Street naming and numbering

Updated: 03.08.22

The Street Naming & Numbering service will be closed from Monday 8th August and reopening Tuesday the 16th. Sorry for any inconvenience caused.

Blackburn with Darwen Borough Council are responsible for allocating house numbers and road names to new developments and property conversions. We create new addresses and road names to adhere to central Government national standards

Individuals and developers must not allocate their own house numbers, building or street names.

The Council also maintains the definitive national record of all street names and property addresses (called the Local Land and Property Gazetteer or LLPG). Every night our master address database is sent to the UKs national address database to assist all Government departments and emergency services records.

View the street naming and numbering case map

The address of a property is important as many organisations, postal, emergency services and the general public need an efficient means of locating and referencing properties.

If a property is not ‘registered’ through the street naming and numbering process it will not appear on the main address database and the owner/occupier will encounter difficulties in obtaining mail, goods and services from a variety of sources (e.g. applying for a credit card, or purchasing goods by mail order).

The main address database is used by the Council, Royal Mail, all statutory undertakers, emergency services, credit agencies, satellite navigation system suppliers and many private companies.

Apply for a street name or postal number

You should contact the Councils Street Naming service if you are building new houses, commercial / industrial premises or undertaking conversions which will result in the creation of new address.

You should apply once you have received planning permission in the early stages of any new build or conversion.

Utility & broadband companies will not install services without an official postal address or postcode.

If your request relates to a new address on an existing street under normal circumstances we will allocate a postal address within 10 working days from receipt of a valid application.

If your request involves the naming of new street, under normal circumstances we will allocate a postal address within 28 working days from receipt of a valid application.

To apply for a street name or postal number, email or you can call 01254 585 585 and request to speak to the Address Management team.


Postcodes are exclusively created and maintained by Royal Mail.

They are a sorting and routing instruction for Royal Mail to deliver items of mail quickly and accurately. Royal Mail will only allocate a postcode once they have been notified by the council of a new postal address.

Copies of our new address documents are sent to Royal Mails Address Management Unit who then allocate postcodes.

Activate a postcode

After Royal Mail allocate a postcode they add the new postal address into the ‘Not Yet Built’ file (NYB). Only when a new property is built, occupied and can receive mail will Royal Mail update the address from the NYB file to the Postcode Address file (PAF)

You can contact Royal Mails Address Management Unit on 03456 011110 to update an address from NYB to PAF.

Fees and charges

The following fees apply:

New developments

  • New individual property: £55
  • New development (more than one unit) or redevelopment of existing building: £55 = £10 per unit
  • Alterations in either street name or property numbers to new developments after initial street naming and numbering has been undertaken: £110 + £10

Existing properties

  • Change of a house name/number: £55
  • Change of a building name (e.g. flats): £110
  • Change of street name (residents request): £220 + £20 per property. Plus the cost of any amendments required to Traffic Orders
  • The addition of a house name: £55
  • Confirmation of an existing registered postal address: £55