Bathroom Dimensions: Minimum Standards and Optimum Space

If you are preparing a construction or renovation project for your bathroom, you should understand the legal framework and accepted layout standards. There are important parameters to follow for a bathroom that is both easy to use and stylish, and even clearly defined rules determining how many square metres should be allocated to each room in a home. In the bathroom, the correct arrangement of sanitaryware and cabinets allows you to calculate the room's dimensions logically. After all, a bath bought in the wrong size or a poorly positioned basin counter can make a space feel cramped or empty.

The comfort of living in a flat or detached house depends not only on the number and size of its rooms, but also on the number and size of the bathrooms used by family members. For a bathroom to be practical, its dimensions need to meet the standards.

Bathroom fittings have standard dimensions, although these are not entirely fixed.

• Baths and shower enclosures play a part in determining the usable dimensions of a bathroom. The minimum standard shower enclosure dimension is 70 cm. Today's space-saving corner showers are approximately 80–90 cm wide.

• The minimum dimensions for a bath are around 152 × 76 cm / 81 cm.

• A width of 50–60 cm is sufficient for a single basin. For two basins side by side, you can consider dimensions of 60 × 120 cm or more.

• There should be 60 cm of clear space in front of the toilet. A bidet can be positioned 25 cm away from it. In general, at least 25 cm of free space should be left around each element in the bathroom for ergonomics and comfort.

• The dimensions for toilets with concealed cisterns are given as 40 × 45 cm. Design differences, such as a concealed or exposed cistern or a wall-hung toilet, will affect the space required. For a standard toilet, we can give an average width of 35 cm, a length of 50–60 cm and a height of 40 cm.

When designing a bathroom, pay attention to the space and dimensions required for all services and the position of the fittings, to ensure that everything works correctly and is practical to use. Start by drawing a plan. For a new-build project or a comprehensive renovation, determine the positions of the window and door, clean-water pipes and wastewater drains, electrical switches, local lighting in relation to the furniture, and any storage water heater, instantaneous water heater or combi boiler that will be in the bathroom. Seek professional support if necessary. At this first stage, the bathroom fittings you choose will determine the dimensions.