What Counts as Outdoor Electrics?
Outdoor electrical work covers a wide range of jobs – from a single weatherproof socket on an external wall to a full sub-distribution board in a garden office. Common jobs we carry out across Mid Somerset and surrounding areas include:
- Outdoor socket outlets – for garden tools, BBQs, festoon lighting, and outdoor appliances
- Garden lighting circuits – path lights, uplighting, security floodlights (see security lights and outdoor switching)
- Shed and outbuilding power – separate circuit with its own RCD and consumer unit in larger outbuildings
- Garden office electrics – full power and lighting installation with separate sub-board
- Hot tub circuits – dedicated supply sized to the spa's load (see our hot tub electrics guide)
- EV charger groundwork – SWA cable runs from the house to a driveway charger location
All Outdoor Work is Notifiable Under Part P
Installing any new circuit, including one for outdoor sockets, is notifiable work under Part P of the Building Regulations. It cannot legally be done by a homeowner or unregistered tradesperson without involving Building Control directly. As NAPIT registered contractors, we self-certify and notify on your behalf – you receive a signed EIC and the work is registered.
Outdoor Sockets and Festive Lighting: What to Check
From November the extension leads come out of the shed and the lights go up along the gutter. A few basics keep it safe:
- Outdoor lights only outside – check the packaging says the lights and any lead are suitable for outdoor use, and follow the manufacturer's instructions
- Keep plugs and connections out of the wet – plugs, adaptors and transformers belong indoors or inside a weatherproof outdoor socket, not lying on the lawn
- RCD protection – plug into a socket protected by a 30mA RCD (see below). If your home has no RCD protection at all, that is worth fixing at the consumer unit
- No daisy-chaining – avoid overloading sockets and extension leads, and don't plug one extension lead into another
- Switch off – unplug the lights overnight and when you are out
If you are feeding a lead through a door or window every winter, a fixed outdoor socket is the permanent answer. We fit weatherproof outdoor sockets and new outdoor circuits, tested and certified; we don't supply or put up festive lighting. Tips on unplugging and overloading follow Electrical Safety First's Christmas safety advice.
IP Ratings for Outdoor Electrics
The IP (Ingress Protection) rating tells you how well an electrical fitting is protected against solids and water. For outdoor use in the UK, the ratings you need depend on the location:
| Location | Minimum IP Rating | Example |
|---|---|---|
| Under eaves, sheltered wall | IP44 | Standard weatherproof socket with flap cover |
| Exposed wall, direct rain | IP55 | Sealed outlet with gasket lid |
| Ground level, garden or patio | IP65 | In-ground or surface-mount ground sockets |
| Near water features / pools | IP67+ | Zone 1/2 fittings near ponds or tubs |
We only fit appropriately rated accessories for the location. A budget IP20 socket on an exterior wall is not compliant and will fail in British weather within a season.
RCD Protection: The Non-Negotiable Rule
Every outdoor socket outlet in the UK must be protected by a 30mA Residual Current Device (RCD). This is a hard requirement under BS 7671:2018 Regulation 411.3.3. In practice, this means either:
- An RCBO protecting the outdoor circuit at the consumer unit, or
- An RCD upstream in the consumer unit covering the circuit, or
- An RCD socket outlet (where the RCD is built into the socket itself)
We always install RCBO protection at the consumer unit for new outdoor circuits – it gives individual fault protection without tripping other circuits.
Cable Burial Depths and Types
Cables buried in the ground must comply with the minimum depths specified in BS 7671 and IET Guidance Note 1:
| Location | Minimum Depth | Notes |
|---|---|---|
| Open ground (lawns, borders) | 600mm | Warning tape installed 150mm above cable |
| Under paths and driveways | 500mm | Mechanical protection required |
| Under roads | 600mm+ | Always in duct for future access |
For buried runs, we use Steel Wire Armoured (SWA) cable. The steel armouring protects against garden tools, ground movement, and rodents. We record the cable route on the EIC so it can be located in future. For surface runs along walls and fencing, we use UV-stable conduit or trunking with appropriate IP-rated junction boxes.
Do Not Use Standard Twin & Earth for Buried Runs
Grey 2.5mm² twin and earth cable is not rated for direct burial. It has no mechanical protection and will degrade rapidly in soil. We regularly uncover DIY outdoor installations where standard cable has been buried – sometimes just a few inches down – creating a serious shock and fire risk. SWA is the correct cable.
