HOW-TO GUIDES
How to wire a plug socket safely: Step-by-step guide
Updated 07/26
What's legally allowed as DIY electrical work
How to wire a replacement socket safely
How to spur a new socket from an existing one
How to wire a double or 3-gang socket
Why wiring a socket from a light switch isn't straightforward
How much it costs to add a socket
Plug sockets are one of those things you can never have enough of. Which is why learning how to wire a plug socket is such a handy skill.
But when you're dealing with electricity, safety matters.
Read on to learn the key steps for wiring a plug socket safely. But first, let's cover the legal regulations you need to know about.
Important legalities: What you can (and can't) do
Under Part P of the Building Regulations, certain electrical work must be carried out (or signed off) by a competent, registered person.
However, that doesn't rule out all electrical DIY jobs.
Non-notifiable work (which you can do yourself, checking with your local authority if you're ever unsure) includes:
Work outside 'special locations' like bathrooms and areas near water (think living rooms, bedrooms, porches, hallways, gardens, loft spaces and dining rooms)
Like-for-like replacement of an existing socket or fitting
Replacing damaged cable
Adding sockets and a single fused spur to an existing circuit
Installing entirely new circuits, or anything in a bathroom or similarly regulated space, should be left to a registered electrician.
You must check with the building control dept of your local authority prior to any works being carried out. Regulations are regularly changed and updated.
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Don't ever underestimate the importance of electrical safety in the home. As a homeowner, you have a legal duty of care to anyone who visits your home. You can be held liable if someone is hurt by faulty electrical work you've carried out.
Safety first: Before you touch any wiring
All electrical work should comply with the 18th Edition IEE Wiring Regulations. This means before starting, you'll need to:
Switch off the electricity at the mains/fuse box
Isolate the specific circuit by removing its fuse or switching off and locking the breaker
Leave a note or tape over the circuit switch so no one turns it back on
Confirm the circuit is dead using a socket tester or voltage tester
Test your voltage tester on a socket you know is live before you turn the power off, just to confirm the tester itself is working properly.
Tools and materials
Making sure you're prepared and have the right tools is essential when working with electrics. Here's the kit you'll need:
Screwdrivers
Socket tester / voltage tester
2.5mm two-core-and-earth cable
Wire strippers and side cutters (scissors or standard piliers will damage the wiring)
Rubber grommets
Green/yellow sleeving
Starting to think this is a bigger job than you thought? If in any doubt, you're best off leaving it to a professional.
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Still thinking of tackling it yourself? If you're confident working safely with electrics and have the right tools, read on for our step-by-step guides to replacing or wiring a plug socket.
How to replace an existing socket
Got the necessary tools and materials to hand, and read up on the safety warnings above? Then you are ready to learn how to wire a plug socket.
To do so, follow the below steps:
Switch off the electricity at the mains/fuse box
Isolate the specific circuit by removing its fuse or switching off and locking the breaker
Leave a note or tape over the circuit switch so no one turns it back on
Confirm the circuit is dead using a socket tester or voltage tester
Note the UK wiring colours: brown (live, marked L), blue (neutral, marked N), and green/yellow (earth, marked E or three vertical lines). Older wiring may use red for live and black for neutral instead
Unscrew and gently pull away the old faceplate to reveal the wiring
Take a photo of the existing connections before disconnecting anything
Loosen the terminal screws and free the wires, setting the old socket aside
Trim any frayed wire back with side cutters, leaving around 5mm of clean wire exposed, and sleeve any bare earth wire in green/yellow
Check the terminal layout on the new socket carefully, since it may differ from the old one.
Connect wiring. Remember: brown to L, blue to N, and green/yellow to E, making sure no bare wire is visible once tightened
Refit the faceplate carefully, without trapping any wires, and screw it back in place
Replace the fuse, restore power, and test with a socket tester
But remember, only replace a socket yourself if you're confident working safely with electrics. Always isolate the power and verify the circuit is dead before starting.
If you're unsure, hire a qualified electrician by searching your postcode below.
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How to wire a socket from another socket
You can wire a new socket from an existing one. This is commonly known as a spur.
However, there are strict UK Wiring Regulations to know about depending on the type of circuit you use.
If you're adding an unfused spur to a ring circuit (common in the UK), you are only allowed to add one spur from an existing socket. So first, check that the socket you're planning to spur from is suitable before you begin.
