Most Sarnia-Lambton sellers spend about 5% to 7% of their sale price to sell. On a $480,000 home, close to the area’s September 2026 average, that’s roughly $25,000 to $33,000. The biggest costs are real estate commission plus 13% HST, legal fees, and any mortgage penalty, with moving and prep costs on top. In Ontario, sellers don’t pay land transfer tax. The buyer does.
The main costs of selling your Sarnia home
1. Real estate commission (plus HST)
This is the largest cost for most sellers. The commission in Ontario is negotiable, and no government sets it. A recent national survey put the average at about 4.3%, and 5% is the traditional benchmark. The listing brokerage usually shares part of it with the buyer’s brokerage.
Don’t forget 13% HST is charged on top of the commission.
On a $480,000 sale:
- At 4.3%: $20,640 commission + $2,683 HST = $23,323
- At 5%: $24,000 commission + $3,120 HST = $27,120
What you get for that commission matters more than the rate alone. Pricing strategy, marketing, photography, and negotiation all affect your final price, often by more than the commission difference.
2. Real estate lawyer fees
In Ontario, a real estate lawyer handles your closing. They review the Agreement of Purchase and Sale, prepare the closing documents, pay out your mortgage, and send you your proceeds.
Seller-side legal fees in Ontario commonly run about $1,500 to $2,500 once disbursements and HST are included. That usually covers paying out and discharging one mortgage. Ask for a written quote up front, and expect a rush fee if paperwork arrives late.
3. Mortgage penalty and discharge fee
This is the cost that catches the most Sarnia sellers off guard. If you sell before your mortgage term ends, your lender may charge a prepayment penalty:
- Variable-rate mortgage: usually about three months of interest. On a $250,000 balance at 4.5%, that’s roughly $2,800.
- Fixed-rate mortgage: often the greater of three months’ interest or the interest rate differential (IRD), which can be much higher. On some big-bank fixed mortgages, the IRD runs into five figures.
Lenders also charge a discharge fee, typically a few hundred dollars.
Before you list, call your lender and ask for a written payout statement with the penalty. If you’re buying again, ask whether you can port your mortgage to the new home. That can cut or eliminate the penalty.
4. Closing adjustments
Your lawyer will balance out costs you’ve prepaid or still owe as of closing day, like property taxes and some utilities. If you’ve paid your full-year property taxes, you may get money back. If you’re behind, it comes off your proceeds. It’s usually a small number either way, but it’s good to know it’s coming.
The costs you control
These depend on your home and your plans, so they vary a lot from seller to seller:
- Repairs and prep. Fixing what a buyer’s home inspector would flag, a fresh coat of paint, or a deep clean. Many sellers spend a few hundred to a few thousand dollars.
- Staging and photos. Professional photos are worth it in a market where buyers scroll past dozens of listings first. Great listing photos can raise a buyer’s sense of your home’s value before they ever book a showing.
- Pre-listing inspection. Optional, and usually a few hundred dollars. It helps you spot problems early instead of renegotiating after an offer.
- Moving. Local movers, a truck, packing supplies, and maybe storage. Budget a few thousand dollars for a typical local move.
- Carrying costs. Every month on the market means another mortgage payment, tax bill, utilities, and insurance.
That last one is worth a closer look right now. Sarnia-Lambton had 722 active listings and 5.6 months of inventory in September 2026, and single-detached homes took a median of 29.5 days to sell in the third quarter, up from 22 days a year earlier. An overpriced home that sits for an extra two or three months can cost you more in carrying costs and price reductions than a sharper list price ever would.
Costs Sarnia sellers usually don’t pay
- Land transfer tax. In Ontario, the buyer pays it, not the seller.
- Capital gains tax on your home. If the house is your principal residence, the gain is generally tax-free. Rental and investment properties are different, so talk to your accountant.
- HST on the sale price of a resale home. It applies to commission and legal fees, not to the price of a used home.
A sample Sarnia net sheet
Here’s what selling a $480,000 home might look like, assuming a variable-rate mortgage and a local move:
- Commission at 4.3% + HST: $23,323
- Legal fees and disbursements: about $2,000
- Mortgage discharge fee: about $300
- Mortgage penalty (variable, $250,000 balance): about $2,800
- Moving: about $2,000
Estimated total: about $30,400, or roughly 6.3% of the sale price.
From the remaining $449,600, your lawyer pays off your mortgage balance, and the rest is yours. With a fixed-rate mortgage, a higher commission, or prep work, your number could be higher. With no mortgage, it could be much lower.
Every home is different, and the only way to know your real number is to start with an accurate sale price for your home in today’s market. That’s exactly the first thing I work out with every seller before we talk about listing.
The bottom line
Selling a home in Sarnia-Lambton usually costs about 5% to 7% of the price, and the mortgage penalty is the number most people forget to check. Call your lender, get a legal quote, and know your costs before you list.
The other half of your net sheet is the sale price itself. Curious what your home would sell for in today’s Sarnia-Lambton market? Get a free, no-pressure home evaluation from Rob. You’ll get a realistic price based on recent local sales, and a clear picture of what you’d walk away with.
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