People shop for the unit first, which is natural, because it is the part with a price tag and reviews. But the charger is the most standardized element of the project. What varies from house to house, sometimes enormously, is the electrical infrastructure it has to attach to. Two identical cars in two identical neighborhoods can produce very different installations depending on the age of the house, where the panel sits, and what else has already been added to the service.
This is worth internalizing before you get quotes, because it explains why numbers vary and why an electrician who has not seen your panel cannot give you a real answer. The useful frame is that you are not buying a charger installation. You are asking whether your home's electrical service can absorb a substantial new load, and then how to get that load from the panel to where the car sleeps.
Home charging is a continuous load, meaning it runs at close to full draw for hours rather than in the short bursts most household equipment produces. A clothes dryer finishes. A charger keeps going most of the night. That distinction has real consequences for how the circuit is sized and how much headroom your service needs to have available. A load calculation accounts for all of it: the existing loads in the house, the size of the incoming service, and what the charger adds on top when it runs.
The outcome is one of three answers. There is comfortable room, and the project is a new circuit. There is room but not much, and the project may include load management equipment that prevents the charger from running simultaneously with another large load. Or the service is already at its limit, and adding a charger means addressing capacity first. None of those answers is bad news exactly, but they are very different projects, and the calculation is what tells you which one you are in.
The second variable is geography. A panel on the garage wall a few feet from the parking spot makes for a short, simple circuit. A panel in a basement on the opposite corner of the house means a long run through finished space, which means fishing wire, cutting access, and patching afterward. A detached garage adds a feeder and often a trench. None of this is exotic work, but it is where the labor lives.
The other half of geography is the car itself. Charge ports sit in different places on different vehicles, and cable length is finite. It is worth standing in the garage with the car parked the way you actually park it and thinking about where the cable will hang, whether it crosses a walkway, and whether you will still find it convenient in February with your hands full. Mounting height and position are easy to get right in advance and annoying to change later.
A full or undersized panel is one of the most common findings, particularly in homes that predate the current wave of electrification. It does not mean the answer is no. It means the project has an additional step, and there are several ways through. A subpanel can add breaker positions when the service itself has headroom but the panel is out of room. Consolidating or relocating existing circuits sometimes frees space. Load management equipment can let a charger coexist with other large loads by ensuring they do not run at full draw simultaneously.
When none of those is sufficient, a service upgrade is the honest answer, and it is worth considering in the context of everything else you might add. Heat pumps, induction ranges, hot tubs, and shop equipment all compete for the same capacity. If you expect more than one of those over the next several years, sizing the service once for all of it is a better plan than upgrading twice.
A new circuit of this size is typically permitted work, and your city or county building department is the authority on what applies where you live. It is worth doing properly rather than around, and the reasons are practical rather than bureaucratic. An inspection is a genuine second look at a circuit that will operate at near-full load for hours at a time, which is exactly the kind of work where a marginal connection eventually shows itself. The permit record also follows the house, which matters at resale and can matter to your insurer.
After it is energized, test it the way you will use it: charge the actual car at full rate for a sustained session rather than plugging in for five minutes. Anything marginal in the circuit tends to reveal itself under sustained load. Note where the breaker is and label it clearly. If the unit or the surrounding wall is ever warm to the touch, or the breaker begins tripping during charging sessions, that is worth a call rather than a shrug.
The variable is the run, not the unit. A short circuit from a nearby panel in an open garage is a straightforward job. A long run through finished walls, a trench to a detached garage, or panel work in the same visit extends it considerably. Permit and inspection scheduling in your jurisdiction also shapes the calendar more than the labor itself does.
In most places, yes, because you are adding a new circuit of significant size. Requirements vary by city and county, and your local building department will tell you exactly what applies. Skipping it is a poor trade: the inspection is meaningful on a circuit designed to run at near-full load for hours, and the permit record stays with the house.
Both are common and the choice has real consequences. A receptacle makes the unit easier to swap or take with you, while hardwiring is typically required or preferred for certain units and outdoor installations, and it removes a connection point from the equation. The right answer depends on the specific charger, the location, and what your jurisdiction requires.
Overload, short circuit, or ground fault: how to read what a tripping breaker is telling you, and when to stop resetting it. Electric 801, 801-644-9000.
Read the guide →Knob-and-tube, aluminum branch wiring, two-prong outlets, and undersized panels in older Wasatch Front homes, explained plainly. Call 801-644-9000 for help.
Read the guide →Get the fault traced properly. There is no fee to be matched with an electrician.
Request an ElectricianA few details about what is happening and when is enough to point you in the right direction.