How old is the building? Finding the year it was built in Spain, and why it matters

Listings love "finca regia" and "edificio con encanto". Neither tells you the year, and the year is the one fact that decides which questions to ask.

How to find it in two minutes

1. Go to the Sede Electrónica del Catastro and choose the free public lookup (consulta de datos catastrales, no certificate needed).
2. Search by address (province, municipality, street, number) or by cadastral reference.
3. Pick the flat, or any flat in the building. The year is the same for all of them.
4. Read "Año construcción".

It's free and needs no ID. The public result leaves out the owner and the cadastral value, and the printout has no legal validity (Catastro).

This works the same in Barcelona, Madrid or Málaga. The exceptions are the Basque Country and Navarre: the state Catastro doesn't cover them, because their foral regimes keep their own cadastres (Catastro law, art. 1). There you look the building up on the cadastre of Álava, Bizkaia, Gipuzkoa or Navarre.

If the building had a total refurbishment (coded "R"), the Catastro records that date instead of the original one (Catastro FAQ). An 1890s Eixample building can show up as 1998. If the year looks too recent for what you see, ask for the ITE report or the escritura, which usually state the original date.

Why the year matters: a quick guide by era

If the building is from…	What to think about	What to ask for
Over 45 years old in Catalonia, over 30 in Madrid city	The ITE building inspection should already be done	The ITE report and its result
1950s–1970s	Some buildings across Spain used aluminous cement in their floor joists, which can degrade (aluminosis)	The ITE report, and any aluminosis test or repair
Before about 1980	Built before Spain's first comprehensive thermal standard (NBE-CT-79), so often little or no insulation	The energy certificate, and window or insulation works
Before mid-2002	Asbestos cement was legal until June 2002, in pipes, roofs and water tanks	Whether the community has an asbestos survey or removal plan
Any age	Lift, wiring, plumbing	The community minutes, for works done and planned

The inspection age depends on the region and sometimes the town. Catalonia requires the ITE before a building turns 45 (Decret 67/2015), which in 2026 means anything built in 1981 or earlier. See the ITE guide. Madrid city asks for the first ITE in the year after a building turns 30, then every ten years, and you can look up the inspection calendar for an address on the city council's site (Ayuntamiento de Madrid). Elsewhere, ask the property manager (administrador de fincas) when the last inspection was and what it found.

Aluminous cement was used in Spain from the 1950s to the 1970s, mainly in precast prestressed floor joists. The problem came to light in Barcelona and then turned up in other cities, Madrid among them (Informes de la Construcción, CSIC). On 11 November 1990 a building on Carrer del Cadí in Barcelona's Turó de la Peira collapsed, and a resident died. Around 35.000 flats in Barcelona were identified as affected afterwards (betevé, betevé). Many were repaired decades ago. A building from those years isn't necessarily affected, but you should ask.

For insulation, Royal Decree 2429/1979 (NBE-CT-79) was published in October 1979 and came into force three months later, across Spain (BOE). Earlier buildings weren't designed to any comprehensive thermal standard.

Spain banned selling and using asbestos from 14 June 2002. Material already installed may stay until it's removed or reaches the end of its life (BOE). Intact asbestos cement is usually left alone. Ask a specialist before drilling, cutting or renovating around it.

Old doesn't mean bad

Some of the best flats in Barcelona and Madrid are in buildings over 100 years old, with high ceilings, solid walls and, in Barcelona, hydraulic floor tiles. A well-kept 1900 building with a recent ITE and a new roof can be a safer buy than a neglected 1975 one. The year tells you which documents to read, and those documents decide whether to buy.