Bathroom Lighting IP Ratings and Zones Explained for Buyers

A customer once sent me a photo of a beautiful brass pendant hanging thirty centimetres above a freestanding bath, asking why the bulb kept blowing every few weeks. The fitting was rated IP20, designed for a dry living room, and it was breathing in steam every evening. Choosing bathroom lighting by IP rating is the one buying decision in the house where looks have to come second, and a few minutes with the zone diagram saves both money and a real safety risk.

This guide explains what the IP numbers mean, how bathroom zones work, which rating you need in each spot, and where you still have room to choose something decorative. The zone rules below follow the UK wiring regulations, which are close to the international standard used across much of Europe. If you live elsewhere, the logic is the same but check your local code before buying.

What an IP Rating Actually Tells You

IP stands for ingress protection. The code has two digits, and each one measures something different.

First digit, solids: from 0 to 6. A 2 means fingers cannot reach live parts. A 4 keeps out objects over one millimetre, such as wires. A 6 is fully dust tight.
Second digit, water: from 0 to 8. A 4 resists splashing from any direction. A 5 resists low pressure jets. A 7 survives temporary immersion.

An X in place of a digit simply means that part was not tested. IPX4 tells you the fitting resists splashes but says nothing about dust. For bathrooms, the second digit is the one that matters.

Bathroom Zones and the IP Rating Each One Needs

A bathroom is divided into zones based on how close a fitting sits to water. Measure from the bath or shower tray, not from the room's walls.

Zone	Where it is	Minimum rating	What to buy
Zone 0	Inside the bath or shower tray itself	IPX7	Low voltage sealed fittings only, rarely used
Zone 1	Directly above the bath or tray, up to 2.25 metres high	IPX4, IP65 if jets can reach it	Sealed downlights, flush ceiling fittings
Zone 2	60 centimetres outward from the edge of Zone 1, and around washbasins	IPX4	Bathroom ceiling lights, mirror lights, wall lights rated IP44
Outside zones	Anywhere further away	No set minimum	IP44 recommended, decorative pieces possible

A walk in shower without a tray counts as Zone 1 for a radius of 1.2 metres around the shower head, which catches many people out in open wet rooms.

Where a Decorative Light Can Still Work

The good news is that most bathrooms have space outside the zones. In a room around three metres long with the bath along one wall, the opposite half of the ceiling is often outside Zone 2 entirely. That is where a small chandelier or a statement pendant can hang.

Even there, buy something with at least IP44 if you can. Steam does not respect zone lines. Rooms without strong extraction can sit at very high humidity after a hot shower, and moisture settles on any cold metal. Look for glass or sealed shades rather than open fabric, and avoid fittings with exposed lamp holders. If the ceiling is under about 2.4 metres, the steam problem is worse and I would stay with a flush fitting.

Why a Higher Rating Is Not Always Better

Many retailers push IP65 for every position, on the basis that more protection is safer. It is a reasonable instinct, but buying the highest number everywhere has real downsides.

Fully sealed fittings trap heat. With older halogen lamps this shortened their life considerably, and even LED drivers age faster when they sit in a hot, airless housing. Sealed fittings can also hold condensation inside the diffuser, leaving a fogged ring of water that is impossible to clean without taking the light down. And the choice of designs shrinks sharply above IP44, which pushes people towards plain plastic domes they did not want.

Match the rating to the zone. Use IP65 where water jets can actually reach the fitting, such as above a shower or in a wet room. Use IP44 elsewhere. Spend the saved money on better light quality.

Reading the Box Before You Pay

The IP rating should be printed on the packaging, the product page and the fitting itself, usually on a label inside the base. If it only appears in a marketing headline and nowhere on the specification, be cautious. My guide to reading a light fixture spec sheet shows where to find the rating and what else to check.

Watch for these common traps:

Rated only when fitted correctly: many downlights achieve IP65 from below, but only with the supplied gasket in place.
Front rated, back not: some recessed fittings are sealed at the face but open behind, which matters in a bathroom ceiling with a loft above.
Bulb sold separately: the fitting may be rated, but a cheap replacement lamp in a different size can stop the shade sealing.
Mirror lights with sockets: shaver sockets must be the dedicated bathroom type, not a standard plug socket.

Choosing the Light Itself

Once safety is settled, the bathroom is where light quality pays off most, because you look at your own face under it every day. Aim for a colour temperature of around 3000K for general light and a high CRI of 90 or above at the mirror, so skin tones look natural. Our guide on warm or cool light explains how colour temperature changes a small room.

Layer it. One ceiling light alone casts shadows under the eyes at the mirror. Add a light on each side of the mirror at roughly face height, or a backlit mirror, for even light. A low level night light on a separate switch is useful for late night trips.

Installation and Who Should Do It

Bathroom lighting work in the UK is notifiable in most cases where new circuits are added or work is done in the zones, and all bathroom circuits should be protected by a 30mA RCD. Even if your fitting is a direct swap, the combination of water and electricity is a good reason to have a qualified electrician do the job. I have written separately about why a licensed electrician still matters for a simple fixture swap.

Frequently Asked Questions

Can I put a chandelier in a bathroom?

Yes, if it hangs outside Zones 1 and 2, the ceiling is high enough and the room has good extraction. Choose glass or metal with sealed lamp holders, and ideally an IP44 rated design.

Is IP44 enough above a shower?

For most showers in Zone 1 with no direct jets reaching the ceiling, IP44 meets the minimum. Where a rainfall head or body jets can spray the fitting, choose IP65.

Do LED strips in bathrooms need an IP rating?

Yes. Strips near the bath or shower need a sealed, silicone coated version rated IP65 or IP67, and the driver should sit outside the zones or in a ventilated cupboard.

The Rule to Take Shopping

Sketch your bathroom, mark the bath, shower and basin, and draw Zone 1 and Zone 2 around them. Buy IP65 where water hits, IP44 in the zones and near them, and save decorative pieces for the dry corner of the ceiling. Do that and the only hard choice left is which design you like best.