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
Do you take the lead in a circular construction economy?
Help us develop and expand this wiki as a resource for academia and industry alike.
Warm Homes Plan Workforce Taskforce
Risks of undermining UK’s energy transition due to lack of electrotechnical industry representation, says ECA.
Cost Optimal Domestic Electrification CODE
Modelling retrofits only on costs that directly impact the consumer: upfront cost of equipment, energy costs and maintenance costs.
The Warm Homes Plan details released
What's new and what is not, with industry reactions.
Could AI and VR cause an increase the value of heritage?
The Orange book: 2026 Amendment 4 to BS 7671:2018
ECA welcomes IET and BSI content sign off.
How neural technologies could transform the design future
Enhancing legacy parametric engines, offering novel ways to explore solutions and generate geometry.
Key AI related terms to be aware of
With explanations from the UK government and other bodies.
From QS to further education teacher
Applying real world skills with the next generation.
A guide on how children can use LEGO to mirror real engineering processes.
Data infrastructure for next-generation materials science
Research Data Express to automate data processing and create AI-ready datasets for materials research.
Wired for the Future with ECA; powering skills and progress
ECA South Wales Business Day 2025, a day to remember.
AI for the conservation professional
A level of sophistication previously reserved for science fiction.
Biomass harvested in cycles of less than ten years.
An interview with the new CIAT President
Usman Yaqub BSc (Hons) PCIAT MFPWS.
Cost benefit model report of building safety regime in Wales
Proposed policy option costs for design and construction stage of the new building safety regime in Wales.
Do you receive our free biweekly newsletter?
If not you can sign up to receive it in your mailbox here.






















