# How to Design a Bathroom? 12 Steps from a Functional Layout to a Finished Interior - URL: https://f-projektow.pl/en/how-to-design-a-bathroom-12-steps-from-a-functional-layout-to-a-finished-interior.htm - ID: 403 - Blog: ybc - Published: 2026-09-15T00:00:00+00:00 Bathroom design should begin long before choosing tiles, taps, or the colour of the vanity unit. First, you need to plan the **functional layout of the room, fixtures, installations, storage and lighting**, and only then move on to materials and the appearance of the interior. The order in which these decisions are made largely determines whether the finished bathroom will be comfortable to use every day. From our experience working on bathroom designs, we know that even a small bathroom can accommodate much more than homeowners initially expect. At the same time, several seemingly minor mistakes — choosing the wrong width of cabinetry, doors colliding with fixtures, insufficient space around the washbasin, or poorly planned installation points — can make the room inconvenient to use for many years. That is why we have prepared a practical guide explaining **how to design a bathroom step by step — from the first measurements to preparing the interior for implementation.** ## How to Design a Bathroom? The Shortest Answer A good bathroom design should be created in the following order: - define the needs of the household members, - measure the room accurately, - prepare a functional layout, - set the budget, - choose between a bathtub and a shower, - plan storage and appliances, - plan the plumbing system, - plan the electrical system and lighting, - choose tiles and finishing materials, - define the colour scheme and details, - prepare visualisations and documentation, - review the design before renovation begins. The most important rule is simple: **function and installations first, appearance later.** ## 1. Start with the Needs of the People Who Will Use the Bathroom There is no single perfect bathroom layout that works for everyone. A bathroom for one person is designed differently from a bathroom for a family with children, and differently again from an additional bathroom located next to a bedroom. Before starting the design process, it is worth answering several basic questions: - who will use the bathroom, - whether a bathtub, shower or both are needed, - whether a washing machine and tumble dryer need to be placed in the bathroom, - how much storage space is needed for cosmetics and towels, - whether space for a laundry basket is required, - whether children will use the bathroom, - whether more than one person will use the bathroom at the same time, - which elements of the current interior are inconvenient. Only this information makes it possible to create a genuinely **functional bathroom design** rather than simply an attractive visualisation. ## The Design Should Reflect Your Lifestyle A common mistake is to begin the design process with a photo found online. Inspirations are useful, but they should primarily indicate the desired style. Just because a particular layout looks excellent in a large bathroom does not mean it will work in a bathroom measuring 4 or 5 m². When designing an interior, we first adapt the space to the user and only then adapt the style to the space. ## 2. Measure the Bathroom Accurately The next step is to prepare accurate measurements of the room. You need more than just the lengths of the walls. You should also take into account: - the height of the room, - the width and height of the door, - the direction in which the door opens, - windows and sill heights, - recesses, - chimneys and plumbing risers, - sloping ceilings, - existing connections, - radiators, - unusual projections and built-in elements. A difference of just a few centimetres can determine whether a chosen cabinet fits next to the shower enclosure or whether the door can be opened freely. For this reason, before purchasing bathroom fixtures and furniture, it is always worth working with the most accurate bathroom floor plan possible. ## 3. Design the Functional Layout Before Choosing Tiles This is one of the most important stages of the entire process. **The functional layout of a bathroom determines where the toilet, washbasin, bathtub or shower, furniture, washing machine, tumble dryer and other fixtures will be located.** In a small room, every element affects the others. Moving the washbasin may make it possible to install a larger shower. Changing the position of the washing machine may create space for a wider cabinet. Building in the toilet frame may also make it possible to create additional storage or a shelf. When preparing the layout, we analyse not only **whether the fixtures physically fit**, but above all whether they can be used comfortably. You should check: - the space in front of the washbasin, - whether the shower can be entered comfortably, - access to the toilet, - how drawers and cabinets open, - the direction in which the shower door opens, - access to the washing machine, - circulation routes. This is particularly important when designing [small bathrooms](https://f-projektow.pl/pl/aranzacje-wnetrz/category/male-lazienki.html), where a few poorly used centimetres can determine the comfort of the entire