Bathroom electrics: zones, rules and pricing
Bathroom electrical zones explained, what's allowed where, and what a compliant bathroom install involves for South Wales homes.
Bathrooms have specific rules because water and electricity share the room. Zones dictate which fittings can go where and what IP rating they need, and everything needs RCD protection. None of it is complicated once designed in — all of it is expensive to retrofit after tiling.
Most bathroom work is notifiable, which means the certification and notification should be in the quote you accept.
- Zone-appropriate IP-rated fittings and accessories
- RCD protection for all bathroom circuits
- Supplementary bonding where required by the installation
- Notifiable work certified and notified as part of the job
What the zones mean in practice
The inside of a bath or shower and the space immediately around it have the strictest requirements; the rest of the room relaxes as you move away. In practical terms it decides which downlights can go over the shower, where a shaver socket can sit, and where an extractor fan can be mounted.
Common retrofit problems
Lights fitted over a shower without the right rating, fans wired without local isolation, and no RCD protection on the circuit are the three findings we see repeatedly in condition reports on refurbished bathrooms.
Cost drivers
Electric shower supply, whether the board can take new circuits, extraction ducting route, and how much of the ceiling is accessible. A bathroom with a loft above is materially cheaper than a ground-floor bathroom under a bedroom.
Common questions
Can I have a normal socket in a bathroom?
Only shaver sockets to the relevant standard, and only outside the specified zones.
Is bathroom work notifiable?
New circuits and most work in a room containing a bath or shower are notifiable. We certify and notify.
Do I still need supplementary bonding?
It can be omitted where specific conditions are met. We verify those rather than assuming.
Get a fixed price
Bathroom being refitted? Get us in at first fix with the fitter's plan — zone compliance costs nothing to design and plenty to correct.