There must be enough room in the vehicle for the additional seats and occupants and the load carrying capacity must be able to accommodate the weight of the new seats and occupants.
Additional seats must be securely anchored to the structure of the vehicle and seatbelts must be firmly fixed according to the strength and location requirements of applicable Australian Design Rules.
Seats are divided into three categories
Category 1 - Seats for use by adults
These seats will generally change the category of vehicle from a goods carrying to a passenger vehicle, which is subject to higher safety standards.
A VASS Approval Certificate must be provided to show that the modified vehicle meets the standards for registration.
You will need to advise VicRoads of this change.
Category 2 and 3 - Seats for use by children
Category 2 seats can only be used by children up to 12 years of age and weighing less than 39kg.
Category 3 seats can only be used by children up to 8 years of age and weighing less than 27kg.
Seats in Categories 2 and 3 do not require a VASS Approval Certificate but must be fitted in accordance with the manufacturer's specifications. You should consult a VASS signatory if instructions are not available.
Category 2 and 3 seats do not change the seating description of the vehicle and therefore you do not need to advise VicRoads of the change.
For more information about adding seats, see the Vehicle standards information VSI19 - Additional or replacement seats [PDF 168 Kb].