Licensed WA Electrician · EC9674
Three Phase Power Upgrade in Perth
A three phase power upgrade in Perth is two jobs with two bills: Western Power's change to the network, and the electrical work from your point of supply inwards. Here is how they fit together, and what moves each one.
Why the Numbers You Find Online Never Agree
Search for what a three phase upgrade costs in Perth and you will find figures that disagree with each other by thousands. Nobody is being dishonest. They are answering two different questions and not saying which one.
A phase conversion is two pieces of work with two separate bills. Western Power owns the network up to and including your point of supply, so changing a single-phase service to three phase is a change to their asset, applied for through them, and charged by them at rates they publish. Everything from the point of supply inwards is electrical contracting: the consumer mains, the meter box and switchboard, and the circuits you wanted the extra phases for in the first place.
Quote only the network charge and the job looks cheap. Quote only the contracting work and it looks like the utility does not exist. Neither is the number that leaves your account, which is why the first thing worth doing is separating the two.
Where to find the network half
Western Power publishes its own connection and supply-alteration charges. Read them at westernpower.com.au, then treat that as one of two numbers rather than the answer. JEC quotes the other one as a fixed price.
The reconciliation
Western Power's Half and the Electrician's Half
Two parties, two scopes, two bills. This is the split almost nobody spells out, and understanding it is what stops a quote looking wrong when it is not.
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What it covers
Western Power's side
The supply to your property: the connection at the pole or pillar and any network work needed to deliver three phases to it
Your side of the meter (JEC)
The consumer mains, the meter box and switchboard, and the final sub-circuits the extra phases are for
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Who does the work
Western Power's side
Western Power, or a contractor working to their network requirements
Your side of the meter (JEC)
Your licensed electrical contractor. For this page, JEC, WA licence EC9674 and EW144799
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How it is charged
Western Power's side
Western Power charges for the connection or supply alteration at rates it publishes itself
Your side of the meter (JEC)
Quoted by your contractor. JEC quotes one fixed price in writing after the assessment
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What moves the number
Western Power's side
Whether three phases already reach the pole or pillar, the route and distance, and whether network-side work is needed
Your side of the meter (JEC)
Whether the existing mains can carry three phases, and whether the board has the space or has to be replaced
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Who applies
Western Power's side
The application is lodged with Western Power, normally by your electrical contractor on your behalf
Your side of the meter (JEC)
Glen lodges it as part of the job, then coordinates the internal work around it
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What sets the timeline
Western Power's side
Western Power's process and scheduling. This is the long pole in the job
Your side of the meter (JEC)
Usually a day or so on site once the supply is available
No dollar figures are published here. Western Power's charges are public and change over time, and JEC's own figures are quoted per property after the assessment, so quoting one without the other is exactly the thing that makes every other page on this topic misleading.
What drives the size
Six Things That Decide What a Phase Conversion Actually Involves
Two houses on the same street can land in very different places on this job. These are the six things Glen is assessing before either number can be worked out.
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How far the supply has to travel
The distance from the network connection to your meter box sets the length of the consumer mains and, where the run is underground, the length of the trench. It is the single biggest variable on most properties.
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Overhead or underground
An overhead service is a different job to an underground one. Underground means trenching, conduit and reinstating whatever the trench went through, which on an established block is usually lawn, paving or a garden bed.
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Whether the existing mains can carry it
Three phases need cable rated to carry them. Older consumer mains frequently cannot, so replacing the mains between the point of supply and the board becomes part of the job rather than an optional extra.
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Whether the board has room
A three-phase switchboard is physically different to a single-phase one: a three-pole main switch, phases distributed across the circuits, and more space taken. Plenty of boards need replacing to take it, which folds a switchboard upgrade into the work.
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Whether Western Power needs to do work at their end
Sometimes three phases are already at the pole or the pillar and it is a straightforward alteration. Sometimes they are not. Which of those you are dealing with is decided by the network, not by your electrician, and it moves both the charge and the timeline.
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What you are actually powering
The reason for the upgrade sets the work after the board: a workshop supply, a ducted system, a pool, or a charger circuit. Those sub-circuits are quoted with the rest so there is one number, not a second job later.
Do You Actually Need Three Phase?
Plenty of people ask for a phase conversion when the real problem is a board with nothing left in it, or a supply that has never been balanced properly. Those are cheaper problems to fix, and Glen will tell you when that is what you have.
