Why is my garage without power?

A garage power outage is more urgent than it looks when it takes out a freezer, garage door opener, workbench tools, or EV charging receptacle. The cause is often outside the garage: a GFCI in the house, a weather-exposed junction, a breaker feeding a detached garage, or a buried cable fault between buildings.

Start with water, GFCIs, and the breaker before you reset anything

Start by checking for water entry and tripped protection, because a garage circuit often includes exterior equipment and moisture-prone devices. Do not keep resetting a breaker or GFCI if you see water in a box, a wet plug, a dripping conduit, a scorched receptacle, or a burning smell.

Before touching anything, unplug the loads you can reach safely: freezer, opener, battery chargers, compressor, heater, tools, EV cord set, and any extension cords. Then look for the reset point. Many garage receptacles are GFCI-protected by a device that is not in the garage at all.

Common reset locations include:

• A GFCI receptacle in the garage near the door or workbench
• An exterior GFCI outlet on the same wall
• A basement, mudroom, laundry, or utility-room GFCI upstream of the garage
• A GFCI breaker or combination breaker in the main panel
• A small subpanel inside a detached garage
• A receptacle above the garage door opener, especially if it shares protection with other outlets

Press reset only once after confirming the area is dry and unplugged. If it trips again immediately, stop. The GFCI is doing its job. Repeated resets can mask a fault in a wet outlet, damaged cable, or connected appliance.

If the breaker is tripped, move it fully to off and then back to on one time. A breaker handle can sit in the middle and look partly on. If it will not hold, or it trips as soon as a freezer or opener starts, the problem needs diagnosis rather than more resetting.

For a similar room-by-room issue inside the home, see why one room lost power. A garage adds moisture, exterior wiring, and buried feeders, so the troubleshooting is not identical.

If the garage is detached, check the feeder and subpanel path

If the garage is detached, the fault may be anywhere from the house panel to the underground or overhead feed, then into the garage disconnect or subpanel. That makes detached garage troubleshooting different from a simple dead outlet.

A detached garage may be supplied by:

At the garage, look for a small breaker panel or disconnect. If there is a subpanel, check whether its main breaker is on and whether individual breakers are tripped. Do not remove the cover. A dead subpanel can still have energized parts inside if one conductor remains live, and a loose neutral can create strange voltage readings.

Specific detached-garage clues matter:

• The garage door opener is dead, but lights still work: the opener receptacle or GFCI leg may be the issue.
• Lights and outlets are all dead, but the house is normal: suspect the feeder breaker, underground feed, or garage subpanel.
• Power fails after rain or snowmelt: suspect water entry, exterior boxes, underground conduit, or a wet device.
• Power fails when the compressor, table saw, freezer, or heater starts: suspect overload, voltage drop, or a failing motor load.
• A breaker trips only when an EV charger or welder is used: the circuit may be the wrong size or not dedicated for that load.

Underground garage feeds fail when a cable is nicked during landscaping, conduit fills with water, frost movement stresses a joint, or an exterior box loses its weather seal. These are not reset-button problems. They require testing for continuity, insulation damage, grounding, and proper overcurrent protection.

If you are planning a new or upgraded feed instead of repairing an old one, this cost guide on running power to a garage explains the scope items that change the job: trenching, panel space, load, distance, and finish repair.

Overloads are common when a garage becomes a workshop, freezer room, or EV charging spot

Overloads are common because many garages were wired for lights and a few receptacles, not a freezer, compressor, opener, space heater, battery chargers, and car charging at the same time. The breaker trips because the circuit is carrying more current than it is designed to carry, or because one appliance has a fault.

A typical pattern is simple: everything works until the compressor starts, the freezer cycles on, or someone plugs in a heater. Then the garage goes dead. Another common pattern is nuisance loss after adding a larger tool or a plug-in EV cord set to an old shared circuit.

Do not solve a garage overload with extension cords, power bars, or a larger breaker. The breaker size must match the conductor and the circuit design. Increasing the breaker without correcting the wiring can overheat the cable inside finished walls, underground conduit, or garage framing.

When a garage needs more capacity, the safer fix is usually one or more dedicated circuits. A regular 20A dedicated circuit in the GTA is typically in the $250–$500 range when the route is reasonable and wall access is straightforward. Heavier 30A–50A circuits for larger equipment, hot tubs, dryers, ranges, or EV-type loads generally fall in the $400–$900 range for the circuit run itself, depending on distance and access. Any actual repair or upgrade should be quoted in writing after checking the panel, route, and load.

Garage loads that often deserve their own circuit include:

• Freezer or refrigerator, especially if losing power would spoil food
• Garage door opener when the existing receptacle is unreliable or shared awkwardly
• Compressor, table saw, dust collector, welder, or large charger
• Heat source, if it is a permanent hardwired unit or a high-draw appliance
• EV charging equipment, which should not be treated like a casual garage plug

If a circuit has been repeatedly overloaded or modified, we inspect the wiring rather than just replacing devices. Heat can loosen terminations, damage receptacles, and weaken insulation. Where a new route, feeder, or circuit is needed, garage wiring and rewiring is the correct repair path, not another reset.

Call an electrician when the fault repeats, affects a feeder, or protects important loads

Call a licensed electrician when the GFCI or breaker trips again after one reset, when water is involved, when a detached garage subpanel is dead, or when the outage affects a freezer, opener, EV charging, or tools you need the same day. Those symptoms point to a real fault, not a minor inconvenience.

A proper garage power diagnosis checks more than whether a breaker is on. We test the dead circuit under safe conditions, identify whether the loss is on the hot, neutral, or grounding path, verify GFCI protection, inspect exterior-rated boxes and covers, and check the feeder or subpanel arrangement. If the garage is detached, we also look at the transition points: house panel, exterior wall penetration, underground conduit, pull box, garage entry, and subpanel bonding/grounding arrangement.

ESA notification may be required when the repair becomes new wiring, a new feeder, a new subpanel, or a circuit addition. City Power Electrical Services is a Licensed Electrical Contractor, ECRA/ESA #7015314, and we file ESA notifications where required, provide written estimates, and offer 24/7 emergency service from our North York base for Toronto and the GTA.

Call sooner if any of these are present:

• Water inside a receptacle, junction box, conduit, or subpanel area
• Burning smell, melted plug, buzzing, or visible heat damage
• Garage power fails after rain, snowmelt, or irrigation use
• A detached garage is fully dead while the house still has power
• The opener is dead and the vehicle is trapped inside
• A freezer or sump-related device is without power
• Breaker trips as soon as one specific appliance is plugged in
• Someone has added unpermitted wiring, extension cords, or makeshift splices

If the problem is wider than the garage, compare symptoms with why only your house is without power. If it is limited to one branch of the home and not the garage feed, half-house power loss may point to a different service or panel issue.

The main rule is simple: one safe reset is reasonable after confirming everything is dry and unplugged. Repeated trips, outdoor moisture, detached-garage feeders, and overloaded workshop circuits need testing before power is restored.