Garden and Outdoor Electrics: Safety and Regulations for Homes in England

Electricity and weather do not mix well, so outdoor electrics need more care than the wiring inside your home. Whether you are using a hedge trimmer, running power to a garden room or lighting a patio, the same principles apply: protect the supply, use the right equipment and let a competent person handle fixed installations. This guide sets out the main points for homes in England, including those in Blackpool and the Fylde where salt air and wet weather are common.

The basic risks

Outdoors, equipment is exposed to rain, damp ground, dirt, temperature changes and physical damage. Water makes electric shock more likely, and a person standing on wet ground or holding a metal tool is in a more dangerous position than someone indoors. Cables can be cut by mowers or hedge trimmers, trodden on or damaged by garden tools.

Electrical Safety First's garden advice stresses a few simple rules, which we repeat here.

RCD protection

Use a residual current device, or RCD, with all outdoor electrical equipment. If you do not have one built into your consumer unit, a plug-in RCD is a minimum precaution. NICEIC states that all outdoor socket outlets should be protected by an RCD, and that outdoor sockets, switches and appliances should be protected in this way. See our guide to tripping circuits and RCDs for how to test one and what to do if it trips.

A plug-in RCD is a useful extra for portable tools, but it is not a replacement for proper protection on fixed outdoor circuits, which an electrician should provide.

Extension leads and cable reels

Only use extension leads, cable reels and connectors that are suitable for outdoor use. Choose leads with weather-resistant, moulded connections and keep plugs and connections undamaged. Unwind cable reels fully and use one fitted with a thermal cut-out, because a coiled reel can overheat under load. Never plug an extension lead into another extension lead.

Keep leads and plugs dry and position them so that they are not likely to be damaged or to be a trip hazard. Do not run leads through doors or windows that can be closed on them.

Outdoor sockets and fixed equipment

NICEIC says there are no specific regulations in BS 7671 for garden electrics beyond the general rules, but common sense applies. A fixed outdoor socket should be designed for outdoor use, with a suitable IP rating, which is a measure of how well the enclosure keeps out dust and water. NICEIC notes that most outdoor sockets are rated IP66, which means they are dust tight and protected against powerful jets of water.

Fixed outdoor sockets should be installed by a competent electrician, not by DIY, because the work is a modification of the installation. A new outdoor circuit is likely to be notifiable. See our Part P guide.

Garden lighting

Fixed outdoor light fittings should be suitable for the conditions, and NICEIC gives IP44 as the minimum rating. Low-voltage garden lights may have a transformer that should be kept dry and be installed according to the manufacturer's instructions.

Think about neighbours as well as safety. NICEIC notes that Part L of the Building Regulations in England and Wales says that gardens should not be over-illuminated, to avoid light pollution, and that fixed external lights can have automatic controls that switch them off in response to daylight and movement. Inconsiderate lighting can be a statutory nuisance under environmental law.

Ponds and water features

Water raises the risk of electric shock. Electrical Safety First advises buying pumps from a reputable retailer, installing them in line with the instructions and protecting the cables from accidental damage. A pond pump supply should be protected by an RCD, and the RCD should be tested at least every three months. If a fault appears, switch off the supply to the pump straight away and have it repaired by a registered electrician.

NICEIC gives IP44 as the minimum rating for equipment used with a garden pond, and says to keep hoses, sprinklers and paddling pools well away from electrical equipment.

Buried cables and digging

Cables that run across a garden should be suitable for outdoor use and buried deep enough to avoid damage from garden tools. NICEIC does not give a depth, and the appropriate depth, type of cable and protection depend on the installation, so your electrician should specify them. Never install buried cable yourself.

Before you dig, take care. Electrical Safety First warns that cables, gas pipes and water services may be buried in the garden. Keep a record of where cables run and, if you have a new installation, ask the electrician for a plan or photographs showing the route.

Sheds, garden rooms and garages

A shed or garden room that needs lights, sockets or heating needs a supply from the house. NICEIC explains that an electrician will typically run a cable from the house, buried directly in the ground or run through an underground conduit or duct. The existing consumer unit may need upgrading, or a separate unit may be fitted in the outbuilding, to handle the load. See our consumer unit guide.

Do not run an extension lead from the house to power an outbuilding permanently. It is not designed for that and it can be a fire and shock risk.

The same principles apply if you are planning a charging point on a detached garage or a driveway post, which may need longer cable runs and a different earthing arrangement. See our EV charger guide.

Is garden electrical work notifiable?

NICEIC states that under Part P of the Building Regulations in England and Wales, some garden electrical installations have to be notified to local authority building control. A new circuit to an outbuilding is a typical example. A registered electrician, who is a member of a competent person scheme, can self-certify the work instead and arrange the notification, and you receive a certificate for your records.

Power tools and the weather

For tools used in the garden, Electrical Safety First's advice includes the following.

• Do not use electrical equipment outdoors in damp conditions. Wait until it is dry.
• Keep children and pets well away from electric garden tools when they are in use, and always know where the cable is.
• Switch off and unplug items before cleaning, adjusting or checking them.
• Store electric tools in a dry place such as a shed or garage, and check for water damage before using them.
• Wear sensible protective clothing, including footwear that protects your feet.

Checking your outdoor electrics

Once a year, preferably in spring, look over outdoor sockets, lights and leads. Look for cracked covers, water inside fittings, corrosion, loose fixings and damaged cable. Test the RCD that protects them. If you find anything that looks wrong, switch off the supply and call a registered electrician. Outdoor circuits should also be included in any periodic inspection, see our EICR guide.

Talk to us

We can help with outdoor sockets, lighting, supplies to outbuildings and checks on existing circuits. See our domestic electrical page, call 01253 364101 or send an enquiry.