The Spanish cadastral reference: what it is and how to find it

The three places you may already have it

Before searching anything online, check whether one of these is to hand. The cadastral reference appears on all three, and not by convention: article 38 of the consolidated Cadastral Law requires it to be stated in public instruments, in documents recording facts or transactions affecting ownership, in tenancy or use-transfer contracts and in electricity supply contracts.¹

1. The IBI bill. The fastest route. It sits with the property details, usually in the header.
2. The deed. Purchase, inheritance or gift: the law requires the reference, so your deed carries it.
3. A utility contract for electricity, water or gas, where it often identifies the supply point.

But only four documents count as proof, and the list is closed. Article 41 says the reference goes into administrative files, public instruments and the Land Registry on the strength of the document you produce, "which must be one of the following":²

• An electronic cadastral certificate obtained through the procedures approved by the Directorate General of the Cadastre.
• A certificate or other document issued by the Manager or Deputy Manager of the Cadastre.
• The public deed or a Land Registry extract.
• The latest IBI receipt evidencing payment.

Read the fourth one slowly, because it carries two conditions almost nobody mentions. Not any IBI bill will do: it has to be the latest one and it has to evidence payment. And the electricity contract, which does carry the reference by mandate of article 38, is not on the article 41 list. Where the number appears and which document proves it is yours are two different questions.

Searching by address, step by step

At the Catastro's electronic office, in the property search:⁸

1. Choose province and municipality.
2. Enter the street type (calle, avenida, plaza), the name and the number.
3. If the building has several homes, pick yours by staircase, floor and door.

The result shows the cadastral reference alongside floor area, use and year of construction. The Cadastre itself lists three further routes to the same figure: the Puntos de Información Catastral hosted in town halls and other offices, the Gerencias del Catastro, and the electronic certificate.⁷

No digital certificate or Cl@ve is required, and the reason is written into the statute. Article 51 lists which cadastral data are protected: the name, surname, company name, tax identification code and address of registered holders, "as well as the cadastral value and the cadastral values of the land and, where applicable, of the building".³ The cadastral reference is not on that list. And article 52 says everyone may access unprotected data.³ That is why searching for the reference is open and looking up somebody else's cadastral value is not.

What those twenty characters mean

The cadastral reference is not a sequence number. Article 6.3 defines it as "an alphanumeric code that allows the property to be located unambiguously on the Cadastre's official cartography".¹ It is, literally, an address on a map.

For an urban property the Cadastre breaks the twenty characters down like this:⁷

You will often read that "the first fourteen identify the plot". That is not accurate: they are two blocks of seven, and the second one is cartographic. Every flat in a building shares the first fourteen characters not because those fourteen are a plot label, but because the flats share a plot and a map sheet.

For a rural property the layout is different, and anyone applying the urban split to a country parcel gets nonsense:⁷

The last two characters are check digits in both cases: they exist so that a computer can spot a mistyped reference before it goes looking for it.

A worked example, using the Cadastre's own references

The Cadastre publishes two examples on its own page. This is the urban one:⁷

9872023 VH5797S 0001 WX

• 9872023 is the plot.
• VH5797S is the map sheet.
• 0001 is the unit: the first one on that plot.
• WX are the check characters.

The neighbour across the landing, same building and same plot, would be 9872023VH5797S0002 plus their own two check characters. One block of four changes and nothing else.

And this is the rural one:⁷

13 077 A 018 00039 0000 FP

• 13 is the province (Ciudad Real).
• 077 is the municipality.
• A is the sector.
• 018 is the polígono and 00039 the parcel within it. Those are exactly the two coordinates any agricultural filing asks for.
• 0000 means there is no individualised unit inside the parcel, which is normal for land without buildings.
• FP are the check characters.

Add up the columns of either one and you get twenty. If your reference does not add up to twenty, a piece is missing: that is the commonest error when copying it off a scanned bill.

When the cadastral reference changes, and when it does not

Almost every page on this number calls it "unchanging". What is unchanging is against a change of owner: selling the house does not change the reference. Against operations on the land itself, article 18 of the Cadastre Regulation sets four rules, and two pairs of near-identical operations have opposite effects:⁶

Dividing and segregating are, to the person living through them, the same thing: splitting a piece of land. To the cadastral reference they are not. In a division the original number disappears; in a segregation it survives. The same asymmetry separates grouping from annexation.

Two further rules from the same article, both useful:

• A reference is never reused. "Under no circumstances may a property be assigned a cadastral reference that previously corresponded to another." A retired number stays retired, so the reference of a parcel that no longer exists cannot resurface on a different one.
• A change of polígono or block, and a change of class, do not move it. Your parcel turning from rural into urban does not alter its reference, even though the twenty-character layout of the two classes differs.

And one that matters when buying off plan: at the request of the notary authorising the deed, a provisional cadastral reference may be assigned to property still awaiting physical or legal consolidation, such as a building under construction or a horizontal-property division not yet completed.

Who has to produce it, to whom, and by when

Article 40 does not impose one general duty. It imposes a different one at each counter.²

• Before a court or administrative authority, the holders of rights in rem or of rights with real effect over the property.
• Before the notary, the parties requesting or executing the document.
• Before the Land Registry, whoever asks the registrar to make an entry.
• Before the utility company, whoever contracts the supply; and in private tenancy or use-transfer contracts, the landlord or transferor. Not the tenant.
• Outside those cases, the parties enter it themselves.

