Duplex, triplex, quadruplex · Sainte-Thérèse · 2016-2026
The median price of a duplex, a triplex and a quadruplex in Sainte-Thérèse every year since 2016, with the number of sales, the price per unit, what the extra unit costs, and the single-family house alongside. Centris sales, nothing estimated.
In Sainte-Thérèse, the median duplex sold for $677,000 in 2026 (Jan. to Sept.) (22 sales), against $225,000 in 2016 and $347,000 in 2021: +201% in ten years, or $338,500 per unit. The median triplex is worth $882,500 ($294,167 per unit, +118% since 2016); too few quadruplexes sell in Sainte-Thérèse to publish a reliable median (33 sales in ten years). The third unit costs $205,500 more than the duplex (+30%). The median single-family house, for its part, is worth $650,000: the duplex is 4% more expensive than the house. It is one of the most expensive duplexes among the 23 cities tracked (median $500,000). Source: Centris (Matrix), compiled October 8, 2026.
The short answer
In Sainte-Thérèse, the median duplex sold for $677,000 in 2026 (Jan. to Sept.) (22 sales), against $225,000 in 2016 and $347,000 in 2021: +201% in ten years, or $338,500 per unit. The median triplex is worth $882,500 ($294,167 per unit, +118% since 2016); too few quadruplexes sell in Sainte-Thérèse to publish a reliable median (33 sales in ten years). The third unit costs $205,500 more than the duplex (+30%). The median single-family house, for its part, is worth $650,000: the duplex is 4% more expensive than the house. It is one of the most expensive duplexes among the 23 cities tracked (median $500,000).
Median price by type and by year
| Year | Median duplex (sales) | Median triplex (sales) | Median quadruplex (sales) | Median house |
|---|---|---|---|---|
| 2016 | $225,000 (15) | $405,500 (24) | n/a (0) | $258,125 |
| 2017 | $237,000 (11) | $445,000 (27) | n/a (2) | $294,850 |
| 2018 | $235,500 (20) | $450,000 (21) | n/a (4) | $287,000 |
| 2019 | $294,500 (16) | $485,000 (22) | n/a (1) | $320,000 |
| 2020 | $335,000 (25) | $526,000 (32) | n/a (4) | $352,000 |
| 2021 | $347,000 (35) | $615,000 (71) | n/a (13) | $452,000 |
| 2022 | $449,900 (23) | $670,000 (21) | n/a (1) | $517,500 |
| 2023 | $514,500 (16) | $751,000 (21) | n/a (2) | $552,500 |
| 2024 | $583,203 (22) | $734,500 (18) | n/a (2) | $545,000 |
| 2025 | $505,000 (24) | $787,000 (31) | n/a (3) | $572,500 |
| 2026 (Jan. to Sept.) | $677,000 (22) | $882,500 (30) | n/a (1) | $650,000 |
Median sale price and number of sales by year, Income property category, Duplex, Triplex and Quadruplex types, Centris (Matrix), October 8, 2026 harvest; house: median price of single-family houses, September 16 query. 2026: January to September.
What ten years of prices say in Sainte-Thérèse
- Ten years: duplex +201%, triplex +118%, house +152% in Sainte-Thérèse. The duplex rose the fastest. Since 2021: duplex +95%, triplex +43%.
- Per unit in 2026: $338,500 in a duplex, $294,167 in a triplex; in 2016, it was $112,500, $135,167. The cheapest unit is in the triplex.
- Peaks and dips: duplex at its highest in 2026 ($677,000), down in 2018, 2025; triplex at its highest in 2026, down in 2024.
- The duplex accounts for 39% of the 580 duplex, triplex and quadruplex sales in Sainte-Thérèse since 2016 (229 duplexes, 318 triplexes, 33 quadruplexes).
- Across the 23 cities tracked, the median duplex went from $221,000 to $500,000 (+122%), the triplex from $240,000 to $569,500 (+121%) and the quadruplex from $327,000 to $703,250 (+102%), against +133% for the house; a unit is worth $250,000 in a duplex and $175,812 in a quadruplex, and the duplex costs more than the house in 12 cities out of 23.
What it changes for buying or selling a plex in Sainte-Thérèse
In Sainte-Thérèse, the duplex is expensive, $677,000 in median, and it is priced about like a house (the median house is worth $650,000). This is the owner-occupant's market, someone who rents out the other unit to lighten their mortgage, more than the pure investor's: at $338,500 per unit, the rent rarely covers the loan with 20% down. The triplex and quadruplex, at $294,167 and n/a per unit, are the buildings where the yield calculation makes sense again, and where buyers are investors comparing with other cities. The price of all plexes combined and its trajectory are in plex prices in Sainte-Thérèse; the time to sell a building, in plex days on market in Sainte-Thérèse.
How to read these figures
The type is the one declared in the Centris listing: a duplex has two dwellings, a triplex three, a quadruplex four; five units and more (quintuplex) and mixed-use buildings are not in these three series, but are in the all-plex total on the plex prices in Sainte-Thérèse page. The median mixes new and century-old buildings, renovated or not, with or without a garage: it says where the middle of the market sits, not what a specific building is worth. The price per unit is the benchmark investors compare from city to city; the yield depends on the rents in place.
Frequently asked questions
How much is a duplex in Sainte-Thérèse in 2026?
$677,000 in median in 2026 (January to September, 22 sales), or $338,500 per unit; $225,000 in 2016 and $347,000 in 2021. The duplex rose +201% in ten years in Sainte-Thérèse.
And a triplex or a quadruplex in Sainte-Thérèse?
Triplex $882,500 ($294,167 per unit), quadruplex too rarely sold for a median. The extra unit costs $205,500 between the duplex and the triplex.
Does a duplex cost more than a house in Sainte-Thérèse?
Yes in 2026: $677,000 against $650,000 for the median house, 4% more. The duplex is priced like a house with a rent on top; that is the case in 12 cities out of 23.
Sources: Centris (Matrix), Statistics module, October 8, 2026 query for the municipality of Sainte-Thérèse, Income property category, Duplex, Triplex and Quadruplex types, median sale price and number of sales by year; median price of single-family houses, September 16, 2026 query; compiled by the Loaa & Manseur team, aggregates only, current year partial. The duplex, triplex and quadruplex prices in 23 cities hub compares the 23 cities.
Our other data series in Sainte-Thérèse, from the same Centris listings:
- Plexes that do not sell in Sainte-Thérèse, ten years
- How many plexes for sale in Sainte-Thérèse, ten years
Each series is recalculated from actual sales, aggregates only.
Our proof, not our promises
The Loaa & Manseur team, led by Lotfi Manseur and Loaa Al Daow, is the number 1 team at RE/MAX Platine in 2024 and 2025, 6th RE/MAX team in Quebec, 15th in Canada and in the global top 50 of large residential teams according to the official RE/MAX ranking, computed on actual transactions. Its Google profile counts more than 220 reviews with a 4.9 rating. Its offices are at 55 avenue de l'Équinoxe in Brossard, one bridge from the island, and every broker's licence can be checked in the OACIQ public register. Three things to verify yourself before calling us, and to demand of any other broker.
Also available in French: version française de ce guide.
Published September 7, 2026 by the Loaa & Manseur team, the number 1 team at RE/MAX Platine in 2024 and 2025, 6th RE/MAX team in Quebec, 15th in Canada and in the global top 50 according to the official RE/MAX ranking. Tell us about your project.