What Are the Bathroom Light Zones?

Bathroom light zones are safety areas as defined by UK electrical regulations that determine what type of lighting and electrical fittings can be installed in different parts of a bathroom. These zones are determined by how likely the fitting is to come into contact with water, steam, or condensation.

Because bathrooms are wet environments the risk of electric shock is higher than in any other type of room.  Bathroom zones have been defined to help ensure that lighting and electrical products are installed safely by specifying the minimum level of water protection that is required for each area.  

Why Bathroom Zones Matter

Bathrooms will have water, steam, condensation and wet surfaces within them at different points and they all pose an increase to potential electrical safety risks.  To reduce these risks UK wiring regulations have been put in place to mitigate these risks by outlining bathroom zones.  Each zone has rules about:

• where electrical fittings can be installed
• what IP rating is required
• and what voltage or protection systems may be needed

The closer a fitting is to water, the stricter the safety requirements will be.

What Is an IP Rating?

Bathroom lighting products are usually given an IP rating.  IP stands for “Ingress Protection” and measures how resistant a fitting is to moisture, water and dust.  For bathrooms the most important number will be the second number in the IP rating as this relates to water protection.

To list a few examples:

• IP44 = splash resistant
• IP65 = protected against water jets
• IP67 = protected against temporary immersion

The required IP rating depends on which bathroom zone the lights are being installed in.

Bathroom Zone 0 

Zone 0 is the area inside the bath or shower tray itself.  This is the highest risk zone because fittings may be fully immersed in water.

Lighting or electrical products installed in Zone 0 need to be:

• low voltage only
• maximum 12V
• have a minimum rating of IP68

IP68 means the fitting is protected against temporary immersion in water.  You should not use 240v lights within this zone.

Bathroom Zone 1 Explained

Zone 1 is the area directly above the bath or shower.  It covers the area vertically from top of the bath or shower tray and the area that is up to 2.25 metres above the floor.

This zone is still considered high risk because fittings may be exposed to splashing or water sprays.

Products installed in Zone 1 will require a minimum rating of IP65.  You should always opt for low voltage lighting in this zone but mains voltage lighting can be used if the lighting is installed by a qualified electrician and regulations are followed correctly.

Bathroom Zone 2 Explained

Zone 2 extends for 0.6 metres horizontally beyond Zone 1 and around sinks and wash basins.  This area is less exposed to direct water contact but can still be affected by splashing; humidity and condensation.

Fittings in Zone 2 typically require IP44 protection at a minimum.  We would recommend using a higher IP rating if you can for additional protection.

Areas Outside the Bathroom Zones

Any bathroom area outside of zones 0, 1, and 2 are considered to be an “outside zone.”  Although the regulations are not as strict for these areas we would still recommend using a moisture resistant fitting to ensure they are safe and to reduce the risk of the lights being damaged from any moisture. 

What Bathroom Lights Are Commonly Used In Each Area?

Zone 1 Examples

• IP65 recessed downlights
• waterproof LED strips
• shower lights
• extractor fan lights

Zone 2 Examples

• illuminated mirrors
• wall lights
• decorative bathroom lighting

Outside Zones

• ceiling pendants
• decorative fittings
• ambient lighting

You should always check the manufacturer’s IP rating before installing any light in a bathroom.

There is no set example for a commonly used light within zone 0 but you will need to make sure that any light used in IP68 rated as a minimum.

Can You Install LED Strip Lights in Bathroom Zones?

Yes, but only if the LED strips are properly rated for wet environments with an appropriate IP rating for desired zone.  The LED driver or transformer should be located outside the bathroom zones whenever possible or housed within an appropriately waterproof box.

Summary

Bathroom light zones range from 0-2 and these are safety areas that determine what type of electrical fittings can be installed in which area of a bathroom.  The zones are based on how likely the fitting is to come into contact with water or moisture.  Zone 0 requires low voltage IP68 fittings, Zone 1 usually requires IP65 protection and Zone 2 commonly requires IP44 or higher.

Understanding bathroom zones will help to ensure that your lighting installation is both safe and compliant with UK electrical regulations.  Choosing suitable IP-rated lighting is essential for long lasting performance and electrical safety within any bathroom.