The deadlines also differ by recipient, and article 42 sets them: ten days from the request before a court or administrative authority, before the document is authorised at the notary, and during the processing period at the Land Registry. In every other case, when the document is issued or the contract signed.²

There are two ways out, and they are worth knowing before booking an appointment anywhere:

• If the notary or registrar obtains it themselves, you are released from the duty. Article 41.2 puts it that way: where the authority, the notary or the registrar directly obtains the electronic cadastral certificate, the parties or applicants "shall be excluded from the obligation".²
• Where several people are under the duty, one performing it covers all of them. Article 40.3.²

Article 39 then exempts four cases outright: the cancellation of security interests, administrative acts adopting or cancelling measures to secure public debts, deferral and instalment procedures and tax verification procedures where the administration already knows the reference, and Land Registry entries executing a court ruling or an enforcement order.²

One situation that arises more often than you would think: if the property has no reference yet when it was due, article 42 gives you one month from being notified of it to pass it on.²

What happens if you do not produce it

Here the usual answer is the opposite of the correct one. Failing to produce it stops nothing. Article 44 is explicit: the failure does not suspend the procedure or prevent its resolution, does not stop the notary authorising the document or affect the validity of the document or the transaction in it, and does not prevent the corresponding entries at the Land Registry.² All that happens on the documentary side is that it is recorded: the authority, notary or registrar must warn you expressly and in writing (article 43), and the omission is noted in the file, in the notarial document itself or in the margin of the registry entry.²

What does happen sits fourteen titles further on. Article 70(b) makes failure to produce the cadastral reference, and producing a false or falsified one, a simple tax infringement.⁴ Article 71 prices it: a fine of 60 to 6,000 euros.⁴

So the deed is valid and the person is liable. Two separate planes, and hardly anyone separates them.

Article 70(b) also carries the only defence, and it is a narrow one: you are released if the reference does not exist or cannot be known through the means listed in article 41.1 "or directly through the Cadastre's virtual office".⁴ The statute names the online search as one of the means you are expected to try. "I couldn't find it" only works if the address search does not return it either.

And there is an indirect cost that is not a fine and that is more expensive in time. Article 14.1(a) turns the information notaries and registrars send the Cadastre when ownership is acquired or consolidated into a communication, so that the Cadastre updates itself and you declare nothing. That communication is conditional, in these words, on "the interested parties having produced the cadastral reference".⁵ No reference, no communication; and with no communication the article 13 duty to declare comes back,⁵ on the two-month deadline the Regulation sets from the day after the event.⁶

Not the finca registral, but since 2015 they travel together

Confusing the reference with the finca registral is the expensive mistake, and the standard explanation ("separate bodies, separate numbers") stopped being the whole story on 1 November 2015, when the reform of the Mortgage Law by Law 13/2015 took effect. Since then:

• The Land Registry carries the cadastral reference. Article 9(a) requires every entry to include the cadastral reference of the property or properties making up the parcel "and whether or not the parcel is graphically coordinated with the Cadastre".⁹
• That coordination is public. Article 10.4 requires every form of registry disclosure, a nota simple included, to state the cadastral reference and whether the parcel is coordinated with the Cadastre as at a given date.⁹
• The Registry's graphic base is the Cadastre's cartography. Article 10.1 says so without qualification.⁹
• And the link runs both ways: when the registrar coordinates a parcel, they pass the registry code back to the Cadastre.⁹

Two figures in that reform are worth remembering. First: the graphic representation produced is taken to correspond to the parcel when both refer to broadly the same piece of ground and the differences in area do not exceed ten per cent of the recorded area.⁹ Second, and this is the surprising one: once the georeferenced graphic representation is registered, the parcel's area becomes the one that representation yields, rectifying whatever the literary description said before.⁹ The Cadastre's square metres can end up being the Registry's square metres.

It is also worth noticing that the operations which require a graphic representation under article 9(b), first registration, parcelling, re-parcelling, land consolidation, segregation, division, grouping, annexation, expropriation and boundary setting, are almost the same list that moves the cadastral reference under article 18 of the Regulation. The two norms are looking at the same operations from opposite sides.

The second confusion is easier to undo: the reference is an identifier, the cadastral value is an amount. You use the first to find the second. And neither of them is the reference value, which is the figure the tax authority has used since 2022 as the base for a purchase or an inheritance.

What you will need it for

• Signing deeds for a purchase, an inheritance or a gift.
• Declaring the property in your income tax return, including deemed income on a second home.
• Requesting a cadastral certificate, descriptive and graphic, which many procedures require and which is itself one of the four documents that prove the reference.
• Locating the cadastral value and, with the land portion, estimating the municipal capital gains tax on a sale, or checking an IBI bill.
• Setting up utilities or registering a rental contract.

One case has a rule of its own: if you are an heir, article 53.1(e) lets you access the protected cadastral information on the deceased's property, cadastral value included, without anyone's consent.³ That is the normal route to assembling the tax bases for Spanish inheritance tax when the bills cannot be found.

And one limit that surprises people: a registered holder may request data on adjoining parcels in order to identify them, but article 53.1(c) expressly carves the cadastral value of each of those properties out of that access.³ You can find out where your neighbour's land ends; not what it is worth.

If the Cadastre's data is wrong

If the floor area, use or boundaries shown do not match reality, you can request a correction of discrepancies. It is worth doing: that data feeds the cadastral value, and the cadastral value feeds the IBI, municipal capital gains tax and what you declare each year in income tax.

And if the discrepancy comes from something you did (finished building work, a change of use, a division), what is called for is not a complaint but a cadastral declaration, within two months of the day after the works finished, the change of use was authorised or the deed was signed.⁶ Since 2015 the correction can also reach you from the other direction: if the registrar cannot coordinate the parcel, they must report the reason to the Cadastre electronically so that the Cadastre can, where appropriate, open the relevant procedure.⁹

This information is educational and is not tax or legal advice. For a specific case, consult the Directorate General of the Cadastre or a professional.