Chomedey, Laval: Price per Unit Falls as Buildings Get Bigger

In Chomedey, a triplex costs more than a duplex, but each of its units costs less. Measured per unit, the price of an income property in this part of Laval goes down as the building gets bigger. Our overview of the Laval market is in our Laval real estate market article; this one isolates a single mechanism: the price paid per door depending on building size.

180 sales over a six-month window

The figures come from CourtiConnect's comparable sales database for the Chomedey area, rentals excluded. The sales on file run from October 6, 2025 to April 10, 2026: 180 sales, 58 of them income properties. Only aggregates are published; no individual sale is shown.

Price per unit is calculated sale by sale: the sale price divided by the building's number of units. The median for each type is then taken, meaning the value that splits the sales into two halves.

Duplex versus triplex: a $64,500 gap per unit

• Duplex: 20 sales; median building price $774,000; median price per unit $387,000.
• Triplex: 26 sales; median building price $967,500; median price per unit $322,500.

At the median, a triplex sells for $193,500 more than a duplex, for one more unit. Each triplex unit therefore costs $64,500 less than a duplex unit, or about one sixth less.

The two distributions overlap widely. For the middle half of sales, a duplex unit sits between $333,500 and $413,125, a triplex unit between $288,333 and $402,500. The gap between medians is clear, but a given duplex can easily cost less per unit than a given triplex.

4 and 5 units: the same slope, as an indication only

• 4 units: 4 sales; median price per unit $293,750.
• 5 units: 4 sales; median price per unit $257,000.

These two medians extend the slope seen between duplex and triplex, but each rests on only four sales. At that size, one sale more or less can move the median by tens of thousands of dollars. They show a direction; they are not a price reference. Four sales of larger buildings, with 8 and 11 units, are also on file for the period; there are too few of them to present.

What may explain the slope

The database measures the gap; it does not measure its cause. What follows is an interpretation, not a measurement. Part of a building's price does not depend on its number of units: the land, the roof, the foundation, the water service. The more units there are, the more doors those costs are spread over.

The buyer changes too. A duplex attracts households who plan to live in one unit and rent the other; they are partly paying for their own home. A larger building attracts more buyers who work from the income, and their price per door follows the rents rather than the wish to live there.

What price per unit does not tell you

It says nothing about unit size. A duplex unit may be larger than a triplex unit. The database carries a living area for 49 of these 58 buildings, but what it measures for a multi-unit building is not established here, and this article does not use it to compare units of equal size. It says nothing about rents either, which are not in the database.

Nor does it say anything about building age: in Chomedey, the duplexes sold are older than the triplexes at the median, with a median construction year of 1961 against 1986.5. That age gap adds to the size difference, and this article does not claim to separate the two.

Finally, the window covers six months, from October to April. It describes one moment in the market, not a trend.

What sellers and buyers can take from it

For a duplex seller, the high price per unit reflects demand that includes owner-occupant buyers: that is the clientele the marketing should target. For a seller of a triplex or a larger building, the useful comparison is with buildings of the same size, not with the duplex next door.

For a buyer working from income, a triplex's lower price per unit is only an advantage if the rents follow. Either way, these medians place a building; they do not replace an analysis of its income or a comparison with truly similar sales.