A homeowner in Barrhaven called me last fall, three weeks into a basement renovation with a different contractor. She had signed a fixed-price contract, and the change orders piling on top had already pushed it more than a third higher. She wanted to know if that was normal.
It isn't. Not for a basement that was fully designed before signing. When I went through the change-order paperwork with her, eight of nine items were things that should have been on the original quote: the bulkhead around the duct, the access panel for the cleanout, the proper egress window size for an Ottawa basement bedroom, the GFCI for the bathroom rough-in. None of those were her decision. All were obvious from the drawings.
That contractor wasn't building a renovation. He was building one project in two prices, with the gap between them disguised as her fault.
What a real change order is
A change order is a written, signed amendment to your contract that adds, removes, or modifies scope. It exists for one reason: to keep both parties honest when the work changes from what was originally signed.
A legitimate change order has six things on it:
- A description of the change in plain English, naming what's being added or removed
- The reason for the change (homeowner request, code requirement found mid-project, hidden condition discovered)
- The materials cost with supplier name and product specifics
- The labour cost with hours and rate
- The schedule impact in days, if any
- Both signatures and a date, before the work happens
If a change order is missing any of those six elements, it's not a change order. It's an invoice with a fancy header.
The rule that protects you
Here's the rule that keeps a fixed-price contract fixed:
A fixed-price contract should only generate change orders if YOU change scope.
Read that twice. If the contractor finds something that should have been on the original scope, that's a quote error, not a change. The contractor eats it. That's literally what fixed-price means: they took the pricing risk in exchange for your business.
If you're getting change orders for things that were obvious from the drawings, the original quote was incomplete. That's the contractor's responsibility, not yours. Polite pushback usually solves it. Documented pushback always does.
Three legitimate change-order scenarios
Scenario 1: You changed your mind
You walked through the framed kitchen and decided you want a 30" wine fridge instead of a base cabinet. That's a real change. A legitimate change order for it itemizes each driver: the wine fridge itself, the cabinet panel to match the surrounding doors, the dedicated electrical circuit if not already roughed in, and the labour to install. Each line is named and priced separately. That's legitimate.
Scenario 2: A truly hidden condition
The crew opens up the bathroom wall and finds a cast-iron drain stack from 1962 that's developed a hairline crack. It needs replacement before drywall closes the wall. The change order breaks out materials, labour hours, and the plumbing inspection coordination as separate lines. That's legitimate, because nobody could have seen it before opening the wall.
The test: was this visible during the original site visit? If yes, it should have been quoted. If no, it's a real change.
Scenario 3: A code requirement triggered by a permit reviewer
The City of Ottawa permit reviewer requires an additional smoke detector circuit on the second floor because the renovation crossed the trigger threshold for whole-home upgrades. That wasn't in the original scope because nobody knew the threshold would trip. The change order names the requirement, the reviewer who triggered it, and the material and labour to satisfy it. That's legitimate.
The change-order moves that get abused
Abuse 1: The "while we're at it"
Mid-project, the contractor says "while we have the wall open, we should add a few more pot lights, run an extra outlet, upgrade to a slightly bigger range hood." Each one is a small change order on its own. By project's end, you've signed a dozen or more of them, and the running total is a meaningful slice of budget you never planned for.
Some of these are genuine improvements. Most are scope that should have been on the original quote, repackaged as upgrades you "asked for." Defense: never sign a change order without a 24-hour pause to think. Real upgrades survive a day of consideration.
Abuse 2: The unexplained line item
"Additional electrical." No description, no breakdown, no hours. Just a lump-sum number on a piece of paper presented at week six. If you ask what it covers, the answer is vague. This is rarely about that one line; it's about whether the contractor will get away with it. If they do, expect three more.
Defense: refuse to sign anything without a line-item breakdown. "Additional electrical" isn't a description. "Run new 20-amp circuit from panel to peninsula, two outlets and one switch loop, 4 hours labour" is.
Abuse 3: The retroactive change order
The work is already done. The contractor presents a change order for it on Friday afternoon. You feel cornered: refusing the signature feels like you're trying to skip a bill. The pressure is the point.
Defense: change orders signed after work is complete aren't change orders. They're invoices for unauthorized work. Your contract should require pre-work approval. If it doesn't, write a one-page amendment that does, before you sign anything else.
Abuse 4: The "verbal okay"
"You said it was fine when I mentioned it Tuesday." No paper trail, no number quoted at the time, just a recollection of a conversation. The bill arrives anyway.
Defense: nothing happens without a signed change order. Period. Not "we'll figure it out later." Not "trust me, it's small." A contractor who insists on verbal changes is either disorganized or building an inflation runway. Both end the same way.
The 24-hour rule
Every change order should sit on your kitchen table for 24 hours before you sign it. Pressure to sign immediately ("crew needs to know by tomorrow morning") is almost always artificial. A real schedule has 48 hours of buffer for a decision like this. If a contractor can't accommodate one day of consideration, that's information about how the rest of the project will go.
What healthy change-order activity looks like
On a fully designed Ottawa kitchen, expect 1 to 3 change orders totaling 1% to 3% of the contract value. Almost all should be homeowner-driven (you saw a fixture you liked better, you decided to add a feature). Maybe one will be a true hidden condition.
On an addition where structural unknowns are real, expect 3 to 8 change orders totaling 4% to 8% of contract value. A mix of homeowner and condition-driven. Higher than that suggests scope was incomplete at signing.
On a basement legalization in an older Ottawa home, expect 2 to 5 change orders totaling 3% to 6% of contract value. Mostly mechanical surprises (drain locations, ceiling heights triggering unexpected upgrades), some homeowner upgrades.
If you're 12% or more into change orders before substantial completion, your original quote was wrong. That's a conversation to have, calmly and in writing, with the contractor.
How to push back on a bad change order
Polite, written, dated. Do not get on the phone. Do not get emotional. Send an email that says, in effect:
- "I received change order #4 dated [date] for [description]."
- "I understand this work is being characterized as additional scope."
- "My contract scope on page X, line Y, includes [original scope quotation]."
- "Please explain why this is being treated as additional rather than included scope."
- "I'm happy to discuss, and I'll need a written response before signing."
That email costs you 10 minutes. Depending on the abuse pattern, it can save you a single small line or a large share of an inflated contract. Most contractors back off when they realize you're paying attention. The ones who don't are the ones you needed to confront anyway.
The bottom line
Change orders aren't inherently bad. They're a tool. In the hands of an honest contractor, they keep both parties aligned when reality intrudes on a contract. In the hands of a dishonest one, they're how a fixed-price quote quietly becomes a much larger bill while looking like the homeowner's fault.
The protection isn't avoiding change orders. It's defining scope so completely that there's almost nothing to change. That happens before signing, in the design and estimating phase. Real estimating is the cure for change-order abuse. There's no shortcut.
If a contract you're considering doesn't include a written change-order policy in plain language, ask for one before you sign. The conversation that follows will tell you everything you need to know.