What is the usable floor area of a residential unit?

The usable floor area of a residential unit includes the interior space of rooms that directly serve your living needs. This includes rooms, the kitchen, bathroom, and hallway. It is worth noting that usable floor area measurements are taken after wall plastering is completed, which slightly reduces dimensions compared to the raw construction state.

A reliable developer always provides detailed data on this in the information prospectus. By choosing J.W. Construction, you gain access to precise technical data based on current and transparent building standards.

What building standards are used for measurements?

In Poland, specific guidelines apply to measuring property areas. Currently, the most commonly used standard is PN-ISO 9836:2015-12. It precisely defines where measurements should be taken and how to treat niches or door openings. These building standards determine whether your wardrobe niche or built-in closet space increases the final calculated area.

Remember to verify this in the apartment acceptance report, as any difference in area may affect the final settlement with your:

• developer in Warsaw,
• developer in Gdańsk.

Calculating apartment area with sloped ceilings

If your dream apartment is located in an attic, calculating the floor area becomes slightly more complicated. Regulations take ceiling height into account. Space higher than 2.20 meters is counted in full. Areas between 1.40 and 2.20 meters are usually counted as half. Anything below 1.40 meters is not included in the official usable area, although it can still be used for storage.

What is included in the usable floor area of a house?

What is included in a house’s usable floor area depends on its purpose. In addition to living rooms and bedrooms, it also includes pantries or laundry rooms. The situation is more complex with garages and boiler rooms, which are often classified as auxiliary or utility spaces.

Is a basement included in the usable floor area of an apartment?

This is one of the most common questions in sales offices. The answer is: no. This space is considered an auxiliary room, not a usable one. The same applies to balconies, loggias, and terraces. They also do not increase the official floor area, even if you use them every day.

Is a garage included in the usable floor area?

In multi-family buildings, a parking space in a garage hall is usually a separate property or a right of exclusive use. In single-family homes, a garage is typically considered a utility space. This means it rarely increases the usable floor area unless otherwise classified in the design documentation.

Is a boiler room part of the usable floor area?

In modern construction, a boiler room is treated as a technical space. It usually does not increase the usable part of the house. However, its size is important when calculating the total building area, so always check the tables in your project documentation.

Are stairs included in the usable floor area?

This question mainly concerns owners of houses and multi-level apartments. According to standards, the horizontal projection of stairs is included in the area of each floor they connect. It is considered essential circulation space, so it is treated as part of the usable building area.

FAQ – frequently asked questions

What is included in the usable floor area of an apartment?

It includes all residential and auxiliary rooms inside the unit, such as rooms, kitchen, bathroom, and corridors. Balconies, terraces, and basements are not included.

What is the difference between living area and usable area?

Living area includes only rooms intended for living, such as bedrooms and living rooms. Usable area is broader and also includes kitchens, bathrooms, and hallways.

Which rooms are not included in the usable floor area?

Mezzanines, balconies, loggias, and terraces are not included. Utility rooms outside the apartment, such as storage units and basements, are also excluded.

What standard defines usable floor area?

The most commonly used standard in Poland is PN-ISO 9836:2015-12, which defines how to measure apartments based on finished wall surfaces at floor level.