Does checking the referencia catastral cost money?

No. Consulting basic cadastral data (reference, location, surface, use and mapping) is free at the Catastro e-office and requires no identification.

How many characters does a referencia catastral have?

Twenty: fourteen identify the property or plot, four the specific unit within the building and two are control characters. If your code has 14, it is the reference of the whole building, not of a specific dwelling.

Are the referencia catastral and the CRU the same thing?

No. The CRU (formerly IDUFIR) is the unique registry code assigned by the Land Registry; the referencia catastral belongs to the Catastro. The Registrars' e-office warns that they do not correspond.

What if my property does not appear in the Catastro?

It can happen with very old properties, recent segregations or registration errors. The nota simple can still be requested by registry details or address, and the cadastral issue can be regularised before the corresponding Catastro office.

How to find the referencia catastral of a Spanish property in 2 minutes

What the referencia catastral is

The referencia catastral is the unique identifier the Catastro assigns to each property in Spain. It has 20 characters (letters and numbers): the first ones identify the plot or the collective building, the next ones the specific unit within the building, and the last two are control characters.

Although it belongs to the Catastro and not to the Land Registry, it is the most practical piece of data for identifying a property without errors when preparing a registry request, a contract or a tax procedure.

Where to find it

On the IBI bill: the most common place. Look for a 20-character code next to the property details.
In the escritura or a previous nota simple: many modern deeds and registry documents include it.
At the Catastro e-office (sedecatastro.gob.es): you can locate it free of charge by address or on the map, without identifying yourself, in the cadastral data consultation.
On the Registrars' Geoportal (geoportal.registradores.org): searching an address shows the referencia catastral of each unit in the building, very useful when the property is a specific flat within a larger building.

What you will need it for

Requesting a nota simple: it is not registry data, but it helps identify the property without ambiguity. Beware: an address alone is sometimes not enough; in a real check, a Barcelona building with 27 units did not differentiate the penthouse in the address listing, and the referencia catastral solves that problem.
Tax procedures: tax returns, municipal capital gains, main-residence checks.
Contracts and listings: identifying exactly what is being sold or rented.
Checking discrepancies: comparing the cadastral surface and description with the registered ones before buying.

What the referencia catastral is not

It is not the finca registral nor the CRU/IDUFIR: they are identifiers of different registers and do not correspond to each other. The Registrars' e-office warns about this expressly.
It does not prove ownership: the Catastro is a tax register; whoever appears as cadastral holder may not match the registered owner.
It does not replace the nota simple: to know charges and legal ownership you must go to the Land Registry.

Practical tip

If you are going to request a nota simple by address and you know the exact flat (stairwell, floor, door), locate its referencia catastral first at the Catastro e-office or on the Geoportal. With it you avoid the most common mistake: requesting the note for the wrong unit within the same building.

If you do not have the exact address

Sometimes the problem is not searching the reference but locating the property itself. Options:

The Catastro e-office map viewer: lets you browse the map and click directly on the plot or building; it then shows the cadastral reference and the basic data.
From a deed or an IBI tax receipt: the cadastral reference usually appears on the property tax (IBI) receipt and on many deeds and contracts.
The Registrars' Geoportal: lets you locate the property on the map and see its basic registry data, useful as a cross-check.

What the cadastral reference is for

Knowing the cadastral reference unlocks several procedures:

Consulting and downloading the cadastral record (surface, use, cadastral value, plot plan).
Proving property details to the administration (grants, licences, rebates).
Requesting a certificate of cadastral value if a procedure requires it.
Cross-checking data with the Land Registry before a purchase.

Frequent mistakes when searching for it

Mixing up the plot reference with the specific unit's reference: in an apartment building, each flat has its own 20-character reference; the plot's (first 14 characters) identifies the whole.
Typing it by hand with mistakes: it is a 20-character alphanumeric string; copy and paste it whenever you can.
Assuming it matches the registry property number or the IDUFIR/CRU: these are identifiers from different systems and they do not correspond.
Taking the cadastral surface as exact: it is an indicative tax figure; if it disagrees with reality or with the Registry, it is worth reviewing.

A practical tip

If you are going to request a nota simple or start a purchase, note down both the cadastral reference and the registry details (finca number, IDUFIR/CRU, the district Registry). Having both identifiers from the start avoids duplicate searches and negative location notes, which are also billed.

Step by step on the Catastro e-office

Go to the Catastro e-office and open the reference search or the map viewer.
If you know the address: enter street, number, municipality and province; the site returns the reference and the property's basic data.
If not: browse the map to the plot and click on it.
Save the full reference (20 characters) or download the cadastral record directly as a PDF.

The basic cadastral data query is free on the official e-office itself; only specific documents, such as certain certificates, are paid.