Can you sell a house for €1?

Yes, you can sell a property for €1, but this has important tax implications. If you sell a house for more then €1 which is any property, you will be consider to be giving a gift to somebody else, so if you agree the price of €1 they pay you €1 and you do the transaction. The revenue, the government, will be interested to know what was the real value of the property. 

For example if the property was €100,000 and you sell it for 1 that is considered to be a gift of 999999 and that could have important tax implications for you and for the other person, but mostly for you, believe it or not. SO for this you will need professional advice from your solicitor or your accountant because even if you can do it, this means TAXES. So, get advice!