What IP rating do outdoor wall lights need in the UK?

An IP rating is a two-digit code set by BS EN 60529. The first digit covers protection against solids — dust, fingers, insects — and the second covers water ingress. IP44 means the fitting resists solid objects over 1 mm and water splashed from any direction, which is the baseline for anything mounted on an exterior wall in the UK. Anything rated below IP44 should not be installed outside at all, regardless of how sheltered the position looks. When specifying outdoor wall lights, the rating matters more than the style, because a fitting that fails its seal lets moisture reach the lampholder and terminals, corroding connections and eventually tripping the RCD on the consumer unit. A caged IP44 fitting such as the Cipher pairs a robust enclosure with the correct ingress protection, which is why that construction is common on coastal and exposed sites. The rating is verified at manufacture, so check the datasheet rather than relying on the sales listing — reputable manufacturers print the IP code on the backplate and state it in the installation instructions.

For a typical front door under an overhanging roof, a canopy or a recessed porch, IP44 is adequate and is what most manufacturers design their domestic range around. The overhang intercepts the worst of the rain, and the fitting only sees splash and wind-driven drizzle. Step up to IP65 when the wall faces open country, sits within a few miles of the coast, or mounts above head height with no shelter above it — those positions take the full force of driving rain, and an IP44 gasket will weep eventually. BS 7671 also treats zones outside the building differently: anything in zone 1 of a bathroom-style wet area needs higher protection, but standard exterior walls fall outside those zones, so the practical decision is exposure, not regulation. Choose LED fittings with a replaceable gasket and stainless or powder-coated screws, because the fixings corrode before the seal does on cheap units. Efficient lamps also matter if the light runs on a photocell all night — lighting choices feed into a home's energy performance, which assessors record when you find an energy certificate for a property.

Specify IP65 whenever the fitting sits on a gable end, an unsheltered garden wall, a garage flank, or anywhere the prevailing weather hits it directly. The second digit 6 means the enclosure withstands a 12.5 mm nozzle jet from any direction — a fair proxy for storm-force rain driven at a wall. IP67 and IP68 exist but relate to immersion, which a wall light never experiences, so paying for them buys nothing in this application. IP65 fittings also tend to have better-sealed cable entries; insist on a glanded entry or a rear cable route through the wall rather than a top entry with loose tape, because the cable entry is the usual failure point even on well-rated units. Mount the fitting at least 2.1 metres above finished ground level where practical — it keeps the lens out of splash zone and out of reach. Finally, aim the light down and shield it: over-bright fittings spilling across boundaries are a statutory nuisance, and the government's guidance on light pollution sets out how local authorities handle complaints, so a well-aimed IP65 fitting solves both problems at once.

An IP rating describes the fitting as manufactured, not as it stands five years later, so maintenance determines whether the rating still holds. Inspect the gasket between the backplate and the body every autumn: silicone and foam seals harden under UV and thermal cycling, and once they take a permanent set, water tracks in on the first horizontal rain. Replace the gasket or the whole fitting when the seal no longer springs back. Check the cable gland and any blanking plugs — an unused entry left open voids the rating entirely. Clean the lens with a damp cloth rather than a pressure washer, because jetting a fitting at close range exceeds what most IP44 and even IP65 enclosures are tested for. After any repaint or rendering work on the wall, confirm the backplate flange still sits flat against the surface; a proud bead of render behind one corner creates a gap that wicks water in. On sites near the sea, rinse salt deposit off the fixings twice a year. These checks take minutes and prevent the common failure mode: corrosion inside the lampholder that no amount of exterior sealing can undo.