How to find the year a building was built
The quickest route is the Spanish Cadastre's online office (Sede Electrónica del Catastro). Type the address or the cadastral reference into the property search and the record shows the use, the area and the year of construction. You do not need to be the owner or have a digital certificate: the Catastro publishes everything that describes the property as non-protected data, except the owner and the cadastral value.
Cross-check with other documents: the seller's title deed, the energy performance certificate, the building inspection (ITE or IEE in Spanish) if there is one, and the town hall's building permit. They do not always match, because some record the design year, others the completion date and others a later refurbishment. If two dates differ a lot, keep both and ask why: it is information, not an error to hide.
[1][2]Why the year matters: the rules that applied
A building follows the rules in force when it is designed, not when it is finished. That is why the year of construction hints at which insulation, earthquake-resistance and material requirements it had to meet. New standards also tended to allow a transition period: the NCSE-94 and NCSR-02 seismic standards, for instance, let designers keep using the previous standard for two years.
So a building completed in 1996 may still have been designed under the 1974 seismic standard, and one from 2003 under the 1994 one. Always read the year with a few years' margin backwards and, if it matters for your decision, ask the property manager or the town hall for the project or the building specification.
[4][5][6][7]What each period suggests: a quick table
1950s and 1960s: a period when high-alumina cement was used in prestressed floor joists; little or no thermal requirement; no seismic standard like today's. 1970s: high-alumina cement still appears in part of the decade; the PDS-1 seismic standard arrives in 1974 and the NBE-CT-79 insulation standard in 1979. 1980s: first buildings designed with mandatory insulation; asbestos was still legal.
1990s: the NCSE-94 enters into force in 1995, with two years of transition. 2000s: the NCSR-02 enters into force on 12 October 2002, and asbestos is banned from 14 June 2002. This table is a guide: it tells you what to ask, not what a particular building contains, and each point is explained with its source below.
[3][4][5][7][8]1950–1970: high-alumina cement and aluminosis
A 1992 article in Informes de la Construcción, a journal of the Spanish National Research Council (CSIC), sums up that high-alumina cement concrete was used in Spain between the 1950s and the 1970s to make prestressed floor joists. Over time this concrete can lose strength and favour corrosion of the reinforcement, which is what Spaniards call «aluminosis».
A building from that period does not necessarily have high-alumina cement joists: many were built with other materials. What the date does suggest is that you should read the building inspection and the owners' meeting minutes and, if there are doubts or symptoms, ask a surveyor to take samples. Only a laboratory test confirms or rules out the material.
[3]1974, 1994 and 2002: seismic standards
The PDS-1 seismic standard was approved by Decree 3209/1974 and published in the BOE on 21 November 1974. It was replaced by the NCSE-94 (Royal Decree 2543/1994), in force from 9 February 1995, and that in turn by the NCSR-02 (Royal Decree 997/2002), in force from 12 October 2002 and still widely called NCSE-02.
The year matters mainly if the building is in a municipality with significant seismicity according to Spain's National Geographic Institute (IGN). In a low-seismicity area, a building older than the NCSE-94 need not worry you more than a recent one. Cross the year with your municipality's seismic acceleration and, in active areas, ask whether there has been strengthening or a structural refurbishment.
[4][5][6]1979: thermal insulation and condensation
The NBE-CT-79 standard (Royal Decree 2429/1979) was published in the BOE on 22 October 1979, entered into force three months later and was mandatory for all building projects. It developed a first set of energy-saving measures from 1975 and covered issues not regulated until then, such as condensation on external walls.
In practice, a building designed before 1980 usually has walls and roofs without insulation unless it has been refurbished. You notice it in energy bills, in the energy certificate letter and in condensation damp around corners and windows. Before buying, ask whether the façade or roof has been renovated and with what.
[7]Until 2002: asbestos
The Order of 7 December 2001, published in the BOE on 14 December, banned the use, production and marketing of asbestos fibres and of products containing them. It entered into force six months later, on 14 June 2002, with a further six months to sell products made before that date.
A building built or refurbished before then may contain asbestos materials, typically fibre cement in downpipes, water tanks, ducts or roofs. While they are in good condition they are not usually an immediate problem, but any work that touches them is best left to a specialised asbestos contractor. Ask about them during the viewing and check the owners' meeting minutes.
