Most people who lose money on a rental property did not buy a bad building. They bought a reasonable building on optimistic numbers.
The building is rarely the problem. The spreadsheet is.
This is how to screen an investment property properly, and what is specific about doing it here.
The direct answer
A rental works when the rent covers every cost, not just the mortgage, with margin left for the things that will go wrong. Screen on complete numbers, verify the ones you can, and be conservative about the ones you cannot.
If a deal only works when you assume no vacancy, no repairs, and no management, it does not work.
The numbers that actually decide it
Here is the full cost picture people leave incomplete.
Mortgage payment. Principal and interest at the rate you will actually get, not today's advertised special.
Property tax. The real annual figure for that specific property.
Insurance. Landlord coverage costs more than homeowner coverage. Get a quote rather than estimating, particularly on an older building.
Utilities you pay. Depends entirely on how the building is set up and metered. Confirm it.
Maintenance. It is not zero and it is not optional. Something breaks every year.
Capital reserve. Roofs, furnaces, and windows do not fail gradually. Set money aside monthly for the failures that arrive all at once.
Vacancy. Assume the unit will be empty for some period between tenants. A model with zero vacancy is a fantasy, not a forecast.
Property management, if you use it. And even if you plan to self-manage, cost it, because your time has value and your plans may change.
What is left after all of that is your cash flow. If you have not subtracted every one of those, you have not calculated cash flow, you have calculated a number that feels good.
The investment property analyzer I built runs all of this properly, including the refinance side. It costs nothing, nothing is saved on my end, and it will tell you when a deal does not work, which is the more valuable answer.
The date that changes your whole model
This is the variable new investors miss most often, and it can be worth more than the purchase price difference between two properties.
Ontario has a two-tiered rent control system, and the dividing line is 15 November 2018.
Units first occupied for residential purposes before 15 November 2018 are subject to the annual provincial rent increase guideline. You can raise rent by that percentage and no more without approval from the Landlord and Tenant Board. The guideline is capped by law at 2.5% and is usually well under it. For 2026 it is 2.1%.
Units first occupied on or after 15 November 2018 are generally exempt from the guideline. Rent can be increased by any amount, subject to still giving proper written notice and only once every twelve months.
What that means in practice: a 1970s bungalow and a legally created new unit have genuinely different long-term return profiles, even at identical rent today. On the older property your rent grows at roughly 2% a year while your property tax, insurance, and maintenance grow at whatever inflation actually does. That gap compounds against you over a decade, and it is the quiet reason some older rentals stop working years after purchase.
Two cautions:
The date is first residential occupancy, not the build date and not when you bought it. Confirm it rather than assuming from the age of the building.
A newly created unit can qualify even in an old building, which is part of why legal secondary units get the attention they do. Whether a specific unit qualifies is a question for a lawyer or paralegal who does this work, and it is worth asking before you rely on it in your model.
Financing an investment property
Different from buying a home, in ways that surprise first-time investors.
Expect at least 20% down. Default insurance generally is not available on a property you will not occupy, so the low down payment options that exist for homebuyers do not apply. Some owner-occupied structures, such as living in one unit of a small multi-unit building, can change this. Ask a broker who actually does investment lending.
Rental income counts, but not fully. Lenders apply their own treatment to projected rent, and different lenders treat it differently. Do not assume the rent simply offsets the payment in their calculation.
Rates and terms differ from owner-occupied lending.
Closing costs still apply, and land transfer tax has no first-time buyer rebate here. Budget the full closing costs in cash.
Get pre-approved specifically for an investment purchase before you shop. An owner-occupied pre-approval tells you very little about what you can do here.
Burlington and Hamilton behave differently
Worth being direct about this, because investors ask constantly.
The two markets have historically had different profiles. Hamilton has generally offered lower entry prices and stronger rent relative to purchase price, which is why so much investor attention went there. Burlington tends to be the steadier, lower-yield market with a different tenant profile.
Neither is universally correct. A cash flow buyer and a long-hold quality buyer should reach different conclusions from the same data. What I would push back on is deciding by reputation rather than by running both through the same complete model.
My comparison of the two markets is in Burlington versus Hamilton, written for buyers but the underlying differences apply.
Hamilton now licenses small rentals, and Burlington does not
This is a regulatory difference that did not exist a couple of years ago, and it is exactly the kind of thing an investor should hear from their agent rather than from a bylaw officer.
Hamilton ran a rental housing licensing pilot and then made it permanent from 1 January 2026, covering Wards 1, 8, and parts of Ward 14. If you own a rental in those areas and the property is a detached home, a townhouse, or a building with five or fewer self-contained units, you need a licence.
That means an application and fee, city inspections, and evidence that the property meets the required standards. Operating without one carries fines of up to $1,000 per day, which is not a rounding error on a small rental.
