A legal boundary map overlapping a photograph of a luxury frontline villa on the rocky coast of Tenerife.

The Hidden Danger of Illegal Extensions: Why You Need a ‘Certificado de Infracción Urbanística’ in Tenerife

ByAna Maria

Acquiring a luxury villa in Costa Adeje often involves properties that have been structurally modified over the years. A previous owner may have enclosed a terrace to create a larger living room, excavated a basement to build a home cinema, or installed a new infinity pool.

While these enhancements make the property visually appealing and drive up the asking price, a critical question remains: Were these modifications built with a legal municipal license?

In Spain, buying a property with illegal, unlicensed extensions means you inherit the legal liability for those infractions. The Spanish Notary will verify the title deed, but they will not send an architect to measure the house against the original blueprints. To protect yourself from inheriting demolition orders or severe municipal fines, your legal team must secure a Certificado de Infracción Urbanística (Certificate of Urban Infraction).

Here is the technical breakdown of how urban infractions work in Tenerife and how this certificate protects your investment capital.

1. The Anatomy of an Urban Infraction

An urban infraction (infracción urbanística) occurs when construction is executed without the mandatory Licencia de Obra Mayor (Major Works License) from the local Town Hall (Ayuntamiento), or when the construction violates the specific parameters granted in that license (e.g., building a three-story villa when the license only permitted two).

  • The Buyer’s Liability: Spanish urban law operates on the principle of “objective responsibility” tied to the asset.When you buy a property, you absorb its legal history. If the Adeje Town Hall discovers an illegal extension built by the seller five years ago, the enforcement action (fines or demolition) will be directed at you, the current registered owner.
  • The Statute of Limitations (Prescripción): In the Canary Islands, the town hall generally has four years from the completion of the illegal work to initiate a disciplinary file (expediente sancionador). If they fail to act within this window, the infraction “prescribes.” The structure cannot be legally registered as new, but it is protected from demolition (entering a state called Fuera de Ordenación).
  • The Exception (Protected Land): If the illegal construction occurred on protected rural land (Suelo Rústico de Protección), green zones, or within the coastal public domain (Ley de Costas), the infraction never prescribes.The demolition order can be issued decades later.

2. What is the Certificado de Infracción Urbanística?

This is an official document issued directly by the Urban Planning Department (Departamento de Urbanismo) of the local Town Hall (e.g., Ayuntamiento de Adeje).

  • The Guarantee: The certificate officially declares whether or not there is an active disciplinary file, demolition order, or unpaid urban fine registered against the specific cadastral reference of the property.
  • The Limitation: It is crucial to understand that a “clean” certificate only means the Town Hall hasn’t caught the infraction yet; it does not prove the house is fully legal. If there is a massive illegal extension that the Town Hall is simply unaware of, the certificate will come back clean.

3. The Due Diligence Protocol: Matching Reality with the Registry

Because the certificate only reveals known infractions, your conveyance lawyer and structural surveyor (Aparejador) must work in tandem to cross-reference three separate data points:

  1. Physical Reality: The surveyor measures the actual, physical footprint and constructed square meters of the villa as it stands today.
  2. The Catastro (Cadastre): Your lawyer checks the official tax registry to see how many square meters are declared for municipal tax (IBI) purposes.
  3. The Registro de la Propiedad (Land Registry): Your lawyer checks the Nota Simple to confirm the legally registered square meters on the title deed.

If the physical villa measures 400 sqm, but the Land Registry only shows 250 sqm, the seller has built 150 sqm of illegal extensions.

4. Resolving the Discrepancy Before Completion

If your due diligence uncovers unlicensed extensions, you must halt the transaction until the seller resolves the issue at their own expense.

  • Declaración de Obra Nueva: If the illegal extension is old enough to have passed the 4-year statute of limitations, the seller’s lawyer must execute an “Old New Build Declaration” (Declaración de Obra Nueva por Antigüedad).
  • This requires hiring an architect to certify the age of the extension, paying the corresponding taxes, and registering the “new” square meters at the Land Registry and Notary before you sign the final purchase deed.

Skipping urban due diligence in Tenerife is one of the most expensive mistakes a foreign buyer can make; demanding a Certificado de Infracción Urbanística and cross-referencing physical measurements against registry data ensures you are acquiring a secure asset, not a pending legal liability.

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