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Question DetailsAsked on 2/9/2015

Install 240 volt 20 amp outlet in garage 3 feet from power panel

Power panel is 100 amp. 240 volt 20 amp is for an electric car charger. Can it be done in existing panel & approx cost ?

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1 Answer


Depends on what other demands you have in the house - if a mostly electric appliance house, and quite likely if electric furnace or hot water heater, you may need to upgrade your service capacity and upgrade your breaker panel - or install a secondary panel. You can find a LOT of prior questions with responses on upgrading breaker/service capacity in the Home > Electrical link in Browse Projects, at lower left. Upgrades typically run in the thousand or two range assuming your wiring is not totally outdated and incoming power company line has adequate capacity (normally does if house is less than about 60-70 years old), can add from zero to several thousand if service line upgrade is needed. Installing a secondary panel in the $500-1000 ballpark range IF the incoming line has the capacity.

If mostly a gas fired house, might well be able to handle it with 100A service - your electrical contractor can check it out and tell you what can and cannot be done. If your panel has the capacity (or is upgraded to give it), then typically in the $300-500 range depending on length of run to where the outlet needs to go, depending on if running the wiring to the outlet through bare studs, in surface mounted conduit, or breaking into drywall to run the wires in the walls. Plus if breaking into the walls, several hundred $ more typically for repair and repainting. In your case, due to very short run, probably near the $300 range for the outlet - NOT including the charger.

Running the wire up into the house (typically in hall) so it can be turned on and off from the living space (like when you get up or go to bed) without going to the garage can cost from a hundred $ or so more on up depending on additional run length and drywall cutting issues again. Putting in a charger (for vehicles which do not have the charger built-in) with charge monitor and timer can add another $500 and on up depending on brand - many are $1000 range, especially OEM ones or ones that have timer to keep use in the cheap power rate time of night. (And yes, believe it or not, at least with some manufacturers the charger is optional equipment, not included with the car when you buy it).

Answered 4 years ago by LCD

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