Separate Electricity Meter for a Granny Flat: Australian Costs (2026)

What does a separate electricity meter granny flat cost in Australia? In 2026, budget about $1,200–$3,500+ for a sub-meter or dedicated electricity meter when the switchboard has spare capacity. Long cable runs, driveway trenching, or a main service upgrade can push electrical work toward $5,000–$8,000+. Use the metering cost estimator for a ballpark before you get quotes.

Separate electricity meter vs shared bill

If the flat will be rented to tenants, a separate meter (or a clear sub-meter arrangement) reduces arguments over heating and air-con. Estimated percentage splits of a shared bill are a common source of tenancy disputes; check your state’s residential tenancy guidance before you rely on informal splits.

Family-only use can share the main bill with a written agreement. But it’s still worth installing an electricity meter during the build if you might rent later: retrofitting after landscaping is finished is usually more expensive.

Still designing the dwelling? Compare 1-bedroom floor plans or 2-bedroom layouts. Queensland builds: see Brisbane granny flat rules. For a full project budget, use the cost calculator and the approval pathway wizard.

2026 cost breakdown

The meter hardware is only part of the invoice. A Level 2 Authorised Service Provider (ASP) quote usually includes labour, board work and any trenching: and that’s before you hit driveway crossings or an asbestos switchboard.

• State and distributor: NSW and VIC quotes are often highest; Ausgrid, Endeavour, Essential Energy and Victorian DNSP rules differ.
• Access: Tight sites and driveway crossings add labour.
• Existing gear: An asbestos panel or undersized street service is the usual budget-breaker.

Sub-meter vs own NMI

A cheaper sub-meter ($500–$1,000 range in many quotes) tracks usage while the bill still lands with you: you then recharge the tenant. A separate National Metering Identifier (NMI) lets the tenant deal with a retailer directly. For rental, a separate NMI is cleaner legally and administratively: you won’t be chasing usage percentages every quarter.

If the tenant is family, a sub-meter can still be enough. But if you plan to advertise on the open market, a separate NMI is the cleaner paper trail. Don’t wait until the first bill fight to decide.

Installation steps

1. Get two or three Level 2 ASP quotes with site plans attached.
2. Site assessment of the existing switchboard and cable route.
3. Paperwork to the distributor for a new NMI where required.
4. Physical works: board, cabling, trenching.
5. Meter commissioning by the provider or contractor.
6. Certificate of Compliance for Electrical Work (CCEW) from the electrician.

Start early in the build: two to six weeks is a common end-to-end window, and distributors don’t always move fast in peak season. Approvals overview: granny flat approval guide.

Why landlords still pay for it

• Fewer bill disputes and clearer tenancy agreements.
• Better rental appeal: tenants like controlling their own account.
• Cleaner solar feed-in allocation if panels go on the flat later.
• Stronger sale story: the flat is rental-ready. See do granny flats add value.

The owner pays for installation and electrical infrastructure. Tenants pay ongoing usage on their own account once a separate NMI is live. If you’re comparing quotes, ask whether trenching through a finished driveway is included. That’s the line item that turns a $2,000 metre job into an $8,000 week.

So get the ASP on site before landscaping. Retrofit after pavers is the expensive version of the same job.

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