Outdoor Socket Installation Scope of Works Survey & test existing circuit, identify suitable feed or spur. Supply weather‑proof IP66 socket (single or doubl...
Adding an outdoor socket in a UK home is a notifiable Part P electrical job, typically costing £140–£320 for a single weatherproof socket on the back wall, run from an existing internal circuit. More involved installations (long cable runs, separate consumer unit feed, or multi-socket pillars) range from £300–£700.
Outdoor sockets need to be IP-rated, RCD-protected, and properly certified — Part P notification is essential because outdoor electrical work is in a "special location" under the Wiring Regs.
Typical UK costs
| Job | Typical price |
|---|---|
| Single IP55 socket on back wall (cable from inside) | £140–£280 |
| Twin IP55 socket | £170–£330 |
| Outdoor socket on detached pillar (in garden) | £250–£500 |
| Dedicated outdoor circuit + consumer unit work | £350–£700 |
| Garden building feed (armoured cable + sub-board) | £500–£1,500 |
| EV charger install (separate spec) | £800–£1,400 |
What's involved
- Cable from internal circuit — the easiest case. Tap off an existing socket on an internal wall, run cable through the wall to the back, and fit an IP55 outdoor socket. 2–3 hour job.
- Long cable run to garden / outbuilding — typically uses SWA (steel-wired armoured) cable buried at minimum 450 mm depth in a duct, with marker tape above. More involved; allow half a day to a full day.
- Dedicated circuit — a new MCB / RCBO at the consumer unit, dedicated cable run to the outdoor area. Required for high-current uses (EV charger, garden building).
Choosing the right outdoor socket
- IP rating — IP55 minimum (dust and water-jet resistant). IP66 better for fully exposed positions.
- Mounting — surface-mount (easier on existing brickwork) or flush-mount (tidier, requires chasing).
- Hinged cover — must close fully when a plug is in use, and provide a weatherproof seal around the cable when closed on a plug.
- RCD protection — mandatory; either via the circuit's RCD at the consumer unit, or an RCD spur at the socket.
Things people often miss
- Cable depth and route — outdoor cables under 450 mm need protection (concrete cover slab, conduit, or warning tape). Domestic gardeners regularly cut shallow cables; the regs are there for a reason.
- Dedicated circuits for EV chargers — don't try to spur an EV charger from a regular outdoor socket. EV chargers need 32A on a dedicated circuit with type-A or type-B RCD protection per BS 7671.
- Cable de-rating in conduit — running cable in conduit reduces its current rating; the electrician will size up the conductor for buried runs.
- Height from ground — outdoor sockets should be 150 mm+ above finished ground level to avoid splashing and standing water.
- Future-proof for the garden — if you might want a garden building, water feature, or hot tub later, run a larger cable now. Adding a second cable later is much more expensive.
Frequently asked questions
Can I install an outdoor socket myself?
Outdoor electrical work is in a "special location" under Part P; new circuits must be notified, certificated, and tested by a competent person. Most insurance and conveyancing solicitors will flag uncertified outdoor electrical work on sale. Use a Part P registered electrician.
How long does an outdoor socket installation take?
Single back-wall socket: 2–4 hours. Multi-socket runs or buried garden cabling: half a day to a full day. Includes notification paperwork.
Do I need RCD protection for an outdoor socket?
Yes — mandatory under BS 7671. Either via the circuit RCD at the consumer unit, or an inline RCD spur at the socket. Without RCD, the install fails certification.
What about powering a garden office?
A separate, dedicated armoured-cable feed from the consumer unit is the right approach — typically 6–10 mm² SWA buried at 450 mm depth, terminating in a small sub-board in the office. Allow £500–£1,500 depending on distance and how many circuits are needed in the building.
Can I run an extension lead to the garden instead?
Short-term, occasional use — yes, but only with an outdoor-rated extension lead and only when monitored. Permanent extension-lead use through windows is a fire and trip hazard, not weather-protected, and usually breaches insurance.
Will an outdoor socket affect my house insurance?
Properly installed and certified — no, it actually adds value. Uncertified DIY installs are flagged by EICRs and home buyer surveys, and may invalidate parts of your insurance. Always get the Part P certificate.
Want a local pro to handle this? A Part P registered electrician will install, certify, and notify outdoor work properly. Cheap unregistered installs cost more in the long run when the certificate is missing at sale.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
