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National Address Gazetteer infrastructure

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I am a contributing authority, do I need to use AddressBase®?

Eventually all Public Sector Mapping Agreement members will need to replace legacy addressing products they use with an AddressBase product.

Address Contributing Authorities will be entitled to receive the data in exactly the same format (DTF) and frequency as currently*, until an alternative acceptable dataset can be supplied to NLPG equivalent update frequencies (that is, daily). It is envisaged that any such alternative dataset will not be available before October 2014.

All other PSMA members, including street contributing authorities, will need to migrate their address product use by October 2014.

Any questions should be directed to your PSMA Account Manager or the PSMA helpdesk.

*Only available to those Members which, as at 31 March 2011, were in receipt of daily, weekly or monthly updates, as applicable.


We manage the National Address Gazetteer infrastructure which is the data storage and set of processes bringing together the existing local authority sourced addressing datasets together with Ordnance Survey, Valuation Office Agency and Royal Mail data. Through agreement between Ordnance Survey and Scotland's Improvement Service, working on behalf of Scottish Local Government, the National Address Gazetteer includes Scottish address data.

Local authorities provide their address update records to us on a continuous basis for inclusion in the National Address Gazetteer infrastructure. The National Address Gazetteer infrastructure contains over 40 million addresses. In every six weekly cycle we synchronise 2,599,000 changes and carries out a total of 3,440 data validation checks.

From NAG to AddressBase

The National Address Gazetteer infrastructure is the single source from which AddressBase products are developed and made available by Ordnance Survey. 

AddressBase® Premium, available from Ordnance Survey, is the most comprehensive and accurate geographic dataset of 40 million addresses, properties and land areas where services are provided. 

Thanks to the relationship with local authorities, users of AddressBase benefit from the most in-depth view of addresses throughout the property lifecycle – from planning permission, through construction, occupation and change of use to demolition and beyond.