Install an Outdoor Outlet

Power on the back porch changes everything. No more extension cords snaking through doorways to run the string lights, no unplugging the hedge trimmer halfway through the job to move the ladder. An outdoor outlet puts electricity exactly where you need it, protected from rain and wired to code. The work happens in stages: cutting into an existing circuit inside, drilling through the exterior wall, mounting weatherproof hardware outside, and making the connections that will last through twenty winters. Done right, it becomes invisible infrastructure. Done wrong, it becomes a code violation and a shock hazard. The key is understanding that outdoor electrical work operates under stricter rules than indoor installations. Every outdoor receptacle must be GFCI-protected, housed in a weatherproof box with an in-use cover, and fed through conduit if the wire runs exposed. Most jurisdictions allow homeowners to do this work without a permit if you're tapping an existing circuit, but the inspection standards remain the same. This guide walks through a surface-mount installation on wood siding, the most common residential scenario and the most forgiving for first-timers.

1. Kill power and locate the source circuit. Turn off the breaker for the indoor outlet you'll tap into, then verify it's dead with a voltage tester. Choose a source outlet on an exterior wall with accessible space behind it. Remove the cover plate and pull the outlet forward to confirm you have room to add a pigtail connection. Check that this circuit isn't already loaded with high-draw appliances.
2. Mark and drill the exterior penetration. From inside, drill a small pilot hole through the wall where you want the outdoor outlet, angling slightly downward toward the outside to prevent water entry. Go outside and confirm placement, then drill the full penetration with a 1-inch spade bit from the exterior side to prevent siding tearout. Keep the hole low enough that your weatherproof box will mount below it.
3. Mount the weatherproof box and conduit. Attach a weatherproof electrical box with lugs to the exterior wall, positioning it so the knockout aligns with your drilled hole. Cut a short length of ¾-inch PVC conduit to span from the hole to the box's top knockout. Secure the conduit with an elbow fitting and weatherproof connector, sealing the wall penetration with silicone caulk.
4. Fish and connect the new cable. Feed 12/2 UF-rated cable from the outdoor box through the conduit and wall penetration to the indoor source box. Leave 8 inches of wire inside each box. At the indoor box, use wire nuts to pigtail the new cable to the existing outlet: blacks together, whites together, grounds together. Push everything back carefully.
5. Wire the outdoor GFCI outlet. Strip the outdoor cable ends and connect to a weather-resistant GFCI outlet: black to brass LINE terminal, white to silver LINE terminal, ground to green screw. Never use the LOAD terminals unless you're protecting downstream outlets. Fold the wires into the box and mount the GFCI firmly.
6. Install the weatherproof cover. Attach an in-use weatherproof cover that closes over a plug when something is connected. These spring-loaded or hinged covers are required by code and prevent water from entering while equipment is plugged in. Gasket the cover tightly to the box before screwing it down.
7. Restore power and test the GFCI. Turn the breaker back on and press the RESET button on the GFCI until it clicks. Plug in a lamp to verify power, then press TEST. The lamp should go dark and the RESET button should pop out. Press RESET again to restore function. If the GFCI trips immediately without pressing TEST, you have a wiring error.
8. Seal all penetrations and check clearances. Run a heavy bead of exterior silicone around the conduit entry point and the box-to-wall junction. Check that no part of the installation sits in a spot where water pools or where snow accumulates against the wall. Verify the outlet is at least 12 inches above grade level.