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 Somerset include:
- Outdoor socket outlets -- for garden tools, BBQs, festoon lighting, and outdoor appliances
- Garden lighting circuits -- path lights, uplighting, security floodlights
- 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 or socket outlet in an outdoor location 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.
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.
Outdoor Socket Installation Cost
| Job | Typical Cost | What's Included |
|---|---|---|
| Single outdoor socket (surface run) | From £180 | IP-rated socket, RCBO, EIC, Part P notification |
| Twin outdoor socket | From £220 | IP-rated twin outlet, RCBO, EIC |
| Buried cable run (per 10m) | From £120 | SWA cable, trenching, reinstatement, warning tape |
| Shed power (basic) | From £350 | Dedicated circuit, RCBO, shed CU, sockets & lighting |
| Garden office electrics | From £650 | Sub-board, multiple circuits, RCD, EIC |
| Garden lighting circuit | From £250 | Switched circuit, IP65 fittings, RCBO, EIC |
All prices are indicative from prices and include labour, materials, testing, certification, and Part P notification. VAT at 20% applies. Final price depends on cable run length and site conditions. 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?
No. Installing a new outdoor socket is notifiable work under Part P of the Building Regulations because it involves a new circuit or an extension into a special location (outdoors). It must be carried out by a registered electrician. An unregistered installation cannot be self-certified and may invalidate your home insurance.
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?
- NAPIT Approved -- all work self-certified and notified to Building Control on your behalf
- Outdoor electrical specialists -- SWA cable runs, buried circuits, IP-rated accessories throughout
- City & Guilds 18th Edition qualified
- CHAS Accredited
- Fixed prices -- written quote before work starts, no day-rate surprises
- Local -- Wells, Shepton Mallet, Bath, Frome, Glastonbury and surrounding villages