Why most Canadian renovations go over budget — and how the quote predicted it

Here is the number every Canadian homeowner should sit with before they sign anything. In a 2025 Houzz Canada survey, roughly two out of three homeowners reported finishing over their original renovation budget — most by at least 10 percent. A 2025 report out of Quebec put it a different way: of more than 155,000 renovation projects, over 40 percent of homeowners had underestimated their costs. Different surveys, same verdict. Going over budget isn't the unlucky exception. It is closer to the default outcome.

That distinction is the whole point of this guide. Homeowners brace for the wrong thing. They stare at the bottom-line price and ask “can I afford this number.” But the number isn't what hurts them. What hurts them is the work that the number quietly didn't include — the sentence that wasn't on the page, the allowance set too low, the exclusion nobody read. A renovation budget is rarely killed by the price you saw. It is killed by the costs you didn't.

Where the money actually leaks

Every overrun I have ever priced traces back to one of a handful of sources. Each one has a fingerprint in the quote.

1. Scope changes and upgrades mid-project. The single most cited cause in the survey data, and partly unavoidable — you see the kitchen taking shape and decide the better tile is worth it. Fair. The danger is the unintended version: scope that creeps because the original quote never pinned it down. See how change orders happen.

2. Allowance overages. An allowance is a placeholder dollar figure for something you haven't chosen yet — tile, fixtures, flooring. It is a legitimate, normal part of a Canadian quote. The overrun happens when the placeholder was set below what you'll actually pick. The allowance isn't the red flag; the mismatch between the allowance and your taste is.

3. Vague scope language. The phrases that read fine until you understand they price nothing: “as required,” “as needed,” “patch and repair.” Each is an unpriced decision waiting to become a bill. This is big enough that it has its own guide.

4. Unstated assumptions. Who supplies the appliances? Who carts away the debris? Was the quote priced assuming the walls behind the old kitchen are square and sound? The things a contractor took for granted, and you never knew were in question. See the assumptions hiding in your quote.

5. Permits, inspections, and disposal. Real line items that quietly vanish from thin quotes. Permits have a cost and a timeline. Waste disposal on a gut reno is not trivial. If they aren't in the quote, they aren't free — they're deferred.

6. The genuine surprise. The wall opens and there's knob-and-tube wiring or rot. Unforeseeable and fair to charge for — and the reason a 10–15% contingency on top of any quote is planning, not pessimism, especially in older Canadian housing stock.

The pattern that ties them together

Notice what five of those six have in common. They are not failures of the price. They are failures of specificity. The quote was silent somewhere, and silence in a construction document always resolves in the same direction — toward more money, later, when your leverage is gone because the walls are already open and the contractor is already booked.

How to read a quote for overrun exposure

• Hunt the weasel phrases. “As required,” “as needed,” “as discussed,” “TBD,” “by others.” Each is a decision nobody priced. Get each one defined in writing before signing.
• Test every allowance against a real product. Go price the tile you actually want. If it's above the allowance, you just found a future overrun — negotiate the number now.
• Read the exclusions list and respect it. A quote that states what isn't included was written by someone experienced. No exclusions section usually means the exclusions exist anyway, just undocumented.
• Confirm permits, disposal, and cleanup are priced — or budget for them yourself.
• Hold 10–15% in contingency on top of the quote, untouched, for the genuine surprise.
• Ask the contractor: “On a project like mine, what is the most likely surprise?” The good ones answer instantly and specifically. That answer tells you exactly where to aim your contingency.

None of this requires line-item pricing or market-rate comparisons — a single fixed price with no breakdown is completely normal in Canadian residential work. The job isn't to second-guess the contractor's number. It's to make sure the number actually covers the project you think you're buying.