Bathroom lighting is one of those decisions that looks purely decorative until you start working out exactly where the bath, shower and electrical fittings will sit.

In a UK bathroom, the position of a light matters because bathrooms are divided into electrical zones around the bath and shower. The IP rating on a fitting tells you how well it is protected against solids and water.

The important point is not simply to buy something labelled a “bathroom light”.

You need a fitting that is suitable for the exact position in which it will be installed.

When lighting forms part of a complete bathroom installation, the positions of the lights, extractor fan, illuminated mirror and other electrical equipment should ideally be considered before first-fix electrics and before the ceiling and wall finishes are completed.

The answer in 30 seconds

For most homeowners, these are the important points:

  • Zone 0 is inside the bath or shower tray itself.
  • Zone 1 is the area directly above the bath or shower.
  • Zone 2 extends 600 mm beyond the boundary of Zone 1.
  • In a shower without a tray, such as some wet-room layouts, the zone arrangement is different.
  • Zones 1 and 2 normally require at least IPX4 protection.
  • Where water jets are likely, IPX5 protection is required.
  • Zone 0 requires equipment suitable for immersion, normally IPX7.
  • IP44 is therefore suitable for many bathroom positions.
  • IP65 gives greater water protection and is commonly used above showers.
  • Being outside the formal zones does not mean any light fitting is automatically a good bathroom choice.

The exact electrical requirements should be confirmed by the electrician carrying out the installation.

Why bathroom lighting has different rules

Bathrooms are treated differently from ordinary dry rooms because water and electricity are being used in close proximity.

BS 7671, commonly known as the IET Wiring Regulations, treats a location containing a bath or shower as a special location.

Instead of simply saying that the whole bathroom is dangerous, the regulations define specific areas around the bath and shower.

These are known as Zones 0, 1 and 2.

The closer electrical equipment is to the area where somebody can be wet or directly exposed to water, the more carefully the equipment and installation need to be selected.

This is why two identical-looking lights in the same bathroom can have different requirements depending on where they are positioned.

Zone 0: inside the bath or shower

Zone 0 is the area inside the bath or shower tray that can contain water.

It is the most restrictive bathroom zone.

Any electrical equipment installed here has to be specifically suitable for that environment.

The required water-ingress protection is IPX7, which means protection against temporary immersion in water under the relevant test conditions.

Zone 0 equipment also has specific extra-low-voltage requirements.

For an ordinary domestic bathroom, there is rarely a reason to install conventional ceiling lighting in Zone 0 itself.

Most homeowners choosing bathroom lights will be dealing with Zones 1 and 2 instead.

Zone 1: directly above the bath or shower

Zone 1 covers the area immediately above Zone 0.

Its upper boundary extends to the higher of:

  • 2.25 metres above finished floor level; or
  • the height of the highest fixed shower head or water outlet.

For a conventional bath or shower tray, the horizontal boundary generally follows the bath or tray.

This is why a recessed spotlight positioned directly above a shower will commonly be considered a Zone 1 fitting.

Does Zone 1 have to be IP65?

No — not automatically.

This is probably the biggest source of confusion when homeowners start searching online for bathroom lighting.

You will find plenty of lighting retailers saying something similar to:

Zone 1 requires IP65.

That is a useful simple shopping recommendation, but it is not the complete technical rule.

The IET states that equipment installed in Zones 1 and 2 normally requires at least IPX4, or IPX5 where water jets are likely.

An IP44 fitting therefore provides the X4 level of water protection.

An IP65 fitting has a second digit of 5, so it provides greater protection against water.

That is why IP65 downlights are extremely common above showers and why an electrician or bathroom installer may choose them even where the minimum water-ingress requirement could technically be lower.

They are a sensible practical specification.

But it is more accurate to say:

IP65 is commonly used and often a good choice in Zone 1; it is not the automatic minimum rating for every possible Zone 1 position.

The fitting's instructions, its exact position and the likely exposure to water all still matter.

Zone 2: the next 600 mm

Zone 2 extends 600 mm horizontally beyond the boundary of Zone 1.

Its vertical limit follows the same principle as Zone 1.

