How to Safely Add Electrical Outlets to Your Garage

Garage wiring is the backbone of any serious workshop, yet most builders install the bare minimum number of outlets required by code. When you find yourself relying on daisy-chained extension cords to run your saw or charge your tools, it is time to expand your reach. Adding outlets doesn't require tearing out drywall if you use surface-mounted raceways, which turn a messy wiring job into a clean, professional-looking shop setup. Done well, this project organizes your power where you need it most, keeps cords off the floor, and adheres to strict safety protocols for damp environments. We will be using metal conduit to protect the wires from physical impact, which is a standard necessity in a high-traffic garage. Keep your focus on tight connections and proper grounding, and you will have a safer, more functional space by the end of the weekend.

  1. Kill Power First. Turn off the power to the garage circuit at your main electrical panel. Use a non-contact voltage tester on your existing outlet to confirm the power is truly off before removing any faceplates.
  2. Plumb Every Box. Measure and mark the wall locations for your new metal junction boxes. Secure the boxes directly to the studs or use appropriate wall anchors if installing on masonry, ensuring they are level and spaced evenly.
  3. Run Conduit True. Measure and cut your EMT conduit to span the distance between boxes. Secure the conduit to the wall using one-hole straps, ensuring a firm fit into the box connectors.
  4. Thread Wire Through. Feed your 12-gauge THHN wire through the conduit runs from your source box to each new outlet location. Leave at least six inches of extra wire at every box for easy connections.
  5. Bond Ground Wires. Strip the insulation from the wire ends and connect them to the GFCI receptacles: black (hot) to brass, white (neutral) to silver, and bare copper to the green ground screw. Ensure the connections are tight and tucked neatly into the box.
  6. Test Every Outlet. Attach the faceplates, restore power at the breaker panel, and use a circuit tester to verify correct wiring and ground integrity. Check that every new outlet trips the GFCI when tested.