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EV charger in a detached garage
Distance is the cost. A detached garage adds a trench, a feeder and the rules for a separate building.
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Written by HyreElectrical Research Desk Primary-source research and fact checking
The short answer
An EV charger in a detached garage is a job for a licensed electrician: power reaches the garage by a buried or overhead circuit or feeder, the building gets a disconnect and grounding electrodes where required, and the charger is installed on its own circuit.
Outdoor charger installs follow the same rules plus a charger rated for outdoor use.
Single circuit or feeder
A charger alone can be fed by one dedicated circuit. If the garage also needs lights, outlets or tools, a feeder to a subpanel is usually better. See running power to a detached garage.
NEC Article 225 requires a disconnect at the separate building. NEC 625.40 puts EV supply equipment on its own branch circuit, and 625.41 sizes the overcurrent protection at no less than 125% of the charger’s maximum load because charging is continuous.
Long runs and voltage drop
Long distances call for heavier wire to keep voltage drop in check. The voltage drop calculator shows why.
Trench depth depends on the wiring method; call 811 before digging.
Permit, time and what changes the price
Expect a permit, often with a trench inspection before backfill.
Price drivers: trench length, conduit, wire size, subpanel, electrode, charger mounting outdoors. No price ranges are published here until we hold enough sourced, dated quotes; see cost guides.
Outdoor charger notes
Use a charger rated for outdoor installation and mount it to keep the cable off the ground. Weather and sun shorten cable life.
Check the license on your state board before anyone starts: how to check an electrician license.
Using the garage for more than charging
Many owners later add a freezer, a heater, a compressor or a second charger. Listing those loads now lets the electrician size one feeder for all of them. A second trench later disturbs the yard twice.
If the house service is near its limit, the electrician may suggest a load-managed charger in the garage so the feeder and service stay within their ratings.
What a fair written quote lists
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Questions
Can I run an EV charger to a detached garage?
Do I need a subpanel?
Does a detached garage need ground rods?
Can the charger go outside?
Written and audited by
HyreElectrical Research Desk
Primary-source research and fact checking
We read the model code, the federal safety notice, the municipal fee sheet or the utility tariff ourselves, and we publish the figure with the document it came from and the date we retrieved it.
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This page is general information, not a diagnosis or a quote. Code rules vary by the NEC edition your state or city adopted and its local amendments.