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Street naming and numbering

When a building project creates a new thoroughfare or building, the developer has to apply to us to give a names.

Published: 28 January 2021

Last updated: 28 January 2021

Before you begin, read our guidelines on street and building naming and numbering.

Street naming and numbering guidelines

Street names

When a building project creates a new thoroughfare or building, the developer has to apply to us to give a name to the street, and a name or number to the building.

We have produced a policy and guidelines so proposals are sensible.

For new streets we ask for a name that:

  • has a historical or local link to the area
  • is easily spelled and pronounced
  • has a relevant suffix (such as road or avenue) 
  • does not duplicate a name already in use in Westminster or our neighbouring boroughs

Building names and numbers

A building's number should be in sequence of the street in which the main entrance is situated. If it is to be named, should not duplicate one already in use in the area.

Emergency services need to be able to find a property easily. We need buildings to be named and numbered conventionally, and marked clearly.

The location of the principal entrance is important, as it determines which street the property is numbered. A building may have two or more numbers in different streets if there are multiple entrances for separate uses.

Missing numbers

It is common for a building's name and number to be removed after alterations have taken place (a particular problem with new shopfronts). It's worth reminding designers that their drawings should show these clearly marked on the building.

The method of displaying names and numbers is given in council regulations.

Postcodes and Royal Mail's address database

The use of the Royal Mail database by providers of services or goods, to complete their customers' addresses, throws up a number of problems. Often the address being used by the customer is not as shown on the database, and the transaction cannot be completed. The Royal Mail will not alter the details on the database unless it receives clarification from the local authority that the address has been incorrectly assigned.

Although we are not responsible for issuing the postcode (this is the responsibility of Royal Mail), on request we will check our details of a property and advise Royal Mail what their database should show.

Contact the street naming and numbering team