We were considering moving last year. Taxes. agents fees, solicitors, notary, utiilies etc and the charges from a 180,000 property to a 225,000 property would have been almost 35,000 euro despite not being liable for CGT as we are residents and were transferring all the (non) profit to a new property. This is not counting the difference in price.
Of course, the iniquitous transfer tax on the new property at 10% would have accounted for 22,500 euro of that amount.
If we could have got a private buyer we'd have saved almost 8k on estate agent fees but the rest is money you won't get back. We decided to stay where we are and spent a small proportion of that on improvements.
You must transfer 100% of any profit to your new property to avoid paying CGT if you are a resident or be very old and have lived here for more than 3 years (like what we is).