Guide to bathroom building regulations UK

The bathroom is one of the most used rooms in the home so it needs to be functional, warm and easy to clean as well as attractive. Before you begin to plan a newbathroom building regulations bathroom refurbishment though, you need to make sure your plans meet current UK building regulations which are designed to ensure the health, safety and comfort of all homes.

Related Bathroom Building Regulations

Here’s a guide to the relevant building regulations for bathroom refurbishment:

Part H – Drainage and waste disposal regulations

Building regulations part H refers to the drainage and waste disposal guidelines which must be met in the UK. It states that adequate drainage systems must be provided as well as highlighting the importance of pollution prevention, working sewage infrastructure and sewerage maintenance. Part H building regulations also cover some important technical design standards, such as rainwater drainage, cesspools and internal sanitary pipework.

It’s essential that your bathroom plumbing is installed correctly for safety and hygiene reasons, so hire a qualified plumber for this work. They will adhere to building regulations, which include making sure waste pipes and drainage run downhill from the appliance to the outlet. The Water Regulations Advisory Scheme also applies to bathroom plumbing; the regulations were devised to prevent water wastage, misuse and contamination.

Part F – Ventilation

Ventilation is especially important in moist areas like kitchens and bathrooms to prevent damp and mould, which can be harmful to properties as well as health. Building regulations state that bathrooms must be ventilated via a window or extractor fan – you may want to use both.

  • A new bathroom should have a fan which extracts at a rate of at least 15 litres per minute and continues to run for 15 minutes after the light has been switched off.
  • Door undercuts have to be 10mm above the floor finish where floor finish is fitted, or 20mm undercut above any other surface where the finish has not been fitted.
  • Windows with less than 15 degrees of opening are not suitable for certain types of ventilation.

Part P – Electrical safety laws

Water and faulty electrics can be a lethal combination, which is why it’s illegal to carry out electrical work in the bathroom unless you are a qualified electrician registered with an approved scheme like the Electrical Contractors’ Association (ECA) or the National Inspection Council for Electrical Installation Contracting (NICEIC). Part P ensures that all household electrics are installed safely; rules for bathroom electrics for example building regulations for bathroomspecify the maximum voltage levels for different areas in the bathroom and state that light switches should be pull chord operated or located outside the bathroom.

Part A – Structural safety regulations

It’s necessary to look at the structural safety of your bathroom, especially if you are extensively refurbishing or building a new room from scratch. You would need to make sure, for instance, that the floor is structurally secure enough to hold your bathroom suite and a full bathtub.

Do I comply with the latest building regulations for bathroom?

If you are unsure about whether your new structure complies with the bathroom building regulations, always seek advice from a professional bathroom installation company. Make sure that you ask for references and insurance credentials from all contractors before you hire and get at least three quotes for the work. If you want more inspiration on bathroom design, take a look at our expert tips here.

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