Outdoor lighting extends the usable hours of external spaces, helps navigation of paths and steps after dark, and can deter opportunistic intrusion by eliminating unlit areas around a property. Unlike indoor lighting, external fittings must withstand rain, temperature change, and in some positions direct water exposure.
This places specific requirements on the ingress protection (IP) of fittings and on the methods used to cable and protect the circuit. In England, outdoor locations are not automatically special locations for Part P notification.
Adding outdoor lighting to an existing circuit is not automatically notifiable; the particular work and location determine the requirement. New circuits and consumer unit replacements are notifiable.
All electrical work must meet applicable safety standards, including suitable outdoor equipment and protection, and the electrician should explain the required certification and notification arrangements. All outdoor circuits must be protected by a residual current device (RCD).
Cables buried underground must be installed at the specified minimum depth, either as armoured cable or as standard cable drawn through suitable conduit. Above-ground cable runs exposed to the weather must use material suitable for outdoor use and UV exposure.
Common outdoor lighting types include wall-mounted lanterns beside doors and gates, soffit downlighters under canopies or porches, post-mounted fittings along driveways or garden paths, and low-level ground fittings for feature illumination. Security fittings with passive infrared (PIR) motion detection are widely used at entry points; the detection zone and sensitivity should be set so that the fitting responds to movement within the intended area rather than to activity in a neighbouring property or public path.
For garden lighting schemes covering a larger area, a low-voltage system using a transformer can be used. These systems run secondary wiring at 12V or 24V rather than at mains voltage, which reduces the risk associated with cables running through planting areas.
The transformer itself remains a mains-connected device and must be installed in accordance with the wiring regulations. Before a visit, decide where you want each fitting positioned, where you want the switch or control point to be, and whether the fittings will be connected to an existing indoor circuit or a new dedicated outdoor circuit.
Note the route that any underground cable would need to take, including any paving, lawn, or planted areas it would cross.