Catastro document CSV: how to compare a copy without confusing authenticity with a property check

Neutral editorial AI illustration of document comparison; it is not a cadastral document, a real CSV code or evidence of rights to property.

A property buyer’s folder often contains different versions of the same document: an email attachment, a forwarded PDF, a photograph of a page and a printout with notes. A similar appearance does not yet answer where a particular copy came from. An electronic document from Spain’s Catastro bearing a CSV code has an official comparison route. It is useful to include this in document preparation, without turning the result into a promise that the entire transaction is safe.

Below is a practical editorial workflow for a homeowner or buyer. It helps organise copies, record the result of a check and formulate questions for a specialist. It is not a legal opinion, an assessment of a particular property or instructions for correcting cadastral data. An important distinction separates a document’s authenticity from what its contents allow you to conclude about an apartment, a plot or rights relating to them.

What exactly does a CSV check?

The Catastro page “Cotejo y descarga de documentos” states that the service allows an electronic document to be compared using its Código Seguro de Verificación, or CSV. The official description links this comparison to the integrity and authenticity of electronic documents from the Dirección General del Catastro. It also explains that the code appears in the right margin of every page of that authority’s electronic documents. This is a brief description of the service’s capabilities, not the result of checking the reader’s document.

This does not mean that a verified copy automatically proves ownership, the accuracy of physical boundaries, the legality of works or that every detail will be current on the date of a future transaction. Those questions require a separate examination of the relevant documents and circumstances. It is easier to distinguish two tasks beforehand: first establish the origin of a particular electronic copy, then determine what conclusions its contents support.

Start by asking why the document was sent to you

Before working with the code, write down why you obtained the file. For example, you may want to understand which cadastral information concerns the property offered, pass materials to your specialist or compare two copies sent on different days. These are different working tasks. If the purpose is undefined, even a document that opens successfully can easily become a vague confirmation in correspondence that “everything has been checked”.

Ask the sender to identify the document, its date and why it was included in the discussion. Clarify whether it concerns the apartment, plot, garage or another part of the offer. Do not replace that answer with an assumption based on the filename. A name such as “house documents” is convenient in correspondence but explains neither the attachment’s composition nor how each page relates to your question.

Record separately the claim accompanying the file. “Here is a copy of a cadastral document” is considerably narrower than “the document confirms everything needed for the purchase”. The first statement can be discussed in terms of a particular copy’s origin and contents. The second requires clarification: what exactly was checked, by whom, against which materials and as of what date? Do not let a technical comparison result quietly replace those answers.

Keep the original file unchanged

Create a separate working folder and save the attachment as originally received. Use another copy or a separate text file for your notes. If you crop margins, rearrange pages or add a signature directly to the only copy, it will later be harder to explain what the sender provided and what you compared it with. Organising a folder does not authenticate a document, but it makes the check reproducible.

In the checking log, it is enough to record the date received, the delivery channel, a clear description of the sender and the saved filename. There is no need to transfer all personal details from the document into a shared work chat. If the material came through an intermediary, state that explicitly: “received from the representative”, rather than “received from Catastro”. A chain of forwarded messages and an official source are not the same thing.

If you received only a screenshot or a photograph of a page, ask for the original electronic copy where possible. This is an editorial recommendation to make comparison easier, not a claim that every photograph is invalid. An image may omit margins, continuing text or an adjacent page. While the material is incomplete, describe it that way in your notes rather than filling in missing information by guesswork.

Distinguish the official address from a link in correspondence

Use the official page linked at the end of this article for the comparison. Before entering the code, check that you have opened the Sede Electrónica del Catastro on sedecatastro.gob.es, not a similar-looking page from a message. Do not treat a logo image, familiar colour or the word “cadastre” as sufficient proof of a website’s origin. If the address raises doubts, stop and clarify the route through the official resource.

Our task here is to compare a document, not to purchase a service, share banking details or instruct an intermediary. Do not proceed to extra actions simply because the message accompanying the PDF suggests them. If login is required or further conditions arise, read them on the official page and clarify whether they are necessary in your situation. This article does not promise the same access procedure for every document type and every user.

Do not publish a real CSV in public comments, advertisements or general illustrations. Working with the code and copy should reflect the purpose of sharing and the people who actually need the material. A hypothetical example without real identifiers is sufficient for discussing the procedure. This approach does not replace data protection rules, but helps prevent you from inadvertently spreading a document more widely than necessary.

Transfer the code carefully and record the observed result

Find the CSV in the received document while retaining the page’s context. Do not confuse it with a case number, cadastral reference, filename or an intermediary’s internal mark. If the labels alongside identifiers are unclear, ask for an explanation rather than trying random values. When transferring the code manually, check similar-looking characters and accidental spaces. Do not try to guess missing parts of an unreadable code.

