Quick Answer
Adding an outdoor socket in the UK costs £150–£450 in 2026 depending on whether it is single or double and how far it is from the existing supply. The work is notifiable under Part P and must be carried out by a registered electrician.
An outdoor socket is one of the most practical electrical upgrades a homeowner can make — useful for garden tools, outdoor lighting, barbecue equipment, and keeping your extension lead out of sight. But because it involves a new circuit (or extension of an existing one) in a location exposed to the elements, it is not a job to cut corners on. This 2026 guide explains the planning, regulations, costs, and what to expect from the process.
In this guide
Planning and Part P Notification
Installing an outdoor socket is notifiable work under Part P of the Building Regulations. This means it must either be carried out by a registered electrician who can self-certify the work, or be notified to your local authority building control before work begins. In practice, virtually all homeowners use a registered electrician — the certification route through building control is slower and more expensive.
The reason outdoor electrical work is notifiable is straightforward: sockets and cables exposed to weather, soil, and mechanical damage present significantly higher risks than indoor wiring. An improperly installed outdoor socket is a serious electrocution and fire risk. For the full explanation of what Part P covers, read our guide to Part P electrical regulations.
Types of Outdoor Socket
Not all outdoor sockets are the same. The type you need depends on where it will be installed and what you will plug into it:
| Socket Type | IP Rating | Best For | Typical Cost Fitted |
|---|---|---|---|
| Single weatherproof socket (IP44) | IP44 (splash-proof) | Sheltered wall position, occasional use | £150–£280 |
| Double weatherproof socket (IP44) | IP44 | Two appliances, patio area | £200–£380 |
| Single socket (IP66) | IP66 (jet-proof) | Exposed positions, near water features | £180–£350 |
| RCD-protected outdoor socket | IP44+RCD | Any outdoor location — maximum safety | £200–£450 |
Regardless of the IP rating of the socket itself, the circuit supplying any outdoor socket must be protected by an RCD with a residual operating current not exceeding 30mA. This is a requirement under BS 7671 (the IET Wiring Regulations). If your existing consumer unit does not provide this protection, your electrician will need to add RCD protection or recommend a consumer unit upgrade — see our consumer unit replacement cost guide for more detail.
What the Installation Involves
The complexity of fitting an outdoor socket depends primarily on where the socket is going and how far it is from the consumer unit or an existing ring main. A typical installation follows these steps:
- Route assessment — The electrician plans how to get cable from the consumer unit (or existing circuit) to the outdoor location, avoiding obstacles and structural elements
- Cable installation — Armoured cable (SWA) or standard cable in conduit is used for outdoor runs; buried cable must be at the correct depth and appropriately protected
- RCD protection — Ensured at the board or via a fused connection unit with RCD at the point of supply
- Socket installation — Weatherproof backbox and socket fitted to the external wall
- Testing and certification — The circuit is tested against BS 7671, and a Part P certificate is issued
Why DIY Is Not the Answer Here
Unlike changing a light switch or replacing a socket like-for-like, installing an outdoor socket from scratch involves creating a new circuit (or extending one) in a location where faults can be fatal. Adding an outdoor socket is specifically notifiable work under Part P.
Beyond legality, poorly installed outdoor wiring is one of the most common causes of serious electrical accidents in UK gardens. Water ingress into unprotected joints, inadequate cable protection, and missing RCD protection are DIY mistakes that have killed people. Even if the socket appears to work, you will not have a certificate — which is a problem when you come to sell the house, and may invalidate your home insurance. For detailed guidance on what to look for in a qualified electrician, see our guide to finding a trustworthy electrician. And for what the process of checking their credentials involves, our piece on electrical certificates and selling your house explains why that paperwork matters long-term.
What Does an Outdoor Socket Cost in 2026?
The typical cost breakdown for a single outdoor socket in 2026:
| Scenario | Cost Range | Notes |
|---|---|---|
| Single socket, short cable run | £150–£280 | Simple route through cavity wall from ring main |
| Double socket, short cable run | £200–£380 | Slightly more for double socket unit |
| Single socket, long cable run (>10m) | £250–£450 | More cable, armoured SWA where buried |
| Socket plus dedicated circuit from board | £300–£600 | Separate circuit from consumer unit |
| Multiple outdoor sockets on one job | Discount applies | Combine with other electrical work to save |
Always get at least two quotes and make sure the price includes the Part P certificate. To understand the labour rates behind these numbers, our electrician cost per hour guide is useful context.
Frequently Asked Questions
Can I run an extension lead outside instead of having a socket fitted?+
You can use a weatherproof extension lead rated for outdoor use for temporary purposes, but a permanent extension lead running through a window or door gap is a fire hazard and a tripping risk. For regular outdoor use, a properly installed socket is the right solution.
Do I need planning permission for an outdoor socket?+
No — a standard outdoor socket does not require planning permission. It is covered by Building Regulations (Part P) rather than planning law. The only exception might be if your property is listed or in a conservation area, where even small external modifications may require consent.
Can an outdoor socket supply a garden office or summerhouse?+
Yes, but a cable supplying a separate structure like a shed, summerhouse, or garden office is a separate circuit and must be run correctly — typically in armoured SWA cable, properly buried, with its own RCD protection and earthing. This is more involved than a simple outdoor socket and should be quoted separately.
What IP rating do I need for my outdoor socket?+
IP44 (splash-proof) is the minimum for most sheltered outdoor positions — covered by a porch, under an overhang, or on a sheltered wall. For exposed positions or near water features, IP55 or IP66 is better. Your electrician will advise based on the specific location.
Will adding an outdoor socket affect my home insurance?+
Provided it is installed by a registered electrician with the correct Part P certificate, it will not negatively affect your insurance. In fact, unregistered work can invalidate your cover in the event of a related claim.
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