrecorded, creating confusion about what was actually agreed.
• Naming the wrong defendant — an individual instead of their corporation, or vice versa.
• Waiting too long to raise a defect, making it harder to show the problem was connected to the original work.
• Skipping an independent opinion on a significant workmanship dispute where one would have carried real weight.

Frequently asked questions