Home vs Public Charging: Which You Actually Need

Almost every argument about whether electric cars are cheap to run is really an argument about where the person doing the arguing charges. Home charging and public charging are different products at different prices, and which one you depend on matters more than which car you buy.

The size of the gap

Charging at home on a standard domestic tariff is the cheapest electricity most people can buy. Charging at home on a dedicated EV tariff during the off-peak window is dramatically cheaper still — suppliers offer a deeply discounted overnight period in exchange for a higher daytime rate, and an EV is the ideal load to shift into it.

Public rapid charging commonly costs several times the off-peak home rate. Part of that is hardware, land and grid connection costs; part of it is the VAT difference, since domestic electricity is taxed at 5% and public charging at 20%.

In pence-per-mile terms, a driver doing all their charging at home off-peak might be running at around 2 to 3p per mile. A driver doing all of it on rapid chargers might be at 20p or more. Same car, same miles, an order of magnitude apart.

Is a home wallbox worth installing?

If you have off-street parking, almost certainly yes, for three reasons that compound.

Speed. A 7.4kW wallbox adds around 25 miles of range per hour against roughly 8 from a three-pin granny cable. Overnight, that is the difference between a full battery and a partial one.

Tariff access. Most EV tariffs are built around a smart charger that can be scheduled or controlled by the supplier. Without one you may not qualify for the cheapest rates at all — which is often the larger saving, bigger than the speed.

Safety and durability. A wallbox is a fixed installation with proper earthing and protection, designed for hours of continuous high current, night after night. A domestic socket is not designed for that duty cycle.

Installation typically runs into several hundred pounds depending on the distance from your consumer unit and whether it needs upgrading. Grant support has changed repeatedly over the years and now targets particular groups — renters and flat owners with off-street parking, and landlords — rather than owner-occupiers with houses. Check the current government scheme before assuming either way.

The payback arithmetic is usually short for anyone doing average mileage, because the saving applies to every kWh you put in the car for as long as you own it.

If a wallbox is not an option yet

A three-pin granny cable will charge a car, and for low-mileage drivers it is genuinely sufficient — 8 miles of range per hour over twelve hours is around 96 miles, which covers most people's daily driving several times over.

The rules if you use one: plug directly into a wall socket, never an extension lead or a multi-way adapter; have an electrician check the socket and its circuit if the house wiring is old; never run the cable coiled on a reel; and do not run it across a public footpath, which is both a trip hazard and, in most places, not permitted.

No driveway: the realistic strategy

Around a third of UK households have no off-street parking, and the advice usually given to them — "just charge at home overnight" — is useless. Here is what actually works.

Check for on-street charging on your own street first. Lamppost chargers from operators like ubitricity, and kerbside units from Char.gy and Connected Kerb, are spreading rapidly through local authority schemes. They are slow, typically 3 to 7kW, and that is fine — you are asleep. Search your postcode on this site before you conclude there is nothing.

Ask your council. Many local authorities run a request scheme where residents can nominate a street for a charge point, and installations are frequently driven by exactly these requests. It is a form and it costs nothing.

Work out your destination charging. A 7kW post at your workplace, gym, or the supermarket you use weekly can quietly cover most of your charging if you use it consistently. Slower and cheaper while you were going to be there anyway beats faster and dearer on a special trip.

Use rapid charging deliberately, not by default. One planned rapid session a week at a known-good hub, timed with something else you were doing, is a very different experience and cost from panicked top-ups.

The honest summary for drivers without a driveway is that an EV still works and still beats petrol on running cost, but the margin is thinner and it takes more deliberate habit. It is worth being clear-eyed about that rather than discovering it in month two.

Workplace charging is underrated

If your employer has charge points, they are often the best deal available — sometimes free as a staff benefit, frequently at or near cost, and always during hours when the car is parked anyway. For a commuter, workplace AC charging can functionally replace home charging entirely.

If your employer does not have them, there is a grant scheme aimed at exactly this, and workplace charging is an unusually cheap staff benefit to offer. It is worth raising.

The short version

If you have a driveway: fit a wallbox, get an EV tariff, charge overnight, and use public charging only on journeys. Your running costs will be low enough that the question stops being interesting.

If you do not: find your nearest on-street or destination charging, build it into an existing routine, and treat rapid charging as a considered choice rather than a default. Use the map on this site to see what is genuinely within walking distance of home and along the routes you already drive.