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BS7666 is the British standard for the representation of address information, in particular with reference to gazetteers. It is divided into four parts, with the most relavant parts to Hackney's LLPG project being parts 1 and 2 which cover street gazetteers, and land and property gazetteers. The essential elements of BS7666 as far as an LLPG goes are as follows:

BLPU (basic land and property unit) In simple terms, this is a piece of land or property. No entry can exist in an LLPG without a corresponding BLPU..
UPRN (unique property reference number) A nationally unique number assigned by the NLPG to local authorities in order to give a unique identity to a BLPU..
LPI (land an property identifier) This is often what is commonly called the street address.It is the identity given to the BLPU It must contain at least a PAON (see below) and every BLPU must have at least one LPI (although a BLPU can often have more than one LPI).
PAON (primary addressable object name) Part of the LPI, usually  a building name or street number.
SAON (secondary addressable object name) Part of the LPI used when describing the likes of flats or sub-units. A SAON cannot exist without an associated PAON.
Street All LPIs must contain a reference to a street in the street gazetteer. If a property does not lie on a suitably identifiable street, then one must be created. Unusual examples include islands in the middle of the Thames.
Postcodes Optional as many addresses are not  "addressable", meaning they do not have  postboxes. Postcodes are assigned to properties by the Royal Mail.

Address in pure BS7666

Address contructed from BS7666

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Page updated: 29 Jan 2013 

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