This product is the same as a residential mortgage in that it is secured against the property that you are purchasing. If you default on the mortgage payments, then the lender has the same ability to force a sale of the property to recoup their money.
Unlike residential mortgages which are calculated on the basis of the applicant’s salary, buy to let mortgages operate differently. The mortgage lender applies a rent to interest (RTI) cover calculation, meaning the borrower must be able to prove they can obtain enough rental income from the tenant to cover the interest on the mortgage.
Usually the Loan to Value (the percentage of the property price you can borrow) will be lower so you will need a substantial deposit.
They are available in company name or individual. If you purchase in a company name, you may be required by the lender to provide a Personal Guarantee