Unless the CCJ is small (less than £250) and over 1 year old a 100% mortgage is unlikely to be granted.

3 CCJ's up to £5000 will require a minimum 5% deposit.

CCJ's up to £10000 will require a minimum 10% deposit.

Information regarding CCJ's will remain on your credit file for a period of 6 years.

It is not always necessary to settle a CCJ prior to taking out a mortgage although it will obviously help if you have done so.