Burlington does not currently have an equivalent requirement.
None of this makes Hamilton a bad buy. It is a cost and an administrative burden to put in your model rather than discover afterwards, and the city has signalled it may look at expanding the programme to other wards. So check the current rules and the specific ward before you commit, because this is a moving file.
Tenancy rules will decide your outcome
This is where new landlords get hurt, and it deserves plain language.
In Ontario, a residential tenancy generally continues with the property when it sells. You are buying the tenancy along with the building. The rules about rent increases, notice, and ending a tenancy are strict, procedural, and enforced, and good intentions are not a defence.
Practical consequences:
If your plan needs the unit vacant, understand how that can and cannot legally happen. This is where new investors get into genuine trouble, so it is worth being precise.
Putting a vacant possession clause in your offer does not, by itself, empty the unit. A tenancy can only end in specific ways, and the two that matter here are very different.
The N12, for a purchaser's own use. This is available only when you, or a defined member of your immediate family, genuinely intend to move into the unit as a primary residence for at least a year. It is generally limited to properties with three or fewer residential units, and it requires compensation to the tenant. If you are buying purely to re-rent at market rent or to flip, an N12 is not available to you. Serving one anyway is not a grey area. It is a bad faith eviction, and the penalties are real.
The N11, an agreement to end the tenancy. This is a genuine mutual agreement between the existing landlord and the tenant, and it is the realistic route to a vacant unit for a pure rental purchase. In practice it usually means the seller negotiating with the tenant, often with compensation, before closing. The tenant does not have to agree, and a signed N11 before closing is the only version of this you should rely on.
The practical instruction: if your plan depends on vacancy, make it the seller's obligation to deliver a signed agreement before closing, and have your lawyer confirm the wording. Do not buy on the assumption that you will sort it out afterwards, because frequently you cannot.
Verify the actual rent and the actual tenancy terms. Ask for the lease, the rent roll, and evidence of what is actually being paid. A pro forma rent is a hope. Verify what exists.
Understand what you are inheriting. A long-standing tenant may be paying well under market rent, and that is legally their rate, not an opportunity you can simply correct.
I wrote about the mechanics of buying and selling a tenanted property in more detail, and I would read that before making an offer on anything occupied.
Inspect it like the business asset it is
Do not skip the inspection to look competitive. You are buying a machine that has to produce income, and its expensive parts are the roof, furnace, electrical, plumbing, and windows.
Older buildings deserve particular attention to wiring. Certain older wiring types affect whether insurers will write a policy, and no insurance means no mortgage. That is a chain that can end a deal late, and it is entirely findable early.
If the property is a condo, the status certificate is your inspection of the corporation, and the reserve fund is the number that matters most. A special assessment lands on you regardless of what your spreadsheet said.
About BRRRR
BRRRR stands for buy, renovate, rent, refinance, repeat. It is investor shorthand for a strategy, not a product, and you will hear it constantly once you start looking.
The strategy is sound in principle: buy something under-improved, renovate to force appraised value up, rent it, refinance to pull your capital back out, repeat.
Where it fails in practice is almost always the refinance. The renovation has to genuinely move the appraised value, not just the way the place looks, and the appraisal has to support your projection. If it comes in short, your capital stays trapped and the next purchase does not happen.
One trap specific to renovating a tenanted property. If the work genuinely requires the unit to be empty, that is an N13, and an N13 is not a way to clear a building cheaply. It requires compensation to the tenant, and it gives the tenant a right of first refusal: they can choose to move back in once the work is finished, at their previous rent. If your refinance projection assumed a renovated unit at market rent, that assumption can evaporate, and with it the whole point of the exercise. Know this before you plan a renovation around an occupied unit, not after.
So model it before you buy, with a conservative after-repair value and a realistic renovation budget including the overrun that always happens. Again, the investment property analyzer does this, and it is free.
The mistakes I see most
- Comparing rent to the mortgage payment and calling the difference profit
- Assuming zero vacancy and zero maintenance
- Trusting pro forma rents instead of verifying actual leases
- Assuming a tenant can be removed because the property changed hands
- Skipping the inspection on an older building to win a competitive situation
- Buying on appreciation alone. Appreciation is a hope. Cash flow is a plan.
The takeaway
Model every cost, not the convenient ones. Get financing sorted specifically for an investment purchase before you shop. Verify tenancies rather than assuming them. Inspect properly. Be conservative on the numbers you cannot verify, especially an after-repair value.
If you are looking at investment property across Burlington, Hamilton, or Niagara and want someone who will run the numbers honestly and tell you when a deal does not work, that is the part of this I find genuinely interesting. Start with the investment property analyzer and call me with what it tells you.