Supply Separation and Subdivision Sydney
A granny flat on the same meter as the house works right up until you want to rent it, sell it, or stop arguing about the bill.
- Separate supplies and metering. Each on its own account.
- Granny flats, duplexes and subdivisions. All handled.
- Capacity assessed for both dwellings
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What Is Supply Separation?
Supply separation gives a second dwelling its own connection and its own metering, so it becomes a separate electrical installation rather than an extension of the first one.
That typically means a new or upgraded service connection, consumer mains run to the second dwelling, separate metering for each, and a switchboard in the new dwelling. Each dwelling then has its own account with its own retailer and its own bill.
The alternative is running the granny flat off the existing supply as a sub-circuit, which is simpler but leaves both on one meter.
Why Separate the Supply Rather Than Share It?
Three reasons, and they get more compelling the longer you own the property.
Billing. A shared meter means one bill and an ongoing conversation about who used what. Fine for family, awkward for tenants, and a genuine problem if the arrangement is meant to be commercial.
Tenancy. Renting out a secondary dwelling works far better when it has its own account and the tenant deals with their own retailer directly.
Capacity. Two dwellings on one original supply is exactly how properties end up with the main switch tripping. If the existing supply was marginal for one house, it will not comfortably carry two, which usually makes this a power supply upgrade as well as a separation.
There are cases where sharing is right, usually where the second dwelling is genuinely part of the same household and the supply has capacity. It should be a decision, not a default.
When Does the Granny Flat Supply Question Come Up?
Sydney's secondary dwelling boom runs straight through the post-war suburbs with large blocks: Blacktown, Mount Druitt, Campbelltown, Liverpool, right across the west and south west, and through the older parts of the south.
Those are exactly the properties where the original supply is oldest and smallest. A 1960s brick home on a big block has the space for a granny flat and frequently the least capacity to carry one, which is why the electrical scope is so often larger than owners expect and why a switchboard upgrade usually comes with it.
The earlier this is assessed the better. Finding out at the end of the build that the supply cannot carry the second dwelling is an expensive surprise at the worst possible moment.
Our Services
All your Level 2 electrical needs covered
Our team has the skills, expertise and accreditation to cover any Level 2 requirement they come across. Every service is backed by safety, quality and experience.
Power Connect and DisconnectConnect a new property to the grid, or disconnect safely for demolition and works.MeteringMeter installs, relocations and changes, with the paperwork handled.
Overhead Service LinesRepair, replace and install overhead service lines and storm damaged connections.Underground Service LinesUnderground mains installed, located and repaired, including overhead conversions.Consumer MainsInspect, repair, upgrade or install the mains feeding your switchboard.
Switchboard UpgradesAgeing fuse boards replaced with a compliant board and safety switches.We handle 23 Level 2 services in total. See the full list.
Why Choose Sydney Level 2 Electrician for Granny Flat and Subdivision Connections
Building a granny flat, splitting a block, or converting to dual occupancy? At some point the electrical question arrives: does the second dwelling run off the existing supply, or does it get its own? The answer shapes what the job costs, how long it takes, and whether you can bill the two separately afterwards.
Sydney Level 2 Electrician has been carrying out supply separation across Sydney for 15 years. We are an accredited Level 2 ASP under the NSW Government's ASP Scheme, authorised on the Ausgrid and Endeavour Energy networks. Every separation job is completed to AS/NZS 3000:2018 and the NSW Service and Installation Rules, certified with a CCEW, and covered by our Lifetime Labour Warranty. Free quotes, Sydney and the Blue Mountains, available 24/7.
How Does the Supply Separation Process Work?
Six steps, and the first is the one people skip.
Maximum demand assessment for both dwellings. What each will draw and what the combined connection needs to be. This determines everything downstream, including whether three phase power enters the conversation.
Confirm the network area and requirements. Ausgrid and Endeavour Energy run different processes for additional connections.
Upgrade the service connection where the existing one cannot carry both, which may mean work on the service line itself.
Install new consumer mains to the second dwelling at the calculated size.
Install separate metering for each dwelling and the switchboard in the new one.
Test, energise, certify. CCEW issued and the Notification of Service Work submitted.
Where we work
Level 2 electricians across Greater Sydney
We are on the road across the whole metropolitan area, from the CBD and the Eastern Suburbs out to Penrith, up to the Hills District and down through the Sutherland Shire. If you are not sure whether we reach you, call and ask.
What Does a Subdivision Change?
A full lot subdivision is a bigger proposition than a granny flat, and worth separating in your head.
With a secondary dwelling you have one lot with two dwellings on it. With a subdivision you end up with separate titles, and each needs a genuinely independent supply, independently connected. The electrical arrangement has to match the legal one.
Depending on the site and what the network can deliver, the available capacity can be the constraint rather than the wiring. That is confirmed with the distributor for the address, and it is better established before a scope is fixed than after.
Getting the Timing Right in a Granny Flat Build
Electrical supply is one of the easiest things to leave too late in a secondary dwelling build, and one of the most disruptive when you do.
Two practical points. First, the assessment belongs at design stage, because the answer affects where the switchboard goes, where the mains run and what the budget needs to be. Second, the distributor's process takes time and does not compress because the builder is finishing.
If the build needs power before the permanent connection exists, that is temporary builders supply. If the existing supply has to come off during works, see power connect and disconnect. For larger projects, new development connections covers the full scope.
Get Your Supply Assessed Early
Before the slab goes down, find out what the property can carry and what separation involves.
Call 0485 824 714 or send an enquiry describing the property, what you are building and roughly when the original house was built, and we will quote free. We will assess capacity, explain what separation involves on your network, and price it properly. Sydney and the Blue Mountains, 24 hours.
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How it works
A simple process for excellent service, right when you need it.
01Contact our team
Reach out by phone, email or the contact form to start the process.
02Discuss the details
Tell us what you need, including property information and any specific concerns.
03Assessment and quote
We schedule a visit or request photos, then provide a detailed quote and timeline.
04Confirmation and booking
Once the quote is approved we book your job at a time that suits you.
05Job completion
We arrive on time with every tool needed to finish the work properly.
06Final check and payment
We inspect and test the work before finalising the paperwork and compliance.
Network checker
Are you on Ausgrid or Endeavour Energy?
Every Level 2 job is lodged with the network that owns the wires in your street, and the paperwork differs between the two. Type your suburb and we will tell you which one you are on. We are accredited for both, so either way you are covered.
A guide only. Network boundaries can split a single street, so we always confirm the network before we lodge anything.
FAQs
Supply Separation and Subdivision questions, answered
The things people ask us most about supply separation and subdivision in Sydney. If yours is not here, call and ask.
Does a granny flat need its own supply?
It depends how it is being used and approved. A separately occupied dwelling generally needs its own metering, while an extension used by the same household often does not. The approval conditions usually settle it.
Can two dwellings share one meter?
Not where they are separately occupied or tenanted, because there is no fair way to bill them and it does not meet the rules. Separation is what makes each dwelling independently metered and billed.
What does supply separation actually involve?
New consumer mains to the second dwelling, a compliant switchboard for it, separate metering, and the application to the distributor to establish the new connection point. On a subdivision it also has to align with the lot boundaries.
When should this be planned on a subdivision?
At design stage, not after the build. Where the mains run, where the meters sit and where the connection point lands all affect the site layout, and retrofitting is far more expensive than designing it in.
Can I keep one account and on-charge the tenant?
That is an embedded network arrangement and it carries regulatory obligations most small owners do not want. For a typical granny flat or duplex, separate supplies is the simpler and cleaner outcome.
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