Your home may be repossessed if you do not keep up your repayments on your mortgage. You may have to pay an early repayment charge to your existing lender if you remortgage.
There is no guarantee that it will be possible to arrange continuous letting of a buy-to-let property, nor that the rental income will be sufficient to meet the costs of the mortgage. There may be a fee for mortgage advice.
The actual amount you pay will depend on your circumstances and the complexity of the case. The fee can be up to 1% of the mortgage balance being applied for but a typical fee is a set £449.