Plex · Investing · Sainte-Thérèse · 2026
The plex in Sainte-Thérèse in 2026, figure by figure: what it costs, what each door is worth, how fast it sells, what down payment it takes, and what the median does not say. Centris sales, nothing estimated.
In Sainte-Thérèse, the median plex sold for $815,000 from January to September 2026, against $390,000 in 2016 (+109%) and $560,000 in 2021 (+46%); the single-family house gained +152% over the same period. It sells in 11 days in median, against 12 days for the house, and at 98% of the asking price: the plex buyer still negotiates 2%. Per unit, the duplex comes to $338,500, the triplex comes to $294,167: the cheapest door is the triplex's, 55% below the median house ($650,000). 55 plexes changed hands in nine months for $49M. Source: Centris (Matrix), compiled October 13, 2026.
The short answer
In Sainte-Thérèse, the median plex sold for $815,000 from January to September 2026, against $390,000 in 2016 (+109%) and $560,000 in 2021 (+46%); the single-family house gained +152% over the same period. It sells in 11 days in median, against 12 days for the house, and at 98% of the asking price: the plex buyer still negotiates 2%. Per unit, the duplex comes to $338,500, the triplex comes to $294,167: the cheapest door is the triplex's, 55% below the median house ($650,000). 55 plexes changed hands in nine months for $49M.
The plex in Sainte-Thérèse in 2026, in one table
| Indicator (Sainte-Thérèse) | 2016 | 2021 | 2025 | 2026 (Jan. to Sept.) |
|---|---|---|---|---|
| Median price, plex (all sizes) | $390,000 | $560,000 | $767,500 | $815,000 |
| Average price, plex | $404,745 | $587,742 | $776,628 | $823,631 |
| Plex sales | 47 | 127 | 70 | 55 |
| Median days on market | 67 days | 30 days | 13 days | 11 days |
| Sold price over asking price | 95% | 99% | 98% | 98% |
| Dollar volume sold | $19M | $75M | $54M | $49M |
| Median single-family house, for comparison | $258,125 | $452,000 | $572,500 | $650,000 |
Income property category (duplex, triplex, quadruplex and up) and Single-family category for the municipality of Sainte-Thérèse, Centris (Matrix); 2026 = January to September.
Three readings. The plex gained 109% in ten years, less than the house (152%), because its price is held by rents and not by the buyer's emotion. Over five years, +46% for the plex against +44% for the house. It sells faster than the house (11 days against 12 days): investors are there, and in a hurry. In 2016, it took 67 days. The price fell in 2018, and the 2026 price is the highest of the series.
Duplex, triplex or quadruplex: the price of the door
| Type (Sainte-Thérèse, Jan. to Sept. 2026) | Median price | Price per unit | Sales | Since 2016 | Since 2021 |
|---|---|---|---|---|---|
| Duplex | $677,000 | $338,500 | 22 | +201% | +95% |
| Triplex | $882,500 | $294,167 | 30 | +118% | +43% |
The duplex makes 39% of plex sales in Sainte-Thérèse and costs 4% more than the median house: it is the building of the first-time buyer who wants a rent to help with the mortgage. Going from the duplex to the triplex adds $205,500 (+30%), and the door goes from $338,500 to $294,167. The quadruplex is not published in Sainte-Thérèse: too few sales a year for a reliable median. The year-by-year detail is in duplex, triplex and quadruplex prices in Sainte-Thérèse since 2016.
What the ranking says in Sainte-Thérèse
- Sainte-Thérèse ranks 22 out of 23 cities for the price of the cheapest door ($294,167, the triplex); the median of cities is $171,250. It is one of the most expensive doors among the cities tracked.
- Across the 23 cities tracked, the plex rose faster than the house in 8 cities over ten years (medians: plex +116%, house +133%); it sells more slowly than the house in 16 cities, and below asking in 21.
- The quadruplex offers the cheapest door in 14 of the 19 cities where it is published; the cheapest door is below the median house price in 23 cities out of 23.
