Dorval
What are the rules for a home extension in Dorval?
A permit is required to extend the house, after a PIIA (site planning and architectural integration) review approved by council.
Permit requiredA zone, a heritage area or a shoreline can have its own standards: with your address, the Radar reads your zone's grid and tells you what applies to your property.
The rules, in short
Rules from Chapter 7 (Residential neighbourhood zones H) of By-law RCM-60A-2015. The consolidation does not print section numbers, so sections are cited by their heading, except sections 336 and 356, which the text names. Setbacks come from each zone's grid of uses and standards.
- Attached or built-in garage: the house's front and rear setbacks; 1.5 m from the side line (0.61 m if the side setback is 3.95 m or less); at most 56 m². (ch. 7, div. 5, subdiv. 2, "Attached or built-in garage and carport")
- Permanent storm porch, porch or vestibule: may project 1.55 m into the setback (3 m² at most in the front and side setbacks). (ch. 7, s. 356, table, row 29)
- Detached single-family house: side setbacks of 2.10 m and 3.95 m may be replaced by two 3 m setbacks. (ch. 7, div. 1, "Side setback for use class h1")
- A permit is required for any extension; a PIIA review approved by council is required to extend any residence. (City page on permit and certificate applications (PIIA procedure))
Summary by Radar Foncier, in our own words: the official French text of the by-law, linked above, prevails.
Applying in Dorval
- Processing time: 30 working days after a complete application is filed
- Urban planning department: 514 633-4084
- Permits on the municipality's website
For the permit application, you will often need a site plan (certificat d'implantation) drawn up by a land surveyor: certificate of location and site plan, what to know (in French).
Other projects in Dorval
Home extension elsewhere: Gatineau, Montreal, Sherbrooke, Vaudreuil-Dorion, Westmount.
Version française de cette page
Source: Zoning By-law RCM-60A-2015 (administrative consolidation up to December 16, 2025), French version, checked on October 25, 2026. Plain-English summary: the official French text prevails, and a by-law can change. Confirm with the Dorval urban planning department before buying materials. Radar Foncier is an independent service, not affiliated with the municipality.
Radar Foncier in English. Permits and rules for Québec homeowners; the full site and the reports are in French. Version française