Heat pumps in Saint-Lambert: permits and bylaws
Planning a heat pump or an air conditioner in Saint-Lambert? Here is what the bylaws say: the permit, the distance from the lot lines, where the unit can go and the noise limit. It all comes from the official texts.
Five spots, one answer for each.
Each answer is the bylaw rule, in short. “Not specified” means the text does not say: ask urban planning.
2 m from the lot lines. Hidden from the street by a cedar hedge, evergreen shrubs or a screen no higher than 1.85 m.
2 m from the lot lines. Hidden from the street by a cedar hedge, evergreen shrubs or a screen no higher than 1.85 m.
Not allowed in the front yard.
Buildings with 4 to 12 dwellings only: on a balcony, against a side or rear wall, not visible from the street.
Roof: inside a penthouse or behind a visual and acoustic screen, 3 m from the street façade and 2 m from the other walls.
Good to know, and who to call.
Good to know
- 2 units at most per dwelling (plus the pool heater), 1.85 m high at most; stacking only from the ground, up to 2 m.
- Corner lot: allowed in the secondary front yard, but not inside the secondary front setback.
- Application: provide the unit’s height, size, decibel rating and a site plan.
The short answers.
Do you need a permit to install a heat pump in Saint-Lambert?
Certificate of authorization required (mechanical equipment).
How far from the lot lines must the unit be?
2 m from the side and rear lot lines (encroachment of 0.6 m at most into the setback).
Can a heat pump go in the front yard?
No. Not allowed in the front yard.
What is the noise limit?
50 dB or more at the lot line, at any time: not allowed.
Who should I call to confirm before the work?
Urban planning department, 450 672-4444, option 4, urbanisme@saint-lambert.ca.
Read at the source.
Sources: Zoning bylaw 2024-215, ch. 5 (accessory constructions and equipment table for residential uses, row 23; section 5.8; rooftop equipment); permits and certificates bylaw 2023-218, s. 3.2.1 h); nuisance bylaw 2006-19, s. 5.3 (consolidated November 25, 2025).
Checked by AirGreen on September 30, 2026.
This page is a summary. The official bylaw prevails. Confirm with the city before the work.
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