What Drives the Price of Outdoor Electrics
| Job | What's Included |
|---|---|
| Single outdoor socket (surface run) | IP-rated socket, RCBO, EIC, Part P notification |
| Twin outdoor socket | IP-rated twin outlet, RCBO, EIC |
| Buried cable run | SWA cable, trenching, reinstatement, warning tape |
| Shed power (basic) | Dedicated circuit, RCBO, shed CU, sockets & lighting |
| Garden office electrics | Sub-board, multiple circuits, RCD, EIC |
| Garden lighting circuit | Switched circuit, IP65 fittings, RCBO, EIC |
No two gardens are the same, so we don't publish a price list. The price depends on the length of the cable run, whether cable needs burying, and site conditions. Every quote covers labour, materials, testing, certification and Part P notification. We provide a fixed written quote before any work starts.
Shed and Outbuilding Power
A garden shed or outbuilding with its own electrical supply needs more than just a socket wired back to the house. The correct approach is a separate sub-circuit with its own consumer unit in the outbuilding, fed from a dedicated circuit at the house consumer unit. This gives you:
- Independent fault protection – a problem in the shed does not affect the house
- A proper earth arrangement for the outbuilding
- The ability to isolate the outbuilding independently
- Separate circuits for lighting and power within the building
For larger garden offices and workshops, we specify the load requirements (lighting, computers, power tools, heating) and design the sub-board accordingly. These installations are notifiable under Part P regardless of the outbuilding's size.
Frequently Asked Questions
Can I install an outdoor socket myself?
We do not recommend it. A new outdoor socket on its own new circuit is notifiable work under Part P of the Building Regulations; outdoors is not a special location, so a socket added to an existing circuit is not notifiable, but it must still meet BS 7671. For notifiable work, it must either be done by an installer registered with a competent person scheme (who self-certifies), checked by a registered third-party certifier, or notified to building control before work starts. An unregistered installation cannot be self-certified; check your insurance policy for any conditions on electrical work.
What IP rating do outdoor sockets need?
At minimum, IP44 for a sheltered location under eaves. For exposed walls or anywhere likely to catch direct rain, IP55 or higher. For ground-level installations, IP65. All outdoor socket outlets must be RCD-protected at 30mA.
How deep should outdoor cables be buried?
600mm in open ground and 500mm under paths and driveways, using SWA (Steel Wire Armoured) cable with warning tape installed above the run. We document the route on the Electrical Installation Certificate.
Does outdoor socket installation need Building Control notification?
Yes. As NAPIT registered contractors, we self-certify and notify Building Control on your behalf. You receive a full Electrical Installation Certificate as proof of compliance – important for insurance and when you sell your property.
Why Choose DS Electrical Installations (SW) Ltd?
- NAPIT Approved – all work self-certified and notified to Building Control on your behalf
- Outdoor electrical work – SWA cable runs, buried circuits, IP-rated accessories throughout
- City & Guilds 18th Edition qualified
- Fixed prices – written quote before work starts, no day-rate surprises
- Local – Wells, Shepton Mallet, Bath, Frome, Glastonbury and surrounding villages
Common questions
What IP rating do outdoor sockets need?
Outdoor sockets in the UK must be rated at least IP44 (protected against solid objects over 1mm and water splashing from any direction). For exposed locations – under eaves, on garden walls, or anywhere likely to catch rain directly – IP55 or IP66 is recommended. All outdoor socket outlets must also be RCD-protected at 30mA.
How deep should outdoor cables be buried?
BS 7671 and IET Guidance Note 1 require buried cables to be at least 500mm deep under paths and driveways, and 600mm in open ground. Cables must be run in SWA (Steel Wire Armoured) or enclosed in conduit rated for buried use. Warning tape is installed above the cable and the route is documented on the Electrical Installation Certificate.
Does outdoor socket installation need Building Control notification?
Yes, if it needs a new circuit: any new circuit is notifiable under Part P of the Building Regulations. Outdoors is not a special location, so a socket added to an existing circuit is not notifiable. As NAPIT registered contractors, DS Electrical Installations (SW) Ltd self-certifies and notifies Building Control on your behalf, issuing a full Electrical Installation Certificate (EIC).
Can I leave festive lights outside all winter?
Only if they are made for permanent outdoor use and plugged into a weatherproof, RCD-protected outdoor socket. Most seasonal lights are designed to go up and come down, so check the manufacturer's instructions, and unplug them overnight and when you are out.
Do I need an RCD for outdoor lights?
Yes. Every outdoor socket outlet must be protected by a 30mA RCD. If your home has no RCD protection, the proper fix is RCD protection at the consumer unit, which we can fit.
How many outdoor sockets do I need?
It depends what you want to power. A common setup is a socket at the front for festive or porch lighting and one at the back for garden tools, a BBQ or garden lighting. We suggest positions when we look at the job.
