Laneway Homes in Canada: When the Construction Costs Exceed the Rental Income

Tom built a 1,100-square-foot laneway home behind his Leslieville semi in 2024 for $480,000. He rents it for $3,200 a month. That's $38,400 a year. At a 5.5% HELOC rate on the full construction draw, he's paying roughly $26,400 a year in interest alone. Net before property tax: $12,000. After the reassessment bumped his annual tax bill by $4,800, he's clearing $7,200. On a $480,000 outlay, that's a 1.5% annual return. A GIC would have paid him triple.

Tom's situation is not unusual. It's what happens when the math doesn't account for how expensive these things actually are to build.

The gap between what you spend and what you collect

The basic arithmetic looks fine in theory. A two-bedroom laneway home in Toronto or Vancouver rents for $2,800 to $3,800 a month depending on finishes and location. Multiply that by 12, subtract operating costs, and you get a number that sounds like it justifies the investment. The problem is the denominator.

Construction costs in Ontario and BC are running $350 to $600 per square foot as of mid-2026. That's for the structure itself, not the site work. A 1,200-square-foot unit at $450 per square foot is $540,000 before you touch utilities. Connecting separate water, sewer, and electrical lines to the street adds $20,000 to $50,000 depending on the distance from the main to the back of your lot. Total project cost lands between $560,000 and $590,000 in the typical case.

At $3,500 a month in rent, that's $42,000 a year gross. Finance the build with a HELOC at 5.5%, and you're paying $30,800 to $32,450 in annual interest. Before property tax. Before insurance. Before repairs. The net income at that point is low single digits, sometimes negative.

Compare that to the alternative. If Tom had taken his $480,000 and bought a second condo in Etobicoke with a $200,000 down payment, he'd have rental income on a $280,000 mortgage, which at current rates and a $2,600 rent would still run negative most months, but the spread would be closer, and the condo appreciates independently. The laneway home's value is permanently tethered to the main house. You cannot sell it separately. You cannot refinance it separately. It is not a second asset. It's an improvement to the first one.

When the numbers work

There are conditions where laneway homes stop being a yield play and start being something else. First case: intergenerational housing. If you're building the unit for an aging parent or an adult child who would otherwise need you to co-sign a $2,400 rent somewhere else, the construction cost is replacing a different outflow. The implicit return is the rent you're not paying on their behalf.

Second case: you're planning to sell the main house within five to seven years, and you're in a market where buyers value the rental income or the optionality of a separate unit. Vancouver data suggests laneway homes add 10% to 20% to resale value in high-demand pockets, though that's a 2024 figure and depends heavily on whether the local market still has a rental shortage when you list. If resale lifts the main house by $150,000 and you spent $500,000 to build, you're still underwater by $350,000 unless the rental income covered the gap. It often doesn't.

Third case: rates fall and the financing cost compresses. At 3.5% instead of 5.5%, Tom's annual interest drops to $16,800. Net income jumps to $16,800 after tax. That's a 3.5% return, still worse than most index funds, but closer to plausible if you believe the unit adds resale value.

The rule is this: if you need the rental income to justify the build, the build probably doesn't justify itself. The math works when the unit solves a non-financial problem and the rental income is a secondary benefit. Otherwise you're paying $500,000 to earn $10,000 a year, and that's only if nothing breaks.