Old Longueuil is the oldest part of the agglomeration, and the borough where planning rules change fastest from one street to the next. Two houses of the same age, five minutes apart on foot, are not renovated under the same constraints.
What moves prices here
Walking distance to the metro. According to the STM, the yellow line has only three stations, Berri-UQAM, Jean-Drapeau and Longueuil-Université-de-Sherbrooke, the last being the terminus, with service from 5:30 a.m. to 1 a.m. on weekdays. Two stops separate the sector from downtown Montreal.
The era of construction. The stock runs from the old core to post war cottages and bungalows, then to plexes and recent condominium towers near the metro. The age of the building sets the size of the work to expect, and it is that amount that gets negotiated.
In August 2026, in the Montreal CMA, the APCIQ recorded 2,853 sales and 20,128 active listings, median prices of $650,000 for single-family homes, $437,250 for condominiums and $856,000 for plexes, and a 28% year over year increase in supply on the South Shore. Those figures place a regional trend, not the price of a street.
The sectors
The heritage core, around rue Saint-Charles Ouest and the co-cathedral Saint-Antoine-de-Padoue, holds the oldest built fabric. This is where chemin de Chambly begins, at the intersection of rue du Bord-de-l’Eau, a road ordered in October 1665 by the governor of New France. The SDC Espace Saint-Charles counts more than 150 businesses there, and the Ville de Longueuil has announced a major infrastructure rebuild on rue Saint-Charles.
The metro sector and place Charles-Le Moyne is the densification pole. The Ville de Longueuil describes a 30 storey tower with 389 dwellings above the station, and a 26 storey tower with 336 dwellings on rue Saint-Charles Ouest. The RTL’s terminus Longueuil, at 120, place Charles-Le Moyne, opens onto a network of 152 bus routes, according to the RTL.
Montréal-Sud is the closest to the Jacques-Cartier bridge and to the corridor of Autoroute 20 and Route 132. A village in 1906 and a city from 1911 until its annexation to Longueuil in 1961 according to the Ville de Longueuil, it keeps a tight built fabric on narrow lots.
Coteau-Rouge and LeMoyne come from two municipalities that no longer exist: the former ville Jacques-Cartier, from 1947 to 1969, and the former city of LeMoyne, founded in 1949, according to the Ville de Longueuil. Post war construction dominates, on small lots, often enlarged over the decades. This is where the gap between how a property looks and its real condition is widest.
Fatima and parc Michel-Chartrand offer later streets and the largest green space in the borough: 1,850,000 square metres and close to 20 kilometres of trails, according to the Ville de Longueuil.
The cited heritage site, and what it changes
The Ville de Longueuil counts three heritage sites cited under the Cultural Heritage Act: the Maison Michel-Dubuc, the Hôtel-du-Roi and the one in Vieux-Longueuil, which groups more than 950 buildings. The Répertoire du patrimoine culturel du Québec dates the citation to 14 July 1993 and counts roughly 455 buildings with strong heritage potential, inside an irregular polygon bounded notably by rues Saint-Charles Ouest, du Bord-de-l’Eau, Joliette and d’Auvergne.
Within the site, the city requires a heritage site application before, among other things, a new construction, repairing or modifying the exterior appearance in any way, an excavation, a cadastral operation or moving a building. The conseil local du patrimoine studies the application and sends its recommendation to the borough council; the construction permit comes afterward.
A purchase offer conditional on exterior work inside that perimeter has to allow for these steps. The guide on buying an old or heritage building covers the rest.
Selling in Old Longueuil
The buyer pool is double: the South Shore, and those leaving the island who compare your property against what they would have had in Hochelaga or Rosemont. That comparison often decides the offer.
Three documents weigh on the price obtained here: an up to date certificate of location, the invoices for major work with their years, and, inside the heritage site, the municipal resolutions for exterior work already approved. A buyer who sees them does not discount for risk.
The comparative analysis is prepared at no charge, with closed sales from your sector. One example sold here: the two-storey home at 28, rue St-Hilaire, from 1949, whose listing states a roof, plumbing and electrical redone in 2014.
Buying in Old Longueuil
The heritage status of the address, before the inspection: it governs the schedule of any exterior project.
The water service line. The Ville de Longueuil states that lead found in tap water comes essentially from the service line, mainly in buildings built between 1940 and 1970, and not from its plants or its distribution mains. On a house from that period, the question is raised before the offer.
The age of the systems: electrical entrance, plumbing, French drain, roof. Installing a French drain does not require going through the conseil local du patrimoine.
The flood zone status, read address by address on the Government of Quebec interactive flood zone map: it affects insurance and financing.
The leases in force, for any plex: the Quebec rent setting regime tightly frames increases. The detail is in the home inspection checklist.
Where to start
Establish your range with the affordability calculator, then add the transfer duties to your closing costs. The overall picture is on the Longueuil page. You also benefit from the Intégri-T guarantee, paid by the seller or by the buyer, covering up to $50,000 in latent defects for three years.
For an evaluation at no charge and with no obligation, write to me through the contact form.