Adding any electrical service to a shed — a single outlet, a single light, a sub-panel, anything — requires an electrical permit in every U.S. state. There are no exemptions for shed electrical work. Additionally, electrical work in a shed almost always triggers a building permit for the shed itself, even if the shed was originally small enough to be permit-exempt.
Why Does Running Power to a Shed Require a Permit?
Electrical work is regulated because improper electrical installations are one of the leading causes of residential structure fires in the United States. Electrical permits exist to ensure that:
- Wiring is properly sized for the load it will carry
- Connections are correct and secure
- Circuit protection (breakers or fuses) is properly rated
- Grounding and bonding meet NEC (National Electrical Code) standards
- Outdoor and wet-location wiring uses appropriate cable types and conduit
- A licensed inspector verifies the work before it's covered or energized
What Does a Shed Electrical Permit Involve?
Step 1: Pull the Permit
Either you or your licensed electrician applies for an electrical permit from your local building department. The application describes the scope of work: how the power will come from your house to the shed, what wiring and panel will be installed, and what circuits and loads are planned.
Step 2: The Rough-In Inspection
Before any wiring is covered by drywall, sheathing, or finished surfaces, a rough-in inspection is required. The inspector verifies that wiring routes, conduit, junction boxes, and panel installation meet the NEC as locally amended. The inspector must sign off before work is covered.
Step 3: Final Inspection and Energizing
After all electrical work is complete, a final inspection is scheduled. The inspector verifies outlets, switches, panel labeling, GFCI protection (required in wet locations like sheds), and grounding. After the final is approved, the circuit can be energized.
Running Power to a Shed: Your Main Options
Option A: Underground Direct-Burial Cable (Most Common)
The most common method is running underground cable from your home's main electrical panel (or a sub-panel) through a trench to the shed. Key specifications:
- Cable type: USE-2 or UF-B (Underground Feeder) cable is rated for direct burial. THWN/THHN conductors in conduit also work.
- Burial depth: NEC requires at least 24 inches deep for direct-burial cable without conduit, 6 inches if in rigid metal conduit, 12 inches if in PVC conduit. Local amendments may require more.
- Conduit at entry/exit points: Where the cable enters the ground at the house and exits at the shed, it must be protected in conduit from the point of entry to at least 18 inches below grade.
- Circuit sizing: Size the feeder wire for the anticipated load — a general-use workshop shed typically needs at least a 60-amp sub-panel; a simple outlet for lights and a phone charger might only need a 20-amp circuit.
Option B: Overhead Service Drop (Less Common for Sheds)
Running overhead wiring from the house to the shed is less common for residential sheds but is permitted in some jurisdictions. Minimum height clearances (typically 10–12 feet over driveways, more over roadways) and proper weatherhead installation at the shed are required. Many inspectors prefer underground for shed connections as it's cleaner and less prone to damage.
Option C: Sub-Panel in the Shed
For any shed with multiple circuits — a workshop with power tools, a studio with lighting and outlets, a she-shed with a mini-split — a sub-panel in the shed is the cleanest approach. A single feeder cable from the house feeds the sub-panel, and individual breakers in the sub-panel feed each circuit in the shed. Sub-panels require a 4-wire feeder (two hots, a neutral, and a separate ground) per modern NEC requirements.
DIY vs. Licensed Electrician: Who Can Pull the Permit?
This is the most frequently misunderstood aspect of electrical permits. The answer varies by state:
| State Policy | States / Examples |
|---|---|
| Homeowner can pull permit and do own electrical work on their primary residence | Most U.S. states — including Texas, Florida (with some conditions), Colorado, Washington, Oregon, most Midwest states |
| Licensed electrician required for all permitted electrical work, even for homeowners | Some strict states and cities — including Massachusetts, Illinois, certain California jurisdictions, and NYC metro area |
| Homeowner can do the work but a licensed electrician must pull the permit | Rare — some jurisdictions require the permit be under a contractor's license even for homeowner work |
Even in states where homeowner-pulled permits are allowed, the work is still inspected and must meet code. DIY electrical work that fails inspection must be corrected before it can be approved. If you're not confident in your electrical knowledge, hire a licensed electrician — the safety risk of improper wiring is real.
How Does Electrical Work Affect the Building Permit?
If your shed was originally small enough to be permit-exempt (e.g., under 200 sq ft in most states), adding electrical service typically triggers a building permit for the shed itself — not just an electrical permit. Here's why:
- The building inspector needs to verify that the shed structure is sound before the electrical inspector approves the final electrical work
- The building permit process includes a zoning review, confirming setbacks and placement are compliant
- Most jurisdictions link building and electrical permits: the building permit can't be finally closed until the electrical permit is closed, and vice versa
In practice, if you want to add power to a small existing shed that was never permitted, you may need to retroactively permit the shed structure itself as part of the electrical permit process. Contact your building department to understand the process before starting work.
Estimated Costs
| Item | Typical Cost Range |
|---|---|
| Electrical permit fee | $75–$200 |
| Licensed electrician (full shed wiring + sub-panel) | $800–$2,500+ |
| Materials (DIY): 60-amp feeder, conduit, sub-panel, wiring | $300–$800 |
| Trenching (if hiring out) | $200–$500 depending on distance |