Building regulations advice
Building regulations are national standards which apply to all types of building or alterations and cover all aspects of construction.
Part P of the building regulations deals with electrical work.
Any electrical work carried out by non-registered traders should be checked and certified and the property owner is responsible for ensuring electrical work complies with the rules.
Find a registered electrician
View building regulation electrical advice and guidance
Sewer pipes and drains
If you plan to build over or close to a sewer you must notify Welsh Water, read Welsh Water's build over sewer process
Building regulations approval
Building regulation submission is needed for work including:
home extensions, e.g. a kitchen, bedroom, lounge
internal structural alterations, such as the removal of a load-bearing wall or partition, installation of baths and showers, WCs which involve new drainage or waste plumbing
installation of new heating appliances, new chimneys or flues
underpinning of foundations
altered openings for new windows in roofs or walls
replacing roof coverings (more than 25%)
installation of cavity insulation
erection of new buildings that are not exempt
access improvements for disabled people
Visit Planning Portal Building Regulations for more information.
Some building work is exempt from building regulations including conservatories, porches, covered ways and carports (open on at least 2 sides), detached single storey garages, small detached single storey buildings which are less than 30m2 and contain no sleeping accommodation and detached buildings with a floor area of no more than 15m2 which do not contain sleeping accommodation, e.g. a garden shed.