Urban planning · Public data
What the cadastre says about your plot, and what it does not
Almost everyone starts at the cadastre, and almost nobody knows where it stops. Spain’s Catastro describes the property — area, use, age, a drawing — and it does so openly, without identifying you. What it does not do is prove the plot is yours, tell you what you may build on it, warn you that it floods, or say the building is protected. Each of those four questions has its own source, and none of them is the cadastre.
The confusion is reasonable: the cadastral reference is the key half of Spanish officialdom uses to identify a property, the property-tax bill comes from it, and the lookup is free and needs no paperwork. None of that means the cadastre answers the question people are actually asking, which is almost always "what can I do here?" or "is this mine?".
What the cadastre does say
The Catastro is an administrative register that describes real estate, and its information serves, in the words of the law itself, the principles of general application and tax fairness. It was built to apportion taxes, and it describes property to that end. Its free lookup, which the Sede Electrónica del Catastro offers without any authentication at all, returns the non-protected data and the cartography: where the plot is, its area, what is built on it, the use and age attributed to those buildings, and the drawing. All of it fits in the descriptive and graphic PDF anyone can download.
What it does not say
| The question | The cadastre | Where the answer is |
|---|---|---|
| Is this plot mine? | Does not prove it | Land Registry: the nota simple |
| What can I build? | Does not say | Municipal planning; confirmed by the cédula urbanística |
| Does it flood? | Does not say | SNCZI national flood-zone mapping |
| Is the building protected? | Does not say | Municipal catalogue and cultural heritage register |
| Who owns it? | Protected data | Only with consent or a demonstrated legitimate interest |
| What is the cadastral value? | Protected data | The owner, in their own lookup |
The last two are worth underlining because they surprise people: ownership and property values are protected data. They are not withheld out of caprice but because they identify a person and their assets. That is why a well-built public viewer does not show them, and why ours does not either.
Being in the cadastre is not being the owner
The law puts it carefully: cadastral data are presumed accurate, but the legal pronouncements of the Land Registry prevail over them. The cadastre describes; the Registry declares rights. Where the cadastral holder and the registered holder differ, the registered one is taken for cadastral purposes unless the cadastral document is the later of the two. Put shortly: appearing in the cadastre is an indication, not a title.
The same logic applies to what is built. A pool or a porch appearing in the cadastre does not make it lawful: the cadastre describes what is there, it does not authorise what was done. Whether the work was legal is for the council to say, with its planning in hand.
The cadastre describes, the Registry declares rights, the council says what may be done. The three get confused because people only know the first.
Where each answer actually lives
- Ownership and charges: a nota simple from the Land Registry.
- Land class and what may be built: the municipality’s planning; for a procedure, the cédula urbanística the council issues.
- Flood risk: the national flood-zone mapping, with its 10, 100 and 500-year return periods.
- Heritage protection: the municipal catalogue and the region’s cultural heritage register.
- Physical description and drawing: the cadastre, where almost everyone already was.
Five sources, four administrations, and nowhere they can be seen together. That is exactly the distance between "the data is published" and "a resident can find it", and the reason a plot lookup that crosses the layers and answers in plain language saves so many trips to the counter. In Torrelavega it sits inside SomosTorre and opens without registering.
Two exceptions worth knowing
The first is territorial: the Basque Country and Navarre run their own cadastres, so the national lookup does not cover property there. The second is about time: the cadastre reflects what has been declared, not what exists. Undeclared work does not appear, and a plot can carry an area for years that no longer matches reality. A viewer cannot fix that; what it can do is say how old the copy it is showing is, which is what we publish beside the data.
Where this comes from
From the consolidated Ley del Catastro Inmobiliario, approved by Real Decreto Legislativo 1/2004, for the nature of the register, the presumption of accuracy and the primacy of the Land Registry; and from the help pages of the Sede Electrónica del Catastro for which data are protected and what the free lookup returns. Consulted on 16 October 2026. For a specific case, ask your council or a qualified technician: this note explains where to look, it does not resolve files.
Frequently asked questions
Does the Spanish cadastre prove that a plot is mine?
No. The Catastro is an administrative register that describes property for tax purposes. Its data are presumed accurate, but the legal pronouncements of the Land Registry prevail over them, and where the cadastral and registered holders differ the registered one is taken unless the cadastral document is later. To prove ownership you need a nota simple from the Land Registry.
Which cadastral data are public and which are protected?
Ownership and property values, including the cadastral value, are protected data. Everything else — location, area, use, age and the cartography — can be consulted freely at the Sede Electrónica del Catastro, which requires no authentication at all for that profile. Protected data require the owner’s consent or a demonstrated direct and legitimate interest.
Does the cadastre say what I can build on my plot?
No. What may be built is set by the municipality’s planning: land class, permitted uses and buildable area. The cadastre describes what already exists. For a procedure, the document that certifies it is the cédula urbanística issued by the council; a plot viewer gives an indicative answer for looking before you start.
What is the cadastral reference?
It is the unique twenty-character identifier of each property in the Spanish cadastre, and it works as the key half of officialdom uses to refer to a plot: it appears on the property-tax bill, in deeds and in municipal procedures. It identifies the property; it does not describe what rights exist over it or what may be done with it.
Where do I check whether my plot is in a flood zone?
In the national flood-zone mapping (SNCZI), which publishes zones by return period: every 10, 100 and 500 years. It is not in the cadastre. In Torrelavega that layer is consulted alongside the rest in SomosTorre’s plot lookup, with the caveat that it is indicative.