Bathroom mirror-cabinet wiring depends on the actual position of the cabinet. Check where it sits relative to the bath and shower, how power reaches it, whether the product is suitable for that position and whether the wall is ready before the final finish goes on.
Mirror cabinet wiring checker
Use this before buying a cabinet or closing a tiled wall. It does not replace an electrician’s survey.
Mirror cabinet wiring checks
| Check | What it means | Why it matters |
|---|---|---|
| Bathroom zone | Position relative to bath, shower and water spray. | Zones affect what equipment can be used and what IP rating is needed. |
| IP rating/product instructions | Manufacturer states where the cabinet can be installed. | A stylish cabinet is not automatically suitable for every bathroom position. |
| Cable entry | Power exits in the right place behind or near the cabinet. | A late cable route can damage tiles, make fixings awkward or leave visible trunking. |
| Isolation | Safe means to isolate the fixed wiring. | Maintenance and fault finding need a safe, planned isolation route. |
| RCD protection | Protection appropriate to the circuit and current rules. | Bathrooms are higher-risk locations, so protection must be checked by a competent person. |
| Mounting and use | Height, door swing, storage depth and mirror eye line. | Electrical planning should not create a cabinet that is awkward to use. |
Do not plan the cabinet after tiling
Mirror cabinets often combine storage, lighting, demister pads, shaver supply and sometimes sensors. That makes them more complicated than a mirror hung on two screws. The best time to decide the cabinet is before the wall finish is closed, while cable route, fixing grounds, tile layout and mirror height can still be adjusted.
Check bath/shower distance, splash risk, user eye line, basin tap reach and whether the cabinet door opens without hitting lights or walls.
Read the installation instructions and IP rating. A cabinet described as bathroom-style still has limits.
Plan cable exit, isolation and any shaver/demister feature before plasterboard, tile backer or wet-wall panels are fixed.
Mirror cabinets are heavier than mirrors. Make sure the wall build-up can take the fixing loads.
Normal sockets are not the shortcut
UK bathroom socket rules are strict because water and electricity are a poor mix. Electrical Safety First states that sockets are not allowed in bathrooms or shower rooms apart from shaver-supply units unless they can be fitted at least three metres from the bath or shower. That is why an illuminated cabinet should be planned as fixed bathroom electrical equipment rather than a plug-in workaround.
Mirror height and lighting quality
The electrical side is only half the decision. A cabinet can be safe but still badly placed. Set mirror height around real users, basin splash, task lighting, shaving or make-up use, cabinet depth and door swing. If the cabinet includes LED lighting, check colour temperature and whether the light actually lands on the face rather than the ceiling.
Good cabinet plan
- Bathroom zone and product IP checked before purchase.
- Cable exit lines up with cabinet instructions.
- Wall backing/fixings suitable for weight.
- Mirror height and lighting checked for users.
Weak cabinet plan
- Cabinet bought because it fits the basin width only.
- Cable route invented after tiling.
- Normal socket treated as an easy solution.
- Door swing clashes with light, wall or tall tap.
What to prepare for the electrician or bathroom fitter
- Choose the cabinet model or at least shortlist exact dimensions and instructions.
- Mark the basin centreline, finished floor level and preferred mirror eye line.
- Show the bath, shower, screen and wet-zone boundaries.
- Confirm whether the cabinet has light, demister, shaver supply, Bluetooth or sensor controls.
- Check wall construction, tile thickness and fixing points.
- Agree cable route and isolation before the wall is closed.
Where ABC Home fits
ABC Home can coordinate the practical bathroom side: cabinet position, tile layout, wall fixings, lighting, electrical route, fan location and making good. The neatest result happens when bathroom fitting and electrical planning are done together, before the finished wall says no.
Sources and practical checks
- Electrical Safety First bathroom safety: notes that sockets are not allowed in bathrooms or shower rooms apart from shaver-supply units unless at least three metres from the bath or shower.
- Scottish Government domestic technical handbook January 2025: Scottish domestic building standards context for building work and safety checks.
- IET Wiring Matters: bathrooms: technical background on electrical installations in locations containing a bath or shower.
FAQ
Can I wire a bathroom mirror cabinet myself?
Fixed bathroom wiring should be handled by a qualified electrician. The cabinet position, bathroom zone, IP rating, cable route, isolation, RCD protection and manufacturer instructions all matter.
Can a bathroom mirror cabinet plug into a normal socket?
Do not assume a normal socket is acceptable in a bathroom. Electrical Safety First notes that sockets are not allowed in bathrooms or shower rooms apart from shaver-supply units unless they can be fitted at least three metres from the bath or shower.
What should I check before buying an illuminated mirror cabinet?
Check the cabinet size, IP rating, bathroom zone suitability, cable entry point, wall fixings, mirror height, door swing, lighting colour and whether it needs demister, shaver supply or sensor controls.
