Does my job need building regulations approval?

People reach for the wrong test here. The question is not whether a job is big, expensive, visible or done by a professional — it is whether the work falls into one of a defined set of categories. Replacing a boiler is a small job that is fully notifiable; refitting an entire kitchen with no change to services or structure may not be. Categories, not size.

Safety

Step by step

1. Ask whether it is new building work.Extensions, loft conversions, garage conversions, new outbuildings above the exemption size, and anything that creates new floor area or a new storey. Almost always notifiable.
2. Ask whether it alters the structure.Removing or opening up a load-bearing wall, forming a new opening in an external wall, altering the roof structure, underpinning, or new and altered foundations. Notifiable, and needing a structural engineer's design.
3. Ask whether it touches controlled services and fittings.Replacing a boiler or altering heating and hot water, new electrical circuits and consumer units, replacement windows and external doors, new or altered drainage and soil pipes, and new bathrooms where drainage or ventilation changes.
4. Ask whether it changes the use of a space.A garage or outbuilding becoming habitable, a house becoming flats, or a loft becoming a bedroom. Change of use brings in insulation, fire, ventilation and sometimes sound requirements that did not previously apply.
5. Check the exempt list carefully rather than optimistically.Small detached outbuildings within the exemption criteria, some porches and conservatories meeting specific conditions, and like-for-like repair. Every one of these has conditions attached, and electrical work inside them is usually notifiable regardless.
6. Check which nation's rules apply.England and Wales now have separate regulations; Scotland runs a building standards system requiring a building warrant granted before work starts; Northern Ireland has its own regulations and building control. The categories are similar; the procedure is not.
7. Ring building control and describe the job.They answer this question every day and the call is free. Describe what you are doing rather than asking whether you need approval, and ask for the answer by email.
8. Decide who is applying before the builder starts.Get it in writing in the contract: who submits the application, who pays the fee, who calls the inspections, and who receives the completion certificate. Assuming the builder is doing it is how certificates go missing.

Tips

• A job can be exempt from building regulations and still be notifiable electrical work. The two questions are separate.
• Some work is covered by a competent person scheme instead of an application — the registered trade certifies its own work and the certificate comes from the scheme. Confirm which route applies before the work, not after.
• If a builder tells you a notifiable job does not need building control, that is a significant signal about the rest of their work.

Common mistakes

• Judging by the size of the job — A boiler swap is small and fully notifiable. A cosmetic refit of a whole house may not be. Category decides, not scale.
• Leaving the application to the builder without confirming — If nobody applies, there is no inspection and no completion certificate, and the discovery usually happens years later during a sale.

Questions people ask