There is no single Québec law governing residential outdoor lighting. Municipalities regulate it, and three requirements recur from one bylaw to the next: light must be aimed at the ground, the colour of the source is often capped, and nothing should spill onto a neighbouring property. Everything else depends on your town — and in the Mont-Mégantic region the rules are considerably stricter than elsewhere.
This is not legal advice. It’s a plain read of public texts, and your own municipality remains the only valid source for your address.
Quick reference
- No single provincial rule for lighting a house’s exterior.
- The power is municipal, through nuisance bylaws or zoning.
- The most universal requirement: the light flux goes downward.
- Colour temperature is often capped, in kelvins.
- The strictest case in Québec: the Mont-Mégantic International Dark Sky Reserve.
- What to check: your own municipal bylaw, before installing.
Where does the power to regulate come from?
From the municipal level. The Québec government’s urban planning guide states that a municipality may adopt nuisance bylaws under the Loi sur les compétences municipales (articles 59 to 61) and the Loi sur l’aménagement et l’urbanisme (article 113).
The same guide names lighting as an explicit example: a nuisance bylaw may include provisions countering the negative effects of excessive exterior lighting, in particular light directed toward the sky.
That’s why there’s no one answer. Two houses fifteen kilometres apart can fall under two different bylaws.
The rule that recurs everywhere: light points down
On the island of Montréal, the Saint-Laurent borough adopted light pollution rules whose first stated principle is to direct light flux toward the ground. The same regulation caps signage light sources at 4000 K and requires advertising panels to reduce their intensity between 11 p.m. and 6 a.m.
Two details are worth noting. Temporary exterior lighting for special events is excluded from the regulation’s scope. And the regulation is aimed first at signage and non-residential uses — it’s the downward-orientation principle that carries across other bylaws, not necessarily the 4000 K figure applied to a house.
The strictest case: Mont-Mégantic
The Mont-Mégantic International Dark Sky Reserve publishes concrete rules that are enforced through bylaws in the municipalities on its territory. For a fixture above 1,000 lumens, the reserve calls for an amber LED between 1800 K and 2200 K; below 1,000 lumens the ceiling is 3000 K. The fixture must send its light entirely toward the ground, and no light should go above the horizon.
White LED is prohibited for exterior use there, except for a few specific uses named in the bylaws.
If you live on that territory, a coloured facade for Halloween may simply not be permitted. That’s the kind of thing we’d rather tell you before the quote than after the install.
What this changes for a house
A rail mounted under the soffit throws its light downward onto the facade by construction. That is exactly the geometry most bylaws ask for — and it’s also why the light doesn’t clear the hedge into the neighbour’s yard.
Landscape lighting is the trickier half. A ground-mounted fixture uplighting a tree necessarily sends part of its output upward, and that’s where aiming and shielding matter. We account for it at the design step, both on the landscape lighting page and on the ground.
For holiday lighting, several municipalities allow seasonal or temporary exceptions — but not all of them, and not in the same way. Read your own town’s text.
How to check your town, in three steps
Look up your municipality’s zoning bylaw and nuisance bylaw on its website. The useful search terms in French are “éclairage extérieur”, “pollution lumineuse” and “nuisance”.
Then call the urban planning department and ask a specific question rather than a general one: is a fixed luminaire installed under the soffit, aimed at the ground, permitted at my address?
Finally, keep the answer in writing. An email confirmation from the planning department is worth more than a phone conversation.
The municipalities we work in are listed on the service area page, and product definitions live in the FAQ.
Common questions
Do I need a permit to install permanent lighting on a house? It depends on the municipality. Some require one under the zoning bylaw, others don’t. Ask your town’s planning department before work starts.
Can a neighbour complain about my lighting? Yes, and it usually goes through the nuisance bylaw. A fixture aimed at the ground, whose light doesn’t cross the property line, resolves most of these situations at the source.
Are Christmas lights covered by these bylaws? Often not, or only partly: several bylaws exclude temporary lighting tied to special events. But a permanent system running a festive scene isn’t temporary lighting — read it as a fixed installation.
Does Montréal have one bylaw for the whole city? No. Boroughs have their own, and Saint-Laurent is the one that moved earliest on light pollution.
Does this replace legal advice? No. It’s a read of the public texts cited above. Your municipality remains the only valid source for your address.
If you want to know what’s workable at your address before committing, book a free on-site estimate and we’ll look at your municipal bylaw alongside your facade.