room. ## 4. Set Your Bathroom Budget Before Choosing Fixtures The budget should be part of the design process rather than something left until the very end. The cost of fitting out a bathroom includes, among other things: - sanitary fixtures, - taps and fittings, - tiles and other finishing materials, - furniture, - glass and shower enclosures, - lighting, - installations, - labour costs, - custom-made elements. It is worth deciding from the beginning which elements are the priority. If a large, comfortable shower is particularly important, the budget for decorative elements can be reduced. If spacious custom-made cabinetry is the priority, some of the other fittings can come from standard retail collections. ## Designing to a Specific Budget In our projects, we combine ready-made products with custom-made solutions. This allows us to adapt the design not only to the dimensions of the bathroom, but also to the client's actual budget. A good design should not only look impressive in a visualisation. It should also be **possible to implement within the planned budget**. ## 5. Bathtub or Shower? Make This Decision at the Beginning This is one of the decisions that has the greatest impact on the bathroom layout. ## Shower A shower is most often chosen for smaller bathrooms because it allows the available space to be used more efficiently. It can take the form of: - a traditional shower enclosure, - a shower installed in a recess, - a walk-in shower, - an enclosure with sliding doors. Large glass surfaces and a limited number of profiles can also make a small room feel visually lighter. If you are looking for examples of such solutions, see our [bathroom designs with showers](https://f-projektow.pl/pl/aranzacje-wnetrz/category/lazienki-z-prysznicem.html). ## Bathtub A bathtub can still work very well in a small bathroom — particularly in homes with children. Sometimes a good compromise is a bathtub with a shower screen, allowing both functions to be combined without taking up space for a separate shower enclosure. The most important question is therefore not: **“what is currently fashionable?”**, but rather: **“what will we actually use?”** ## 6. Plan Storage at the Bathroom Layout Stage A bathroom may look minimalist in a visualisation, but in reality it needs to accommodate cosmetics, towels, cleaning products, toilet paper, a hairdryer and many other small everyday items. If storage is not planned in advance, after just a few weeks all these items are likely to appear on the countertop and open shelves. Depending on the room, we use solutions such as: - vanity units with drawers, - tall cabinets, - storage above the concealed toilet frame, - recesses, - cabinets above the washing machine, - built-in washing machines and tumble dryers, - floor-to-ceiling cabinetry. In a small bathroom, using the full height of the room is often particularly effective, rather than adding more furniture at floor level. ## The Washing Machine and Tumble Dryer Are Also Part of the Design If these appliances are to be located in the bathroom, their position should not be decided only after the installations have already been completed. A washing machine and tumble dryer can be placed next to one another, stacked vertically, or incorporated into built-in furniture. Each of these solutions affects the installations, ventilation of the cabinetry, the way the fronts open and the amount of available storage space. ## 7. Plan the Plumbing System Only after the functional layout has been approved can the plumbing points be planned properly. This applies mainly to: - the washbasin, - the toilet, - the shower, - the bathtub, - the washing machine, - an optional bidet or bidet spray. One of the more expensive mistakes during a renovation is completing the plumbing before the final fixtures and equipment have been selected. A concealed tap, countertop washbasin, vanity unit with drawers or shower system may each require the wall to be prepared in a completely different way. For this reason, the design should come first, followed by installations adapted to the specific solutions selected. **Not the other way around.** ## 8. Plan the Electrical System and Bathroom Lighting A single light in the centre of the ceiling is usually not enough. In a functional bathroom design, it is worth considering several layers of lighting. ## General Lighting This provides even illumination throughout the entire room. ## Mirror Lighting This is necessary for everyday activities such as shaving, applying make-up or skincare. ## Decorative Lighting It can be used: - inside built-in furniture, - under cabinets, - inside niches, - around the bathtub, - in the shower area, - in the ceiling. Decorative lighting should not replace functional lighting, but it can completely change the atmosphere of the room in the evening. At the same stage, the location of electrical sockets, mirror power supplies, LED lighting and other devices should also be considered. In a wet room, all electrical solutions must be appropriate for the conditions in the specific zone and installed in accordance with applicable technical requirements. ## 9. Only Now Choose Tiles and Materials Many people begin planning a bathroom by visiting a tile showroom. From a design