How to Rewire Your Garden Shed with Ease


Rewiring a garden shed can seem like a daunting task, but with the right preparation and materials, it can be done with ease. A properly wired shed allows you to run lighting, outlets, and even heating - making your shed fully functional for storage, workspace, or hobby area. I'll walk you through all the steps I took to successfully rewire my shed, so you can do the same!

Reasons to Rewire Your Shed

There are a few key reasons you may want to rewire your shed:

Planning the Rewire

Careful planning is crucial to a successful shed rewire. Here are the key steps I took:

Choose a Shed Rewiring Method

There are two main approaches:

I chose the subpanel method as trenching was not practical.

Create a Wiring Diagram

Map out your planned lighting, outlets, switches and any high power devices. This tells you how much power you need from the subpanel. Mark electrical box and conduit locations.

Obtain Required Permits

Check with your local building department on permit requirements for shed rewiring. Permits ensure proper inspections.

Choose a Shed Rewiring Subpanel Size

Size your subpanel to handle your planned electrical loads with room to spare for future expansion. I chose a 24 circuit, 100 amp subpanel.

Purchase Supplies

You'll need wiring, boxes, conduit, breakers, the subpanel, outlets, switches and lighting fixtures. Buy quality materials that meet electrical code.

Rewiring the Shed Step-by-Step

With planning done, I was ready to get to work. Here is the process I followed:

Turn Off Power

Shut off all power at your main panel before starting any electrical work. Verify it's off with a tester.

Remove Old Wiring

Take down the old wiring, outlets, switches and light fixtures. Removing old materials first reduces confusion.

Install New Electrical Boxes

Mount new plastic or metal boxes where you want switches, lights and outlets located. Follow box mounting guidelines.

Run Conduit between Boxes

Determine conduit routing between boxes. Cut and connect rigid metal or flexible PVC conduit.

Pull Wires through Conduit

Carefully pull the correct gauge THHN/THWN-2 wire through each conduit run for the circuits you need.

Connect Wires to Devices

Attach wires to outlets, switches and light fixtures according to wiring diagrams. Use wire nuts or crimp connectors.

Connect Subpanel

Mount the new subpanel according to code requirements. Feed the input circuit from your main panel into the subpanel.

Attach Grounds and Neutrals

Properly bond all ground wires, conduits and neutral wires together in the subpanel. This provides a safe path for stray current.

Connect Circuits to Breakers

Connect hot circuit wires to appropriate amperage breakers and label each circuit clearly at the subpanel.

Inspect and Test

Have an electrician inspect wiring and test all circuits. Make any necessary corrections before powering up.

Energize the Subpanel

With approval, turn the main breaker on at your house panel. Turn on each new shed circuit one at a time while checking for problems.

Helpful Rewiring Tips

Follow these tips for a smooth wiring project:


While rewiring a shed takes planning and care, it is very manageable as a DIY project. The result is a shed that is safer and provides the electrical functions you need. Just focus on doing thorough prep work, adhering to electrical codes, and having all wiring inspected. Be sure to turn the power off before starting! Follow the steps outlined above, take it slowly, and you can rewire your shed with ease.