Without knowing your personal circumstances - income, existing mortgage/loan repayments, if you are currently renting etc., it is diffiicult to say how you could qualify for a higher mortgage. A €240k mortgage over 30 years would cost approx. €1270 pm, rising to €1580 if interest rates increased by 2%, which is a little more than you are currently saving. Would you be comfortable committing to more than this by taking out a higher mortgage?
If so, would you qualify for a longer term that 30 years? Would you be in a position to rent a room? Do you have any existing loans that you could repay from your savings? These will all help to boost the amount you can borrow.
Just another question. Should currently having a house be a major obstacle to purchasing another? I thought it might be good because you have showed that you can repay the mortgage. I may only save 1500 a month but I overpay the current mortgage by €250 a month to offset any potential unforseen problems.
I have had the same resident for the last 3 years. The house was bought cheaply & houses in the area are not going down in price due to the estate being an established area with great transport links & schools.