The following instructions will teach you how to wire a socket from another socket in 7 clear steps:
Switch off the electricity at the mains/fuse box
Isolate the specific circuit by removing its fuse or switching off and locking the breaker
Leave a note or tape over the circuit switch so no one turns it back on
Confirm the circuit is dead using a socket tester or voltage tester
Install the new socket and run 2.5mm two-core-and-earth cable back to the existing socket
At the new socket, feed the cable through a rubber grommet and connect the cores to the faceplate terminals, sleeving the earth core
Repeat the connection process at the existing socket you're spurring from.
For metal faceplates, run a short earth link between the faceplate and the mounting box
Refit both faceplates, restore power, and test
All that said, spurring sockets can be a confusing and complex job and mistakes can lead to overloading, which is dangerous.
If in any doubt, hiring a local electrician will mean the job is done safely and efficiently.
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How to wire a double or 3-gang socket
Converting a single socket to a double, or fitting a 3-gang socket, follows a similar process as above with a few extra checks:
Switch off the electricity at the mains/fuse box
Isolate the specific circuit by removing its fuse or switching off and locking the breaker
Leave a note or tape over the circuit switch so no one turns it back on
Confirm the circuit is dead using a socket tester or voltage tester
Unscrew the faceplate and disconnect the wires from the single socket's mounting box
Use a pipe and cable detector to check the wall behind the new box location for hidden pipes or cables before drilling
Drill, plug, and fix the new box in place
Feed the cable through the box, checking terminal positions on the new socket carefully - a 3-gang plate will have more terminals to keep track of, so work through them one at a time
Connect wiring. Remember: brown to L, blue to N, and sleeved green/yellow to E on each gang as required
Refit the faceplate and test with a socket tester
When to hire an electrician
Does the job involve a new circuit, a bathroom, or anything you're simply not confident isolating safely? It's worth hiring a professional rather than pushing on solo.
A good local electrician will:
Follow UK wiring regulations for safety and efficiency
Check whether your existing circuits have enough capacity
Explain if any additional wiring or upgrades are needed
How much does it cost for an electrician to wire a plug socket?
As a rough guide, the cost of installing a new plug socket is usually between £100–£200, including labour.
The final price will depend on the type of socket you choose, how accessible the location is, and whether additional wiring is needed.
Our adding a plug socket cost guide below has a detailed overview of the costs for a typical job with costs for single, double, USB and outdoor sockets.
New socket installation costs in the UK in 2026
This guide explains typical new socket installation costs in the UK, including electrician costs per socket, outdoor socket prices, USB socket upgrades and the factors that can affect your final quote.
Or try out our free interactive cost calculator below for an instant estimate based on the number and size of plug sockets you need fitting.
Job Estimate Calculator
If you decide to take on the job yourself, you'll still need to account for material costs, which can soon add up. Make sure to budget for electrical tools, twin & earth cable, socket faceplates and installation boxes.
Hiring an electrician: Checklist
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Request a quote, search in the Checkatrade app, or enter your postcode below to find qualified electricians near you.
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Before you start replacing a light fixture: Final checklist
Frequently asked questions
Lighting circuits and socket circuits are typically wired and fused very differently, with lighting circuits usually protected by a lower-rated fuse or breaker than sockets need. If you need power near a light fitting, this should be assessed and wired by a qualified electrician.
Knowing which colour wires go where in a UK plug socket can be confusing. Brown is live (L), blue is neutral (N), and green/yellow is earth (E). Older wiring may use red for live and black for neutral. If the earth wire is bare, it should be covered with green/yellow sleeving.
A like-for-like replacement of an existing socket, or adding a socket and single fused spur to an existing circuit, is generally 'non-notifiable work'. This means it can be a DIY job, if you've got the right tools and electrical safety knowledge. However, installing new circuits or anything in a bathroom must be done by a qualified electrician.
UK Wiring Regulations allow only one spur per existing socket.
Lighting and socket circuits are usually fused differently, and adding socket load to a lighting circuit risks overloading it, which is dangerous. Hire an electrician to assess and install this properly.
The principle of wiring a 3-gang plug socket is the same as a single or double socket - brown to L, blue to N, sleeved green/yellow to E. Just be aware there are more terminals to keep track of across each gang.
It's legal to carry out 'non-notifiable work' (i.e, doesn't need to be signed off), such as like-for-like replacements, provided you follow the Wiring Regulations and take proper safety precautions. Anything more involved should be carried out by a registered electrician.
The cost to install a new plug socket is around £150. This includes both the electrician's time plus materials such as cable, faceplates, and boxes. See our adding a plug socket cost guide for a full breakdown.
A socket tester or voltage tester confirms whether a socket is live. Always test your tester on a known-live socket first to make sure it's working correctly.
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