perspective, however, this should come much later in the process. Once the layout of fixtures and built-in elements is known, you can make informed decisions about: - where tiles are actually needed, - where they should end, - where joints will be located, - how they will align with the furniture, - which surfaces should become decorative accents. ## Are Large Tiles Suitable for a Small Bathroom? Yes. A small room does not automatically mean that small-format tiles are required. In many projects, larger, calmer surfaces and fewer grout lines help make the interior feel more organised. The layout of the tile divisions is much more important than the format itself. A visualisation makes it possible to check in advance where cuts will occur and whether the character of the material works well with the entire interior. ## 10. Choose the Colour Scheme, Mirror and Details Once the functional aspects have been finalised, attention can turn to aesthetics. The bathroom colour scheme should create a coherent whole with: - the tiles, - furniture fronts, - the countertop, - taps and fittings, - lighting, - the mirror, - accessories. In small bathrooms, we often use a calm base and a limited number of materials. However, this does not mean that every small bathroom has to be white. Beige tones, stone, wood, subtle greys or more saturated accents can work equally well when used thoughtfully. ## A Mirror Can Visually Change the Proportions of the Room A large mirror reflects light and the interior itself, which can noticeably increase the feeling of spaciousness, especially in a small bathroom. However, its width and shape should be matched to the entire washbasin area rather than treated as a random accessory purchased at the very end. ## 11. See Your Bathroom in a Visualisation Before Renovation Begins A floor plan shows the functional layout, but it does not always make it easy to imagine the proportions of the finished interior. This is why a **3D bathroom visualisation** plays such an important role in the design process. It allows you to assess in advance: - the proportions of the fixtures, - colours, - materials, - the size of built-in elements, - the tile layout, - lighting, - the relationship between individual elements. It is much easier to change a material or the width of a cabinet during the design stage than after products have been ordered or installations completed. This is particularly important in small rooms. In one of our projects for a [bathroom measuring approximately 5 m²](https://f-projektow.pl/pl/projekt-lazienki-5m2-z-prysznicem-pralka-i-suszarka-jak-zaprojektowac-mala-przestrzen-bez-kompromisow.htm), careful planning of the individual zones made it possible to combine a shower, washbasin, toilet and built-in washing machine and tumble dryer. In a [bathroom measuring approximately 3 m²](https://f-projektow.pl/pl/projekt-lazienki-3m2-nowoczesna-funkcjonalna-aranzacja-z-prysznicem-walk-in-i-drewnem.htm), the key was to limit visual divisions and plan every function extremely carefully. Projects like these demonstrate that **the size of the room alone does not determine whether a bathroom will be functional — a well-designed layout is far more important.** ## 12. Prepare the Design for Implementation and Check Everything Before Work Begins The final stage is to translate the approved concept into the information required during implementation. Depending on the scope of the project, this may include: - a dimensioned functional layout, - the location of plumbing points, - the electrical and lighting layout, - drawings of custom-made furniture, - information about materials, - a list of fixtures and products. Before work begins, it is worth checking the exact models of the selected products once again. This is particularly important for concealed systems, shower enclosures, bathtubs, furniture and household appliances. **The safest order is therefore: design → selection of specific products → installations → implementation.** Not the other way around. ## How to Design a Small Bathroom? In a small bathroom, the same principles apply, but every centimetre becomes much more important. The following solutions often help: - limiting the number of materials, - using floor-to-ceiling cabinetry, - installing a large mirror, - using transparent glass around the shower, - carefully planned niches, - custom-made furniture, - a bright and visually organised base, - several sources of light. However, a small bathroom should not be designed solely with the aim of making sure that “everything fits”. The most important question is: **after all the elements have been placed, will the room still be comfortable to use?