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The buyer mistakes that cost the most

Nineteen mistakes I see Ontario buyers make, grouped by stage: what each one costs and what to do instead.

Sandeep Pawar on a residential street in Brampton

The short answer: the costliest buyer mistakes are treating a pre-approval as final, budgeting nothing for closing costs, and letting a bidding war set the price. Close behind: waiving an inspection or status certificate review without doing the work, and new debt before closing. Each one is avoidable with a few hours of preparation before you offer.

By Sandeep Pawar, Broker, ABR and RENE. Last reviewed 27 October 2026. General information, not legal or mortgage advice.

The big five

  1. Going firm on a pre-approval

    The lender approves you first and the property second. Until both are done, keep your financing condition.

  2. Forgetting closing costs

    Land transfer tax, legal fees, title insurance and adjustments are paid on top of the down payment.

  3. Paying the bidding war price

    The number of offers does not change what the home is worth. Comparable sales do.

  4. Waiving checks you did not do

    An inspection or status certificate review you skipped is a risk you bought.

  5. Changing your finances before closing

    A car loan or job change can undo a mortgage approval.

For an uninsured mortgage, federally regulated lenders qualify you at the greater of your contract rate plus 2% or 5.25%. Your real limit can be lower than you expect.

Money mistakes

MistakeWhat it costsDo this instead
Treating a pre-approval as a final approvalThe lender declines the property or appraises it low after you go firm.Keep a financing condition until the lender approves this home.
Budgeting only for the down paymentA cash shortfall days before closing.Budget 1.5% to 4% for closing costs. Calculate yours.
Spending the whole approvalNo room for property tax, maintenance or rate changes.Set your budget from the monthly cost you can carry, not the maximum loan.
New debt or a job change before closingThe lender can withdraw or reduce the mortgage.No new credit, no job changes, no large unexplained deposits until after closing.
Missing first-time buyer programsPaying tax or interest you did not need to.Check the FHSA, the Home Buyers’ Plan and the land transfer tax refunds. First-time buyer guide.

Offer mistakes

MistakeWhat it costsDo this instead
Letting a bidding war set the pricePaying well above what comparable homes sold for.Set a walk-away price from comparables before offer night. Multiple offers.
Judging an offer on price aloneLosing to a lower offer with better terms, or winning with terms that hurt you.Use deposit, closing date and certainty as levers.
Revealing your motivationThe other side learns how far you will go.Let your representative do the talking.
Vague included itemsArguments about appliances and fixtures on closing day.Name every included item in the offer.

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Due diligence mistakes

MistakeWhat it costsDo this instead
Waiving the inspection without inspectingOwning a roof, foundation or water problem you did not see.Inspect before the offer or keep the condition. What to check.
Skipping the status certificate on a condoA special assessment or thin reserve fund after you buy.Make the offer conditional on your lawyer’s review of it.
Assuming a basement unit is legalRent you cannot collect, insurance problems, or orders to remove it.Check registration and permits. Legal basement guide.
Ignoring rental equipmentTaking over a water heater or furnace contract you did not know about.Ask what is rented and have the offer say so.

Contract mistakes

MistakeWhat it costsDo this instead
Signing a buyer agreement without reading itA long term, a wide area or a holdover you did not expect.Read every clause first. The agreement explained.
Agreeing to multiple representation casuallyYour agent can no longer advise you on price or terms.Understand what you give up, and ask about a referral.
Signing a builder’s agreement without reviewUncapped closing adjustments, long delays, assignment limits.Use the 10-day condo cooling-off for a legal review. Pre-construction guide.

Closing mistakes

MistakeWhat it costsDo this instead
Hiring the lawyer lateA rushed title search and a late closing.Hire your lawyer as soon as the offer is accepted.
Sending funds on closing dayKeys delayed or the closing missed.Send funds a day or two early. Closing checklist.
Booking movers for the morningPaying movers to wait for keys.Book for the afternoon or the next day.

Self-check before you sign an offer

  • I know the fair price range from recent sales, not the list price
  • I have a walk-away number, written down
  • I have cash for closing costs and an appraisal gap
  • The home has been inspected, or my offer has an inspection condition
  • For a condo, my lawyer will review the status certificate
  • Any basement unit’s legal status has been checked
  • I have read every schedule and every included item
  • I will not change jobs or take on debt before closing

The full process is in buying a home in Ontario, step by step.

Questions buyers ask

What is the most expensive mistake first-time buyers make?

Going firm on a home they have not properly checked: no inspection, no full lender approval, or no status certificate review on a condo. Once an offer is firm, every problem and every shortfall is yours.

Is a mortgage pre-approval enough to waive my financing condition?

No. A pre-approval is about you; the lender still has to approve the specific property, often with an appraisal. RECO notes that pre-qualifying does not remove the need for a financing condition.

How much should I budget for closing costs?

The Financial Consumer Agency of Canada suggests 1.5% to 4% of the purchase price, on top of your down payment. Land transfer tax is one of those costs, and buyers in Toronto pay a municipal land transfer tax as well.

Can I change jobs or buy a car before closing?

Avoid it. Your lender can review your file again before advancing the mortgage. A new loan or a change in employment can put the approval at risk.

Is it a mistake to buy a home with a basement apartment?

Not by itself. The mistake is assuming it is legal, or counting on rent you cannot legally collect. Check its status with the city and your lawyer before you go firm.

Should I always offer under asking?

No. Offer from evidence. Some homes are priced high and sit; others are priced low to draw multiple offers. Comparable sales tell you which one you are looking at.

Do I really need my own agent if the listing agent is friendly?

The listing agent works for the seller. If you are not their client, they cannot give you advice. If you are, and they also act for the seller, they cannot advise you on price or terms.

Sources

Avoid the expensive lessons

Tell me where you are in your search. I will tell you what I would check next and what I would not do.