Royal Oak, MI Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Section 770-90J of the Royal Oak City Code, part of the Landscaping, Greenbelts, Buffers and Screening article of the zoning chapter, singles out generators and heating, ventilation, and air-conditioning units for placement rules. Ground-mounted units must be located on the side of the building farthest from adjacent residential uses, must not cause excessive nuisance or offense to occupants of nearby buildings, and must be screened with plantings or an enclosure matching the building's architectural theme whenever visible from a right-of-way or a residential use. Roof-mounted units face a parallel test: they must sit away from public view and as far as possible from the front facade, avoid causing nuisance to neighbors, and be concealed by decorative fencing, a parapet, or another Planning Commission-approved method.

Because this sits inside the site plan review process, the Planning Commission enforces these placement and screening standards at the time a building permit or site plan is approved, and any HVAC installation that generates a nuisance complaint after the fact falls back on the City's general environmental performance standards at § 770-92, which bar any use from creating a dangerous, injurious, noxious, or otherwise objectionable condition. The code does not set a separate decibel cap for mechanical equipment; instead it relies on the citywide sound-level table in § 770-94 for any measurable noise dispute.