Every mortgage is unique to the borrower, so the documents or information needed will vary.
The basic information to get started with your mortgage application includes:
A basic Fact Find
Photo ID to verify your identity.
Utility bills to confirm your postal address.
Current bank statements and/or credit and debit card statements.
Once you proceed to a full mortgage application, there are several other details a lender will need to approve your loan - that might include trading accounts for a self-employed mortgage or rental income projections for a buy-to-let mortgage.