Metering Guide
Does a Granny Flat Need a
Separate Meter?
Determining whether your granny flat needs its own electricity meter depends on how the space will be used, who will be paying the bills, and what the local electricity distributor requires.
Legal and billing considerations
There is generally no single legal requirement across Sydney that a granny flat must have a separate meter. If a family member is living in the secondary dwelling and electricity costs are shared, a single meter for the entire property may suffice in many cases. However, if the granny flat is leased, you should check relevant tenancy regulations or obtain advice regarding the charging of utilities. Without a separate meter, calculating usage can be complex.
National Metering Identifier (NMI)
When we talk about a "separate meter", we usually mean a separate National Metering Identifier (NMI). This can provide the granny flat with its own distinct account, allowing the occupant to choose an energy retailer. Achieving a secondary NMI on a single residential lot triggers specific compliance rules from the distributor (such as Ausgrid or Endeavour Energy), which requires electrical assessment.
Network rules and secondary supply
Adding a second meter can involve upgrading your switchboard and potentially your consumer mains to handle the combined maximum demand. The local network provider assesses the secondary metering arrangement. Engaging an electrician early can help outline the site's capability.