Why do low renovation quotes end up costing more?

Because the missing money is usually missing scope: thin allowances, unmentioned disposal or permits, vague language that converts to change orders. The work the low quote didn't price still has to happen, and it gets priced later, mid-project, when you have no negotiating position.

How can I tell if a low quote is legitimate?

Normalize it against the others: same tax basis, compare allowance amounts, check who carries permits and disposal, and ask what explains the difference. A legitimate low bidder can answer specifically, such as lower overhead or a gap in their schedule. An evasive answer usually means the difference is missing scope.

Is it rude to ask a contractor why their quote is lower?

Not at all, and the answer is the most useful diligence you can do. Asking 'your quote came in well under the others; can you walk me through what might explain that?' is a fair, professional question that good contractors answer easily.

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Why the cheapest quote is usually the most expensive job

From the desk of QuoteGuard's founder — 19 years quoting residential construction in Ontario · June 2026

The cheapest quote has a gravitational pull. It feels like found money — same project, thousands less. After 19 years of watching how low quotes age, here is the uncomfortable mechanics of it: in renovation, the price can be wrong but the work cannot. The drywall doesn't care what the quote said. The bin rental, the permit, the extra day of electrical — they all happen and all cost money, and if the quote didn't carry them, the project will collect later.

Where the missing money hides

A quote lands low for a small set of reasons, and only some are good news:

Thin allowances — the classic. A $900 fixture allowance against competitors' $3,000 makes the total look sharp; the gap simply transfers to your selections invoice.
Unmentioned carried costs — disposal, site protection, permits. Each “not shown in quote” is real money relocated to later.
Vague scope — “electrical as required” and friends, the change-order seedbank. The low bidder isn't necessarily planning the change orders; but the thin paper guarantees them.
The tax basis — a tax-silent low number may not be low at all once everyone's on the same HST footing.
Desperation pricing — a contractor who needs the deposit to finish the last job. This is the version that ends with an unfinished site, and it's why a low price paired with pressure for a large fast deposit is the worst combination on the board.

The legitimate low bid — it exists

Sometimes the low quote is real: a lean owner-operator with no office overhead, a contractor filling a schedule gap, someone local to your street saving travel time. The test is simple and fair — ask: “Your number came in well under the others. Walk me through what explains the difference?” A legitimate low bidder answers instantly and specifically, because they know exactly why their costs are lower. An evasive or defensive answer tells you the difference is somewhere in the list above, still waiting for you to find it.

The math that matters: $18,000 quote + $4,500 of predictable change orders + $2,100 of allowance overage + your stress mid-project, vs. a $24,000 quote that already contained all of it.

The “expensive” quote was the cheap one — it just told you the real number up front, when you could still negotiate, compare, or walk away. The low quote tells you the real number when the walls are open and your options are gone.

That's the core of it: a complete quote and a cheap quote are answering different questions. The complete quote answers “what will this project cost?” The cheap quote answers “what will get me the signature?” Run every low number through the normalization method before the gravity gets you — the savings that survive that process are real, and the ones that don't were never savings at all.

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