How to Install Surface-Mounted Electrical Outlets in a Garage

Garage power often feels like a design afterthought, leaving you juggling heavy-duty extension cords just to run a power tool or a shop light. Adding outlets directly into your garage workspace transforms the utility of the area, turning a cold storage zone into a functional shop. By using EMT conduit and surface-mounted boxes, you avoid the headache of fishing wire through finished drywall while keeping your new circuits protected against the accidental bumps and scrapes of a working garage. Done well, this project looks like a professional installation, not a temporary patch. You will be using metal conduit secured with straps to keep the wiring rigid and safe. The goal is to create a clean, accessible power run that follows the structural lines of your walls, making the garage feel intentional and ready for any project you throw at it.

  1. Kill the Power First. Locate your main service panel and flip the breaker for the circuit you intend to tap into. Use a non-contact voltage tester on the existing outlet or junction box to confirm the power is off before removing any covers.
  2. Position Your Power Points. Mark the locations for your new utility boxes along the garage wall studs or masonry. Use a level to ensure they are aligned, then screw the metal boxes directly into the wall surface using the provided mounting tabs.
  3. Create Your Wiring Highway. Measure and cut your EMT conduit to span the distance between the existing box and your new outlets. Use a conduit bender to create smooth curves for any corners, then secure the conduit to the wall using one-hole straps every three feet.
  4. Thread Power Through. Feed your THHN wire (black, white, and green) through the conduit system from the power source to the final outlet box. Use a fish tape if the run is long or contains multiple bends.
  5. Wire Your Outlets. Strip the ends of the wires and attach them to your GFCI or standard outlets: black to gold (brass) screw, white to silver screw, and green/bare to the green ground screw. Fold the wires neatly into the box and screw the outlet into place.
  6. Verify Everything Works. Install the cover plates onto your new boxes. Turn the circuit breaker back on and test each outlet with a simple plug-in circuit tester to confirm the wiring is correct.