Bathroom Renovation Guide: Planning, Cost and Layout

A bathroom renovation is one of the highest-value improvements you can make to a home, and one of the most disruptive if it is not planned properly. Get the layout, the order of work and the regulations right and you end up with a room that looks good and lasts; rush it and you inherit leaks, condensation and a suite that never quite fits. This bathroom renovation guide covers how to plan the job, what it costs in 2026, the sequence a good project follows and the building rules that apply in England.

Table of Contents

Planning your bathroom renovation

Start with how the room needs to work rather than which tiles you like. Ask who uses it, whether you need a bath as well as a shower, how much storage you want and where the natural light falls. A family bathroom, an en-suite and a downstairs cloakroom all pull in different directions.

Measure the space accurately and note the position of the soil pipe, water supplies and windows, because moving a toilet or a soil stack is far more expensive than moving a basin. Set a realistic budget with a contingency of around 10% to 15% for the surprises that older houses tend to hide behind the walls, such as rotten floorboards or tired pipework.

How much does a bathroom renovation cost in 2026?

Cost depends on the size of the room, the specification of the suite and tiling, and how much the layout changes. As broad 2026 guidance for England:

Cloakroom or small en-suite: roughly £3,000 to £5,000 for a straightforward refit.
Standard family bathroom: roughly £6,000 to £10,000 including a new suite, tiling and labour.
High-end or fully reconfigured bathroom: £12,000 and up, especially where walls move, underfloor heating goes in or premium materials are used.

Labour is typically the largest single cost, often a third to a half of the total, because a bathroom pulls together several trades. Moving plumbing, tanking for a wet room and bespoke tiling all push the figure up. Treat any quote that seems far cheaper than the rest with caution, and make sure it covers waste removal, making good and the extractor fan.

Getting the layout right

Good bathroom layout is about circulation and clearances as much as looks. Keep enough space in front of the toilet and basin to stand comfortably, and avoid a door that swings into a fitting. Where space is tight, a walk-in shower can free up floor area that a bath would swallow, while a wall-hung basin and toilet make a small room feel larger and easier to clean.

Think about services early. Keeping the toilet near the existing soil pipe saves money, and running the shower off the right supply avoids weak pressure later. Plan lighting and extraction at the design stage too, not as an afterthought once the tiles are on.

The order of work: what happens when

A well-run bathroom project follows a clear sequence, and understanding it helps you spot a contractor who is cutting corners.

Strip out: remove the old suite, tiles and any damaged plaster or flooring.
First fix: plumbers and electricians run the pipework and cabling in the walls and floor before anything is covered up.
Preparation: repair or replace the substrate, board the walls and, for showers and wet rooms, apply a waterproof tanking system.
Tiling: fix and grout wall and floor tiles once the background is sound and level.
Second fix: install the bath, shower, toilet, basin, taps and radiator or heated towel rail, and connect them.
Finishing: seal around the bath and shower with silicone, decorate, and carry out final electrical connection and testing.

A standard bathroom typically takes one and a half to three weeks from strip-out to finish, longer if the layout changes or the room needs structural work.

Building regulations and safety

Most cosmetic refits do not need planning permission, but several parts of the Building Regulations apply to the work inside the room. In England these include:

Part P (electrical safety): a bathroom is a special location because of the water, so electrical work must be safe and, where notifiable, either carried out by a registered competent-person electrician or signed off by building control.
Part G (sanitation and hot water): covers water supply, hot water safety and water efficiency.
Part F (ventilation): bathrooms need adequate extract ventilation, normally a fan, to remove moisture and prevent condensation and mould.
Part H (drainage): covers how waste connects to the drainage system.

You can read the common project guidance through the Planning Portal, the government-backed planning and building resource. Using trades who work to these standards protects both your home and its resale value.

Hiring the right trades

A bathroom needs a plumber, an electrician and usually a tiler, and the quality of the finish depends heavily on getting good ones. Ask to see recent work, check that the electrician is registered under a competent-person scheme, and get a written quote that itemises labour, materials, waste removal and making good. A clear payment schedule tied to stages of the job protects both sides. For larger reconfigurations, a single contractor who manages all the trades usually gives a smoother result than coordinating them yourself. You can see the kind of home improvement work we take on across Kent on the Contemporary Structures homepage.

Frequently asked questions

How long does a bathroom renovation take?

A standard family bathroom usually takes one and a half to three weeks from strip-out to finished, allowing time for tiling adhesive and grout to cure between stages. Projects that move walls, add underfloor heating or convert to a wet room take longer.

Do I need planning permission to renovate a bathroom?

Replacing a bathroom in the same footprint does not usually need planning permission. You are more likely to need it if you add a bathroom in an extension or convert a garage. The work still has to meet the relevant Building Regulations even when planning permission is not required.

Does a bathroom need an extractor fan?

In most cases yes. Part F of the Building Regulations requires adequate ventilation, and an extractor fan is the standard way to remove the moisture that causes condensation, damp and mould in a bathroom, particularly rooms without an opening window.

What is the most expensive part of a bathroom renovation?

Labour is usually the biggest cost, because a bathroom brings together plumbing, electrics and tiling. Moving the layout, especially relocating the toilet or soil pipe, and tanking a wet room add the most to a quote after the suite and tiles themselves.

Should I fit the bath or tile first?

It depends on the design, but a common approach is to fit the bath, then tile down to its edge so the tiles overlap and shed water into the bath, finishing with a silicone seal. Your tiler and plumber should agree the sequence before second fix so the junctions are watertight.

Can I use my bathroom during the renovation?

Usually not, which is why many households arrange access to another bathroom or plan around the disruption. A good contractor will tell you at which stages the water and toilet will be off so you can prepare.

Bathroom Renovation Guide: Planning, Cost and Layout

Planning your bathroom renovation

How much does a bathroom renovation cost in 2026?

Getting the layout right

The order of work: what happens when

Building regulations and safety

Hiring the right trades

Frequently asked questions

How long does a bathroom renovation take?

Do I need planning permission to renovate a bathroom?

Does a bathroom need an extractor fan?

What is the most expensive part of a bathroom renovation?

Should I fit the bath or tile first?

Can I use my bathroom during the renovation?

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