How Much Should You Budget for a Small, Medium or Large Bathroom in 2026?

Written by the team at The Bathroom Project — hands-on bathroom, plumbing and heating specialists serving Bromley, Orpington and across Kent.

If you’re planning a new bathroom, one of the easiest ways to start building a realistic budget is to consider the size of the room.

But there is an important point that’s often missed:

Bathroom size affects the price, but it isn’t the only — or necessarily the biggest — factor.

A small bathroom with premium products, extensive tiling and a redesigned layout can cost more than a larger bathroom with a straightforward specification.

For homeowners in Bromley, Sevenoaks, West Malling and the surrounding areas, we recommend thinking about your bathroom budget in terms of room size + specification + complexity.

Quick answer: what should you budget?

As a realistic planning guide for a professionally managed bathroom renovation:

Bathroom

Typical planning budget

Small bathroom

£8,000–£12,000

Medium bathroom

£10,000–£16,000

Large bathroom

£15,000–£20,000+

Complex / premium bathroom

£18,000–£25,000+

These are indicative planning ranges, not fixed quotations.

The final cost depends on the existing bathroom, the layout, products, materials, preparation and complexity of the installation.

The important question isn’t simply:

“How big is my bathroom?”

It’s:

“What level of bathroom am I trying to create?”

Small bathroom renovation cost

Typical planning budget: £8,000–£12,000

A small bathroom might be a compact family bathroom, en-suite or bathroom with limited floor space.

You might assume that a small room should automatically mean a cheap renovation.

That’s not necessarily the case.

You still need many of the same processes and trades:

• Strip-out

• Plumbing

• Electrical work

• Waterproofing

• Tiling

• Flooring

• Sanitaryware

• Shower installation

• Ventilation

• Lighting

• Finishing and making good

In fact, working in a small bathroom can sometimes be more challenging because there is less room for tradespeople to work and fewer opportunities to conceal services.

What might £8,000–£12,000 achieve?

Depending on the specification, this could potentially allow for:

• New toilet

• New basin and furniture

• New shower

• Shower enclosure or screen

• New flooring

• Wall tiling

• New lighting

• Extractor fan

• Heated towel rail

• Plumbing improvements

• Quality mid-range products

• Professional installation

Premium brassware, bespoke furniture, extensive porcelain tiling or significant layout changes could push the project beyond this range.

Medium bathroom renovation cost

Typical planning budget: £10,000–£16,000

For many homeowners, this will be the typical family bathroom.

There is usually enough space for a bath or larger shower, basin furniture, toilet and additional storage.

A medium-sized bathroom also gives you more opportunity to improve the layout.

For example, you might change:

Bath + shower over bath

into:

Separate walk-in shower + freestanding bath

That can change not only the appearance of the room but also the plumbing, waterproofing, glass and installation requirements.

What might £10,000–£16,000 achieve?

Depending on specification, you could potentially include:

• Quality sanitaryware

• Vanity furniture

• Separate shower

• Bath

• Shower screen

• Quality brassware

• Full or extensive tiling

• Improved lighting

• Heated towel rail

• Underfloor heating

• Better ventilation

• New plumbing

• Professional preparation

• Complete installation

This is often where product selection starts to have a significant effect on the final price.

Large bathroom renovation cost

Typical planning budget: £15,000–£20,000+

A larger bathroom gives you more possibilities, but it also creates more surfaces, more materials and potentially more installation time.

A larger bathroom might include:

• Freestanding bath

• Large walk-in shower

• Double vanity

• Separate toilet

• Extensive storage

• Feature walls

• Large-format porcelain

• Underfloor heating

• Premium brassware

• Bespoke glass

• Statement lighting

If you’re creating a genuinely high-end bathroom, £20,000+ is entirely possible.

At this level, the design and specification become particularly important.

Complex bathrooms: when size stops being the main issue

Some bathrooms simply shouldn’t be priced by size.

