Setting up an outdoor workspace, hobby area, or storage shed is a great idea—until you realise you need power. Since sheds aren’t usually connected to your home’s mains electricity, you’ll need to install a dedicated circuit extending from your house.
While the job isn’t overly complicated, safety is crucial when dealing with electrics. If you’re unsure, hiring a qualified electrician is the safest way to ensure proper installation.
In this guide, we’ll cover everything you need to know about wiring to a shed and how to do it safely.
What Will You Be Powering in the Shed?
The amount of power your shed requires depends on how you plan to use it. If you only need a single light, the setup will be much simpler than if you need multiple sockets for tools, heating, or office equipment.
Some people also require exterior sockets on the shed to power garden tools like lawnmowers, pond pumps, or outdoor lighting.
Thinking ahead about your power needs ensures you install enough sockets and the right type of lighting. It’s often a good idea to install extra sockets—you never know when you might need them.
Choosing the Right Lighting
Most sheds use tube lighting, with the two main options being LED or fluorescent.
- LED lighting is the modern choice, offering better energy efficiency, longer lifespan, and brighter illumination. LED tubes can be wired directly into the mains without needing a ballast.
- Fluorescent lighting is the older option and requires a ballast to function. If you install fluorescent tubes, you won’t be able to easily swap them for LEDs later.
For long-term savings and efficiency, LED lighting is the better choice, especially if you’ll be spending long periods in the shed.
What Do You Need for Wiring to a Shed?
Before starting the job, you’ll need the right materials. If you’re hiring an electrician, they’ll likely supply everything, but it’s still good to understand what’s involved.
The essential components include:
- Steel Wire Armoured (SWA) cable or liquid-tight conduit – This runs underground from your home’s fuse box to the shed.
- Consumer unit (fuse box) – Installed in the shed to protect circuits.
- Light fittings, switches, and sockets – Chosen based on your needs.
- Electrical wiring – Used for internal connections.
- Residual Current Device (RCD) – Provides protection against electrical faults.
Key Considerations for Wiring a Shed
Before installation, there are a few things to plan for:
1. How Will You Run the Cable?
The safest way to get power to your shed is by running an SWA cable underground. This cable is designed to withstand moisture and environmental damage.
Depending on your property, the cable may need to follow different routes. It usually runs directly from your fuse box, but if there aren’t enough available circuits, a new consumer unit may be required. This is something a qualified electrician can assess.
2. Choosing the Right Cable Size
The size of the SWA cable depends on your power requirements. An electrician can help determine the best option, but in most cases, a 16mm to 25mm cable will be sufficient. The circuit should generally be connected to an RCD rated at 20 amps to handle standard shed power needs.
3. Planning the Installation
Marking out the route of the underground cable before installation can help avoid complications later. If you’re hiring an electrician, this can speed up the process and ensure everything is done efficiently.
Hiring a Qualified Electrician
Unless you have professional electrical knowledge, attempting to wire a shed yourself can be risky. Poorly installed electrics can lead to:
- Overloaded sockets, which could overheat and cause fires.
- Power surges that damage tools and appliances.
- Frayed or faulty wiring, increasing the risk of electrical shock.
A quick online search will bring up countless electricians, but how do you know which one to trust?
What to Look for in an Electrician
- Qualifications & Insurance – Ensure they are fully certified and have up-to-date insurance.
- Customer Reviews – Look for positive feedback from previous clients.
- Experience – Ask if they have experience wiring sheds and outbuildings.
- Willingness to Answer Questions – A good electrician will happily explain the process and reassure you.
Safety Considerations
Wiring to a shed is straightforward for a trained electrician, but safety should always be a priority.
- Always use an RCD – This cuts power instantly if a fault is detected, reducing the risk of electric shocks.
- Ensure cables are properly buried – SWA cables can safely be installed underground, preventing trip hazards and damage.
If you’re unsure about any aspect of the installation, consult a professional—electricity is not something to take risks with.
Conclusion
Adding power to your shed can make it far more useful, whether for work, hobbies, or storage. However, it’s important to plan the installation properly and ensure all wiring is done safely.
If you’re not a qualified electrician, hiring a professional is the best way to guarantee a safe and long-lasting installation. Proper planning, quality materials, and expert installation will ensure your shed has the reliable power supply it needs.