After using the service, record only what you actually observed. For example: you obtained a document for comparison; the page displayed a message; the action did not finish; the code was illegible in the original copy. Do not call a document forged simply because one attempt failed to produce a clear result. The difficulty’s cause needs to be established separately, keeping the message itself and the observation time.

If the service allows you to obtain a copy, store it separately from the attachment you received. Filenames can reflect their origins: “received by email” and “obtained during comparison”. These are your working labels, not official statuses. It is useful to record the date of access and a short result alongside them, so that a week later another participant does not mistake the files for two independent certificates of the property’s condition.

Compare the documents, not just the first page

Compare the entire available set: title, dates, number of pages, address descriptions and main text sections. Look at continuations, attachments and explanatory pages if present. Matching covers do not explain differences elsewhere in the file. Conversely, a different filename or the appearance of the viewing window does not in itself prove that the content has changed.

For convenience, make a short three-column table: document element, what appears in the received copy, and what appears in the comparison copy. Do not automatically merge similar identifiers. If one place shows an address and another an identifier, first establish how they relate to the same property. Mark an absent field as absent from the observed material, not as proof that the underlying fact does not exist.

Record a difference precisely: page number, field name and the discrepancy’s content. “The date differs on page two” is more useful than an impression that “the file is somehow different”. Do not independently conclude why the discrepancy occurred. It may require an explanation from the sender or a competent specialist; the table merely organises the question rather than resolving it for you.

Separate authenticity, date and connection to the property

Suppose a copy has been successfully compared, but its date is considerably earlier than the transaction being discussed. A proper working note should retain both facts: the comparison result and the document’s date. Do not replace the latter with today’s date simply because you opened the service today. The date a file was received, the document’s issue date and the date of the checking activity perform different roles.

Another example: a document appears to relate to the house in question, but the offer also includes a garage and a storage room. Comparing one copy does not automatically establish whether it covers every part of the offer. List each part separately and ask to see the corresponding materials. Do not infer that additional premises belong to the property merely because the seller sent them together in one folder.

If the cadastral description differs from what you see during a viewing or in other documents, record that question separately from the CSV. Do not alter the original copy to make it conveniently match, and do not describe technical comparison as a way of resolving the discrepancy. The next step is to establish with an appropriate specialist which documents and actions are needed for this particular mismatch. No universal correction procedure is proposed here.

What to send a specialist with your question

Assemble a small pack: the original attachment, material obtained during comparison, a date log and a list of specific discrepancies. Add an explanation of the purpose: for example, you need to understand the document’s connection to the apartment being discussed, not simply confirm that the file opens. Send the material through an agreed channel and do not include unnecessary documents belonging to other people that have no bearing on the question.

Instead of asking “please confirm that everything is in order”, formulate several narrow questions. Which property does this set concern? Is the document’s date sufficient for the purpose of the check? Which details need to be compared with other materials? Is further confirmation of a particular circumstance required? These questions help produce a substantive answer without confusing electronic authenticity with legal or technical assessment.

If the answer contains a qualification, keep it alongside the conclusion rather than in a separate, forgotten exchange. For example, the check was based only on the files supplied, or a particular question still requires another document. Do not abbreviate such an answer to “checked” for other participants. A short summary is useful only if it retains the boundary of what was actually established.

How to finish the check without unnecessary promises

Divide your final note into three sections: what was received, what could be compared and what remains to be clarified. For every unresolved question, state who received it and what answer is expected. Do not set an arbitrary date after which silence will be treated as agreement. This is a buyer’s working list, not a substitute for contractual terms, deadlines or professional opinion.

Before the next stage of the transaction, reread this summary rather than only the correspondence containing positive answers. If a decision depends on an unresolved circumstance, make it explicit to the participants. Payment arrangements, document signing and allocation of risks should be discussed separately with the relevant specialists. Successful CSV comparison is not, by itself, an instruction to transfer money or abandon further checks.

The main benefit of this workflow is a clear history of a single document. You know who supplied the copy, where you compared it, what you compared and which questions remain open. This supports a focused discussion without shifting meanings: the authenticity of an electronic copy remains the authenticity of that copy, while conclusions about property require their own grounds.

Sources and verification date

The official page was read on 30 October 2026: Sede Electrónica del Catastro — comparing and obtaining documents by CSV. The description of the service’s purpose and the code’s location is based on this page. Folder organisation, comparison tables and questions for a specialist are editorial recommendations from Laverna. No real code or document for a specific property was checked when preparing this material.