Ten costly mistakes home sellers make, and how to avoid them
The mistakes I see most often when people sell in Brampton, Mississauga and across the GTA. Why each one costs money, and what to do instead.
The short answer: the costliest seller mistakes are overpricing at launch, listing before the home is ready and judging offers on price alone. Forgetting the mortgage penalty and selling costs comes close behind. Each one is avoidable with evidence: comparable sales, a preparation plan, a side-by-side offer comparison, and a net-proceeds estimate before you list.
The ten mistakes
1. Pricing from hope, not evidence
Why it costs you: Pricing to what you paid, owe or need for the next home. Buyers only compare your home with other homes.
What to do instead: Ask for a written CMA with every comparable sale and adjustment shown. Pricing your home.
2. Choosing the agent who quotes the highest price
Why it costs you: A high quote can win a listing and then lead to price cuts.
What to do instead: Compare agents on their evidence, their plan and their negotiation, not the number they say first. How to choose an agent.
3. Listing before the home is ready
Why it costs you: In my experience, the first weeks bring the most attention. Weak photos or visible repairs waste them.
What to do instead: Finish repairs, declutter and stage before photo day. Preparing your home.

4. Judging offers on price alone
Why it costs you: A higher price with weak conditions or a small deposit can fail to close.
What to do instead: Compare price, deposit, conditions, financing and dates together. Comparing offers.
5. Forgetting the mortgage penalty
Why it costs you: Breaking a closed mortgage early can trigger an interest rate differential penalty, which can be far larger than three months’ interest.
What to do instead: Get a payout statement from your lender before you set the price. Selling costs.
Avoid the first mistake: start from real numbers.
What’s my home worth?6. Signing a listing agreement you have not read
Why it costs you: Term, commission, holdover and termination terms all bind you.
What to do instead: Read the expiry date, commission terms and any termination terms before you sign. Listing agreements.
7. Hiding defects or unpermitted work
Why it costs you: Some facts must be disclosed. Buyers’ inspectors and lawyers ask.
What to do instead: Gather permits, disclose honestly, and ask your lawyer what is required. Disclosure and documents.
8. Mismatched closing dates
Why it costs you: Selling and buying with dates that do not line up can mean two mortgages or a hotel.
What to do instead: Plan the order of your sale and purchase before you list. Upsizing.
9. Ignoring the market’s reply
Why it costs you: Weeks of showings without offers is feedback about price or presentation.
What to do instead: Review showings, feedback and new competition every week, and act on the evidence. Reading the market.
10. Treating tenants as an afterthought
Why it costs you: Tenancies continue after a sale unless ended under the Residential Tenancies Act.
What to do instead: Decide early whether you sell with the tenant or with vacant possession. Selling a tenanted home.
Mistakes at a glance
| Stage | Common mistake | Better approach |
|---|---|---|
| Choosing an agent | Picking the highest price quote | Ask for the comparable sales and the marketing plan |
| Signing | Not reading term, commission and termination terms | Read every clause. No commission rate is fixed by law, and 13% HST is added |
| Pricing | Pricing to what you need | Price from recent comparable sales |
| Preparing | Major renovations before listing | Repairs, cleaning, decluttering and staging |
| Marketing | Phone photos and vague descriptions | Professional photos, floor plans and accurate details |
| Showings | Being home during visits | Leave, and let buyers take their time |
| Offers | Price-only decisions | Compare every term, side by side |
| Closing | Vague inclusions and late paperwork | Clear inclusions, a lawyer hired early, deadlines tracked |
Mistakes in special situations
- Estate sales: listing before confirming who can sign, or before knowing whether probate is needed. See selling an estate home.
- Separation: one spouse listing a matrimonial home without the other’s consent. See selling during separation.
- Arrears: waiting until the lender’s notice period runs out. See facing power of sale.
- Downsizing: deciding under time pressure after a health change. See downsizing.
Pre-listing checklist
- A written CMA with comparable sales and adjustments
- Your lender’s payout statement, including any penalty
- A net-proceeds estimate including commission, 13% HST and legal fees
- A lawyer chosen and contacted
- Repairs done, home decluttered, photos booked
- Permits, warranties and documents gathered
- A plan for the order of your sale and next purchase
- Your offer approach and disclosure choice decided
For the complete process, read the six-step selling plan.
Questions sellers ask
What is the biggest mistake home sellers make?
Overpricing at launch. In my experience, buyer attention is strongest in the first weeks, and a home priced above the evidence spends that time helping competing homes sell. Price from recent comparable sales, not from what you need or what a neighbour hoped for.
Is it a mistake to buy before I sell?
Not always, but it carries risk. If your home sells for less or later than planned, you may carry two mortgages or need bridge financing. In a slower market, selling first is usually the safer order.
Should I accept the first offer?
Judge it on its merits, not its timing. An early strong offer can be the best one you see. Compare it with the comparable sales and decide whether waiting is likely to bring something better.
Can I sell without disclosing problems?
Some known defects must be disclosed, and hiding them can lead to a legal dispute after closing. Under Ontario’s rules, your agent must disclose to interested buyers any fact you are legally required to disclose that they know. Ask a real estate lawyer what applies.
Do I need a lawyer to sell my home in Ontario?
Your lawyer handles the transfer, pays off your mortgage from the proceeds and releases the funds to you. Hire one before you list, so they can answer questions about title, disclosure or offers quickly.
Will my principal residence sale be taxed?
Usually not, if it was your principal residence for every year you owned it, but you must still report the sale on your tax return. Homes owned less than 365 days can be caught by the flipping rule. Ask an accountant.
How do I know if my agent is pricing my home correctly?
Ask for the comparable sales and the adjustments in writing. A good agent explains every number and shows you the competition, not just a single figure.
Sources
- Ontario e-Laws: O. Reg. 567/05 under the Trust in Real Estate Services Act, 2002 (agreements, disclosure, competing offers)
- Financial Consumer Agency of Canada: mortgage prepayment penalties
- CRA: principal residence and other real estate
- CRA: residential property flipping rule
- CRA: GST/HST rates by province
- Ontario e-Laws: Residential Tenancies Act, 2006
Start with the number that prevents mistake one
Get an instant estimate, then I will check it against the comparable sales and build a plan that avoids the other nine.