Some people switch mortgages because it will work out cheaper for them. For example, the introductory discounted interest rate may have finished with your current lender, and you might get a cheaper deal with another lender.
Other people remortgage to consolidate their debts.
It is worth noting that a remortgage isn’t always the most suitable option. Sometimes any saving made by securing a cheaper interest rate can be outweighed by the fees incurred in setting up the new mortgage and converting unsecured debt to secured debt may not be in your long term interest.
If you plan to switch mortgage, remember to look at the overall repayment period too. You may be able to pay less monthly, but check the final repayment date of the mortgage. It may be longer than your current deal.
You may be able to find a new mortgage deal with your current lender – and it may even work out cheaper to do so.
In fact, many lenders allow you to switch your mortgage deal quite frequently.