Equipment in Zone 2 normally requires at least IPX4 protection, increasing to IPX5 where water jets are likely.

This is one reason you commonly see IP44 used for bathroom products such as:

  • ceiling lights;
  • wall lights;
  • illuminated mirrors;
  • mirror lighting;
  • certain bathroom electrical accessories.

Again, the IP rating is only one part of the decision.

The product must also be suitable for its actual location and installed according to the manufacturer's instructions.

Does a washbasin have its own bathroom zone?

Not in the same way as a bath or shower.

This is another area where online bathroom-zone diagrams can be misleading.

The formal Zones 0, 1 and 2 are defined around the bath and shower, not simply around every source of water in the room.

The IET specifically states that BS 7671 does not set a general minimum distance between electrical equipment and a washbasin or sink.

That does not mean electrical equipment can simply be put anywhere beside a basin.

Electrical equipment still has to be suitable for the environmental conditions.

A mirror or light positioned immediately beside taps may clearly be more exposed to splashing than a fitting on the opposite side of a large bathroom.

So the sensible process is:

  1. establish the formal bath and shower zones;
  2. look at the real position of the fitting;
  3. consider how likely it is to be splashed or exposed to water;
  4. select suitable equipment accordingly.

What happens with a walk-in shower or wet room?

The zoning arrangement changes where a shower does not have a conventional shower tray or basin.

For this type of shower, Zone 1 extends 1.2 metres horizontally from the fixed shower head or water outlet.

There is no separate Zone 2 surrounding that shower arrangement in the same way.

This can be particularly relevant when planning a wet room installation, because lighting, extractor fans, illuminated niches and other electrical items may all be affected by the final shower position.

The same principle matters when planning a walk-in shower installation, particularly where ceiling lighting is positioned directly above the showering area.

It is another reason why the shower layout and electrical design should be considered together rather than independently.

Moving a shower after first-fix electrics have already been completed can change the zone in which a fitting is located.

What does an IP rating actually mean?

IP means Ingress Protection.

You will normally see it followed by two numbers, for example:

IP44

The two numbers describe different things.

The first number relates to protection against solid objects.

The second number relates to protection against water.

For bathroom lighting, that second number is particularly important.

What does IP44 mean?

With an IP44 fitting:

  • the first 4 describes its protection against solid objects;
  • the second 4 means it is protected against splashing water.

This is why IP44 is one of the most common ratings on bathroom lighting and illuminated mirrors.

An IP44 light is splash-resistant.

That does not mean it is designed to be submerged in water or subjected to powerful water jets.

What does IP65 mean?

With an IP65 fitting:

  • the 6 describes a very high level of protection against dust;
  • the 5 means protection against water jets.

IP65 therefore gives a greater level of water protection than IP44.

For this reason, IP65 recessed downlights are commonly installed around shower areas.

They are also useful when the same style of downlight is being used throughout a bathroom and some of the lights happen to sit in more demanding positions than others.

Using the higher-rated fitting across the ceiling can sometimes produce a simpler and more consistent specification.

What does IP67 mean?

With an IP67 fitting:

  • the 6 relates to dust protection;
  • the 7 relates to protection against temporary immersion in water.

The X7 level of water protection is the level relevant to Zone 0.

Products designed for genuinely submerged or Zone 0 applications therefore need substantially greater protection than a normal splash-resistant bathroom light.

What does the X mean in IPX4?

You may see requirements written as:

IPX4

or:

IPX5

The X does not mean that the product has failed a test.

It simply means that, for the particular requirement being discussed, the first digit is not being specified.

The important figure in this context is the water-protection digit.

For example:

  • IP44 meets an IPX4 water-protection requirement because its second digit is 4.
  • IP65 exceeds IPX4 because its second digit is 5.
  • IP67 has a water-protection digit of 7.

This is also why comparing only the words “bathroom rated” on two product boxes does not tell you very much.

The actual IP code matters.

Can you use IP44 directly above a shower?

Potentially, depending on the exact installation.

If the position requires IPX4 protection, an appropriately designed IP44 fitting provides that level of water protection.

Where water jets are likely, a higher rating is required.

In practice, IP65 downlights have become a very common specification for shower areas because they provide greater protection and suitable products are readily available.

