One of the most common mistakes when buying or selling a home is assuming that the information in the Land Registry and the Cadastre is the same. In reality, they are two separate agencies with different functions, and it's more common than you might think for them to differ. When this happens, the consequences can range from a simple bureaucratic inconvenience to a complete standstill in the transaction.
In this article we explain what each one is, why they may differ, and what you should do if you detect a discrepancy before signing.
01 · Two registers, two very different functions
Although often confused, the Cadastre and the Land Registry are independent bodies with different objectives:
- The Cadastre It is managed by the Ministry of Finance and contains the physical and economic description of all properties in Spain: surface area, boundaries, use, buildings, and tax ownership. It forms the basis for calculating the Property Tax (IBI) and the cadastral reference value.
- The Property Registry It is under the jurisdiction of the Ministry of Justice and has a legal function: to certify the legal owner, identify any encumbrances on the property (mortgages, liens, easements), and guarantee the legal security of transfers. The land registry extract (nota simple) is the document that summarizes this information.
The fact that both records exist independently means that no one automatically synchronizes them. Each is updated through different channels, and this creates discrepancies.
| Aspect | Cadastre | Property Registry |
| What does it record? | Physical and economic description of the property (square meters, boundaries, use, tax ownership) | Legal ownership, encumbrances, mortgages, real rights |
| Which organization does it depend on? | Treasury | Ministry of Justice |
| What is its value? | Administrative and fiscal (property tax base, cadastral reference value) | Legal and juridical (protection of private property) |
| Who prevails in case of conflict? | — | The Property Registry (registered public deed) |
| Is registration mandatory? | Yes, for all properties | It's not mandatory, but it is highly recommended. |
02 · Why they don't always match
Discrepancies between the Cadastre and the Land Registry are very common, especially in older properties or in rural areas. The most frequent causes are:
- Undeclared works and renovations: An extension, a terrace enclosure, or a structural renovation that was never reported to the Cadastre or the Registry creates a difference in meters that persists for years.
- Historical measurement errors: Previously, property taxes were calculated based on the registered square footage, so many owners declared smaller areas than they actually owned in order to pay less. These figures still appear in the Land Registry today.
- Outdated segregations and groupings: When a property is divided or joined to another, if the procedure is not carried out correctly in both agencies, the data becomes out of sync.
- Boundary changes: In rural areas or areas with old properties, the actual physical boundaries may differ from those described in the documentation, especially if a formal boundary survey has never been carried out.
| Cadastral use: a critical piece of information that is often overlooked In addition to the surface area, the Land Registry assigns a use to each property (residential, commercial, industrial, warehouse, garage, etc.). This information is crucial because it determines the cadastral reference value and the property tax (IBI) rate. A commercial property converted into a dwelling that is still listed as 'commercial' in the Land Registry may be taxed incorrectly and cause problems during a sale. Always verify that the cadastral use corresponds to the actual use of the property. |
| Did you know that…? Under Spanish law, in the event of a conflict between the Cadastre and the Land Registry data, the public deed registered in the Registry always prevails. The Cadastre has fiscal effect, but it is the Land Registry that legally protects ownership. |
03 · What are the consequences of a discrepancy?
Detecting a discrepancy early is key. If it's discovered during the transaction, it can cause delays, unexpected costs, or even halt the sale. The most common problems are:
- Block before the notary: If the difference in surface area between the Cadastre and the Land Registry exceeds 10%, the notary is required to initiate a coordination process before authorizing the deed. This involves hiring a technician and can delay the transaction by weeks.
- Tax surprises: If the Cadastre reflects a smaller surface area than the actual one, the cadastral reference value may be undervalued, which could lead to subsequent tax audits.
- Difficulties in obtaining a mortgage: Banks base their valuations on the actual surface area of the property. If the area recorded in the Land Registry doesn't match the area recorded in the Cadastre or the actual measurements, the valuation can cause problems and jeopardize financing.
- Conflicts between neighbors or adjoining property owners: Boundary discrepancies can arise during the sale and purchase process and open disputes about the actual limits of the property.
- Incorrect taxation due to misuse: If the cadastral use does not match the actual use of the property (for example, it is listed as 'commercial' but is used as a residence, or vice versa), the property tax (IBI) and the cadastral reference value may be calculated incorrectly. This can lead to additional tax assessments or claims from the Tax Agency.
| Special attention to rural properties Discrepancies are especially common in farmhouses, agricultural estates, and rural properties, where historical measurements are less precise and boundary changes or renovations are more likely to have gone unreported. If you are buying or selling this type of property, a preliminary review is essential. |
04 · How to detect and solve them
The good news is that detecting a discrepancy is easy if done before signing. Simply compare two documents:
- The simple note from the Property Registry: Request it at the relevant Registry or through its online portal. It includes the registered description of the property: surface area, boundaries, and encumbrances.
- The descriptive and graphic cadastral certification: Consult it for free at the Electronic Headquarters of the Cadastre using the cadastral reference of the property.
When comparing both documents, pay attention not only to the surface area but also to the assigned cadastral use. The most common uses are: residential (V), commercial (C), industrial (I), warehouse (A), garage (G), and offices (O). If the use listed in the Cadastre does not correspond to the actual use of the property, it is necessary to regularize it before the transaction, as this directly affects the reference value and the property tax (IBI).
If you detect a discrepancy, there are several ways to resolve it depending on its nature and magnitude:
- Difference up to 5%: The notary can correct it directly in the deed without the need for additional procedures.
- Difference between the 5% and the 10%: It can be resolved by providing an updated cadastral certificate and, in some cases, with the approval of the Registry.
- Difference greater than 10%: It requires initiating a cadastral-registry coordination process with the Land Registry, involving a technician. The estimated cost is usually between €1,500 and €2,500.
- Cadastre-specific error: It can be corrected directly through a discrepancy correction procedure at the Electronic Cadastre Office or in person.
| Rustic Corner Tip Don't wait until the notary to discover discrepancies in the information. Request the property registry extract and cadastral certificate from the very beginning of negotiations: these documents are quick, affordable, and can save you a lot of trouble. Our team can help you interpret them and address any discrepancies before they affect your transaction. |
Official references and resources
Electronic Cadastre Office — Descriptive and graphic cadastral certification: www.sedecatastro.gob.es
Property Registry — Request for a simple note: www.registradores.org
This article is for informational purposes only and is based on legislation in force as of April 2026. For complete and personalized advice, contact Rustic Corner: our team will guide you through every step of the process.
