Flat definition
Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses (2019 edition), defines a flat 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.'
The previous edition of approved document b also suggested 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.'
The English Housing Survey Housing Stock Report, 2014-15, prepared by the Department of Communities and Local Government, gives the following additional categories:
- Converted flat: A flat resulting from the conversion of a house or former non-residential building. Includes buildings converted into a flat plus commercial premises (such as corner shops).
- Purpose built flat, low rise: A flat in a purpose built block less than six storeys high. Includes cases where there is only one flat with independent access in a building which is also used for non-domestic purposes.
- Purpose built flat, high rise: A flat in a purpose built block of at least six storeys high.
The Housing Grants, Construction and Regeneration Act 1996 (HGRA - also known as the Construction Act) suggests that “flat” means: ‘…a dwelling which is a separate set of premises, whether or not on the same floor, divided horizontally from some other part of the building.’
In North America, the term 'condominium' refers to residential blocks in which the residents own their individual flats and the common areas are owned jointly and managed collectively. Condominiums are distinguished from apartments, in that the flats are owned rather than leased.
[edit] Related articles on Designing Buildings Wiki
- Apartment.
- Approved documents.
- Bungalow.
- Condominium.
- Corridor access.
- Curtilage.
- Domestic building.
- Duplex.
- Dwellinghouse.
- Household.
- Housing stock / building stock.
- Main door flat.
- Maisonette.
- Penthouse.
- Residential definition.
- Room for residential purposes.
- Sheltered housing definition.
- Shop definition.
- Studio flat.
- Terraced house.
- Types of building.
- Types of dwelling.
- Use class.
- Workplace definition.
Featured articles and news
UKCW London to tackle sector’s most pressing issues
AI and skills development, ecology and the environment, policy and planning and more.
Managing building safety risks
Across an existing residential portfolio; a client's perspective.
ECA support for Gate Safe’s Safe School Gates Campaign.
Core construction skills explained
Preparing for a career in construction.
Retrofitting for resilience with the Leicester Resilience Hub
Community-serving facilities, enhanced as support and essential services for climate-related disruptions.
Some of the articles relating to water, here to browse. Any missing?
Recognisable Gothic characters, designed to dramatically spout water away from buildings.
A case study and a warning to would-be developers
Creating four dwellings... after half a century of doing this job, why, oh why, is it so difficult?
Reform of the fire engineering profession
Fire Engineers Advisory Panel: Authoritative Statement, reactions and next steps.
Restoration and renewal of the Palace of Westminster
A complex project of cultural significance from full decant to EMI, opportunities and a potential a way forward.
Apprenticeships and the responsibility we share
Perspectives from the CIOB President as National Apprentice Week comes to a close.
The first line of defence against rain, wind and snow.
Building Safety recap January, 2026
What we missed at the end of last year, and at the start of this...
National Apprenticeship Week 2026, 9-15 Feb
Shining a light on the positive impacts for businesses, their apprentices and the wider economy alike.
Applications and benefits of acoustic flooring
From commercial to retail.
From solid to sprung and ribbed to raised.
Strengthening industry collaboration in Hong Kong
Hong Kong Institute of Construction and The Chartered Institute of Building sign Memorandum of Understanding.
A detailed description from the experts at Cornish Lime.























