Garden electrical installations require armoured cable, correct burial depths, mandatory 30mA RCD protection under Regulation 411.3.3, and IP-rated outdoor equipment. This guide covers everything from cable selection to Part P notification for outdoor circuits.
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Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
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Garden and outdoor electrical installations are more demanding than indoor domestic work because of the environmental conditions — weather exposure, moisture, mechanical damage from gardening, and the increased risk of electric shock outdoors where the earth is a better conductor than a dry indoor floor.
BS 7671 contains specific requirements for outdoor electrical installations, including Section 714 (outdoor lighting installations) and the general requirements of Part 4 and Part 5 for cable selection, protection against the effects of weather, and RCD protection. All new garden and outdoor circuits in dwellings are notifiable under Part P of the Building Regulations.
The three critical areas of compliance for garden electrical work are: using the correct cable type and burial depth, providing mandatory RCD protection, and using IP-rated equipment suitable for outdoor use. Getting any of these wrong creates a risk of electric shock or fire.
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Two sections of BS 7671 are particularly relevant to garden and outdoor electrical work:
Section 714 applies to permanent outdoor lighting installations, including garden lighting, pathway lighting, security lighting, and external building illumination. Key requirements include: RCD protection for all outdoor lighting circuits, IP-rated luminaires appropriate to their location, and correct cable selection for outdoor use. Section 714 also covers festoon and decorative lighting, but temporary seasonal outdoor lighting connected via a standard socket outlet is generally treated under the socket outlet RCD protection requirements rather than Section 714.
Section 705 applies to agricultural and horticultural premises, which includes outbuildings on farms, stables, and market garden installations. It requires 30mA RCD protection for all socket outlets, specific requirements for luminaires in locations where livestock is present (to avoid damage from animals), and earthing requirements for farm buildings. For domestic outbuildings that are not on agricultural premises, Section 705 does not directly apply, but its principles (robust installation, IP-rated equipment, earthing) represent good practice.
For most domestic garden electrical work, the general requirements of BS 7671 (Part 4 protection requirements, cable selection from Part 5, and the RCD rules in Regulation 411.3.3) are the primary applicable standards. Section 714 applies specifically where a permanent outdoor lighting installation is being created.
Steel Wire Armoured (SWA) cable is the standard for buried garden and outdoor circuits. The steel wire armour provides mechanical protection against accidental damage from spades, forks, and other garden tools, and also provides an earth continuity path when correctly terminated.
2-core SWA (for single-phase supplies with earthing via the armour) or 3-core SWA (for single-phase supplies where a separate CPC is required). The armour must be connected to earth at both ends via suitable SWA glands. SWA cable is available in conductor sizes from 1.5mm to 300mm and above.
SWA cable must be terminated using appropriate brass SWA glands at both ends. The armour is clamped between the inner and outer cones of the gland and must make good electrical contact to provide the earth continuity path. Inside the consumer unit or distribution board, the armour is terminated to the earth bar via the gland plate. Outside (at the garden socket or shed consumer unit), the armour is connected to the earth terminal of the enclosure.
Garden cable must be sized for the load it supplies, accounting for burial depth (which reduces the cable's ability to dissipate heat). SWA cable buried in the ground can carry more current than the same cable installed in thermal insulation. Use the cable sizing calculator and check voltage drop for the cable run length.
The minimum burial depth for cables in gardens is specified to protect cables from accidental damage during routine gardening. These depths are the minimum — deeper installation provides greater protection.
| Location | Minimum Depth | Notes |
|---|---|---|
| Garden (general) | 0.5m (500mm) | Cable tiles and warning tape above the cable |
| Under paved areas (patio, paths) | 0.45m (450mm) | Paving provides some mechanical protection |
| Under driveways (vehicles) | 0.6m (600mm) preferred | Or use heavy steel conduit for additional protection |
| Where depth cannot be achieved | Any depth | Additional mechanical protection (conduit) required |
Mark the cable route on an as-installed plan — cable routes should be recorded on an as-installed drawing given to the homeowner. This is essential for future gardening or building work. Cable route maps should show the route from the consumer unit to each termination point with accurate dimensions from fixed reference points.
Regulation 411.3.3 of BS 7671 is the mandatory RCD protection requirement for outdoor socket outlets. It states that socket outlets rated up to 20A that are used outdoors (for equipment used outdoors) must be protected by an RCD with a rated residual operating current not exceeding 30mA.
This requirement is non-negotiable — there is no circumstance in which an outdoor socket outlet in a domestic garden can be unprotected by a 30mA RCD. The reason is straightforward: outdoors, a person using electrical equipment is often standing on damp ground, which provides a better earth connection than a dry indoor floor. This means that a much smaller fault current can cause a fatal shock, and 30mA RCD protection is essential to disconnect within the time limits required by BS 7671 before a fatal shock can occur.
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Outdoor socket outlets must meet specific standards for weatherproofing and safety. The requirements are:
Elec-Mate's EIC app lets you complete the Electrical Installation Certificate for garden and outdoor circuit installations on site.
Try it free for 7 daysSupplying a garden shed with electricity is one of the most common garden electrical jobs. Best practice involves a dedicated circuit from the main consumer unit, SWA cable buried at the required depth, a consumer unit in the shed for local protection, and earth electrode provision if required.
The supply to the shed should be a dedicated circuit from the main consumer unit, protected by an RCBO or MCB of appropriate rating. Do not share the garden shed supply with other circuits. Size the cable for the maximum load in the shed — typically a 20A or 32A circuit depending on whether power tools, heaters, or EV chargers will be used.
The shed should have its own small consumer unit (typically 4 to 6 way), which provides local overcurrent protection and isolation. This allows the shed's individual circuits (lighting, sockets, specific equipment) to be controlled and protected independently.
For sheds that are not connected by a metallic armouring to the main building earth (TT system), an earth electrode (earth rod) must be installed at the shed to provide a local earth reference. The electrode resistance should be measured and must be low enough for the RCD to operate within the required disconnection time. See the outbuilding electrical supply guide for TT earthing details.
All new garden and outdoor circuits are notifiable under Part P of the Building Regulations in England. This includes:
Register with an approved competent person scheme to self-certify garden electrical work and issue the Electrical Installation Certificate on site. This satisfies Part P without building control involvement.
Garden electrical work is high-value, repeat-business territory. Homeowners investing in garden landscaping, outdoor entertaining spaces, and garden offices are willing to spend on quality electrical installations. A professional job — correct cable, correct depth, IP-rated equipment, properly certified — builds lasting customer relationships.
Long garden cable runs can cause significant voltage drop. Use the cable sizing calculator to confirm the SWA cable size is adequate for the run length, and check voltage drop with the voltage drop calculator.
Issue the Electrical Installation Certificate on site before you leave. Include the cable route description, burial depth, and the as-installed details. The homeowner gets their certificate immediately and your Part P self-certification is processed automatically by your scheme.
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