For example, a small wet room could require:

• Full waterproofing

• Specialist drainage

• Correct floor falls

• Specialist preparation

• Bespoke glass

• Extensive tiling

Meanwhile, a large bathroom with the existing layout might actually be relatively straightforward.

This is why we don’t recommend using a simple “£X per square metre” formula to price a bathroom.

The room’s complexity and specification are often more important than its physical size.

What makes a bathroom more expensive?

There are several decisions that can significantly affect your budget.

1. Changing the layout

Keeping your toilet, basin and shower in their existing positions can reduce plumbing and drainage work.

Moving them can introduce additional:

• Pipework

• Waste connections

• Floor preparation

• Boxing-in

• Making good

• Installation time

If you’re considering changing the layout, it’s worth understanding the additional cost before committing to the design.

However, changing the layout can sometimes be one of the best investments you make.

A better layout can improve:

• Storage

• Shower space

• Accessibility

• Flow around the room

• Appearance

• Everyday usability

2. The quality of your products

There’s a huge difference between:

Budget

Mid-range

Premium

Luxury

sanitaryware and brassware.

You don’t necessarily need the most expensive products.

The goal should be to choose products that provide the right combination of appearance, performance, durability and value.

3. Tiling

Tiles can have a surprisingly large impact on your final budget.

Consider:

• Tile size

• Tile material

• Full-height vs part tiling

• Feature walls

• Pattern

• Herringbone layouts

• Natural stone

• Large-format porcelain

• Mitred edges

A bathroom with straightforward ceramic tiles can be very different in cost from one covered in large-format premium porcelain.

4. Walk-in showers and wet rooms

A walk-in shower can completely change the appearance of a bathroom.

But it needs to be designed and installed correctly.

A true wet-room style installation can involve:

• Waterproofing

• Specialist drainage

• Correct floor falls

• Appropriate substrates

• Glass

• Detailed finishing

That’s why a wet room shouldn’t simply be treated as a standard shower installation.

5. Bathroom furniture

Storage is one of the most important parts of a successful bathroom.

You might choose:

Standard off-the-shelf furniture

or

Premium or bespoke furniture

The difference in price can be considerable.

But good storage can also make a relatively small bathroom feel much more organised.

6. Heating and lighting

These are easy to overlook when setting your initial budget.

A renovation might include:

• Heated towel rail

• Underfloor heating

• LED lighting

• Mirror lighting

• Feature lighting

• Improved extractor ventilation

These aren’t simply decorative extras.

Good lighting and heating can make a bathroom substantially more comfortable to use.

Where should you spend your money?

If your budget isn’t unlimited, don’t automatically spend the most money on the things that look impressive in a showroom.

We’d prioritise:

1. Preparation

Get the room right underneath the finishes.

2. Plumbing

Make sure the infrastructure is properly planned.

3. Waterproofing

Particularly around showers and wet-room areas.

4. Installation

Good products won’t rescue poor installation.

5. Products you interact with every day

Your shower, taps, toilet, basin and storage are worth considering carefully.

6. Design

A good layout can make a £12,000 bathroom feel considerably more impressive than a badly planned £20,000 bathroom.

Why can two bathrooms of the same size cost £5,000 apart?

Imagine two identical 6m² bathrooms.

Bathroom A

• Existing layout retained

• Standard sanitaryware

• Ceramic tiles

• Standard shower

• Standard furniture

• Straightforward installation

Bathroom B

• Toilet relocated

• Walk-in shower

• Premium brassware

• Large-format porcelain

• Bespoke vanity

• Underfloor heating

• Feature lighting

• Custom glass

They’re the same size.

They’re not the same project.

That’s why we believe bathroom renovation pricing should be based on the whole project, rather than simply the number of square metres.

What should your bathroom budget include?

