How Notary Transaction Data Works in Spain

In Spain, every property transaction must be formalised in a public deed (escritura publica) before a licensed notary. The notary verifies identities, confirms the terms, and witnesses the signing. The declared sale price, property details, and buyer information are all recorded.

This information is then shared with the Land Registry (Registro de la Propiedad) and the Catastro. The system is mandatory and universal: there is no way to legally transfer property in Spain without going through a notary.

Spain's Consejo General del Notariado (General Council of Notaries) maintains a central database of all notarial records. In October 2025, they launched the Portal Estadistico del Notariado, making aggregated housing market statistics publicly accessible for the first time. The database contains over 170 million notarial documents.

At area level, the available statistics include: average price per square metre, average total transaction price, average property size, number of transactions, and buyer demographic breakdowns (including nationality and age). Data is available at national, regional, provincial, municipal, and postal code level. It is updated monthly, covering the most recent 12-month period. Important: the portal currently requires registration and may have geographic access limitations for users outside Spain.

Individual property sale prices are not published. You cannot look up what a specific house or apartment sold for. Specific addresses or property identifiers are not disclosed, and buyer names and personal details are not accessible. The data is aggregated and anonymised to protect privacy.

In sub-areas with very few transactions, data may be suppressed or aggregated upward to prevent identification. Spain's Prime Minister proposed a full individual-price database in June 2025 (similar to the UK Land Registry), but the proposal was not approved by parliament. For now, only aggregate figures are publicly available. This is a known limitation of the Spanish market — and one of the reasons buyers rely on reports like ours to understand what properties actually sell for in specific sub-areas.

In the UK, the Land Registry publishes the exact sale price of every residential property transaction, searchable by address. This is the gold standard for price transparency. In the US, 'sold prices' are available through the MLS system in most states.

Spain sits somewhere in between: transaction data exists and is now partially accessible at area level, but individual prices remain confidential. This means that in Spain, buyers cannot simply look up comparable sales the way they can in London or New York. They depend more heavily on aggregated statistics and cross-referencing multiple data sources to understand what properties actually sell for in a given area. This information gap is structural — and it consistently favours sellers and agents over buyers.

The gap between asking prices (what's listed on portals) and transaction prices (what's recorded at the notary) is real and measurable. Without access to transaction data, buyers are negotiating blind, relying entirely on what agents tell them.

Understanding that aggregate transaction data exists, and that it systematically shows lower figures than asking prices, changes how you approach an offer. The information asymmetry between agents (who see transactions daily) and buyers (who see only asking prices) is one of the structural features of the Spanish market. Knowing the transaction-level data for the area you're buying in is one of the most effective ways to close that gap before you make an offer.