Hi Spudz,
We did what you are thinking about at present, we got a 92% mortgage on our new house which will be ready in 8 months and hold on to our old house. At the time the bank wanted us to sell our house first but we said that we wanted to keep on to it. we got an interest only mortgage as we have to pay stage payments. this option wasn't given and is not advertised but i insisted or else i would go to another bank..and it was given to us. you have to ask and set down what you want up front and say this is what you want, are you willing to do business?Our new mortgage is with PTSB and they seem to be willing to bend the rules for the business. also go to the bank directly if you want something like this as brookers won't be able to gaurantee this i think. If you hold on to your house for renting purposes you could be liable for stampduty etc, which has already been covered in other threads. we plan to sell and take the profit of the sale and reduce our mortgage on the new house this we also pointed out to the bank ie: we went in looking for 92 and after the sale it will drop to appro 70%.
best of luck and let us know how you get on..