Bathroom architectural plans, the complete guide

Planning a bathroom: the complete guide

How to design a bathroom? Here is a complete guide with bathroom floor plans, layouts, reference standards and 3D objects ready for you to download

It does not matter if the bathroom has to be renovated or built from scratch: planning a bathroom always involves several considerations such as where to install the various bathroom fixtures, the presence of windows, the minimum regulatory spaces , the actual spaces available and the number of users.

In this article we’ll be dealing with how to design a bathroom in residential houses and focus our attention on different bathroom layouts, windows installation, safety requirements and also provide a complete set of design and construction documents in .DWG CAD format with floor plans and cross-sections with relating BIM model produced using Edificius. An interesting case study project in the .EDF file format ready for download including a wide range of objects from ACCA software online BIM Object Library will add stunning furniture and other design elements to your project.

Download Edificius free trial version to open the project in the .EDF file format.


Bathroom rendering


Download the project 3D BIM model (.edf file)

Different bathroom plan layouts


Bathroom sketch

The main toilet of a house needs to be sized and organised in order to include the following sanitary elements:

  • Water closet
  • Bidet
  • Washbasin
  • Bathtub or shower-bath.

In some cases, it may also be useful to provide the necessary electric and plumbing connections for installing a washing machine if not placed somewhere else.

A half-bathroom can be sized to include only some of the fittings listed above.

The drawings below show some of the main fittings and how they can be arranged in a bathroom taking into account installation spaces and accessibility.

According to the spaces available, we can arrange our components in different ways, such as:

  • Bathrooms with fittings arranged on one side


Layout of bathrooms with fittings arranged on one side

  • Corner bathrooms


Corner bathroom

  • Bathrooms with fittings arranged on opposite sides


Bathrooms with fittings arranged on opposite sides



Windowless bathrooms with fittings arranged on opposite side


Download the 3D BIM model (file .edf) of the bathroom layouts


Click here to 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.



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 1,201,40 mt should be sufficient



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.


The minimum standard requires at least 2 power outlets: one near the mirror and another one near the washing-machine if present.


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.


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 project drawing DWGs

Click here to download Edificius, the architectural BIM design software