The useful distinction is therefore:

IP44 may meet the technical ingress requirement in an appropriate Zone 1 position, while IP65 is often the more practical specification above a shower.

The final decision belongs with the electrician assessing the actual installation.

Can you use a normal light outside the bathroom zones?

Potentially, but being outside Zones 0, 1 and 2 is not a free pass to use any fitting without considering the environment.

Outside the zones there is not the same specific Section 701 IP requirement.

However, the fitting must still be suitable for where it is installed.

Think about two very different bathrooms.

One is a large, well-ventilated room where a ceiling light is several metres away from the bath.

The other is a compact shower room where steam and condensation build quickly and almost every surface becomes damp.

Both lights might technically sit outside the formal zones, but they are not necessarily exposed to the same conditions.

This is why bathroom-rated fittings are often still a sensible choice outside the formal zones.

Bathroom lighting should be planned before first fix

One of the easiest bathroom mistakes to avoid is leaving the lighting layout until the room is nearly finished.

The positions of electrical fittings can be affected by:

  • the bath position;
  • shower-tray position;
  • shower-head position;
  • wet-room layout;
  • ceiling height;
  • floor and ceiling joists;
  • illuminated mirrors;
  • extractor-fan position;
  • niches;
  • cabinets;
  • other ceiling features.

The electrical first fix needs to accommodate those decisions.

Our guide to the correct order of works for a bathroom renovation explains why the electrical and plumbing first fix happen before the finished surfaces and final fittings go in.

Changing the lighting plan after plastering, cladding or bathroom tiling has been completed can turn a straightforward electrical job into unnecessary remedial work.

Good bathroom lighting is not just four spotlights

Once the electrical requirements are dealt with, there is still plenty of freedom in the design.

A good bathroom normally benefits from thinking about what the light actually needs to do, rather than simply spacing four spotlights evenly across the ceiling.

General ceiling lighting

Ceiling downlights or a suitable central fitting normally provide the main light for the room.

The objective should be useful, reasonably even illumination.

A common mistake is concentrating all the light in the middle of the floor while leaving important areas such as the vanity, shower or bath comparatively dark.

The bathroom layout should therefore be known before the light positions are finalised.

Mirror lighting

The mirror is one of the places where lighting quality makes a noticeable difference.

A bright spotlight directly above somebody's head can create shadows across the face.

Lighting integrated into or positioned around a mirror can provide more useful illumination for:

  • shaving;
  • make-up;
  • skincare;
  • contact lenses;
  • general grooming.

Illuminated and demister mirrors also require an electrical supply, so they should ideally be selected or at least allowed for before first fix.

Their position in relation to the bath and shower zones must also be considered.

Lighting over the shower

A correctly positioned shower light can make a significant difference, particularly with:

  • larger walk-in showers;
  • deep shower enclosures;
  • dark wall tiles;
  • shower screens that reduce light from the rest of the room.

IP65 recessed downlights are frequently used for this purpose.

The goal is to light the shower properly without creating glare directly into the user's eyes.

Feature and niche lighting

Feature lighting can work particularly well in modern bathrooms.

Options can include:

  • illuminated shower niches;
  • concealed LED lighting;
  • low-level lighting;
  • vanity lighting;
  • lighting below wall-hung furniture;
  • softer night lighting.

These features have to be considered early because cables, drivers and power supplies may need to be concealed behind finished surfaces.

The important point is that feature lighting should be planned as part of the bathroom design rather than added after the room has already been tiled and finished.

What about extractor fans and illuminated mirrors?

Bathroom electrical zones do not apply only to ceiling lights.

Depending on their position, they can also affect equipment such as:

  • extractor fans;
  • illuminated mirrors;
  • demister mirrors;
  • electric showers;
  • controls;
  • other fixed electrical equipment.

An extractor fan positioned over a bath or shower can itself be a Zone 1 installation.

The IET confirms that permanently connected equipment such as ventilation equipment can be installed in Zone 1 where the equipment is suitable and installed according to the manufacturer's instructions.

The same basic principle applies throughout the bathroom:

decide where the equipment will go first, then select equipment suitable for that location.

