USB sockets: are they worth fitting?
By Azzeddine Kebbi, NAPIT-registered electrician and director of Kebbi Electrical Services · Updated 10 November 2026
A USB socket is a normal 13 A double socket with USB charging ports built in. It replaces an existing socket, so you can charge phones and tablets without a plug-in adaptor. They are worth fitting where you charge every day, such as bedsides, kitchens and desks.
What to check before you buy
USB-C or USB-A
USB-C is the current standard for phones, tablets and many laptops. Many sockets have one of each.
Charging power
Output is given in watts. Higher wattage charges faster, and USB-C Power Delivery sockets charge fastest.
Back box depth
USB sockets are deeper than standard ones. Many need a 35 mm back box, so check what is in the wall.
Quality
Choose a known brand made to BS 1363. Very cheap unbranded sockets are a common cause of faults.
Are USB sockets safe?
Yes, when they are a good-quality product fitted correctly. The USB part is a small built-in charger, so it uses a little power even when nothing is plugged in, and like any charger it can fail with age. If a USB socket gets hot, buzzes or smells, stop using it and have it replaced.
Fitting one
- Swapping a socket like for like is not notifiable work, but it is mains wiring and the circuit should be tested afterwards.
- If the back box is too shallow, it needs replacing, which means cutting into the wall.
- Standard socket outlets are not allowed in bathrooms.
Common questions
Are USB sockets worth it?
They are worth it in places where you charge devices every day. They free up the plug sockets and do away with adaptors.
Do USB sockets use electricity when nothing is plugged in?
Yes, a very small amount, because the built-in charger is always powered. Some models have a switch for the USB ports.
Can I replace a normal socket with a USB socket?
Usually yes, if the back box is deep enough. It involves mains wiring, so use a registered electrician if you are not competent to do it safely.
Do USB sockets charge as fast as a plug-in charger?
It depends on the wattage. A high-power USB-C socket can match a good plug-in charger. Basic USB-A sockets charge more slowly.
Want USB sockets fitted?
We replace and add sockets and test the circuit afterwards. See our electrical installations and repairs.