What is Part P, and when is electrical work notifiable?
In England, Part P of the Building Regulations covers electrical safety in homes. It says electrical work must be designed, installed, inspected and tested so that it is safe, and the national standard for that is BS 7671, often called the Wiring Regulations. Every job has to meet it, from a new light to a full rewire. Wales, Scotland and Northern Ireland have their own rules.
Some work is also notifiable. Installing a new circuit or replacing a consumer unit are the usual examples. Notifiable work must either be carried out under a competent person scheme, where the electrician notifies on your behalf, or be notified to your local authority's Building Control, who arrange inspection and testing. Smaller jobs, such as adding a socket to an existing circuit, are generally not notifiable but must still comply with BS 7671.
Bathrooms and kitchens: where the rules get stricter
Bathrooms are treated as special locations because water and electricity are a poor mix. BS 7671 divides the area around a bath or shower into zones, and each zone restricts what can be fitted and how well it must be protected against water. That affects light fittings, extractor fans, electric towel rails, shaver sockets and mirrors. Ordinary sockets are heavily restricted in bathrooms, and RCD protection is generally required.
Kitchens have their own demands. Ovens, electric hobs, dishwashers and washing machines need cables and protective devices sized for the load, with isolation you can reach. If you are adding appliances or changing the layout, the existing circuits may not be adequate, which can mean a new circuit and so notifiable work. It is better to plan lighting and appliance positions before the units go in.
Water regulations and your plumbing
The Water Supply (Water Fittings) Regulations 1999 apply to plumbing in homes in England. In short, fittings must not waste, misuse, contaminate or unduly consume water, and they must be suitable for the job. That touches on backflow protection for things like outside taps and hose connections, the taps and valves used, and how new pipework is laid out and supported.
Some installations must be notified to your water supplier before work starts. We are not going to list them here, because the detail varies and can change. Check with your supplier before you begin, or ask us what applies to your job. Moving or adding drainage may also fall under Building Regulations, so mention it early rather than after the new pipework has been boxed in.
Ventilation in kitchens and bathrooms
Approved Document F covers ventilation. In general, kitchens and bathrooms need a way of removing moisture at source, usually an extractor fan, sometimes alongside an opening window. If you are altering or creating a kitchen or bathroom, those requirements may apply to the new work, so it is worth asking before the room is designed, not after the ceiling is closed up.
How a fan is installed matters as much as the fan. Ducting should run to the outside, never into a loft or ceiling void, with as few bends as possible and a slight fall towards the outlet so condensation does not run back. A bathroom fan must be suitable for its zone, and a run-on timer or humidity sensor lets it work for as long as the room needs. A recirculating cooker hood removes grease and smell but not moisture.
Why certificates matter when you sell
When you sell, the buyer's solicitor will typically ask what building work has been done, whether it complied with Building Regulations, and for the paperwork to prove it, including for electrical work. Missing certificates can mean delays, a request for an inspection after the event, or an indemnity policy to cover the gap. Lenders and insurers may ask questions too.
The paperwork is usually a Building Regulations compliance certificate, which comes through your local authority or a competent person scheme, and an electrical installation certificate or minor works certificate from whoever did the work. Keep them together with receipts and photos taken before anything was covered up. A folder in a drawer is fine. It is hard to chase these up once the person who did the work has moved on.
What to ask any tradesperson before work starts
Put these questions to anyone you are thinking of hiring, including us. A straight answer is a good sign. A vague one is worth noticing. Be wary of anyone who says certificates are not needed or offers to skip notification to keep things simple. As the owner you are the one holding the paperwork, and compliance is ultimately your responsibility.
- Is any of this work notifiable, and who will notify it?
- Will it be done under a competent person scheme or through Building Control?
- What paperwork will I receive, and when?
- Will the work be tested, and can I see the results?
- Does my plan involve a water supplier or ventilation requirement?
- Is my existing wiring or plumbing likely to need attention first?
Next steps
If you are planning a kitchen, bathroom or wider renovation, tell us early what you want to move or add, because that is what decides what has to be notified. Send photos of the room, your consumer unit and where the pipes run, plus rough measurements, on WhatsApp. We will confirm what applies to your job when we quote, and the quote is free with no obligation.
Quick answers
Do I need Building Control for a new socket or light fitting?
Often not. Adding a socket or light to an existing circuit is generally not notifiable, though it must still meet BS 7671. A new circuit or a consumer unit replacement usually is notifiable. The rules can change, so check current guidance or ask us what applies to your job.
Do I need to tell my water supplier about a new bathroom?
Sometimes. Some installations must be notified to the water supplier before work starts under the Water Supply (Water Fittings) Regulations 1999, and others do not. Check with your supplier before the work begins. They can tell you what applies to your plans, and it is much easier to ask before pipework goes in.
What paperwork should I receive after electrical work?
For notifiable work, expect a Building Regulations compliance certificate through Building Control or a competent person scheme, plus an electrical installation certificate. Smaller jobs typically get a minor works certificate. Ask what you will receive before work starts, and keep everything together for when you sell the house.