The majority of lenders now insist that your deposit comes from a non borrowed source, and will decline your application if you plan to borrow it. The lenders who will consider your application will assess your application with the new deposit loan as a financial commitment which decreases the amount you can borrow on the mortgage, and because it is a short term loan it will eat into borrowing capacity much more than you may expect.

[eg: €100,000 loan over 30yrs costs c. €420 before tax relief, but one tenth of that, €10,000 at personal loan rates over 3yrs will cost c.€313 per month which would reduce the amount you can borrow by approximately €80,000!]

Short answer: You should aim to have your own equity in the deal via savings, if you borrow a deposit then you are running an additional risk and our firm are of the belief that this is generally not in the best interest of the borrower.