How to Use the CRU to Look Up Housing Information
If you’re in the middle of a property purchase and sale process—or you simply need to check a property’s legal status—it’s likely you’ve heard of the CRU. But what exactly is it, and why is it more reliable than the old IDUFIR?
In this guide, we’ll walk you through step by step how to use the Unique Property Code to get detailed information on any property in Spain quickly and safely.
What is the CRU and why do you need it?
The CRU (Unique Property Code) is the “ID number” of a home. It’s a unique 16-digit identifier assigned by the Land Registry to each registered estate (finca registral). Unlike the cadastral reference (which has tax purposes), the CRU focuses on the ownership and encumbrances of the property.
Until 2016, the IDUFIR was used, but the CRU has replaced it as the national standard for:
Identifying an estate unambiguously across the entire Spanish territory.
Speeding up the request for Simple Notes (Notas Simples).
Ensuring legal certainty in real estate transactions.
Steps to look up property information using the CRU
To check the legal information of a home (owners, mortgages, attachments, or servitudes) through the CRU, the most direct method is the electronic headquarters of the College of Property Registrars.
1. Access the Registradores.org Portal
Go to the official website of the College of Property Registrars of Spain. Head to the “Land Registry” section and select the “Simple Note” option.
2. Choose the search by CRU/IDUFIR
The system will offer several ways to search for an estate (by owner, by registry details, or by location). The “CRU Search” option is the most effective because it’s straightforward and removes the risk of errors from similar names or wrongly typed addresses.
3. Enter the 16 digits
Type in the numeric code. Make sure no digit is missing. Once validated, the system will locate the estate instantly.
4. Identify your legitimate interest
To obtain information from the Registry, you’ll need to state the purpose of your request (for example: “Legal investigation into the property for its acquisition” or “Inquiry about debts”). This is a legal requirement to comply with Data Protection laws.
5. Payment and delivery
The cost of a Simple Note is usually around €9.02 (plus VAT). After paying by card, you’ll receive the document as a PDF in your email within 2 to 24 working hours.
Differences between the CRU, IDUFIR, and the Cadastral Reference
It’s common to confuse these terms, but they operate in different areas:
Identifier | Entity | Main Purpose |
CRU / IDUFIR | Land Registry | Legal ownership, mortgages, and encumbrances. |
Cadastral Reference | Cadastral Office (Tax Authorities) | Physical location, square meters, and taxable value. |
Important note: For total security when buying a home on the Costa del Sol and the Mediterranean Coast, the ideal is to have both pieces of information. The Cadastral Reference will tell you how big the house is, but the CRU will tell you whether the house really belongs to the person claiming to sell it to you.
Where can you find a home’s CRU?
If you don’t know the code for the property you’re interested in, you can find it in:
An old Simple Note for the property.
The public deed for the purchase and sale.
The most recent IBI bill (in some municipalities, it’s already included alongside the cadastral reference).
Conclusion
Knowing how to use the CRU is essential for any buyer or investor looking for transparency. It’s the most powerful tool to prevent unpleasant surprises—like discovering hidden encumbrances after signing the reservation contract.
If you’re looking for a safe property with all the required legal guarantees, at Sol y Costa Mediterránea we’ll advise you at every step of the registry verification, so your only concern is to enjoy the sun.
