Intergenerational · Longueuil · 2026
The exact category of the by-law in Longueuil, its conditions, the permit fee, and the checklist before buying or converting.
Intergenerational home in Longueuil in 2026: Longueuil posts no “intergenerational dwelling” sheet: the rules for a supplementary dwelling inside the house fall under zoning by-law 728 and its grid by zone, to be checked with 311. For the detached building, the City evaluates compatibility with the neighbourhood, siting in the rear or side yard, preservation of trees of 10 cm and more, an independent connection to the networks, fire department access and underground connection to utilities. After the conditional use, a building permit is required, and its issuance is conditional, on top of the standard fees, on paying connection fees of $35,000 for a dwelling in a detached building. Everywhere in Quebec, zoning may allow a single supplementary dwelling per main dwelling, reserved for family or not depending on the city, and the 2024-2029 by-right rule allows an accessory dwelling in a detached single-family home within the urban perimeter. Caregiver tax credit of $1,494 for a parent aged 70 or over who lives with you. Sources read on 16 September 2026.
Longueuil posts no “intergenerational dwelling” sheet: the rules for a supplementary dwelling inside the house fall under zoning by-law 728 and its grid by zone, to be checked with 311. The only published sheet (July 2025) covers an additional dwelling built in a building detached from the main building, allowed across the territory except Industrial and Agricultural designations, for a single-family, two-family or three-family home, through a conditional use.
For the detached building, the City evaluates compatibility with the neighbourhood, siting in the rear or side yard, preservation of trees of 10 cm and more, an independent connection to the networks, fire department access and underground connection to utilities.
After the conditional use, a building permit is required, and its issuance is conditional, on top of the standard fees, on paying connection fees of $35,000 for a dwelling in a detached building. For a dwelling inside the house, the permit fee is obtained from 311. For a new build or an extension, the general fee is on our page building permit by city.
Québec.ca (urban planning decision guide, “Logement intergénérationnel”, updated 31 August 2026): the zoning by-law may allow a single supplementary dwelling per main dwelling, intended for people in an established category who have, or have had, a family or marriage link with the main occupant, and the municipality sets the conditions of layout and occupancy, which may vary from one category of buildings to another. From 21 August 2024 to 21 August 2029, the Act to amend various legislative provisions respecting housing allows an accessory dwelling to be built by right in a detached single-family home located within the urban perimeter, outside places subject to public-safety constraints and outside heritage buildings, even if the zoning by-law does not allow it (summary published by the City of Terrebonne). The caregiver tax credit (caregiver tax credit of $1,494 for a person aged 70 or over who lives with you, and of $1,494 to $2,988 for an adult with an impairment living with you) and the GCR warranty on a new intergenerational build apply in Longueuil as elsewhere; our guide to the intergenerational home in Quebec compares the ten cities.
Longueuil posts no “intergenerational dwelling” sheet: the rules for a supplementary dwelling inside the house fall under zoning by-law 728 and its grid by zone, to be checked with 311. The family link, when required, is in the City's by-law; otherwise the category is an accessory or additional dwelling open to all.
After the conditional use, a building permit is required, and its issuance is conditional, on top of the standard fees, on paying connection fees of $35,000 for a dwelling in a detached building.
Yes, when the unit has its permit and respects the City's category: it appeals to families looking for exactly that and to buyers who see one more dwelling. Without a permit, it sells for less and more slowly.
Sources: longueuil.quebec, simplified information sheet “Logement additionnel aménagé dans un bâtiment détaché du bâtiment principal” (July 2025), read on 16 September 2026; Québec.ca (intergenerational dwelling, 31 August 2026); revenuquebec.ca. Informational page: the City decides for your address.
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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.
Équipe no 1 de RE/MAX Platine en 2024 et en 2025, 6e au Québec, 15e au Canada et dans le top 50 mondial au classement officiel RE/MAX. Réponse en moins de 24 heures, sept jours sur sept.