Short answer
A title number is the unique reference used to identify a registered property title. It normally appears on the Title Register and Title Plan for the property.
Official source: https://www.gov.uk/get-information-about-property-and-land/search-the-register
Why title numbers matter
A title number helps identify the correct registered record. It is especially useful where several properties share a building name, a flat number, a development, or a similar postal address.
Where you can find it
For England and Wales, GOV.UK explains that the title register includes the title number. Scotland uses title numbers on title sheets, and Northern Ireland records use their own registry references.
Do you need to know it before ordering?
Not always. You can usually start with the property address or postcode. If you already know the title number, it can help confirm the correct record.
Independent service note
LandRegistries.com helps customers search and order property documents. It does not replace legal, conveyancing or surveying advice.