Unfortunately, you can be declined. Reasons for rejection include: A poor credit score or past credit issues (credit check your credit file here ») Unreliable income Out of control spending or being credit hungry A lot of debt An incomplete or inaccurate application As frustrating as being rejected can be, it will give you the chance to iron out any possible problems. Not only will this help you when next applying for a mortgage in principle, but it will help you when applying for a mortgage too. Please note: Even if you do get a mortgage in principle, this is no guarantee that you will be accepted on your full application, as there will still be criteria you will need to meet. However, as we have already discussed, the chances of you being rejected for a mortgage will be reduced as you should have a clearer idea about the size of mortgage you need to apply for. Speak to YesCanDo for fee free advice, a smooth application process, and the mortgage offer you are aiming for.