Mortgages aren't really based on a multiple of your salary any more. Most lenders now take a percentage of your net monthly income (35%-40% generally, some even 45% depending on your circumstances). This is the sum you are 'allowed' to service all loans - any existing loan repayments/financial commitments and your new mortgage. These figures are stress tested at 2% above the standard variable rate so if interest rates rose by 2% you would still only be using 35%-45% of your net income to repay your mortgage.
Confusing?
Say your net monthly income is €3500 and you have no financial commitments. Assume that you can repay your mortgage over a 35 year term and the lender will allow you 40% of your net disposable income (NDI):
3500 x 40% = 1400 / 5.82 = 240,500 max loan.
The term over wich you cna repay the mortgage makes a big difference to the loan you qualify for.
If you are single with no dependents you can also include room rental. This can add another 30k/35k