Bedrooms · Westmount · Centris 2016-2026
The median sale price of a 3-, 4- and 5-plus-bedroom house in Westmount, year by year since 2016: what the fourth bedroom costs, what the fifth is worth, and which size rose the most. Centris figures, not estimates.
In Westmount, the fourth bedroom is expensive: a 3-bedroom house sells for $1,665,000 at the median in 2026 (January to September), a 4-bedroom for $1,975,000, $310,000 (+19%) more, one of the widest gaps among the 52 cities tracked (rank 12). A house with 5 or more bedrooms sells for $2,500,000, $525,000 (+27%) more than a 4-bedroom. Since 2016: 3 bedrooms +86%, 4 bedrooms +70%, 5 or more +57%. Source: Centris (Matrix), compiled September 28, 2026.
The short answer
In Westmount, the fourth bedroom is expensive: a 3-bedroom house sells for $1,665,000 at the median in 2026 (January to September), a 4-bedroom for $1,975,000, $310,000 (+19%) more, one of the widest gaps among the 52 cities tracked (rank 12). A house with 5 or more bedrooms sells for $2,500,000, $525,000 (+27%) more than a 4-bedroom. Since 2016: 3 bedrooms +86%, 4 bedrooms +70%, 5 or more +57%.
Median price by number of bedrooms, year by year
| Year | 3 bedrooms, median price | Sales | 4 bedrooms, median price | Sales | 5+ bedrooms, median price | Sales | Fourth-bedroom premium |
|---|---|---|---|---|---|---|---|
| 2016 | $895,000 | 28 | $1,160,000 | 78 | $1,589,000 | 118 | +30% |
| 2017 | $1,050,000 | 29 | $1,300,000 | 71 | $1,724,000 | 107 | +24% |
| 2018 | $1,270,000 | 19 | $1,585,000 | 70 | $2,000,000 | 99 | +25% |
| 2019 | $1,650,000 | 16 | $1,625,000 | 62 | $2,120,000 | 90 | -2% |
| 2020 | $1,532,000 | 23 | $1,798,750 | 63 | $2,295,000 | 100 | +17% |
| 2021 | $1,570,000 | 23 | $1,975,000 | 66 | $2,117,500 | 97 | +26% |
| 2022 | $1,752,500 | 19 | $2,007,500 | 51 | $2,592,500 | 72 | +15% |
| 2023 | $1,835,000 | 17 | $2,040,000 | 65 | $2,260,000 | 76 | +11% |
| 2024 | $1,600,000 | 26 | $1,922,500 | 64 | $2,512,500 | 92 | +20% |
| 2025 | $1,875,000 | 25 | $1,899,500 | 72 | $2,532,500 | 101 | +1% |
| 2026 (Jan. to Sep.) | $1,665,000 | 17 | $1,975,000 | 47 | $2,500,000 | 72 | +19% |
Closed sales on Centris from 2016 to September 2026: 242 3-bedroom houses, 709 4-bedroom and 1,024 with 5 or more. When a year has few sales, its median swings a lot: read the trend, not a single year.
What ten years of sales say in Westmount
- The small house rose fastest in Westmount: +86% for 3 bedrooms, against +70% for 4 and +57% for 5 or more. That is the case in 11 of 52 cities: first-time buyers drove prices, not large families.
- The fourth bedroom costs less than it did: +30% in 2016, +19% in 2026 ($310,000). 3-bedroom homes caught up with 4-bedroom ones: a sign that the entry level has become scarce.
- The 5-plus-bedroom house cost more than the 4-bedroom every year since 2016: in Westmount, the fifth bedroom belongs to large recent houses, not to converted basements.
- Share of 3-bedroom homes in sales: 12% in 2016, 12% in 2026 (over ten years: 3 bedrooms 12%, 4 bedrooms 36%, 5 or more 52%).
- 2019 to 2022, the three rock-bottom-rate years: 3 bedrooms +6%, 4 bedrooms +24%, 5 or more +22%.
