Acoustic Studies for Mechanical Equipment Permits in Montreal

Installing or modifying mechanical equipment near a residential building is a common step in commercial, institutional, and industrial projects across Montreal. Examples include HVAC units, compressors, and rooftop ventilation systems. Montreal boroughs authorize these installations once an acoustical study confirms the resulting sound levels meet the applicable noise limit.

Montreal Noise Bylaws for Mechanical Equipment

Each Montreal borough enforces its own noise-control bylaws. The specific bylaw numbers and article references vary by borough, but the framework is consistent: two bylaws apply, each governing a different part of the requirement. A règlement d’urbanisme (urban planning bylaw) determines when a study is required. A règlement sur le bruit (noise bylaw) sets the limit the study must meet.

The urban planning bylaw includes conditions that determine when a noise study is needed. As a concrete example, Le Plateau-Mont-Royal’s bylaw (Article 423.7) requires one when the equipment serves:

• A residential building of 12 units or more
• A restaurant or artisanal brewery, regardless of size
• A commercial space larger than 500 m²
• A school, library, or museum
• A hospital, clinic, or long-term care facility
• An industrial space larger than 500 m²

The study requirement also applies independent of use or size, whenever two conditions hold together: the equipment sits at or below the ceiling level of a dwelling, and that dwelling is within 20 metres. Equipment serving a single dwelling only is excluded.

The noise bylaw specifies the limits that must be met at nearby residences and the methodology used to measure or predict compliance.

Acoustical Study for Mechanical Equipment

A compliant acoustical study typically includes the following work:

• Site and equipment information — Sonvera requests details about the project site and the equipment involved
• Existing equipment measurements — if equipment is already in place, Sonvera may measure its sound emissions directly
• Background sound measurements — Sonvera may measure ambient sound levels at the site; in areas with significant traffic noise, this can support relaxing the target limit
• Acoustical modelling — sound levels are predicted using specialized software
• Noise control design, where required — Sonvera designs the most appropriate corrective measures, selected for what can realistically be implemented on the equipment and the building

The result is a report built to satisfy the municipal requirements and ready for permit submission. Depending on site complexity, the study typically takes 4 to 6 weeks to complete.