An international lawyer on the limits of the most trusted signature in Italy

What an Italian Notary Does Not Check

The deed can be perfectly valid while the house is not what you think. Here is where the notary's protection ends, and your own checks must begin.

By Barbara Di Pietrantonio · International lawyer and luxury real estate strategist

In 2019, Italy's Supreme Court, sitting in its most authoritative formation, ruled on the sale of a rural building that had been renovated with works that did not match its building permit. One of the parties asked for the sale to be declared void. The Court held it valid. The deed quoted a building permit that really existed and really referred to that building, and for the validity of the sale that was enough. Whether the building on the ground matched the permit on paper fell, as the Court put it, outside the perimeter of the rule.

That judgment explains a misunderstanding I see in many international buyers. They assume the notary is the person who checks the house. In Italy the notary checks something else, with great care: the deed, and the registers behind it. The building itself is a different matter, and it is yours to check.

What the Notary Does, and Does Well

Let me be fair to the profession first, because the Italian notary does far more than witness signatures.

The notary is a public official who guarantees the legal certainty of the deed. Italian courts have also made clear that the role carries real duties towards the parties. According to the Court of Cassation, checking the land registers for mortgages and seizures is part of the ordinary diligence expected of every notary, and a notary who misses them can be ordered to compensate the buyer (Cass. 25026/2024). The searches must be updated to a date as close as possible to the signing, and if they are not, the notary must say so (Cass. 17147/2026). Above all, the notary owes the parties a duty of information and advice: a notary cannot simply transcribe what the parties declare and consider the job done (Cass. 33439/2022 and 23718/2023).

So the notary verifies who owns the property, whether it is burdened by registered mortgages or seizures, and whether the deed meets every formal requirement the law sets. That is a great deal. It is also, almost entirely, work done on documents and public registers.

The Building Permit Is Quoted, Not Compared

For buildings whose construction began after 17 March 1985, a sale is void unless the deed states, by declaration of the seller, the references of the building permit or of the permit granted in amnesty (art. 46 of Presidential Decree 380/2001). For older buildings, a similar rule applies under art. 40 of Law 47/1985.

Read what the rule requires: the references of the permit, declared by the seller. In the 2019 judgment (Cass. Sez. Un. 8230/2019), the Supreme Court confirmed that the sanction of nullity covers the absence of those references, or a permit that does not exist or does not belong to that building. When a real permit is quoted, the sale is valid whatever the building has become since.

For historic estates there is a further detail. For works begun before 1 September 1967, the permit can be replaced by a sworn declaration of the owner that construction started before that date (art. 40 of Law 47/1985). It attests when the building was begun. It says nothing about the terrace closed in 1982, the annexe built in 1990 or the pool added later, each of which needed its own authorisation.

The Cadastral Plan Is Declared, Not Measured

Since 2010, a deed transferring an existing building must also contain a declaration that the cadastral data and floor plans on file match the actual state of the property (art. 29, para. 1-bis, of Law 52/1985). It is a serious requirement: without it, the deed is void.

The declaration, however, comes from the owner, or from a technician's certificate in its place. In 2025 the Court of Cassation confirmed that the nullity sanctions the absence of that declaration, and that a contract containing it is valid regardless of whether the declared conformity is true, unless the falsity is so evident that anyone would see it at a glance (Cass. 27531/2025).

The cadastral plan, in other words, enters the deed as a statement. Nobody in the room has measured the rooms against it.

What Lives Only on Site

Everything that exists only on the ground stays outside the notary's natural field of view, because the notary's work happens on paper. That includes the condition of the structure, works carried out without any filing, boundaries that differ from the map, paths and rights of way exercised for decades, and the real use of outbuildings.

Some of these issues can become legal problems of the first order. Courts are increasingly demanding here as well: in one case the Court of Cassation held a notary liable for failing to investigate usi civici, ancient collective rights over land that can make property unsaleable, in an area where that risk was well known, even though the standard searches showed nothing (Cass. 30494/2022). That is good news for buyers. It is also a reminder of how far the standard searches can be from the land itself.

My professional reading is simple. The notary reads the registers. Unless you instruct someone to do it, nobody reads the building.

One Clause Worth Reading Twice

The duty to carry out the searches applies, in the Court's words, unless the parties expressly waive it for urgency or other concrete reasons (Cass. 17147/2026). In practice, this can appear as a short sentence in the deed, at the end of a long negotiation, when everyone wants to sign.

If you see a waiver of the searches, ask why before you accept it. Time pressure in a property sale is rarely a good reason to give up the one check the law places firmly on the notary.

What Nobody Tells You About the Notary

The notary's protection usually arrives after the damage. When a notary fails in these duties, the remedy is compensation. Compensation can be substantial, and the case law above shows that buyers do obtain it. But years in court and a cheque are not the house you meant to buy.

By the time you meet the notary, the decision is often already made. The checks that matter belong before you commit, and in Italy commitment can come well before the deed: an offer or a preliminary agreement can already bind you. The time to read the permits, the floor plans and the history of the works is before you sign anything.

The questions you ask decide what you learn. A notary must inform and advise. A buyer who asks precise questions about permits, amnesties, past works, rights over the land and occupants will receive precise answers. A buyer who asks nothing will receive a valid deed.

Who Should Worry, and Who Can Relax

The gap between the deed and the building is narrow for a recent apartment in a well-documented condominium, bought from a seller with a clean file.

It widens with every decade of history: a country estate, a villa with annexes and gardens, a farmhouse transformed over generations, land in an area with usi civici or heritage constraints. Those are exactly the properties international buyers are drawn to in Italy, and exactly the ones where the building and the paperwork have had the most time to drift apart.

Before You Sign Anything

Ask for the building permits and every later authorisation, and have a technician compare them with the property and with the cadastral plans. Ask what was built, changed or regularised over the years, and by whom. Find out who uses the land, and by what right. Then go to the notary with that file, and with your questions.

In my experience, the most expensive problems in Italian property are visible months before the deed, to anyone who reads the file with the building in front of them. The notary will protect the deed. Protecting the decision is a job that starts earlier, and it is the work I do with my clients.

Have you ever discovered something about a property after the deed that you wish you had known before? I would be interested to hear what it was, without names, of course.

Sources: Presidential Decree 380/2001, art. 46; Law 47/1985, art. 40; Law 52/1985, art. 29, para. 1-bis; Corte di Cassazione, Sezioni Unite, judgment no. 8230 of 22 March 2019; Corte di Cassazione, judgments and orders no. 30494/2022, 33439/2022, 23718/2023, 25026/2024, 27531/2025 and 17147/2026. Rules and case law as of October 2026.

This article is for general information only and does not constitute legal advice. Every property and every transaction must be assessed individually.