Do You Need Building Regulations Approval for a Bathroom Renovation?

For most bathroom projects the answer splits in two: you almost certainly do not need planning permission, and you quite possibly do need to satisfy the Building Regulations. People tend to worry about the first and overlook the second, when it is the second that actually applies to nearly every bathroom job.

Planning permission is rarely the issue

Reworking a bathroom inside an existing house is internal work, and internal work does not normally need planning permission. The exceptions are worth knowing:

• Listed buildings. Listed building consent can be required for internal alterations, and the threshold is lower than people expect.
• Flats and maisonettes. Planning rules may not bite, but your lease almost certainly does. Freeholder consent is commonly needed for anything touching drainage or structure.
• Anything that changes the outside. A new soil vent pipe, an extract terminal or a new window on a front elevation can need permission, particularly in a conservation area.

If none of those apply, planning permission is unlikely to come into it.

Building Regulations usually do apply

This is the part that catches people out. The Building Regulations are about how the work is done rather than whether you are allowed to do it, and several parts of them are engaged by an ordinary bathroom refit:

• Electrical work. Bathrooms are treated as special locations because of the obvious water risk. New circuits, and certain work within the zones around a bath or shower, are notifiable.
• Ventilation. A bathroom needs adequate mechanical extract. If there is no fan, or you are creating a room that did not have one, this applies.
• Drainage. Moving a WC, adding a second waste, or altering the soil stack brings drainage requirements into play.
• Structure. Taking out or opening up a wall to change the layout is structural work and needs signing off.
• Unvented hot water. Fitting a new unvented cylinder is separately notifiable in its own right.
• Fire safety. If the bathroom sits on an escape route, or forms part of a loft conversion, escape and fire separation requirements apply.

What counts as like-for-like

If you are replacing a suite in the same positions, using the existing waste and supply runs, with no new electrical circuits and a working extract already in place, you are generally not doing notifiable work. That is the genuinely simple case.

It is worth being honest with yourself about whether your project really is that, though. Moving the WC a metre, adding downlights, swapping a bath for a walk-in shower with a new drain position, or turning a bedroom into an en-suite all take you out of like-for-like and into notifiable territory.

Not needing to notify the work is not the same as the work not needing to comply. The standards apply either way.

How it gets signed off

There are two routes, and which one you use depends on the trade doing the work:

A competent person scheme. Registered installers can self-certify their own work and notify it themselves. An electrician registered under an approved scheme does this for the electrical work, and a registered installer does the same for an unvented cylinder. You receive a certificate afterwards, and no separate building control application is needed for that element.

Local authority building control. For structural work, or where nobody on the job can self-certify, you submit a building notice or full plans to your council, they inspect at the appropriate stages, and issue a completion certificate at the end.

Most bathroom projects end up using the first route for the electrics and never troubling building control at all. Structural changes are what usually trigger the second.

Keep the paperwork

Whichever route applies, keep what you are given. Certificates for electrical work and for an unvented cylinder are exactly what a buyer's solicitor asks for, and reconstructing them years later is slow and expensive. File them with your boiler paperwork and service records.

How we handle it

R.K Plumbing & Heating design and install complete bathrooms, and we manage the whole project rather than leaving you to coordinate trades. Part of that is telling you at survey stage which parts of your job are notifiable, so there are no surprises at the end. Electrical work is carried out by a suitably qualified electrician who self-certifies their own work, in the same way a builder brings one in.

We are based in Woodingdean and cover Brighton, Hove, Worthing, Lewes, Shoreham-by-Sea, Haywards Heath, Seaford, Burgess Hill and surrounding Sussex towns. If you are planning a bathroom renovation and want to know what applies to your project, call us on 01273 911551 and we will talk it through before anything is agreed.

None of the above is a substitute for checking with your own local authority building control, particularly for a listed building or a flat, where the rules are less forgiving.