So far I have taken out a mortgage with a bank three years ago, re-mortgaged with them, then taken one out with another bank, and now moving the two mortgages to a totally different bank. Whatever amount of time each have told us it would take, it has taken four times that. Even when we had everything sent in, they lose things everytime. The quickest of all however, was PTSB who got us a top-up in about 3 weeks. Actually, no, the quickest reply EVER was when our solicitor applied for our redemption figures, so we could change our mortgage to another lender, PTSB were on the phone THAT DAY!! This was after we had waited for them to return our call for six months. So in all, quadruple whatever time the banks tell you it will take, and you'll get a good idea!