Is It Legal to Fit a Switch Near Your Bath or Shower? Britain's Wiring Zones Simplified
Yes, you can have a light switch in a bathroom in the UK, but not just anywhere. A standard 230 V wall switch has to sit outside the bathroom zones, which in practice means well away from the bath and shower. Inside the zones, the usual answer is a ceiling pull cord switch, because the cord itself is allowed where the switch is not. Many people simply put the switch outside the door, and that is often the neatest solution.
The short answer
A normal light switch must be outside zones 0, 1 and 2, so at least 0.6 m horizontally beyond the edge of the bath or shower tray. Inside the zones, use a ceiling pull cord switch, a 12 V SELV switch, or put the switch outside the room. Every circuit serving the bathroom needs 30 mA RCD protection.
0.6 m
zone 2 extends this far beyond the bath or shower tray edge
BS 7671 Section 701
2.25 m
height of zones 1 and 2 above the finished floor
BS 7671 Section 701
3 m
minimum distance from zone 1 for a standard socket outlet
BS 7671 Reg 701.512.3
30 mA
RCD protection required for all circuits serving the room
BS 7671 Reg 701.411.3.3
Regulation numbers refer to BS 7671:2018+A2:2022, the IET Wiring Regulations, Section 701 (locations containing a bath or shower). Part P references are to the Building Regulations for England. Sources are listed in full at the end.
How the bathroom zones work
BS 7671 divides a bathroom into zones based on how close you are to the water. The closer the zone, the stricter the rules on what electrical equipment can go there. A light switch is only a problem because of where it sits in relation to these zones.
| Zone | Where it is | Standard 230 V switch allowed? |
|---|---|---|
| Zone 0 | Inside the bath or shower tray itself | No |
| Zone 1 | Directly above the bath or shower tray, up to 2.25 m from the floor. For a shower without a tray, within 1.2 m of the shower head | No |
| Zone 2 | A further 0.6 m out from the edge of zone 1, up to 2.25 m high | No |
| Outside the zones | The rest of the room | Yes |
| Outside the room | On the landing or hallway wall next to the door | Yes |
There is no zone 3 any more. Older guides still mention it, but it was removed when the 17th Edition came out in 2008. Today, anything beyond zone 2 is simply "outside the zones", and the general rules of BS 7671 apply there.
Which switches are allowed, and where
Regulation 701.512.3 is the one that decides this. It keeps switches and other accessories out of zones 0, 1 and 2, with a few specific exceptions. The most useful exception for homeowners is the pull cord: the regulation does not apply to the insulating pull cord of a cord operated switch. That is why a ceiling switch with its cord hanging near the bath is acceptable, while a wall switch in the same position is not.
| Switch type | Zone 1 | Zone 2 | Outside zones |
|---|---|---|---|
| Standard 230 V wall switch | No | No | Yes |
| Ceiling pull cord switch (cord in the zone) | Cord only | Cord only | Yes |
| 12 V SELV switch, source outside the zones | Yes | Yes | Yes |
| Controls built into suitable fixed equipment, such as a fan with integral timer | If rated for the zone | If rated for the zone | Yes |
The switch body still matters. With a pull cord switch, only the cord is allowed in the zones. The switch itself should be on the ceiling above 2.25 m, which puts it outside zones 1 and 2. A pull cord switch mounted low on the wall beside the bath is not compliant just because it has a cord.
Do you need building control? The Part P angle
In England, electrical work in a bathroom is only notifiable when it happens inside the area the Building Regulations call a special location. The IET's Part P guidance defines that area.
A room containing a bath or shower, the space surrounding a bath tap or showerhead
IET, Part P frequently asked questions. The space runs to 2.25 m high and 0.6 m out from the bath or tray, or 1.2 m from a shower head with no tray. See the IET's Part P guidance for England and Wales.| What you are doing | Notifiable in England? |
|---|---|
| Replacing a light switch like for like, outside the zones | No |
| Moving or adding a switch outside the special location | No |
| Adding or altering anything inside the special location | Yes |
| Running a new circuit for the bathroom | Yes |
| Replacing the consumer unit to add RCD protection | Yes |
Not notifiable does not mean anything goes. Every job must still meet BS 7671 and be tested. Notifiable work is either done by an electrician registered with a competent person scheme, who self certifies it, or notified to local authority building control before work starts.
Bathroom switches we stock
The ceiling pull cord switches below are the standard way to control lights inside the zones. The triple pole versions isolate an extractor fan as well as switching it, which is useful where the fan has an overrun timer.
BG Electrical
801 6A 1 way pull cord ceiling switch
BG Electrical
802CH 6A 2 way pull cord ceiling switch, chrome
BG Electrical
804 10A triple pole fan isolator pull cord switch
BG Electrical
803 45A DP pull cord ceiling switch with neon
Click
PRC210 10AX 2 way pull switch
Click
PRW208 10A 3 pole pull cord fan isolation switch
Click
PRW211 50A DP pull cord switch with neon
BG Electrical
820 dual voltage shaver socket, white
Prices shown are correct at the time of writing and exclude VAT where applicable. Check the product page for current pricing, stock and full specification, including whether a shaver socket meets BS EN 61558-2-5.
Your options, compared
1
Switch outside the bathroom door
The simplest and most common answer. A standard switch on the landing wall avoids the zones entirely, and you can use the same switch range as the rest of the house.
