Three-phase power lets some cars charge at 11 kW or, less often at home, 22 kW AC. Most UK houses are single-phase and charge at about 7 kW, which still replaces a normal day's driving overnight. A three-phase upgrade means the network operator bringing more supply to the property, a new cut-out arrangement, and board work. It is a connection project, not a charger accessory.
How three-phase upgrades for home EV charging moves the job
Costs vary from a manageable service alteration to a five-figure reinforcement quote. Get the network offer in writing and only then choose the charger. A 7 kW install that you do now is not wasted if you later upgrade: it may be replaced, so do not pretend it is a deposit on three-phase.
What goes wrong with three-phase upgrades for home EV charging
The mistake is buying an 22 kW wallbox 'for the future' on a single-phase cut-out. It will not deliver 22 kW. Another mistake is assuming the street can spare three-phase because a new estate nearby has it.
Point at three-phase upgrades for home EV charging in the pack
The written plan should separate network costs, your electrician's costs, and the charger. Do not pay the installer for a network offer they do not control.
Three-phase upgrades for home EV charging
It is worth pricing if you already have three-phase plant, a workshop, a heat pump design that needs it, or a car and a duty cycle that genuinely outgrow 7 kW. It is rarely worth it for a plug-in hybrid or a small city EV.
- 7 kW covers most overnight home use
- 11 kW needs three-phase and a capable car
- The network quote comes before the charger
- Plug-in hybrids rarely justify the upgrade
Three-phase upgrades for home EV charging: questions for the first visit
Ask the operator for a connection budget before you buy a 22 kW charger. The charger is the cheap part if the cable in the road has to change.
Frequently asked questions
How fast is 7 kW in miles?
Roughly 25 to 30 miles of range per hour for many cars, depending on efficiency. That is a full commute for most people overnight.
Can I get three-phase for a home battery too?
Sometimes one upgrade serves a workshop, heat pump and charger. Ask for a single connection design rather than three separate fantasies.
Will the DNO refuse?
They can charge for reinforcement or offer a lower capacity. A refusal is a design fact, not an insult.
Does a 22 kW charger need its own application?
Any large load needs the proper notification or application. 22 kW is not a domestic afterthought.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local EV Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.