Outdoor and detached garage EV charger installs

What changes when the charger is not in the house garage

Inside an attached garage the run to the panel is short and dry. Outside, the electrician has to deal with weather, distance and soil. Each adds a line to the quote.

Weatherproof gear

Pick a charger listed for outdoor use. Check the enclosure rating on its label and the manual. Tesla’s installation manual, as one example, calls for watertight fittings where the feeder wires enter the wirebox. Sun, salt air near the coast and sprinklers all test the seals, so mount the unit above splash height and away from spray heads.

GFCI and code points

• NEC 625.40 requires each charging outlet to be on its own branch circuit, with limited exceptions.
• NEC 625.42 treats EV charging as a continuous load, so the circuit is sized at 125 percent of the charger.
• NEC 210.8 requires ground-fault protection on many outdoor outlets at dwellings. How that applies to a hardwired charger depends on the code edition and the amp rating, so the electrician checks the edition your city enforces.
• NEC 625.54 adds ground-fault protection for receptacles that feed EV chargers.

Ask the electrician which edition applies and whether the charger has built-in protection that the inspector accepts. Do not guess; the inspector decides.

Running the wire

Route	How it works	What drives cost
Surface conduit along a wall	Metal or PVC conduit on stucco or siding	Distance, number of turns, paint or patching
Attic or crawlspace	Cable in framing, then conduit outside	Access, insulation, fire blocking
Trench to a detached garage	Conduit buried to the depth in NEC Table 300.5	Length, concrete or pavers, landscaping, utilities

Trenching can double the labor on a job. Call 811 before anyone digs so underground lines are marked. A trench under a driveway may mean saw-cutting concrete, and under a patio may mean lifting pavers.

Feeder, subpanel or direct circuit

For a detached garage there are two usual layouts.

1. Direct circuit. One run from the main panel to the charger. Good when the charger is the only load and the distance is short.
2. Feeder to a subpanel. One larger run to a subpanel in the garage, then short circuits for the charger, lights and outlets. Good when you want more than one load or a second charger later. See the subpanel installation page.

A detached building normally needs its own disconnect where the feeder arrives, and the grounding rules differ from an attached garage. The electrician follows the code for the building.

Large vehicles and long driveways

Trucks and SUVs, including the Rivian R1T and R1S, often park outside, so these installs come up often. The Rivian page covers the 24 foot cord and the 60 amp circuit.

Permit and inspection

A new feeder to a detached building and a new charger circuit are both permitted work. The city may inspect the trench before it is covered, the subpanel and the final. Read the permit guide to see how Southern California cities handle it.

What it costs

As of October 2026, the typical SoCal range for a Level 2 install is $1,000 to $2,000. Outdoor and detached-garage jobs usually fall at the top or above it, because of the trench, conduit and subpanel. If the main panel also needs work, the combined range is about $3,600 to $7,500. Ask for trenching, subpanel and charger circuit as three separate lines, and check the load calculation first so you know the main panel can feed the new load.

Planning checklist

1. Measure the straight-line distance from the main panel to the charger spot, then ask the electrician for the real route.
2. Note what is on the route: stucco, concrete, tree roots, irrigation, pavers.
3. Decide on the mount: wall, post or pedestal.
4. Ask whether the run passes under a driveway that carries vehicles.
5. Confirm where the feeder will enter the detached building and where the disconnect will go.
6. Ask for the permit and the inspection list in writing.

Short runs on a back wall often take a day. Trenches and subpanels add days and a second inspection.