Mains upgrade cost in Sydney — the 2026 pricing guide

Single-phase 63A to 100A upgrade — most common Sydney job: $2,800–$5,500 fully installed. Covers the new consumer mains cable from meter to switchboard, POA re-termination, Ausgrid notification, metering coordinator fees, testing and CCEW.

Single-phase with meter relocation (renovation, driveway change, heritage façade): $4,500–$7,500. Adds a new meter box, cabling run and often a compliance-driven switchboard upgrade at the same time.

Single to three-phase conversion: $6,500–$12,000 depending on cable run, whether the service line needs replacing from the pit or pole, and whether Ausgrid needs to bring three-phase into your street. Almost always paired with a new three-phase switchboard.

Emergency service line replacement after storm damage: $2,200–$4,500 for a like-for-like replacement, more if the POA bracket, meter box or mains cable also need renewing.

Single vs three-phase — three-phase always means more cable, more metering equipment, and often a network augmentation fee. It's not just 3× the material — it's usually 2–3× the total install cost.

Cable run length — a meter box next to the switchboard is 3 metres of tails; a detached meter box at the front fence with a switchboard at the rear of a long block is 15–25 metres of trench + cable + reinstatement.

Existing meter box condition — an old asbestos-cement enclosure needs licensed removal and disposal before we can re-mount the new metering. Budget +$400–$900 if asbestos is confirmed.

Ausgrid contestable/non-contestable classification — most residential upgrades are non-contestable and use standard fees. Contestable jobs (usually multi-unit developments, HV work) need a formal design and cost more in admin.

Extras bundled in the same outage — surge protection ($120–$220), a switchboard upgrade ($1,800–$3,500), an EV-charger-ready subcircuit ($180–$260) are all materially cheaper to do while the power is already off.

Step 1 — site assessment. We inspect the point of attachment, mains cable, meter box, switchboard, and confirm the load calculations. If a switchboard upgrade needs to happen at the same time we scope both in one visit.

Step 2 — paperwork lodged. Level 2 Notification, contestable/non-contestable forms, and metering coordinator submission all go to Ausgrid. Typical turnaround is 5–10 business days for the outage window to be confirmed.

Step 3 — planned outage day. Power isolated at the network, service line and/or mains cable replaced, new metering installed and commissioned, POA re-terminated, everything tested to AS/NZS 3000.

Step 4 — reconnection and certification. Notification of Service Works submitted, CCEW issued to you, and the metering coordinator activates the new NMI. Power back on, all paperwork in your inbox before we leave.

Adding an EV charger and a heat pump, or two EV chargers, or a 22kW three-phase EV charger on an existing single-phase supply.

Ducted air conditioning + induction cooktop + heat pump hot water added in a renovation — the combined peak load usually exceeds 63A.

Building a granny flat or secondary dwelling that needs its own NMI and metering.

Storm has damaged the service line, POA bracket or meter box — often a Level 2 make-safe emergency.

Ausgrid has issued a defect notice on your point of attachment or consumer mains after an inspection.

Old private power pole is rotten, leaning, or has been flagged by the arborist during tree work.