Class 1B Rooming House Melbourne.
How the Class 1B classification applies to rooming houses — and the fire safety, egress, room-size and accessibility requirements that govern their construction.
Class 1B and the rooming house
Most rooming houses in Victoria fall under Class 1B of the National Construction Code. The classification recognises that a rooming house is not a standard dwelling — it is a building where multiple unrelated people live and share facilities — and it sets the construction requirements that follow from that use.
For a rooming house, Class 1B governs the fire safety, egress, separation, room sizes, sanitary facilities and accessibility of the building. These requirements are not optional add-ons; they shape the plan, the specification and the cost from the outset.
Class 1B rooming house requirements.
Smoke alarms
Interconnected smoke alarm systems to suit the classification and occupant count.
Egress paths
Safe, clear evacuation routes from every room and shared area.
Fire separation
Separation between rooms and between the building and boundaries to the required standard.
Room sizes
Minimum floor areas, ceiling heights and ventilation for lettable rooms.
Sanitary facilities
Bathroom and kitchen facility ratios for the number of occupants.
Accessibility
Accessible entries, circulation and facilities to the applicable standard.
Building approval for a Class 1B rooming house
A Class 1B rooming house requires a building permit and certification, separate from the planning permit. A building surveyor confirms the design and construction satisfy the NCC requirements for the classification. Because the requirements are specific, the design should be developed with the classification in mind from the start — resolving room sizes, egress and fire separation in the plan rather than retrofitting them later.
Class 1B rooming house FAQs.
Are all rooming houses Class 1B?
Most rooming houses in Victoria fall under Class 1B of the National Construction Code, but the correct classification depends on the use, scale and configuration. Some larger or differently-operated models may fall under other classes. Confirm the classification with a building surveyor early.
What fire safety does a Class 1B rooming house need?
Class 1B requires interconnected smoke alarms, appropriate egress paths and fire separation between rooms and to boundaries, sized for the number of occupants. The exact provisions depend on the scale and layout of the building.
Do Class 1B rooming houses need to be accessible?
Yes. Class 1B includes accessibility provisions for entries, circulation and facilities. The extent depends on the scale of the building and the applicable standard at the time of approval.
Build a compliant rooming house.
Class 1B shapes the rooming house from the first sketch. Assess your site and the classification that applies.
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