No — extension cords should never be used as permanent power for a shed, garage, or any outbuilding. Extension cords are rated for temporary use only and aren’t designed to carry continuous loads through walls, underground, or outdoors. Doing so is a serious fire risk and is prohibited by the National Electrical Code.
Why a real circuit matters
- Dedicated wiring is sized for the actual load
- Proper conduit and burial depth protect against damage
- GFCI and weatherproof outlets keep you safe outdoors
- Permitted work is insured and code-compliant
If your shed or garage needs power, the right answer is a properly installed circuit run in conduit (or buried direct-burial cable) with a sub-panel if you’re powering multiple tools. We handle full shed and outbuilding wiring, including electrical wiring, outlets, and outdoor lighting.