- There are 3.6 months of plex inventory in Sainte-Thérèse against 2.6 for the house: the plex is chosen, the house is fought over. And 24% of plexes listed in 2026 left the market unsold, against 15% of houses: the overpriced listing does not sell, even here.
- By price range, over the past twelve months, the fastest plex in Sainte-Thérèse is the one $1M and up (12 days), the slowest the one $750,000 to $1M (22 days).
Financing a plex in Sainte-Thérèse
- Owner-occupant of a duplex: insured loan, minimum down payment of 5% on the first $500,000 and 10% on the remainder, or $42,700 on the median duplex in Sainte-Thérèse ($677,000); the second unit's rent counts in part toward your borrowing capacity.
- Owner-occupant of a triplex or quadruplex: 10% minimum, or $88,250 on the median triplex, insured loan possible under the $1.5 million cap.
- Non-occupant: 20% minimum, or $163,000 on the median plex and $135,400 on the duplex, and the lender only counts a fraction of the rents (often 50 to 80%) to qualify the loan.
- Five units and more: commercial loan, assessed on the building's net income rather than on your income.
- The costs: the welcome tax in Sainte-Thérèse is calculated on the full price, and the inspection of an old building is worth its price.
What the median does not say
A plex is worth what its leases allow you to pay, and the Sainte-Thérèse median says nothing about the leases of a particular building. At the median price, fully rented at market rent and financed at 80%, a plex rarely pays for itself in 2026: it is bought for the capital repaid by tenants, the appreciation and, often, the owner's own unit. Before offering, read the actual leases and their dates, the history at the Tribunal administratif du logement and the income proven by statements; the rents of leases signed in Sainte-Thérèse are in rent in Sainte-Thérèse. The checklist is in how to choose a good rental property and the owner's rules in the Quebec rental property owner's guide.
How to read these figures
The median price is that of the middle sale: half of the plexes in Sainte-Thérèse sold for more, the other half for less. The average price, pulled up by large buildings, is always above it. The price per unit divides the type's median by its number of units: it compares buildings of different sizes, not units of the same floor area. A type is published from five sales a year over nine years or more.
Frequently asked questions
How much does a plex cost in Sainte-Thérèse in 2026?
$815,000 in median for all plexes sold in Sainte-Thérèse from January to September 2026 (Centris, Matrix); $677,000 for a duplex, $882,500 for a triplex. The average price is $823,631.
Does a plex sell faster than a house in Sainte-Thérèse?
Yes: 11 days in median for the plex against 12 days for the house in 2026. Across the 23 cities tracked, the plex is slower than the house in 16 cities.
What down payment for a plex in Sainte-Thérèse?
$42,700 at minimum on the median duplex if you live in it (5% up to $500,000, 10% beyond), $88,250 on the median triplex (10%); $163,000 (20%) on the median plex if you do not live in it. To be confirmed with your mortgage broker.
Which type of plex costs the least per unit in Sainte-Thérèse?
The triplex: $294,167 per unit in Sainte-Thérèse in 2026, against $338,500 for the duplex. Each additional unit costs less, but also has to be managed; the quadruplex offers the cheapest door in 14 of the 19 cities where it is published.
Sources: Centris (Matrix), Statistics module, September and October 2026 queries for the municipality of Sainte-Thérèse, Income property category (median and average price, sales, volume, median days, sold-to-asking ratio, duplex, triplex and quadruplex types, inventory, expired listings) and Single-family category; compiled by the Loaa & Manseur team on October 13, 2026, aggregates only. Financing rules: mortgage insurers and lenders, to be confirmed with your mortgage broker. The investing in a plex in Quebec, 23 cities hub compares the 23 cities.
Our other plex series in Sainte-Thérèse, from the same Centris listings:
- Plex prices in Sainte-Thérèse, ten years
- Plex days on market in Sainte-Thérèse, ten years
- Plex sales volume in Sainte-Thérèse, ten years
Each series is recalculated from actual sales, aggregates only.
And what a plex really earns in Sainte-Thérèse:
Cap rate, cash flow and owner-occupant cost at the median price and the median rent, same Centris listings, team assumptions.
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.