[8]What HOUSINGFAX does with the year of construction
HOUSINGFAX takes the year and building type from the Catastro and turns them into one of the report's checks: «Which other risks are common in a building of this year?». For each relevant risk (aluminosis, asbestos, insulation, seismic standard, services) it gives a level in words, the reason and what to check. The same date feeds the aluminosis check, which crosses it with the building inspection where the regional register holds one.
It is 22 checks on official sources, each with date and link, as a PDF within minutes, with a one-off payment and no account. Start with the free report, which shows the traffic-light rating of each check with your building's real data; the Essential report costs €11 and the Complete report, with the building's registered condition, €19. You can look at a sample report first.
[1][2]Limits: what the year does not tell you
The year is a clue, not proof. It does not say which cement was used, whether the joists are damaged, whether the building was refurbished or what condition it is in today. A well-kept old building can be in better shape than a neglected newer one.
That is why neither the year nor a report based on public records replaces an on-site technical inspection of the building. If you see cracks, rusty joists or falling concrete, the priority is to have an architect or building surveyor look at it, whatever the date.
[2][3]Short answers
Where can I see the year my building was built?
In the Spanish Cadastre's online office: in the property search you enter the address or the cadastral reference, and the record shows the use, the floor area and the year of construction. The lookup is free and you do not need to be the owner or have a digital certificate, because the Cadastre publishes those data as non-protected. Compare it with the deed and the energy certificate.
Is the Cadastre year always the original construction year?
Not always. It can reflect a major refurbishment and differ from the deed, the energy certificate or the building permit, because some sources record the design year, others the completion year and others a later renovation. If the dates differ a lot, keep both and ask the seller or the property manager why; the project documents or the works report usually settle it.
Does a 1965 building have aluminosis?
Not necessarily. According to a 1992 article in Informes de la Construcción, published by Spain's research council CSIC, high-alumina cement was used in Spain for prestressed floor joists between the 1950s and 1970s, but many buildings of that period used other materials. Only a test on samples confirms the material. The year tells you to read the building inspection and the owners' minutes.
Until when was asbestos used in Spanish buildings?
The Order of 7 December 2001 banned the use, production and marketing of asbestos fibres and products containing them from 14 June 2002. A building built or refurbished before then may contain asbestos materials, mainly fibre cement in downpipes, tanks or roofs. In good condition they are not usually an immediate problem, but any works that disturb them should go to a specialist contractor.
Since when has thermal insulation been required in Spain?
Since the basic standard NBE-CT-79, approved by Royal Decree 2429/1979, published in the Official State Gazette on 22 October 1979 and mandatory for all projects from its entry into force three months later. A building designed before 1980 usually has uninsulated façades and roofs unless it has been renovated, which shows in the bills and in the energy certificate rating.
Sources you can consult
These references let you review the primary context. Their presence does not turn a source of context into a diagnosis.
- Sede Electrónica del Catastro (Spanish Cadastre online office) — Property searchOfficial source verified on 29 September 2026.
- Dirección General del Catastro (Spanish Cadastre) — Web services for non-protected dataOfficial source verified on 29 September 2026.
- Informes de la Construcción (CSIC, Spanish National Research Council), 1992 — Inspecting and repairing high-alumina cement joistsOfficial source verified on 29 September 2026.
- Decree 3209/1974, PDS-1 (1974) seismic standard — BOE (Official State Gazette)Official source verified on 29 September 2026.
- Royal Decree 2543/1994, NCSE-94 seismic construction standard — BOE (Official State Gazette)Official source verified on 29 September 2026.
- Royal Decree 997/2002, NCSR-02 seismic construction standard — BOE (Official State Gazette)Official source verified on 29 September 2026.
- Royal Decree 2429/1979, NBE-CT-79 standard on thermal conditions in buildings — BOE (Official State Gazette)Official source verified on 29 September 2026.
- Order of 7 December 2001 banning asbestos — BOE (Official State Gazette)Official source verified on 29 September 2026.
Prudent next step
Organise the available information without jumping to conclusions
The private flow separates evidence, gaps and limits. It does not confirm materials or determine the safety of the building.
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