Do you need building regulations approval for a new bathroom?
Planning permission and building regulations are different things — and a new bathroom almost always involves the second.
Replacing a bathroom like for like rarely needs approval. Creating a new bathroom, moving drainage or adding electrical circuits usually does.
Key takeaways
A like-for-like bathroom refit normally does not need building regulations approval.
Creating a new bathroom or en-suite, new drainage or new electrical circuits brings building regulations into play.
The relevant Approved Documents include Part P (electrics), Part F (ventilation), Part G (sanitation and water efficiency) and Part H (drainage).
Planning permission is not usually needed for internal work, but listed buildings and some flats have extra rules.
Using registered competent-person installers lets parts of the work be self-certified.
When it applies
When a bathroom needs approval
Building regulations set minimum standards for safety, health and energy. For bathrooms in England, the Planning Portal and local building control teams generally treat a new or additional bathroom, en-suite or cloakroom as building work that needs approval, because it affects drainage, ventilation and electrics.
| Work | Building regs approval? |
|---|---|
| Like-for-like replacement of fittings | Usually not |
| New bathroom or en-suite in a new location | Yes |
| New drainage or moving the soil stack connection | Yes |
| New electrical circuit, or work in the bathroom zones | Yes — notifiable under Part P |
| New or altered mechanical extraction | Usually yes (Part F) |
| Structural changes to walls or joists | Yes |
The Approved Documents
Which parts of the regulations are involved
Part P — Electrical safety
Most electrical work in a bathroom is notifiable and should be done by a registered electrician who can self-certify, with RCD protection on bathroom circuits.
Part F — Ventilation
Bathrooms need adequate extraction, typically a fan with a minimum extract rate, to control moisture and condensation.
Part G — Sanitation and hot water
Covers sanitary provision, hot water safety and water efficiency, including safe hot water temperatures at baths.
Part H — Drainage
New waste and soil pipes need the right falls, sizes and access for maintenance.
Parts A, B and M
Structure, fire safety and access can apply where walls, floors or layouts change.
For the electrical side in more detail, read bathroom electrical zones and IP ratings explained.
Planning
Do you need planning permission?
Planning permission is normally not needed for a new bathroom or en-suite inside the existing building. It may be needed if the work is part of an extension or loft conversion, changes the outside of the house (for example a new soil pipe on a front elevation), or if the property is listed or in a conservation area with specific restrictions.
Listed buildings need listed building consent for many internal alterations, including some bathroom work. Always check before starting.
Flats
Flats and leasehold properties
In a leasehold flat, building regulations sit alongside the lease. Moving a bathroom or changing drainage usually needs the freeholder's written consent as well — see renovating a bathroom in a leasehold flat.
In practice
How approval is handled on a project
Check the scope
We establish at survey stage whether the work is notifiable.
Use competent persons
Registered electricians and installers self-certify the parts of the work they are registered for.
Building control where needed
For new bathrooms, drainage or structural changes, a building control application is made before work begins.
Keep the certificates
You receive the completion certificates — useful when you sell the property.
This is part of the planning stage of our en-suite and full renovation projects.
FAQ
Frequently asked questions
Usually not, if fittings are replaced in the same positions without new circuits or drainage. Electrical work in the bathroom may still be notifiable.
Normally not, if it is inside the existing house and not part of an extension, and the property is not listed.
A registered electrician can self-certify notifiable work and notify building control on your behalf.
It can cause problems when selling. A regularisation application to building control may be possible, but it is better to get approval at the start.
Sources
Sources and further reading
Related services: en-suite bathrooms, full bathroom renovation. Related projects: Compact and Calm, A Small Room in Marble, The Long Niche.
