What are Bathroom Zones?

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Downlight Above Shower: What Are Bathroom Zones?

The bathroom is split up into three different zones. The zonal requirements of each area are mainly dependent upon the risk level of water getting close to or touching the electrical supply. This would cause damage to the installation but more importantly poses a risk of electric shock.

It is essential to ensure all electrical fixtures are installed safely to prevent electricity-related hazards, especially in wet areas – whether you’re fitting a downlight above the shower, over the bath, or in the rest of the bathroom. The three bathroom zones are:

Zone 0
This zone requires a minimum of IP68. It is the area within the bath tub or shower tray where fittings can be fully submerged. Only 12V SELV (Safety Extra Low Voltage) equipment can be used.
Zone 1
Requires a minimum of IP44. This is the area directly above a bath or within a shower cubicle, up to 2.25 m in height. A downlight above a shower will almost always be in Zone 1.
Zone 2
Same as above, requires a minimum of IP44. This is the area extending 0.6 m horizontally outside of Zone 1 around the bath or shower, up to 2.25 m in height.

For areas outside of these zones (formerly known as Zone 3), normal rules apply and no specific IP rating is required. However, when installing bathroom downlights we recommend installing all of them to at least IP44 or above so they match and offer good protection from steam and moisture.

Ceiling-mounted downlights provide a sleek, unobtrusive look and can sit flush with the ceiling surface, contributing to a modern bathroom design. They will have a higher resistance to steam, which could otherwise cause lamp failure – especially if expensive LEDs have been used. It could cost around £2 extra for an IP rated downlight or £4 to replace an LED, so investing in the right IP rating from the start is a smart choice.

Most integrated LED downlights are IP65 rated as standard, so you don’t always get a choice. If in doubt, install IP65 downlights throughout your bathroom, as these are suitable for use in all bathroom zones due to their higher protection rating.

All circuits in a bathroom should be protected by a 30 mA RCD (Residual Current Device). Although this is now common practice and is a requirement of Part P of the Building Regulations, it is still worth double checking, especially in older buildings.

To fully understand bathroom zones you should first have knowledge of IP ratings. IP stands for International Protection but is more commonly known as Ingress Protection. When an “X” is used in place of a digit, it means that protection against solids or liquids (depending on which position it occupies) is not important or not specified.

There are a variety of fixtures available for bathroom use, such as downlights, ceiling lights and wall lights, each with different IP ratings to suit specific zones and requirements.

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IP Ratings Explained

An IP rating is a number that is given to specify the level of ingress protection of an enclosure or piece of electronic equipment. These ratings are determined by specific tests carried out by the manufacturer of the product or in an approved test laboratory.

The IP number is composed of two digits: the first referring to the level of protection against solid objects such as dust, and the second against liquids such as water. The higher the number the better the protection level will be. Here are the main ones featured on this website:

IP20 – touch proof
The “2” stands for protection against solids up to 12 mm (based on a person’s finger).
The “0” stands for no resistance to water.
IP44 – limited water resistance
The first “4” stands for protection against solids down to 1 mm.
The second “4” stands for protection against water sprayed from all directions, i.e. resistant to splashes of water.
IP65 – water resistant
The “6” stands for total protection against dust.
The “5” stands for protection against low pressure jets of water, e.g. a pressure washer.
IP67 – submersible
Can be temporarily submersed in water for short periods of time, from depths of 150 mm to 1 metre.
IP68 – submersible
Can be left constantly under water. This would typically be a fully sealed unit.

LED downlights are a popular choice for bathrooms because they are energy efficient, long lasting and help reduce overall energy consumption, making them a cost-effective and environmentally friendly option.

Conflicting Information

Don’t believe us or getting told conflicting information? Here is an official table from the Lighting Industry Federation:

bathroom electrical zones table

More information about bathroom zones and wiring regulations can be found on the Voltimum website which includes an article written by the IET (Institute of Engineering and Technology).

Colour Temperature in Bathroom Downlights

When planning your bathroom lighting, one of the most important yet often overlooked factors is colour temperature. Measured in Kelvin (K), colour temperature determines the shade of white light produced by your bathroom downlights, and it can dramatically influence the mood, style and functionality of your space.

For bathroom downlights, the most popular choices are:

2700K – Extra Warm White
Similar to traditional halogen or incandescent lighting. It has a cosy, warm glow and is ideal if you want a softer, more ambient feel in the bathroom.
3000K – Warm White
Slightly cleaner than 2700K without being too clinical. A great all-round bathroom option that still feels warm but with a bit more clarity.
4000K – Cool / Neutral White
A clearer, whiter and brighter light. Popular for modern bathrooms or areas where you want better visibility, such as shaving or applying makeup.
5000K–6500K – Daylight
A very bright, crisp white with a slight blue tint. Offers a daylight-style effect, though less commonly used in UK bathrooms.

Task lighting around mirrors often benefits from warm or neutral white downlights, as these colour temperatures are flattering to skin tones and help create a calming, spa-like atmosphere. If you prefer a modern, energising feel in your bathroom, cool white or neutral white downlights can help you achieve that clean, fresh look.

Integrated LED downlights are a popular choice for bathrooms, as many models offer adjustable colour temperature settings, allowing you to switch between warm white, neutral white and cool white to match your mood or the time of day.

Consistency is key when it comes to colour temperature—matching your downlights throughout the bathroom ensures a harmonious and cohesive style, whether you’re aiming for a relaxing retreat or a sleek, contemporary space. While the colour temperature you choose won’t affect the safety features of your lighting, it’s still essential to select IP rated and, where required, SELV downlights to protect against solid objects, water ingress and the risk of electric shock.

Ultimately, the right colour temperature for your bathroom lighting depends on your personal style, the activities you do in the space and the atmosphere you want to create. By considering these factors and choosing LED downlights with the right features and IP ratings for the correct bathroom zone, you can design a bathroom that’s not only functional and safe, but also perfectly suited to your needs.