How to design a functional 4 m² bathroom – practical layouts with a shower, bath and washing machine

A small space doesn’t have to mean giving up comfort and style. A 4 m² bathroom can be surprisingly functional if you plan its layout and fittings well. How do you fit in everything you need – from a shower to a washing machine? Should you go for a bath, or is a modern walk-in shower the better choice?

In this article you’ll find concrete tips, tried-and-tested solutions and inspiration for a 4 m² bathroom to help you design an interior that’s practical, attractive and tailored to your needs.

Small 4 m² bathroom – functional, clever layouts?

Can you create a practical, comfortable space in 4 m²? Absolutely – provided you plan it well. Designing a small 4 m² bathroom calls for smart solutions and spot-on choices: from the type of brassware, through finishing materials, to storage.

Even a compact room can accommodate a bath, shower, toilet and basin – and still look modern rather than like a storeroom. The key is to match the fittings to the bathroom’s layout and choose a style that won’t overwhelm the space.

Designing a 4 m² bathroom with a shower – how to use the space optimally?

Planning to replace a bath with a shower? In a small bathroom it’s often the best choice. Here are proven ways to maximise the space:

1. Install a corner shower enclosure. By installing it in a corner, you’ll gain more space in the central part of the bathroom. Choose models with sliding doors that don’t need extra space to open.
2. Go for a walk-in shower. No shower tray and a clear glass panel visually enlarge the interior. A walk-in is also a convenient and elegant solution with no thresholds or awkward corners.
3. Choose a linear drain. It replaces a traditional shower tray and allows for a perfectly flush floor. It’s a modern, hygienic and very practical solution for everyday use.
4. Install a ceiling-mounted rain shower. It saves space and removes the need for exposed shower arms. It also gives a pleasant home-spa feel.
5. Integrate the shower area with the rest of the bathroom. Avoid strong divisions – use uniform tiles across the entire floor and walls. This will make the interior look cohesive and more spacious.
6. Ensure good lighting in the shower zone. Discreet LED lighting over the shower adds ambience while improving comfort and safety in this area.

A 4 m² bathroom with a shower can be not only comfortable but stylish too – all it takes is a bit of planning and a few good decisions.

4 m² bathroom – a layout with a bath for true relaxation

Only four square metres, but you don’t want to give up bathing? It’s possible! A 4 m² bathroom with a bath-led layout requires a considered design, but it can be just as functional as the shower version.

Choose a compact 140–150 cm bath, preferably a corner or asymmetrical model. That way you’ll free up space for other elements such as the basin or a cabinet.

A good solution is to pair the bath with a screen – this gives you a shower function without sacrificing baths. Opt for a light colour palette, a large mirror and slim cabinets – this will make even a small bathroom feel more spacious.

For best effect, use the same tiles on the walls and floor to visually enlarge the interior.

A 4 m² bathroom with a washing machine – how to find space for an extra appliance?

Seems impossible? And yet – a 4 m² bathroom with a shower and a washing machine is a realistic option, even in a very limited space. The key is to use every centimetre smartly and choose the right solutions.

Here are some tried-and-tested ideas to help you find room for a washing machine without compromising on comfort:

1. Choose a slim-depth washing machine. These appliances are 33–45 cm deep and are perfect for small bathrooms. You can easily fit one next to the basin, in a recess or under a worktop.
2. Integrate the washing machine into the bathroom cabinetry. Choose a cabinet with a door to conceal the appliance – you’ll get a neat, cohesive interior and extra worktop space above. In the same built-in you can plan shelves or drawers for detergents, towels and other accessories.
3. Use the space above the washing machine. The wall above is ideal for vertical storage. Hang cabinets, open shelves or baskets for detergents, toilet paper and cleaning products. This gives you lots of storage without taking up floor space.
4. Plan an in-line bathroom layout. Placing all elements – the basin, washing machine and shower enclosure – in one line along a wall makes the space feel larger and more orderly. It’s ideal for narrow, rectangular bathrooms.
5. Combine the washing machine with the basin worktop. A worktop above the washing machine can also hold a countertop basin. It’s a stylish, modern and very practical solution that saves a lot of space.
6. Use sliding or bi-fold doors. If you want to conceal the washing machine but don’t have room for traditional hinged doors, choose sliding or bi-fold. They save space and don’t block access to the appliance.

A well-designed small 4 m² bathroom can be fully functional – even with a washing machine and a shower! The key is to plan vertically and make use of every recess. You’ll gain more than you expect.

Which radiator to choose for a 4 m² bathroom – aesthetics and space saving

In a small bathroom, every element should be well thought out – including the radiator. What radiator suits a 4 m² bathroom best? One that combines functionality with a simple form.

The most popular choices are ladder-style heated towel rails – they not only heat the room but also act as a towel dryer. Consider an electric model if you don’t have access to a central heating system.

Match the radiator colour to the bathroom style – white, matt black or chrome are safe, elegant options. And adjustable output is an extra advantage that will translate into real savings.

How much does finishing and fitting out a 4 m² bathroom cost – a step-by-step budget

How much does a 4 m² bathroom cost? Prices can vary greatly depending on the materials and appliances you choose. An economical version, with a compact shower enclosure, basic sanitaryware and neutral tiles, costs in the region of 10–15 thousand zloty.

If, however, you opt for a 4 m² bathroom with a bath, premium tiles, designer brassware and made-to-measure furniture – the cost can rise to 25 thousand or more.

Remember to factor in labour costs and essentials such as lighting and the radiator. Every detail matters, so investing in quality usually pays off quickly – in the comfort of everyday use.

So if you dream of a beautiful and functional 4 m² bathroom – don’t wait! Start with a plan, choose tried-and-tested solutions and create a space that truly works day to day. And if you’re looking for more inspiration, check out our other interior design guides and start designing the bathroom of your dreams today.