The short version
- A lender bases the mortgage amount on the lesser of the purchase price or the appraised value — not the price you agreed to pay, if the two don't match.
- A $30,000 shortfall between price and appraisal generally means finding close to $30,000 more in cash to keep the same loan-to-value, not a smaller mortgage at the same down payment.
- If the only issue is the number, the deal often survives — the buyer covers the gap, renegotiates the price, or walks away using a financing condition.
- A pre-approval doesn't protect you here. It's based on your qualifying, not the specific property, so it says nothing about what that property will actually appraise for.
- A financing condition in your offer is what gives you room to renegotiate or exit if the appraisal comes back low — which is why it matters more in a market where conditions are being waived.
The rule that decides everything else
An accepted offer and an appraisal are two different numbers, and lenders only ever finance against the lower of the two. As Canadian Mortgage Trends puts it, when it comes to calculating a loan amount, lenders use the lesser of the appraised value or the purchase price — not the price on the agreement of purchase and sale.
Most of the time that distinction doesn't matter, because the two numbers land close together. It only becomes a live issue when an appraiser's opinion of value comes in meaningfully below what a buyer agreed to pay — which can happen in a fast-moving market, on a unique property, or wherever comparable recent sales are thin.
What the shortfall actually costs, with a real example
Canadian Mortgage Trends walks through a concrete illustration worth borrowing directly: a buyer agrees to purchase a property for $1.1 million with 20% down, or $220,000. If the appraisal comes back at $1 million instead, the lender will only advance 80% of that appraised figure — $800,000 — rather than 80% of the agreed price. The buyer is left needing to find an additional $80,000 in cash to bridge the gap and still close at the original price.
The pattern scales down the same way at any price point: the lender isn't offering a smaller mortgage at your existing down payment, it's holding your loan-to-value ratio fixed against the lower of the two numbers — which means the entire difference between price and appraisal typically has to come from somewhere else, usually the buyer's own funds.
What a buyer can actually do about it
A low appraisal is a problem, not automatically a dead deal. Canadian Mortgage Trends notes that when the only issue with an appraisal is the price — no structural concerns, no major red flags in the report — a buyer who can come up with the shortfall in cash can generally still close as planned.
- Cover the gap. If you have the funds available beyond your planned down payment, this is the most direct route — close at the agreed price, using more of your own cash.
- Renegotiate the price. If your offer included a financing condition, a low appraisal is grounds to go back to the seller and ask for a price closer to what the appraisal supports.
- Walk away. A properly drafted financing condition gives you the right to exit the agreement if you can't secure financing at the appraised value — without losing your deposit.
- Request a second opinion, in limited cases. An appraisal review isn't guaranteed to change the outcome, but it's worth asking your broker whether it's warranted if the figure seems clearly out of step with recent comparable sales.
Which of these makes sense depends entirely on how your offer was written. A financing condition is what actually creates the room to renegotiate or exit — without one, a low appraisal can leave a buyer with far fewer options.
Why a pre-approval doesn't protect you here
It's a common assumption that a pre-approval removes this risk, and it doesn't. A pre-approval confirms what you personally qualify to borrow, based on your income, debts and credit — it says nothing about a specific property, because at the time it's issued, there usually isn't one yet. We've written separately about what a pre-approval actually is and where its limits sit.
The appraisal only happens once you have an accepted offer on an actual property, which is exactly why it's a separate risk from qualifying — and why the financing condition in your offer, not the pre-approval letter, is what actually protects you if the two numbers don't line up.
When this risk matters most
A low appraisal is more likely on a property that's genuinely hard to compare — a unique renovation, a rural property with few nearby sales, or a home that sold in a bidding situation where the accepted price ran ahead of recent comparables in the area. It's also more of a live risk in any market where buyers are waiving conditions to compete, since a waived financing condition removes the safety net this whole scenario depends on.
None of that means avoiding a competitive offer altogether — it means understanding, before you write one, exactly what protection you're giving up if you drop the financing condition to make your offer stronger.
Nearly thirty years in Canadian financial services, based in Waterloo Region and working across Ontario. Most people are handed a product — you deserve a plan.
General information only. Appraisal outcomes, lending value and financing conditions depend on the specific property, lender and offer; confirm your own situation with your broker or lawyer before relying on it. Illustrative only, subject to full qualification, lender approval and final terms.
Sources: Canadian Mortgage Trends — What Happens When Appraisal Values Come Up Short?