A Buy to let mortgage does not differ massively from a standard private owner-occupier mortgage. Borrowers taking out Buy to let mortgages are subject to standard checks.
If you have an ARLA member agent responsible for letting and managing your property, the rents achievable from your investment property may be able to be taken into account when the lender assesses your situation. The criteria do, however, vary from lender to lender.
Generally speaking, most lenders will require your rental income to be 125 per cent of mortgage repayments. For example, if you were paying off a buy to let loan of £500 per month, you would need to be clearing rent of £625.