EV chargers, ducted air con, induction cooking and heat pumps are pushing Sydney homes to the limit of single-phase supply. When three-phase is genuinely necessary, what it costs in 2026, and when you can skip it.
Most Sydney homes are fine on single phase. You genuinely need three-phase for a 22kW EV charger, ducted air conditioning above roughly 14kW, serious workshop machinery, or when your combined peak load (EV + heat pump + induction + AC) exceeds the single-phase supply. A single-to-three-phase conversion costs $6,500–$9,500 fully installed in 2026 — or $9,500–$14,000 if the network needs augmenting — plus $1,800–$3,500 for the three-phase switchboard it almost always requires. This is Level 2 ASP work end to end, and we handle the network application, metering and certification as one job.
| Factor | Single Phase | Three Phase |
|---|---|---|
| What it is | One active conductor — standard for most homes | Three actives — triple the deliverable power |
| EV charging | 7kW max — overnight charging, fine for most drivers | 22kW — full charge in a few hours |
| Ducted AC | Up to ~14kW cooling | Required above that — large homes, two-storey ducted |
| Workshop / machinery | Domestic tools only | Welders, compressors, lifts, commercial kitchen gear |
| Conversion cost | — | $6,500–$9,500 (+$1,800–$3,500 switchboard) |
| Who can do it | — | Level 2 ASP only — new service line, metering, POA and network notification |
22kW EV charging. It will never run on single phase — if fast home charging matters to you, three-phase is mandatory, not optional.
Whole-home electrification. Stacking an EV, heat pump hot water, induction cooktop and big AC on one phase means load-shedding your own house on a summer evening.
Building or renovating anyway. If walls are open and the switchboard's being touched, adding three-phase now is far cheaper than retrofitting in five years.
Granny flats and dual occupancy. Separate metering and higher combined load often make three-phase the sensible supply for the site.
A 7kW single-phase EV charger fully recharges most cars overnight. If you're not running oversized ducted AC or machinery, and you're not electrifying everything at once, single phase with a decent switchboard upgrade is thousands cheaper and completely adequate. We'll tell you straight which camp you're in — see our three-phase upgrade service and the 2026 cost guide.
Look at the main switch in your board — a wide switch spanning three poles usually means three-phase, a single-pole switch means single. Three separate actives at the service pit or attachment is the other giveaway. We confirm it in seconds during a quote.
The on-site work is typically a day once the network disconnection is scheduled. The lead time is in coordination — metering, distributor notification and, if needed, network augmentation.
No. The new service line, metering, point of attachment work and network notification are Level 2 ASP territory. A standard electrician can wire three-phase circuits inside the house once the supply exists. See Level 2 vs standard electrician.
Tell us what you're planning to run — we'll confirm whether you need three-phase, and quote the conversion end to end.