** This is the difference between simply filling a room with fixtures and genuinely designing a functional space. ## The Most Common Bathroom Design Mistakes Several problems appear repeatedly when we work on bathroom projects. ## Choosing Tiles Before Preparing the Layout An attractive material will not fix an uncomfortable interior. Function should always be resolved first. ## Too Little Storage Space A minimalist visualisation may look impressive, but a bathroom is a functional room. Space needs to be planned for the items used every day. ## Installations Completed Before the Design Changing the position of taps, drains or connections later can generate additional costs and limit the available design options. ## Only One Source of Light Poor lighting around the mirror is one of those problems that users notice every single day. ## Buying Products Without Checking Their Dimensions A difference of just a few centimetres in the width of a cabinet or depth of an appliance can cause it to collide with other fixtures. ## Designing Solely Based on Inspiration Images A photograph is an inspiration, not a ready-made solution for a different room. ## Is It Worth Having a Bathroom Designed Before Renovation? The smaller and more complicated the bathroom, the more important it becomes to plan the interior in advance. A professional [bathroom design](https://f-projektow.pl/pl/21-projekt-lazienki-projektowanie-lazienki.html) allows you to check the functional layout, appearance of the room, location of installations, fixtures and storage solutions before renovation begins. At Fabryka Projektów, we design bathrooms online based on dimensions, photographs, inspiration images and the client's expectations. Depending on the selected scope of the project, we prepare 3D visualisations, material specifications and shopping lists, while extended packages also include documentation for contractors and the location of electrical and plumbing points. This makes it possible to make many decisions **before work begins**, rather than solving problems only once the renovation is already underway. If the bathroom is part of a larger renovation or interior project, it is also worth considering a [complete apartment interior design](https://f-projektow.pl/pl/27-58-projekt-mieszkania-projektowanie-mieszkania.html). This makes it possible to plan materials, colours, installations and built-in furniture as part of one coherent concept. ## Bathroom Design Step by Step – Summary If you are wondering **how to design a bathroom**, do not start with the tiles. First, determine your needs, take accurate measurements and prepare a functional room layout. Then set the budget, choose the fixtures, and plan the plumbing, electrical system, storage and lighting. Only then should you move on to materials, colours and details. A well-prepared design allows you to see the final result before renovation begins and eliminate many potential problems while they can still be corrected without breaking into walls, altering installations or ordering replacement fixtures. **A functional bathroom does not begin with choosing the most beautiful tiles. It begins with a good plan.** ## FAQ – Bathroom Design ## Where Should You Start When Designing a Bathroom? Start by defining the users' needs and measuring the room accurately. The next step is to prepare a functional layout of the fixtures. Tiles, colours and accessories should only be selected later. ## What Should a Bathroom Design Include? The scope depends on the type of project. It may include a functional layout, 3D visualisations, selection of materials and fixtures, a shopping list, technical drawings, and the location of electrical and plumbing installations. ## Bathroom Design or Plumber First? It is best to determine the functional layout and select the specific fixtures first, and then use this information to plan the plumbing points. This helps reduce the need for later alterations to the installations. ## How Do You Design a Small Bathroom? The most important thing is to make maximum use of the available space without compromising ergonomics. Custom-made furniture, using the full height of the room, large mirrors, glass around the shower and a limited number of materials can all help. ## Bathtub or Shower in a Small Bathroom? A shower usually takes up less space, but the choice should be based on the users' lifestyle. In some cases, a bathtub with a shower screen can be a very good solution. ## Can a Washing Machine and Tumble Dryer Fit in a Small Bathroom? Often, yes. The appliances can be stacked vertically, placed under a shared countertop or incorporated into built-in furniture. Whether a particular solution is possible, however, depends on the dimensions of the room and the installation layout. ## When Should You Choose Bathroom Tiles? After preparing the functional layout and determining the position of the built-in elements and fixtures. This makes it easier to plan tile formats, divisions, cutting points and transitions between materials. ## Is a Bathroom Visualisation Worth Having? Yes. A visualisation allows you to assess the proportions, colours, materials, lighting and built-in elements before renovation begins and make changes without the costs associated with work that has already been completed. ## Can a Bathroom Design Be Prepared Online? Yes. To prepare a bathroom design, you primarily need accurate room measurements, photographs, information about existing installations, and a description of the client's needs and preferences. ## Is It Worth Designing the Bathroom Together with the Entire Apartment? If the entire apartment is being fitted out, a complete design makes it easier to maintain consistency between materials, colours and installations, while also allowing the budget for the whole investment to be planned rather than treating each room separately.