Running power to a shed is one of the more common jobs we’re asked about. It’s not the most complex electrical project, but there are a few things worth understanding before you start — particularly around what the work involves and why it needs to be done properly.
Start with what you want to power
Before anything else, think about what you’re actually going to use the shed for. A basic setup with a couple of sockets and a light is straightforward. A proper workshop with power tools, a heater, and strong lighting is a bigger job. Being clear about this upfront means the electrician can size the circuit correctly and make sure you’re not constantly tripping the supply.
How the power gets there
The standard approach is to run Steel Wire Armoured (SWA) cable underground from your house to the shed. SWA is tough, moisture-resistant, and designed for direct burial — it’s the right cable for the job. The route needs to be planned carefully (avoiding garden beds, paths, and anything that might be dug up later) and the cable needs to be deep enough to be protected.
Inside the shed, you’ll need a small consumer unit to control the supply, along with an RCD for protection against electric shock. The sockets, switches, and lights are then wired from that.
A few things to consider
If your consumer unit in the house doesn’t have a spare way, you’ll need to add one before the shed circuit can be connected. This sometimes catches people off guard on cost. For most sheds a 16mm to 25mm SWA cable on a 20-amp RCD-protected circuit is adequate — but the right size depends on the load you’re planning.
For lighting, LED is the sensible choice. It’s more efficient, the fittings last longer, and the light quality is better. Fluorescent fittings are older technology at this point and not worth specifying for a new installation.
Do you need an electrician?
Running a new circuit from your consumer unit falls under Part P of the Building Regulations, which means it needs to be carried out by a registered electrician who can certify the work. It’s not a DIY job unless you’re already qualified. Getting it done properly also means you’ll have documentation to show if you ever sell the property or need to make an insurance claim.
If you’re based in Bristol or South Gloucestershire and want to get your shed wired up, get in touch and we’ll give you a quote.
