Shed Electrical Hookup

A shed electrical hookup is the permanent power line that runs from your house panel to an outbuilding, and it is the difference between a backyard storage box and a real man cave. The job breaks into three parts: a feeder cable buried between the buildings, a small panel at the shed end, and the branch circuits inside that feed lights, receptacles, and the occasional appliance. In most homes that means a 10 or 12 AWG underground feeder (UF) cable run from the main panel, a trench dug across the yard, and a small panel mounted on the shed wall. For a typical man cave conversion, a single 20-amp circuit handles LED lighting and a wall of outlets, while a bigger build with a kegerator, heat, and a sound system starts to want a 60-amp subpanel and dedicated circuits.

Getting the hookup right matters because electricity in an outbuilding is where code rules bite hardest, and the failure modes are invisible until they are dangerous. The National Electrical Code is the floor, and local jurisdictions routinely amend it, which is why every figure in this entry is a starting point rather than the last word. The rough budget is the encouraging part: running power 50 to 150 feet typically lands between $500 and $3,800 including materials, or about $10 to $25 per linear foot, with a licensed electrician charging $90 to $150 an hour on top. The permit and inspection are part of that process, not optional extras.

A shed hookup is not the same thing as running an extension cord out the back door. A cord is temporary by design, undersized for a load that runs for hours, and a permanent build that leans on one is both a code violation and a fire hazard. The line between them is drawn by the same documents that govern kitchen wiring: the branch-circuit, grounding, and GFCI rules in the code, all enforced by the local building department.

Sizing the feeder and digging the trench

The numbers start with the load. Add up the lighting, receptacles, and appliances you plan to run; for a cave with a mini fridge, a TV, and a few outlets, a 120-volt 20-amp circuit is usually enough, and it is what most electricians run for a basic shed. Add a kegerator, a heater, or power tools and you move to a 240-volt feeder with a subpanel, where the neutral and grounding conductors stay separate and a ground rod at the shed ties the outbuilding to earth.

Burial depth comes straight from Table 300.5 of the code. A UF cable feeding a 120-volt 20-amp circuit needs 24 inches of cover in most soil, but when that circuit is GFCI-protected the required cover drops to 12 inches. Rigid or PVC conduit protects the cable and lets you run it shallower, and any run that passes under a driveway, parking area, or other vehicle path goes to 24 inches no matter the wiring method. Call 811 at least two working days before you dig so utility lines get marked; that call is free, and the damage it prevents is not.

Every receptacle in the shed needs GFCI protection. Under the code, all 125-volt, 15- and 20-amp receptacles installed in outbuildings must be GFCI-protected, which means either GFCI breakers in the shed panel or GFCI receptacles at each location. The shed also needs a disconnect within sight of the building so someone can kill power without walking back to the house, and that disconnect is usually the main breaker in the shed subpanel. All of this follows the electrical infrastructure pattern the rest of the house obeys, just run to a second building.

One branch circuit or a subpanel?

A single 20-amp branch circuit is the cheapest legitimate hookup, and it covers a surprising amount of man cave. Lights, a few outlet runs, a TV, and a bar fridge fit easily; the limit is roughly 1,920 watts of continuous draw (20 amps times 120 volts at 80 percent), and the moment you plan a second refrigerator or a heater you are over it. A subpanel, fed by a 60-amp 240-volt feeder, is the upgrade path, and it is the right call when the shed is a real cave rather than a storage corner.

The engineering difference shows up in the grounding. On a single branch circuit, the equipment ground comes back to the main panel. A subpanel in a detached building needs its own grounding electrode, typically one or two ground rods at least 6 feet apart driven to at least 8 feet, and the neutral bus must float separately from the grounding bus. Get that wrong and the shed becomes a shock hazard and a failed inspection in one move. That separation is code, and it is exactly the kind of detail a homeowner install misses. Compare this with the dedicated circuit discipline used for heavy loads, and you have the full picture.

Where the requirements come from

The rules are set by the National Electrical Code, published as NFPA 70 and updated on a three-year cycle, with the 2020 and 2023 editions widely adopted by states on their own schedules. The sections that govern a shed hookup are 210 (branch circuits and GFCI), 225 (feeders to outbuildings, which includes the disconnect requirement), 230 (services), and 300 with Table 300.5 (wiring methods and burial depths). GFCI protection itself is recent in code terms: the requirement arrived in the 1970s for outdoor receptacles and has expanded in every cycle since, which is why older homes and unupdated sheds have none.

None of this binds you until your local jurisdiction says it does. The code your inspector enforces is the version your state or municipality adopted, and local amendments routinely change burial depths and even whether a detached shed under 200 square feet needs an electrical permit at all. The practical move is to call the building department before you dig and get the exact table, the edition, and the permit fee in writing.

Common mistakes that cost you twice

The first is burying the cable too shallow, which is an instant inspection failure and a future shovel injury. Check the adopted Table 300.5 for your soil and wiring method, and when in doubt add six inches.

The second is skipping the GFCI because it is just a shed. The requirement is not negotiable for receptacles in outbuildings, and it is cheap insurance in a damp building where tools and extension cords meet concrete floors. Use GFCI breakers or receptacles, not hope.

The third is undersizing the feeder to save $50 on wire. A 15-amp run that later feeds a heater or a second fridge trips constantly, and the fix means digging the trench again. Write the load list before you buy wire, add a future appliance, and size up one conductor if you are on the fence. Hiring an electrician for the trench-to-panel work is worth the hourly rate; the rework costs more than the labor.