Do bathroom circuits need additional protection?

Bathroom electrical safety involves more than the IP rating printed on a light fitting.

BS 7671 contains additional requirements for electrical installations in locations containing a bath or shower.

Part P of the Building Regulations can also apply to bathroom electrical work in England and Wales.

Depending on the work, electrical changes may require certification or notification.

Where electrical work forms part of a Tees Valley Refurbishments Ltd bathroom project, it is carried out by a certificated electrician.

Five common bathroom-lighting mistakes

1. Buying the lights before deciding where they will go

A light can be perfectly suitable for one position and inappropriate for another.

Work out the zones and layout first.

2. Assuming every Zone 1 light legally has to be IP65

IP65 is an extremely common and sensible shower-area specification, but the underlying requirement in Zones 1 and 2 is normally IPX4, increasing to IPX5 where water jets are likely.

3. Assuming IP44 means waterproof

It does not.

IP44 provides protection against splashing water.

It is not an immersion rating.

4. Treating every diagram on a lighting retailer's website as the actual regulation

Retail diagrams can be useful for understanding the principle, but they are often simplified to help customers select products.

For technical decisions, the actual installation should be assessed against the applicable electrical requirements and the manufacturer's instructions.

5. Treating lighting as a finishing-stage decision

Lighting is visible at the end of the project, but the electrical work behind it starts much earlier.

The positions need to be planned before first fix.

So which IP rating should you choose?

There is no single IP rating that every bathroom light needs.

The answer depends on where the fitting is installed.

As a simple guide:

  • Zone 0: equipment requires IPX7 water protection and must meet the additional Zone 0 electrical requirements.
  • Zone 1: normally at least IPX4, increasing to IPX5 where water jets are likely.
  • Zone 2: normally at least IPX4, increasing to IPX5 where water jets are likely.
  • Outside the zones: there is no specific Section 701 IP minimum solely because the fitting is in the bathroom, but it still needs to be suitable for the environment.

In practical domestic bathroom design, this is why you see so many IP44 and IP65 products.

IP44 is suitable for many splash-risk positions.

IP65 provides greater water protection and is frequently chosen around showers.

The correct specification should always be based on the actual position rather than simply buying the fitting with the biggest number on the box.

The simple rule to remember

You do not need to memorise every electrical regulation to understand the basic principle.

Remember this:

The closer electrical equipment is to the bath or shower and the greater its exposure to water, the more important its protection and correct installation become.

A properly planned bathroom should therefore consider:

  1. where the bath and shower will be;
  2. where Zones 0, 1 and 2 fall;
  3. where each light, mirror and fan will sit;
  4. the appropriate IP rating;
  5. the manufacturer's installation requirements;
  6. the electrical work needed before the room is finished.

Planning lighting as part of a complete bathroom project?

Bathroom lighting works best when it is planned alongside the plumbing, shower position, ventilation, tiling and finished layout rather than treated as a separate job at the end.

Tees Valley Refurbishments Ltd provides complete bathroom fitting, bathroom installation and bathroom refurbishment, as well as walk-in showers, wet rooms and bathroom tiling.

We carry out bathroom projects across Stockton-on-Tees, including Norton, as well as Yarm, Ingleby Barwick and Middlesbrough.

If you are planning a new bathroom, we can look at the complete room at survey stage — including the bathroom layout, lighting positions, shower or bath, ventilation, plumbing and finishes — so the different parts of the installation work together.

You can request a bathroom quote using our online form, message Tees Valley Refurbishments Ltd on WhatsApp, or call 07763 408690 to discuss your bathroom project.

Technical sources

For the technical electrical information in this guide, we have referred to guidance from the organisations responsible for and professionally involved with UK electrical-installation standards:

The IET specifically confirms that equipment installed in bathroom Zones 1 and 2 normally requires a minimum rating of IPX4, or IPX5 where water jets are present. NICEIC's homeowner guidance also explains the boundaries of Zones 0, 1 and 2 and the different arrangement used for showers without a tray.

This article is intended to help homeowners understand the principles behind bathroom lighting choices. The final electrical design and installation should be assessed by a competent electrician for the individual bathroom.