Is it safe to have my consumer unit in a kitchen cupboard under the sink?
Quick answer
No, it is generally not safe to install a consumer unit under a kitchen sink. This location exposes the unit to moisture, condensation, and the risk of water ingress from leaking pipes, all of which create serious electrocution and fire hazards. BS 7671 requires electrical equipment to be suitable for its environment. If your consumer unit is already located there, you should have a registered electrician inspect it as soon as possible and arrange for it to be relocated to a safe, dry, accessible position.
🏠Homeowner view
Finding your consumer unit tucked away under the kitchen sink might seem like a tidy solution, but it is one of the most hazardous places it could be installed. Here is what you need to know as a homeowner.
Why it is dangerous
The area under a kitchen sink is one of the dampest spots in a home. Even without a visible leak, condensation from pipes, steam from the sink, and humidity from everyday cooking and washing up can affect electrical equipment over time. A consumer unit in this location faces a real and ongoing risk of moisture getting inside, which can cause short circuits, corrosion of internal components, and in the worst cases, fire or electrocution.
Water and electricity are an extremely dangerous combination. If a pipe under your sink ever develops even a small drip and water reaches your consumer unit, you could be looking at a life-threatening situation.
What the rules say
Electrical installations in UK homes must comply with BS 7671, the national wiring standard. This requires that electrical equipment is only installed in locations appropriate to its environment. A damp or wet area like under a sink does not meet this requirement unless the equipment is specially rated for that environment, which a standard domestic consumer unit is not.
What you should do
Do not attempt to move the consumer unit yourself. This is not a DIY job. Consumer units are the heart of your home electrical system and working on them without the correct qualifications and tools is illegal and dangerous.
What you can safely do right now is check visually whether there are any obvious signs of moisture, rust, or discolouration around the unit, and check under the sink for any drips or leaks from pipework.
If you see any of these warning signs, stop using the cupboard as normal storage and keep it dry and clear until an electrician can attend.
Who to call
Contact a Part P registered electrician, ideally one registered with NICEIC, NAPIT, or ELECSA. They can carry out a full inspection and advise on the safest location to relocate your consumer unit. Relocation work will need to be notified to your local building control authority, which a registered electrician can handle on your behalf.
Do not delay. If you suspect any moisture has already reached the unit, treat this as an urgent matter.