A borough with its own rules
LaSalle is a borough of the City of Montreal, and each borough sets its own roofing rules. General information on roofing in Montreal is not enough here. What matters is what LaSalle asks for, for your type of roof.
The City publishes two separate procedures for LaSalle. One covers flat or low-slope roofs, the other covers sloped roofs.
The buildings you find in LaSalle
LaSalle has single-family houses, duplexes and triplexes, apartment buildings, condos, and also commercial and industrial buildings. The roofs follow that variety. Plexes and apartment buildings often have a flat roof, while houses often have a sloped roof covered in shingles.
In LaSalle, flat roof standards depend on the total area of the roof, with the line drawn at 300 m². Below it, the City gives a list of ten new materials. Above it, the City requires a white roof, a reflective coating, white gravel or a material with a solar reflectance index of at least 56. A small plex and a large commercial building do not face the same list on the day the roofing is replaced.
Repairs that need no permit
According to the City, you need no permit in LaSalle to maintain or repair your roof. The examples given are simple.
- replacing a few shingles
- adding tar on a flat roof
- repairing the covering of a sloped roof
The City's examples are not a complete list. For a larger repair, such as a big section of membrane to redo, the City page does not say where the line falls. The LaSalle permit counter can decide before work begins.
When a repair needs a permit
Two situations change things in LaSalle.
The first is touching the insulation or the structure of the roof. The City writes this inside the minor repairs section itself. A repair that looked simple can require a permit if we find soaked insulation to replace or structure to rebuild.
The second is replacing the roofing, or changing the roof structure. The City classes this work as major renovation, and a permit is required.
Ask us to write in the quote what we plan to do if the insulation or structure turns out to be damaged.
When a permit applies, the review fees the City publishes for LaSalle are $9.80 per $1,000 of work. The minimum is $167.40 for a strictly residential building and $491.70 for a commercial, industrial, institutional or mixed-use building. These fees are non-refundable.
The LaSalle permit counter
The permit application can be made online. You need an account on montreal.ca, and payment is by credit card.
You can also apply in person at the LaSalle permit counter, 55, avenue Dupras. The City procedure for sloped roofs says the counter receives by appointment only. The flat roof procedure does not carry that note. Book an appointment before going, to be safe.
The City pages consulted give neither opening hours nor processing times. For both, contact the counter.
While you wait for our visit
Do not go up on the roof, even a flat one, and leave the ladder where it is. What you see from the ground, a window or inside is enough to describe the problem.
Note where water shows up on the ceiling and when. Photograph the stains, and the roof itself if you can see it from a window or the sidewalk.
You can ask us for a quote for a roof located in LaSalle. Ask us for our RBQ licence number and check it in the public register of the Régie du bâtiment du Québec, as with any contractor.
Four topics to go further in LaSalle
Flat roof in LaSalle. The full list of ten materials allowed under 300 m², and the reflectance requirements above it.
Shingle roof in LaSalle. The sloped roof, where replacing a few shingles ends, and which new materials the City accepts.
Commercial roofing in LaSalle. For managers of commercial, industrial or mixed-use buildings, with the minimum permit fee and the file to put together.
Roof replacement in LaSalle. The process for a fully redone roof, step by step.
Frequently asked questions
Do you need a permit to fix a roof leak in LaSalle?
No, according to the City, a roof repair in LaSalle requires no permit. A permit becomes necessary if the work touches the insulation or the structure of the roof, or if the roofing is replaced.
Is a white roof mandatory in LaSalle?
In LaSalle, a white or reflective roof is required only on flat roofs over 300 m², according to the City. Those roofs must be white, covered with a reflective coating or white gravel, or reach a solar reflectance index of at least 56. Below 300 m², the City gives a list of ten new materials with no reflectance threshold.
Where is the LaSalle permit counter?
The LaSalle permit counter is at 55, avenue Dupras, and receives by appointment only according to the City procedure for sloped roofs. The application can also be made online.
Will my insurance cover the repair?
Coverage for a roof repair depends on your policy and on the cause of the damage. Call your insurer before work starts, and keep your photos and our quote.
Official sources, consulted October 3, 2026: