There are quite a few different reasons why people might decide to remortgage. The main one is probably price, but there are others as well.
You may feel that you are not getting the best service from your mortgage provider for some reason. Maybe you feel the customer service is not good enough, they have not treated you well enough or you want to deal with a company that works online. It may be that you local branch has closed down or that the staff are not very good. It can be a big shame if you do not get good service from a company, but it is important to feel like you a re valued and that they are listening to you and addressing any concerns that you have. Therefore, it is important to make sure that you are happy and changing company can be the best way of showing your displeasure.
Most people do remortgage because it will save them money. There are many places offering mortgages and the chances are that yo will be able to find somewhere cheaper. It is worth checking out the rates available and comparing them with what you are paying.
You will need to check out what the fees will be of changing over. It is likely that you will charged an administration fee for opening a new mortgage account and they may need to do searches and things which could cost more. You may also have to pay a fee if you are locked in with your current lender, this is most likely if you are on a fixed rate.
You may feel that these fees will make it nor worth changing, but they can actually be quite small compared with the cost of staying with the company. Many websites have mortgage calculators. Use one to work out how much you will pay back in interest with the mortgage you have and then how much you will pay with a different lender. It is very easy to do as you just have to type in the amount you are borrowing and how long for and then put in the interest rate. You will then see what a difference it could make. You might be surprised at how much you could save as only a small difference in interest rate can be very significant over the long term of a mortgage.