Outdoor sockets: what you need to know
By Azzeddine Kebbi, NAPIT-registered electrician and director of Kebbi Electrical Services · Updated 10 November 2026
An outdoor socket must have 30 mA RCD protection and a weatherproof (IP-rated) enclosure. It is usually fed from an existing indoor circuit, or a new circuit if you need more power, for example for a hot tub or garden office.
What a safe outdoor socket needs
RCD protection
30 mA RCD protection is required for sockets used outdoors.
Weatherproof enclosure
A socket rated for outdoor use, with a lid that seals when nothing is plugged in.
Suitable cable
Cable that is protected from damage where it runs outside or underground.
Testing
The circuit is tested and certified when the work is done.
Is it notifiable?
Adding an outdoor socket to an existing circuit is usually not notifiable in England, so it gets a Minor Works Certificate. A new circuit, for example to a garden room, is notifiable and gets an Electrical Installation Certificate.
Things to decide
- Where you will use it: patio, garage wall, garden room or EV parking.
- Single or double socket, and whether you want a switched one.
- Whether you need a separate circuit for heavy loads such as hot tubs or heaters.
Common questions
Does an outdoor socket need an RCD?
Yes. Sockets that may be used to supply equipment outdoors need 30 mA RCD protection.
What IP rating does an outdoor socket need?
It must be suitable for outdoor use. Many outdoor sockets are IP66 rated. Your electrician will choose one to suit where it is fitted.
Can I use an extension lead outside instead?
For occasional use, an outdoor-rated lead with RCD protection can be used, but do not leave leads running out of windows or doors. A fixed outdoor socket is safer.
Can I charge my EV from an outdoor socket?
A standard outdoor socket is not a substitute for a dedicated charger. See EV charger installation rules.
Want an outdoor socket?
See our electrical installations and extension and outbuilding wiring.