I decide if a Hamilton duplex is worth buying with four questions. Can I finance it well? Does the zoning let it grow? Are the tenants an asset or a risk? Do I have the team to run it? I call that the leverage test. I've used it on every deal since I bought my first investment property in Oshawa in 2012. A good price matters, but a deal that fails these four tests isn't cheap. It's just early to show its problems.
Here's how I run each test on the kind of property I get asked about most: an older Hamilton house split into two units. If you want the background on how I work, it's on my page about how I invest and sell.
Test one: financing, before I fall in love
Most people start with the house. I start with the lender.
A duplex can carry two incomes. That helps you qualify. But lenders don't all count rent the same way. Some count part of it. Some count more. Two buyers can look at the same Hamilton duplex and qualify for very different amounts.
So before I walk through a property, I want to know three things. What will the lender count? What will the payment be? What's left each month after real costs?
That last one is where people fool themselves. They leave out vacancy, repairs and management. Then the deal looks great on paper and bleeds in real life. We wrote down exactly how we do the math in our underwriting standard for NOI, cap rate and cash flow. Use it. It's the same sheet my team uses.
If the numbers only work with zero vacancy and zero repairs, the numbers don't work.
Test two: zoning, the part people skip
This is where Hamilton gets interesting.
In 2022, Ontario's Bill 23 made it legal to have up to three units on most residential lots that have city services. Hamilton has gone further on many lots. That means the duplex you're looking at might be a triplex later. Or a fourplex. It might also be stuck at two, because of lot size, parking or servicing.
I check the zoning on the exact address. Not the street. Not the neighbourhood. The address.
Why does it matter so much? Because zoning is free leverage. You don't pay extra for a lot that can hold another unit if the seller hasn't priced it in. When it can grow, that's room to add value. When it can't, I pay for what's there today and nothing more.
To see what other buildings ask per unit, look at our Hamilton duplex, triplex and fourplex report. It breaks prices down by building size and by neighbourhood.
Test three: tenants come with the house
In Ontario, when you buy a tenanted property, the leases come with it. You don't get to start fresh.
So I treat the tenants like part of the building. I want to see the leases. I want to know what each unit pays and how that compares to the market. I want to know if anyone is behind.
A long-term tenant paying well under market isn't automatically bad. They may be quiet, stable and great to have. But you have to price that in. If the plan only works once that unit turns over, you're buying a plan that depends on someone else's choice.
This is one of the most common mistakes I see. People buy the rent they hope to get. I buy the rent that's in the lease.
Test four: the team, or who picks up the phone
A duplex is a small business. Someone has to handle the furnace at 2 a.m. Someone has to screen the next tenant. Someone has to know the rules at the Landlord and Tenant Board.
That's why I built Found Spaces Property Management next to the sales side. I learned early that the deal is only as good as the people running it after closing.
You don't need a big team. You do need a few names. A lender who knows rental files. A contractor who answers. A realtor who reads zoning. A manager, or a clear plan to do it yourself.
If I can't name those people, I'm not ready to buy. Even if the price is right.
How I score it
I don't use a fancy formula. I ask if each test makes the deal stronger, weaker or neutral.
Financing that works with real costs? Stronger. Zoning room to add a unit? Stronger. Below-market tenants with no plan? Weaker. No team lined up? Weaker.
Two strong tests can carry a deal. Two weak ones usually sink it. That's my rule, and some people will push back on it. Fine. I'd rather miss a deal than own one that wears me down.
More of what we watch in this city is on our Hamilton investment properties page.
Questions people ask
Does the leverage test work outside Hamilton?
Yes, but the weight shifts. In Niagara, much of the farmland sits inside the provincial Greenbelt, so zoning often limits what you can build. In Burlington's luxury market, financing and how the home is positioned tend to matter more than tenants.
Are newer rental units in Hamilton under rent control?
In Ontario, units first lived in after November 15, 2018 are exempt from the yearly rent increase guideline. Older units are not. That can change the long-term math on two duplexes that look the same today.
How do I check what a Hamilton property is zoned for?
The City of Hamilton has an online zoning map you can search by address. It tells you the zone, but not every limit, like parking or servicing. For anything you plan to build, call the city's planning desk before you firm up an offer.
Want me to run the test on a property you're watching?
Send me the address. I'll tell you how it scores on financing, zoning, tenants and team, and where I think the risk is. Book a plain conversation with me and my team. No pressure. Just the same questions I ask before I buy.