Certification is carried out by councils, in a process separate from the planning permit, to ensure your plan complies with the technical aspects of subdividing land in Victoria.
Certification is the key administrative step in enabling a subdivision proposal to proceed. It is undertaken by councils and ensures that any proposed plan of subdivision complies with the Subdivision Act, the regulations and any requirements of the planning scheme or planning permit and any matter required under section 6(1) of the Subdivision Act.
Source: The Subdivision Act User Guide by the State of Victoria