Where three phase genuinely earns its place: a workshop running three-phase machinery, a large ducted air conditioning system, a property already at the limit of its single-phase supply, or a household adding several big loads at once rather than one at a time.
Where it usually does not: a single home EV charger. Most Perth homes are single phase, and a single-phase supply commonly runs a 7 kW charger, which is enough to fully charge most EVs overnight. If that is the whole reason you are here, start with EV charger installation and a look at the board rather than the supply.
Check the board before the supply
A surprising number of capacity problems are switchboard problems. If your board is full, has no RCDs, or still runs ceramic fuses, a switchboard upgrade may solve what you came here for at a fraction of the work. The free safety check tells you which of the two you are dealing with.
Verified Google review
A Real Three Phase Upgrade, in the Customer's Words
“Glen took care of everything required to upgrade our property to 3 phase power. He was prompt and very easy to deal with. The crew on site were tidy and worked hard in the heat!”
Rated 5.0 from 11+ Google reviews. Read them all on Google.
How it works
From Assessment to Changeover
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Assessment
Glen looks at the point of supply, the consumer mains and the board, works out whether three phase is genuinely the answer for what you are trying to run, and tells you if something smaller solves it.
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Application and fixed price
The Western Power application is lodged on your behalf, and you get one fixed price in writing for JEC's half of the work, along with which network charge applies to your property.
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Changeover and certification
When the supply is available, the mains, meter box, board and sub-circuits are done, tested and certified. You get the compliance paperwork for your records.
One Fixed Price for the Half We Control
JEC cannot set Western Power's charge, and no electrician can. What Glen can do is tell you which charge applies, lodge the application for you, and put the contracting half in writing as one fixed price before anything starts. The workmanship carries JEC's 10-year guarantee, and JEC holds WA licence EC9674 · EW144799.
If the board is the real constraint, that job is switchboard upgrades. For commercial and strata properties, three-phase work sits under commercial electrical.
Three Phase Power Questions, Answered
How much does a three phase power upgrade cost in Perth?
There is no single figure, and that is the honest answer rather than an evasive one. The job is billed in two parts: Western Power charges for the change to their network and publishes those charges themselves, and your electrical contractor charges for the work from the point of supply inwards. Most of the numbers you find online quote one half and leave the other out, which is why they disagree so wildly. JEC quotes its half as one fixed price in writing after the assessment, and tells you which Western Power charge applies to your property so you can see both.
Do I need three phase power for an EV charger?
Usually not. Most Perth homes are single phase, and a single-phase supply commonly runs a 7 kW charger, which fully charges most EVs overnight. Three phase allows faster charging, but for a car that sits in the driveway all night the extra speed rarely earns the cost of converting the supply. Glen will say so plainly rather than sell you a phase conversion you do not need.
How long does a three phase upgrade take?
The electrical work itself is usually a day or so on site. The waiting is Western Power's part, because the network alteration runs on their process and their scheduling, not the electrician's. That is the long pole in the job, so the sensible order is to get the application lodged early and plan the internal work around when the supply becomes available.
Who lodges the application with Western Power?
Your electrical contractor normally does it on your behalf, and JEC does. Glen works out what the property needs, lodges the application, and coordinates the internal work so the changeover lands when the supply is ready rather than weeks either side of it.
Will my switchboard have to be replaced as well?
Often, yes. A three-phase board is not the same object as a single-phase one: it needs a three-pole main switch and the circuits distributed across the phases, which takes more physical space than most older boards have. Where the board has to change, JEC prices the switchboard upgrade in the same fixed quote instead of coming back for it.
Can an existing house be converted, or is three phase only for new builds?
Existing homes are converted regularly. It is more work than specifying three phase at build time, because the mains, the meter box and often the board all have to be brought up to it, but the path is well established. The assessment tells you what your specific property needs before you commit to anything.
Related Pages
Switchboard Upgrades
A three-phase supply usually needs a board that can take it. The full upgrade service, fixed price, most done in a day.
Learn more →EV Charger Installation
Before you convert the supply for a charger, see what a single-phase supply actually delivers overnight.
Learn more →Air Conditioning
Ducted and split-system work, with the electrical side handled by the same contractor.
Learn more →Book a Three Phase Assessment
Glen works out what your property actually needs, lodges the Western Power application and gives you a fixed price for the rest. Prefer to talk it through? Call 0483 930 785.
0483 930 785