Once you're not on a fixed/discounted rate, you should be able to transfer without incurring too many costs. It will probably cost around 65 euro to close with your current back and certainly less than 1000 euro in solicitor fees. However, you will need to submit a new application to NIB, same as before, i.e. bank statements, etc and also some fiddly things like reassigning home and life assurance. Is it really worth the hassle though as who's to say that NIB won't have higher rates in two or three years' time, after your fixed rate runs out? You may then be back in the same position as now.