Why not just use extension leads?
Plugging extension leads into each other, or running high-power appliances like heaters from them, can overload them and cause overheating. Electrical Safety First has a guide to overloading sockets.
How extra sockets are added
- Extending an existing circuit: often possible for a socket or two, if the circuit and its protection are suitable.
- A new circuit: needed for a lot of extra load, such as a home office, workshop or kitchen. A new circuit is notifiable under Part P.
- Bathrooms and outdoors have extra rules, so get advice first.
An electrician will check the existing circuit, RCD protection and earthing before adding to it, and test it afterwards to BS 7671.
Safety first
Adding sockets means working on fixed wiring. If you're not trained and equipped to isolate and test safely, leave it to a registered electrician.
When to call an electrician
- You need more sockets in a room, a home office or a kitchen
- You'd like USB sockets or outdoor sockets
- Existing sockets are warm, loose or damaged
Sources and further reading
- Electrical Safety First – Overloading sockets
- GOV.UK – Approved Document P (electrical safety in dwellings)
- IET – BS 7671 Wiring Regulations
General guidance only, based on the sources above. Last reviewed October 2026. It isn't a substitute for an inspection by a qualified electrician.