- 2026 (January to September) versus 2025: 3 bedrooms -11.2% ($1,875,000 to $1,665,000), 4 bedrooms +4.0% ($1,899,500 to $1,975,000), 5 or more -1.3% ($2,532,500 to $2,500,000).
- Annual peaks: 3 bedrooms $1,875,000 in 2025, 4 bedrooms $2,040,000 in 2023, 5 or more $2,592,500 in 2022. The 4-bedroom house fell in 2024, 2025.
Is the fourth bedroom worth paying for in Westmount?
In Westmount, the fourth bedroom is a different product: $310,000 more at the median (+19%). At that price you are not buying a room, you are changing house: newer, larger, often with a garage and a wider lot. For a family that needs the bedroom, the cheaper route is often a 3-bedroom house with a basement to finish; for the seller of a 4-bedroom house, it is the argument to lead with. The fifth bedroom, for its part, costs $525,000 (+27%): in Westmount, the 5-plus-bedroom house is the large recent home with an office, and its market is narrow (72 sales from January to September 2026).
How to read these numbers
The bedroom count is the one on the Centris listing of each house sold, all bedrooms counted, basement included; "5 or more" groups 5, 6 and more bedrooms. Houses with 1 or 2 bedrooms, marginal among single-family homes, are not counted. The median price is the middle price: half the sales above, half below. 2026 covers January to September. The fourth-bedroom premium compares two medians of the same year: it includes everything that usually comes with an extra bedroom (floor area, age, garage), not only the room. For your house, a broker evaluation starts from the house, not the category.
Frequently asked questions
How much does a 4-bedroom house cost in Westmount in 2026?
$1,975,000 at the median for a 4-bedroom house sold in Westmount from January to September 2026 (47 sales), against $1,665,000 for 3 bedrooms and $2,500,000 for 5 or more.
How much is one more bedroom worth in Westmount?
From 3 to 4 bedrooms: $310,000 (+19%) at the 2026 median. From 4 to 5 or more: $525,000 (+27%). In 2016 the fourth bedroom cost +30% and the fifth +37%.
Which house size gained the most value in Westmount?
The house with 3 bedrooms: +86% between 2016 and 2026, against +86% for 3 bedrooms, +70% for 4 and +57% for 5 or more.
Source: Centris (Matrix), Statistics module, queries run on September 28, 2026 for the municipality Westmount: Single-family category, number of bedrooms equal to 3, equal to 4, then 5 or more, median sale price and number of sales by year over ten years; compiled by the Loaa & Manseur team, aggregates only, current year partial. The house prices by number of bedrooms hub compares all 52 cities; home prices in Westmount give the all-sizes series.
Our other data series in Westmount, from the same Centris listings:
Each series is recalculated from actual sales, aggregates only.
And the condo by number of bedrooms in Westmount:
Condos with 1, 2 and 3 or more bedrooms, ten years of median prices from the same Centris listings.
And how long it takes to sell in Westmount:
Median days on market for houses and condos, ten years from the same Centris listings.
And the number of sales in Westmount:
Houses, condos and plexes sold per year, ten years from the same Centris listings.
And the number of homes for sale in Westmount:
Inventory and new listings per year, ten years from the same Centris listings.
And sale price relative to asking in Westmount:
Bidding wars or negotiation, year by year, ten years from the same Centris listings.
And the houses that do not sell in Westmount:
Expired listings and failure rate, year by year, ten years from the same Centris listings.
And the average house price in Westmount:
Mean, median and asking price, year by year, ten years from the same Centris listings.
And the sales volume in Westmount:
How many dollars change hands each year, and whether price or the number of sales rose, ten years from the same Centris listings.
And house appreciation in Westmount:
What a house bought in each year since 2016 is worth today, ten years from the same Centris listings.
And the jump from condo to house in Westmount:
The gap between house and condo year by year, and how much of it the condo's gain covers, ten years from the same Centris listings.
All the statistics in Westmount at a glance:
Twelve 2026 Centris indicators, the city's rank on each, and a link to ten years of detail.
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.