What is a habitable room?
Whether a room is a habitable room decides what it must provide: ceiling height, daylight, ventilation. The classification therefore comes before any requirement, and that is exactly where corners get cut most often. Piloti settles the classification first and only then the requirement.
In short
A habitable room (Aufenthaltsraum) is a room intended for people to stay in for longer periods, such as living rooms, bedrooms and workrooms; its requirements, for example on ceiling height, daylight and ventilation, are in OIB guideline 3 in the edition the state has declared binding. Piloti first settles whether a room is habitable and then what it must meet.
What the term means
The term separates rooms where people stay for longer from rooms they only enter briefly. Living rooms, bedrooms, children’s rooms, offices and meeting rooms are typical habitable rooms. Bathrooms, WCs, storage rooms, corridors and staircases generally are not.
The term is defined in the OIB definitions, and the requirements are in OIB guideline 3, “Hygiene, health and environmental protection”. The state decides which edition applies; some building codes and building-technology regulations add their own rules. So always read definition and requirement in your state’s version.
How Piloti helps
The “Hygiene” way of working first clarifies whether a room is a habitable room under OIB guideline 3, and only then what it must meet, citing down to the clause. If the room’s use is missing, Piloti asks for it. For an alteration, the “Bestand” way of working first classifies the project.
What depends on the classification
- Ceiling height: OIB guideline 3 sets a clear ceiling height for habitable rooms, with rules for sloping ceilings.
- Daylight and view: habitable rooms need daylight through windows of a certain size relative to the floor area.
- Ventilation: natural or mechanical ventilation as the guideline requires.
- The specific values are in the guideline in your state’s version. We deliberately do not state them here, because they read differently depending on edition and room situation.
Where it gets contested in practice
The roof conversion with low knee walls, the lower-ground room on a slope, the office in the basement, the kitchen-living room, the gallery, the home office in a former storage room: in all of these, the whole further design hinges on the question “habitable room or not?”.
In existing buildings, a change of use can also turn a room into a habitable room that never had to meet the requirements. Then the first question is whether the project counts as a change of use and which requirements apply to the existing building.
Good to know
Piloti takes window areas and ceiling heights from your design; it says which requirement applies and which value is needed for it. Responsibility for the design stays with the office.
Questions
What is a habitable room under OIB?
A room intended for people to stay in for longer periods, for example for living, sleeping or working. The term is in the OIB definitions and the requirements in OIB guideline 3, each in the edition that applies in the state.
Is a kitchen a habitable room?
It depends on size and use. A kitchen-living room where people stay for longer is usually treated as a habitable room; a small kitchenette usually not. The definition in your state’s version and the use shown in the drawing decide.
Can a basement room be a habitable room?
In principle yes, if it meets the requirements of OIB guideline 3, above all on ceiling height, daylight and ventilation. For a lower-ground room or on a slope this is often achievable, in a deep basement rarely.
What ceiling height does a habitable room need?
The minimum height is set in OIB guideline 3, with separate rules for rooms under sloping ceilings. The edition your state has declared binding is what counts, along with any deviations in state law.