2
Wall switch inside, outside the zones
Fine in a larger bathroom where there is a wall more than 0.6 m beyond the bath or shower tray, typically by the door. Measure from the edge of zone 1, not from the tap.
3
Ceiling pull cord switch
The standard solution in small bathrooms. The switch is on the ceiling, out of the zones, and only the insulated cord hangs down. Choose a 2 way version if you also want a switch outside the door.
4
12 V SELV controls
Allowed in zones 1 and 2 as long as the safety transformer sits outside zones 0, 1 and 2. Less common in homes, but useful for wet rooms and some smart lighting systems.
Showers and fans need their own switch
The lights are not the only thing in a bathroom that needs switching. An electric shower needs a double pole isolator, usually a 45 A or 50 A pull cord switch on the ceiling, so the shower can be fully isolated for maintenance. An extractor fan with an overrun timer needs a triple pole isolator, so the permanent live and the switched live can both be disconnected.
A typical compliant bathroom, switch by switch
- Lights: 6 A pull cord on the ceiling, or a standard switch outside the door.
- Electric shower: 45 A or 50 A double pole pull cord isolator with neon.
- Extractor fan: 10 A triple pole fan isolator, outside the zones.
- Shaver point: a shaver supply unit to BS EN 61558-2-5, not a standard socket.
- Protection: every circuit serving the room on a 30 mA RCD or RCBO.
Common mistakes
- A wall switch next to the basin, near the shower. If that spot is within 0.6 m of the shower tray, it is in zone 2, wherever the basin is.
- Pull cord switch mounted low on the wall. Only the cord is allowed in the zones. The switch belongs on the ceiling, above 2.25 m.
- Measuring from the wrong point. Zone 2 is measured from the edge of zone 1, which is the edge of the bath or tray, not the tap or the shower head.
- Forgetting the ceiling height. In a low ceiling bathroom, zones 1 and 2 can reach the ceiling. A ceiling switch below 2.25 m is inside the zone.
- Fitting a standard socket for a shaver. Only a shaver supply unit to BS EN 61558-2-5 is allowed near the bath. Normal sockets must be at least 3 m from zone 1.
- No RCD on the lighting circuit. Section 701 requires 30 mA RCD protection for all circuits serving the room, including the lights.
Choosing parts for a bathroom? See our BG ceiling switches and Click pull cord switches, and our guide to bathroom lighting zones and IP ratings. For sockets, read can you have a socket in a bathroom. We supply trade, councils, end users and government bodies.
Frequently asked questions
Can you have a normal light switch in a bathroom in the UK?
Yes, as long as it is outside zones 0, 1 and 2. That means at least 0.6 m horizontally beyond the edge of the bath or shower tray, or beyond 1.2 m from the shower head where there is no tray. If there is no suitable wall, use a ceiling pull cord switch or put the switch outside the bathroom door.
Why do UK bathrooms use pull cord switches?
Because BS 7671 keeps standard switches out of zones 0, 1 and 2, but makes an exception for the insulating cord of a cord operated switch. The switch is mounted on the ceiling, outside the zones, and the cord can hang near the bath or shower. It is the simplest way to put a switch within reach in a small bathroom.
How far from a shower does a light switch need to be?
Outside zone 2. For a shower with a tray, zone 2 ends 0.6 m beyond the edge of the tray. For a shower with no tray, zone 1 extends 1.2 m from the shower head and zone 2 extends a further 0.6 m. Measure horizontally, and remember the zones run up to 2.25 m from the floor.
Can I have a light switch inside the bathroom door?
Usually yes. In most bathrooms the wall by the door is outside the zones. Check the distance from the bath or shower tray edge first. If it is more than 0.6 m beyond zone 1, a standard switch is allowed there.
Is a smart switch allowed in a bathroom?
The same zone rules apply. A 230 V smart switch must be outside the zones. A smart control inside the zones is only acceptable if it is a SELV device with its power source outside zones 0, 1 and 2, or a control built into equipment rated for that zone.
Do I need an electrician to change a bathroom light switch?
In England, replacing a switch like for like outside the special location is not notifiable, so the law does not require a registered electrician. The work must still meet BS 7671. Any addition or alteration inside the special location is notifiable, so it needs a scheme registered electrician or a building control application.
Does a bathroom lighting circuit need an RCD?
Yes. Regulation 701.411.3.3 requires 30 mA RCD protection for all circuits serving a room containing a bath or shower, and that includes lighting. If the lighting circuit is not RCD protected, an electrician will usually recommend an RCBO or a consumer unit upgrade.
Sources & references
- IET, Part P of the Building Regulations for England and Wales, frequently asked questions, electrical.theiet.org. Definition of a special location in a room containing a bath or shower, with its 2.25 m, 0.6 m and 1.2 m limits, and the notifiable work list.
- BS 7671:2018+A2:2022, Requirements for Electrical Installations, IET Wiring Regulations, Section 701. Zone definitions, Regulation 701.411.3.3 on 30 mA RCD protection, and Regulation 701.512.3 on switchgear, accessories, pull cords, SELV switches and socket outlets.
- Approved Document P, Building Regulations for England, 2013 edition. Notifiable work limited to new circuits, consumer unit replacement, and additions or alterations in special locations.
- BS EN 61558-2-5, Safety of transformers, particular requirements for shaver supply units.
Disclaimer: This article provides general information and is not a substitute for design or installation advice. Requirements depend on the specific installation, its measured characteristics and the applicable regulations in your part of the UK. Always consult a competent person and refer to the current edition of BS 7671.
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