The most expensive house for sale on the Island of Montreal this month is the former residence of industrialist J.W. McConnell in the Golden Square Mile, asking $29.5 million. Westmount holds five of the island’s 10 priciest listings, with lakefront estates in Senneville and Baie-d’Urfé close behind.
Montreal’s top tier sits just below the national cutoff this month; our national list starts at $31.5 million. CREA reported last month that national sales had stalled for a fourth straight month, and the Bank of Canada decides on rates Oct. 28.
How we built this list, and its limits: We ranked detached houses on the Island of Montreal by asking price, checking each Centris or brokerage listing individually on Oct. 1, 2026. Centris does not publish a sortable island-wide price ranking, so we searched the island’s highest-priced areas: the Golden Square Mile, Westmount, Outremont, the Town of Mount Royal, Côte-des-Neiges, Senneville, Baie-d’Urfé, Beaconsfield and L’Île-Bizard. It is possible a higher-priced listing elsewhere on the island was missed. Condos and income properties are excluded. None of these listings has a publicly reported celebrity owner.
A note on photos: listing photo galleries belong to the brokerages and photographers who made them, so we do not republish them. Each entry links to the full listing, where you can see the real home. The photos below show the actual No. 1 property and come from Wikimedia Commons under a free licence.
1. Golden Square Mile (avenue des Pins Ouest): $29,500,000
Built in 1918 and designed by American architect Charles A. Platt, this house was the residence of industrialist and philanthropist J.W. McConnell, according to the listing. It has 28 rooms, including 12 bedrooms, on a lot of about two acres, with an elevator and parking for 15.
See the full listing and photo gallery: Sotheby’s International Realty Quebec (via Centris)
2. Upper Westmount: $21,800,000
Behind gates and mature hedges, this 1926 home has seven bedrooms and about 6,680 square feet on a 16,071-square-foot lot, with a heated pool, a 20-foot sunroom, a 14-foot custom bar, city and river views and parking for 15.
See the full listing and photo gallery: Centris listing
3. Upper Westmount: $21,000,000
A 1920 six-bedroom house on a 12,068-square-foot lot, this home has a new kitchen, geothermal heating, an elevator, an integrated double garage, a heated pool and terraces with city views.
See the full listing and photo gallery: Centris listing
4. Senneville (Lac des Deux Montagnes): $19,800,000
A chateau-style estate built in 1899 on a private peninsula of about 19.6 acres, this eight-bedroom house has 37 rooms, an elevator, a heated indoor pool, a gated tree-lined drive and lakefront views.
See the full listing and photo gallery: Centris listing
5. Westmount: $18,000,000
This 1912 mansion has seven bedrooms, 7,287 square feet and 10-foot ceilings, with its roof, masonry and windows renewed in 2026. It has a 40-by-17-foot heated pool, English-style landscaping and an eight-car garage.
See the full listing and photo gallery: Centris listing
6. Baie-d’Urfé (Lac Saint-Louis): $15,500,000
Built in 2015 on 60,500 square feet of lakefront on Lac Saint-Louis, this five-bedroom stone house has 29 rooms, an elevator, a heated pool and a six-car garage.
See the full listing and photo gallery: Centris listing
7. Senneville (Lac des Deux Montagnes): $14,750,000
A 2009 stone residence on about 9.7 waterfront acres, this five-bedroom home has 6,312 square feet, a heated pool, gardens and a four-car garage.
See the full listing and photo gallery: Centris listing
8. Westmount: $10,900,000
Built in 1955 and substantially rebuilt and extended in 2009, this six-bedroom house on a 9,821-square-foot lot has a heated pool and a primary suite with his-and-hers walk-in closets and a private balcony.
See the full listing and photo gallery: Centris listing
9. Upper Westmount: $9,500,000
A recently renovated 1929 stone mansion on a 13,058-square-foot lot, this four-bedroom home has a flowing ground floor for entertaining, a heated pool and an integrated double garage.
See the full listing and photo gallery: Centris listing
10. Côte-des-Neiges-Notre-Dame-de-Grâce: $7,500,000
A Georgian-inspired stone residence built in 1939, this 22-room home has a pedimented central entrance, a west-facing garden, a new roof and furnace and an integrated double garage.
See the full listing and photo gallery: Engel & Völkers Montreal
Prices are asking prices from active listings checked Oct. 1, 2026, and can change at any time.
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