Where the paper comes from
A certificate of no impediment, or nulla osta, says that nothing in Italian law bars your marriage. In Venice the registry office at the town hall writes it out and a registrar signs it. Here is how to apostille a Certificate of No Impediment once that signed sheet is in your hands. Without the stamp, a wedding office abroad has no way to trust the signature.
Which desk adds the stamp
A civil record from a town hall counts as an admin paper. That is why you apostille a Certificate of No Impediment in Italy at the Prefettura, the arm of the state in each province. Court judgments and notary acts travel a different road, through the Procura della Repubblica at the court. Bring the signed original, because a plain photocopy will not do.
Using it for a wedding abroad
Couples apostille a Certificate of No Impediment in Venice so a town hall, a church or a consulate abroad will set a date. The clerk there reads the stamp as proof that a real Italian registrar signed the sheet. Many such offices take only a recent paper, and some want both partners named on it. Ask them what they expect before you book the day.
What it costs and when to start
A tax stamp of €16 per document is due, and some papers are let off it. That is the apostille cost for a Certificate of No Impediment in Venice, on top of whatever the town hall asks for the sheet itself. How fast the file comes back rests on the queue that day, so leave room before the wedding date.
Language and how long it lasts
A stamp says who signed, not what the words mean. Where the wedding office reads another language, the legalisation of a Certificate of No Impediment in Venice should travel with a sworn translation. In Italy a translator signs the asseverazione, a promise that the text is true to the original, at a Tribunale. Keep the two sheets joined.