Ontario law doesn't require an extra to be in writing to be real. Proving it happened is a different problem entirely.
Short answer
Legally, yes — Ontario contract law doesn't treat a verbal change order as void just because it wasn't written down, and it can still be folded into a lien claim. Practically, no — without a paper trail, you can rarely prove the scope or the price once it's disputed.
Ontario contract formation doesn't run on a special rulebook for spoken agreements. Treadstone Law's guide to contract formation states the underlying test is the same regardless of medium: “An offer — a clear proposal on specific terms. An acceptance — a clear, unqualified agreement to those exact terms.” A verbal instruction to proceed with extra work, met with a verbal “go ahead,” satisfies that test the same way an email exchange does.
It's also lienable. Treadstone Law's guide to extras and liens confirms that “because the Construction Act ties a lien to the value of what was actually supplied to an improvement, unpaid extras and change orders are generally capable of being folded into a lien claim alongside the original contract balance” — the Act doesn't ask whether the extra was documented before it counts the value.
The same source that confirms extras are lienable is blunt about what defeats a verbal one in practice: “no written record — verbal instructions with no paper trail make it hard to prove the extra was requested, let alone at what price.” A related Treadstone Law guide goes further, advising contractors directly: “Do Not Agree to Anything Verbally On-Site Under Pressure… Put Your Position in Writing” if a change order is disputed.
Worked example: a foreman verbally approves $6,400 of extra excavation during a site walk on a Tuesday. No confirming email or text follows. At final invoicing, the GC disputes both the scope and the price. The sub has no dated note, no photo, no confirming message — the extra remains legally real, but with nothing to corroborate it, it's effectively unrecoverable the moment the GC pushes back.
Crews sometimes treat “it's legally binding” and “I can collect on it” as the same thing. They aren't. See change order vs. change directive and pricing extras so they survive an audit for how to close that gap before the next disputed extra.
Related: extras versus scope, on paper, an electrical sub that priced eighty verbal extras.
A 30-minute call is enough to see where your contracts, quotes and lien deadlines are leaking money.
