How to design a bathroom: the complete guide
Designing a bathroom, here is a comprehensive guide with bathroom layouts, regulatory compliance, recommended measurements, objects, and 3D models to download
Do you need to design a bathroom? Looking for diagrams, design tips, examples to follow?
In this focus, I will explain how to properly design a bathroom, providing you with examples of different types of bathrooms, technical drawings, renderings and a complete 3D project made with a professional software for engineers and architects.
We will also share some other free downloadable 3D models that you can use as inspiration for your own projects. To open and edit the 3D models, or to create new projects, you can use the same BIM architectural design software that I used.
To open this file and open and create many other 3D models, you can use the same architectural BIM design software used to produce the above mentioned file.
Bathroom render created with Edificius
This is a render of a bathroom designed using Edificius. Experience for yourself how to obtain similar photorealistic images in an easy and quick manner.
Download the project 3D BIM model (.edf file)
Download Edificius, the architectural BIM design software
Contents
Bathroom Layouts
Bathroom design represents a nuanced architectural dialogue within residential spaces, reflecting both functional necessity and aesthetic expression. Beyond mere utilitarian considerations, these intimate environments embody a complex interplay between user experience, spatial dynamics, and design philosophy.
In this blog article, we delve into the nuanced world of bathroom design within residential environments. We invite readers to complement this overview with our specialized guide on designing bathrooms for people with disabilities.
Residential bathroom typologies emerge as sophisticated spatial narratives, primarily manifesting through two distinctive archetypes:
- main restrooms
- secondary restrooms
The main restrooms are usually those accessible to guests and are strategically positioned to welcome and impress visitors. Characterized by expansive dimensions and refined design sensibilities, they transcend mere functional requirements.
How to design a bathroom | Rendering made with Edificius
They must be sized and distributed in such a way as to accommodate, in a usable manner, the following minimum equipment:
- toilet
- bidet
- sink
- bathtub or shower.
Furthermore, if it is not housed in a specially dedicated room, it is advisable to also plan for the installation of a washing machine, which can be placed in hallways or integrated into cabinets or custom furniture.
The renders you just saw were created with Edificius; these represent some examples of main restrooms.
Secondary restrooms (or service bathrooms) are those used by family members and do not have any representative role. They can be sized to contain only some of the sanitary fixtures listed above.
We’re now presenting a series of bathroom design layouts, meticulously crafted to optimize spatial functionality and user experience. Each design is tailored to the unique geometry of the environment, strategically positioning sanitary fixtures to ensure maximum usability and seamless navigation within the space.
Depending on the available space and architectural layout, bathroom fixtures can be strategically positioned in three primary configurations:
- Linear Arrangement
- Corner Configuration
- Opposing Side Placement.
Bathrooms with fittings arranged on one side
A streamlined design where fixtures are aligned along a single wall, ideal for narrow or compact spaces. This layout maximizes efficiency and creates a clean, minimalist aesthetic.
Layout of bathrooms with fittings arranged on one side produced with Edificius
Corner bathrooms
Perfect for irregular or L-shaped bathrooms, this arrangement utilizes corner spaces effectively, allowing for optimal use of challenging geometric environments. It provides a sense of spatial fluidity and can make smaller bathrooms feel more open.
Corner bathroom layout produced with Edificius
Bathrooms with fittings arranged on opposite sides
A balanced approach where fixtures are distributed across opposite walls, creating a symmetrical and functional layout. This design works exceptionally well in medium to large bathrooms, offering clear circulation paths and a sense of visual harmony.
Bathrooms with fittings arranged on opposite sides produced with Edificius
Windowless bathrooms with fittings arranged on opposite side produced with Edificius
Download the 3D BIM (.edf file) of the bathroom design
Download Edificius, the architectural BIM design software
How to design a bathroom
Several aspects need to be considered when designing a bathroom. When your layout and fittings are a good match for your family’s needs, you also need to think of creating a functional space that makes your morning rush that much easier.
bathroom floor plan produced with Edificius
Windows
As opposed to all the other rooms in a house, it is not necessary to have a window in a bathroom but an opening to the outside for the air exchange or a vacuum system is required.
Ceiling heights and tiling
Houses with high ceilings can often be used for creating extra storage spaces by means of false ceilings or suspended decks.
What about vertical tiling. Which heights should we reach?
Although there are no restrictions in exceeding 2 metres in height or more, these cladded walls work as a protective shield from little splashes of water, so they tend to be useful inside the shower or bath area or behind the washbasin.
