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Built-up area boundaries are defined and named by the ONS. (In ONS reports of the 2011 and 2021 censuses, many of these areas were called "built-up sub-areas" of larger urban areas; as of October 2024, the ONS has not defined a new nomenclature for the urban areas or released any data for them.)
For 2011 census data there are 5,493 built-up areas, of which 501 are divided into Built-up area sub-divisions (BUASD) for which data is also available. Each built-up area is named algorithmically, using Ordnance Survey place-name data.
the definition follows a ‘bricks and mortar’ approach, with areas defined as built-up land with a minimum area of 20 hectares (200,000 m 2), while settlements within 200 metres of each other are linked. Built-up area sub-divisions are also identified to provide greater detail in the data, especially in the larger conurbations. [1]
Expand the data to acknowledge the fact that many towns / cities have multiple definitions for which population statistics are compiled, and enlarge the tables to have perhaps three columns for: built-up area; conglomeration (temporarily using the 2011 data until the 2021 data is released); and area (if any) officially holding town or city status.
It also links postcodes to pre-2002 health areas, 1991 Census enumeration districts for England and Wales, 2001 Census Output Areas (OA) and Super Output Areas (SOA) for England and Wales, 2001 Census OAs and SOAs for Northern Ireland and 2001 Census OAs and Data Zones (DZ) for Scotland. [1]
Built-up area sub-divisions are also identified to provide greater detail in the data, especially in the larger conurbations." [1] [2] The total population of the built-up area defined on this basis in 2011 was 65,692 at the 2011 census [3] making Wrexham the fourth largest built-up area in Wales, and largest in North Wales at the time.
They were built up from postcode blocks after the census data were available, with the intention of standardising population sizes, geographical shape and social homogeneity (in terms of dwelling types and housing tenure).
The West Yorkshire Built-up Area, previously known as the West Yorkshire Urban Area, is a term used by the Office for National Statistics (ONS) to refer to a conurbation in West Yorkshire, England, based on the cities of Leeds, Bradford and Wakefield, and the large towns of Huddersfield and Halifax.