- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 02 Nov 2018
The term ‘apartment’ refers to a self-contained housing unit that occupies only part of a building, typically, on a single level. It is generally associated with North American real estate, although apartments have been common as far back as the Roman times. The term itself is thought to have originated in the mid-17th century, from the French word ‘appartement’ derived from the Italian ‘appartamento’ in turn derived from ‘appartare', meaning ‘to separate’.
The term ‘apartment’ is sometimes considered to be synonymous with the term ‘flat’ commonly used in the UK. However, Approved document B, Fire Safety, Volume 1 Dwelling houses, defines a flat specifically as; 'a separate and self-contained premises constructed or adapted for use for residential purposes and forming part of a building from some other part of which it is divided horizontally.' and suggests that this '...includes live/work units, i.e. a flat intended to serve as a workplace for its occupants and for persons who do not live on the premises.’
For more information see: Flat definition.
In the UK, the term ‘duplex’ refers to an apartment (not a house) that includes two floors of accommodation, joined by an internal staircase. Historically, this would have been referred to as a maisonette, but the term duplex has become increasingly popular because of its perceived Americanism, and is generally applied to apartments with a more modern design, whereas a maisonette might be more traditional.
For more information see: Duplex.
The term 'penthouse' is used to describe an apartment on the top floor of a high-rise building. According to the New York City building code, a penthouse is ‘...an enclosed structure on or above the roof of any part of a building, which is designed or used for human occupancy.’ Penthouses are frequently the largest, most luxurious, and therefore the most expensive, apartments in a building.
For more information see: Penthouse.
 Related articles on Designing Buildings Wiki
- Domestic building.
- Flat definition.
- Residential definition.
- Room for residential purposes.
- Sheltered housing definition.
- Studio flat.
- Terraced house.
- Types of building.
- Types of dwelling.
- Types of room.
- Use class.
Featured articles and news
From alabaster to travertine – how many types do you know?
Well-designed lighting helps maintain a healthy physiological and psychological balance.
Transferring the risk for obtaining the target BREEAM rating.
A simple but effective way to determine the root cause of an issue.
BSRIA report suggest the European market will double to 415 million Euros by 2023.
Why a wellbeing strategy is vital for property managers.
An ECA briefing for members about the commercial implications of leaving the EU.
A crucial moment on any project - and fraught with danger.
The performance gap from a Northern Ireland perspective.
Book review: Buildings of protestant nonconformity.
Design and testing for health and wellbeing - free download from BRE.