More specifically:
- The shower walls need to be coated up to 2 mt
- For the washbasin area 1,20 – 1,40 mt should be sufficient
Top view render produced with Edificius
Lighting
Lighting a bathroom is always an important aspect. First of all, natural light must be designed where possible. Inserting windows or balcony windows takes the bathroom design to a whole different level.
When designing a bathroom, you should keep two types of lighting techniques in mind: scattered light and point light (washbasin and mirror area).
Scattered lighting is softer and with right intensity, can provide a sense of relax. On the other hand, point lights must be well organized in order to avoid creating shaded areas that can be uncomfortable for our eye-sight.
Wiring
The minimum standard requires at least 2 power outlets: one near the mirror and another one near the washing-machine if present.
Floor
Choosing the bathroom flooring is far different from choosing flooring flooring in other parts of the house. Water is prevalent in bathrooms and it will quickly ruin the wrong flooring so a non-slip floor should be installed avoiding smooth surfaces and glossy paints.
bathroom cross-section produced with Edificius
How to generate new design ideas for the bathroom with the help of AI
In the evolving landscape of architectural and interior design, artificial intelligence emerges as a transformative force, redefining how we conceptualize and create living spaces. AI architecture generators represent a groundbreaking technological frontier, transforming design conceptualization through intelligent, adaptive systems. By leveraging advanced algorithms and machine learning, they generate design concepts that are not merely templates, but living, responsive blueprints tailored to individual aesthetic preferences and practical needs.
In bathroom design, AI can analyze various aspects such as stylistic preferences and functional needs of the user to propose coherent and realistic solutions, optimizing the arrangement of fixtures, furnishings, and light points.
Moreover, thanks to integration with BIM and 3D modeling software, it becomes possible to preview different design options, experiment with combinations of colors and materials, and simulate natural and artificial light conditions.
AI also offers creative suggestions based on images, allowing for the exploration of original and functional solutions even in complex or limited spaces.
Among the solutions available today, tools like usBIM.codesign AI allow for the practical application of these capabilities, facilitating AI-assisted design and providing a digital environment where ideas, layouts, and materials can be tested and modified in real time. An approach that makes bathroom design more accessible, aware, and innovative.
For those eager to dive deeper into this fascinating intersection of technology and design, the article “How to use AI in architectural design and interior design: more efficiency and creativity”offers an illuminating exploration of these groundbreaking capabilities.
Electrical safety
When water and electricity mix, the result can be deadly. Bathrooms present high risks of electric shock compared to all the other rooms in a house. This is why following wiring and building regulations, together with the use of appropriate circuit-breakers, can often turn out to be life savers when electricity is used in combination with the presence of water.
Fittings installation
Bathroom fittings come in different shapes and configurations. Consulting the manufacturer’s technical data sheets can be of great help to avoid mistakes and installation errors.
Download the 3D BIM model( .edf file)
Download Edificius, the architectural BIM design software
FAQ on how to design a bathroom
How to correctly design a bathroom?
To design a bathroom correctly, both functional and regulatory aspects must be considered. It is necessary to include at least a toilet, bidet, sink, and shower or bathtub, possibly along with a washing machine. The arrangement of the fixtures can vary based on the shape of the space (in line, in a corner, on opposite sides) and must ensure good usability.
What is the difference between a main and secondary bathroom?
The main bathroom is usually larger, styled with care, and accessible to guests. It must contain all the essential fixtures. The secondary bathroom, on the other hand, is primarily used by the family and may have a reduced set of fixtures.
What are the types of fixture arrangements in a bathroom?
The main arrangements are: in line (all fixtures on one wall), in a corner (on two adjacent walls), and opposite (on two opposite walls). Each layout adapts to spaces with different characteristics.
Does the bathroom need a window?
It is not mandatory, but an opening to the outside or a mechanical ventilation system is necessary. Local regulations may be more restrictive.
At what height should the coverings be placed in the bathroom?
It is recommended to cover the shower walls at least up to 2 m and those behind the sink up to 1.20-1.40 m, to protect against water.
How can artificial intelligence assist in bathroom design?
AI can analyze needs and preferences to propose optimal solutions, support the arrangement of fixtures, test materials, and simulate light. Tools like usBIM.codesign AI integrate these functionalities into BIM environments.
How to correctly design lighting in the bathroom?
It is necessary to plan both natural (window) and artificial (diffused and focused) lighting. Focused light, particularly in the sink area, should avoid shadows.
How many light points and outlets are needed in a bathroom?
The minimum standard requires at least 2 outlets (one near the mirror and one for the washing machine) and at least 2 light points. The light switch should be near the entrance.
