Plant room
A plant room houses a building's AHUs, pumps, switchboards, and lift motors. NCC C3D13 sets FRL separation, acoustic, ventilation, and access rules.
Ask Chalkline about this →A plant room is a dedicated room housing a building’s mechanical, hydraulic, and electrical services: AHUs, pumps (hydraulic, fire-fighting, hot water), main switchboards (MSBs), lift motor rooms, and emergency generators. The term covers basement service rooms and rooftop enclosures.
NCC requirements
NCC 2022 Volume One C3D13 sets minimum fire separation. The separating construction must achieve an FRL of not less than 120/120/120 for lift motor rooms, generators, smoke control plant, boilers, and large battery systems. Access doorways require FRL -/120/30 with self-closing fire doors. Between a lift shaft and its motor room the minimum FRL is 120/-/- (verified 2026-06-11, NCC 2022 Vol 1 C3D13 via cybilconsults.com.au).
Under F7D6, a wall separating a sole-occupancy unit from a plant room must achieve Rw not less than 50 (Ctr not required), limiting mechanical noise transfer (verified 2026-06-11, NCC 2022 Vol 1 F7D6).
Ventilation must meet Part F6 for the equipment. Access for maintenance is addressed in SA Part G8; other states apply it via the performance requirement pathway.
Builder read
Plant rooms get squeezed in design. An undersized room creates acoustic defects (AHU vibration is hard to isolate in a tight space), access defects (maintenance contractors cannot safely reach equipment), and FRL compliance defects (penetrations are harder to seal). Coordinate structural, services, and acoustic engineers early. A plant room directly above or adjacent to bedrooms is a noise risk regardless of the rated wall; check the layout at design stage, not at handover.
Category: Building services.
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See also
Last updated: 2026-06-11. Verified: 2026-06-11. Quarterly review for currency.