When comparing quotations, check whether your price includes:

• Design and planning

• Strip-out

• Waste removal

• Plumbing

• Electrical work

• Waterproofing

• Preparation

• Tiling

• Flooring

• Sanitaryware

• Furniture

• Brassware

• Shower

• Glass

• Lighting

• Ventilation

• Heating

• Installation

• Final finishing

A cheap quotation isn’t necessarily cheaper if important elements have simply been left out.

What if my budget is £10,000?

You can still create a very good bathroom.

The key is specification control.

Rather than trying to include everything, prioritise the areas that matter most.

For example:

Keep the existing layout, choose quality mid-range sanitaryware, use carefully selected tiles and invest in the shower and furniture.

That can potentially create a much better result than spending heavily on one or two luxury products while compromising elsewhere.

What if my budget is £15,000?

This starts to give you considerably more flexibility.

You may be able to consider:

• Better sanitaryware

• Premium brassware

• Walk-in shower

• Feature tiling

• Better furniture

• Underfloor heating

• Improved lighting

• More extensive layout changes

The exact balance depends on the room and your priorities.

What if my budget is £20,000+?

At this level, you’re moving towards a premium bathroom project.

The emphasis can shift from simply replacing the bathroom to creating something genuinely individual.

You might consider:

• Premium sanitaryware

• Designer brassware

• Bespoke furniture

• Large-format porcelain

• Natural stone

• Walk-in wet-room construction

• Underfloor heating

• Premium glass

• Statement lighting

• Complex layouts

• Higher-end finishing

At this point, the design and specification process becomes particularly important.

The Bathroom Project’s approach

At The Bathroom Project, we don’t believe that bigger automatically means better.

We believe the best bathroom is one where the budget has been spent intelligently.

That means understanding:

How you use the room

What you want it to look like

What your property needs

What your budget is

What will make the biggest difference

We can then help develop the bathroom around those priorities.

We work with homeowners across Bromley, Sevenoaks, West Malling and surrounding areas.

Bathroom renovation costs: quick guide

Project

Planning budget

Small bathroom

£8k–£12k

Medium family bathroom

£10k–£16k

Large bathroom

£15k–£20k+

Premium / complex bathroom

£18k–£25k+

These figures are intended as planning guidance for professionally managed renovation projects, rather than fixed prices.

Actual project costs depend on the existing bathroom, specification, access, layout, materials and installation requirements.

Frequently asked questions

How much does a small bathroom renovation cost?

A professionally managed small bathroom renovation might typically fall around £8,000–£12,000, depending on specification, layout, tiling and the condition of the existing room.

How much does a medium bathroom cost?

A medium family bathroom might typically require a budget of around £10,000–£16,000, although premium specifications and layout changes can increase this.

How much does a large bathroom renovation cost?

A larger bathroom can start around £15,000 and exceed £20,000, particularly where premium products, extensive tiling or complex installation is involved.

Is a small bathroom cheaper than a large bathroom?

Usually, but not always. The specification and complexity of the project can be more important than the physical size of the room.

Does moving the toilet increase the cost?

Usually. Moving plumbing and drainage can require additional pipework, floor preparation and installation time.

Is £10,000 enough for a bathroom?

It can be, depending on the size, layout and specification. A straightforward renovation with carefully selected products can potentially be achieved around this level.

Is £20,000 a lot for a bathroom?

It is a substantial bathroom budget, but premium or complex projects can exceed £20,000. The important question is what is included and what level of specification you’re getting.

How can I get an accurate bathroom renovation price?

The most reliable way is to have the existing bathroom assessed and discuss your preferred layout, products, finishes and budget before a quotation is prepared.

Planning a new bathroom?

If you’re considering a bathroom renovation in Bromley, Sevenoaks, West Malling or the surrounding areas, The Bathroom Project can help you plan the project from the outset.

Talk to us about your bathroom project and arrange a consultation.

Prices in this article are indicative 2026 planning ranges and are not quotations. Actual project costs depend on the existing bathroom, specification, access, layout, materials and installation requirements.