Ten-Year Structural Insurance (Seguro Decenal) in Spanish Communities of Owners: What the LOE Covers and When It's Mandatory

Direct answer: if a Spanish property is showing a structural crack or foundation-related damage within ten years of the building's handover, the relevant cover is very likely the seguro decenal — a mandatory ten-year structural insurance under Article 19.1.c of Law 38/1999, on Building Standards (Ley de Ordenación de la Edificación, LOE) — not the community's ordinary annual insurance policy. Confusing the two is one of the most common mistakes foreign owners make when a structural problem appears in a Spanish building years after purchase, and it can mean pursuing the wrong insurer entirely.

These are two entirely separate policies, with different purposes, different policyholders and different durations. Understanding the distinction protects owners from misdirected claims — and ensures the community does not overlook a ten-year cover it may be entitled to without realising it.

What the LOE is and why it regulates this insurance

Law 38/1999, of 5 November, on Building Standards (LOE) sets out the framework of liability for every agent involved in constructing a building in Spain: the developer, the architect/designer, the builder, the site supervisor and quality-control bodies. Article 17 LOE establishes three separate warranty periods depending on the severity of the damage: one year for material damage from execution defects affecting finishing elements; three years for damage affecting habitability (damp, breaches of health and safety conditions); and ten years for material damage caused by defects affecting the foundations, structural supports, beams, floor slabs, load-bearing walls or other structural elements that directly compromise the building's mechanical resistance and stability. It is this last period that gives the seguro decenal its name.

When is the ten-year insurance mandatory?

Article 19.1.c LOE requires the developer to take out material-damage insurance (or, alternatively, a bond/guarantee) covering, for ten years, compensation for damage originating in or affecting structural elements, for every building whose principal purpose is residential housing. In practice, this means the seguro decenal is mandatory for new-build residential developments — whether apartment blocks under horizontal property or standalone houses — regardless of whether the property is a first or second home.

The LOE sets out two relevant exceptions within Article 19.1.c itself:

• Self-developers building their own single-family home for personal use: when an individual builds their own detached house purely for personal use, without intent to sell, the law allows the mandatory ten-year insurance to be replaced by an alternative guarantee — but only for as long as the property is not transferred before the ten years from handover elapse; if it is sold sooner, the seller must take out the seguro decenal at the point of sale.
• Buildings for uses other than housing (offices, commercial premises, industrial units): the seguro decenal required under Article 19.1.c LOE is not legally mandatory, although a developer may take it out voluntarily; the liability periods under Article 17 LOE against the developer and other agents still apply regardless.

For a foreign buyer, the practical takeaway is straightforward: if the property is part of a residential development delivered by a professional developer, the ten-year insurance should have existed from the point the first-occupancy licence was granted, and it remains valid for the full ten years regardless of ownership changes, because the cover protects the building itself and transfers automatically to whoever owns the property.

What exactly does the ten-year insurance cover?

The seguro decenal covers only damage that compromises the building's mechanical resistance and stability: structural cracking in columns, beams or floor slabs, differential settlement of the foundations, structural deformation that endangers the building's safety. It does not cover surface cracking in render or finishes, condensation damp, finishing defects, or faults in installations — those fall, where applicable, under the one- or three-year periods of Article 17 LOE, which are typically not backed by a mandatory insurance policy but by the direct liability of the building agents (builder, site supervisor) toward the developer or owners.

It is also important to distinguish who is protected: the seguro decenal protects successive owners against a structural failure in the building as originally constructed by the developer. It does not cover damage arising from the community's own lack of maintenance, nor works carried out after handover that alter the structure — a renovation that removes a load-bearing wall without a technical project, for example, falls outside the ten-year cover and creates liability for whoever carried it out.

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What happens if the developer never took out the ten-year insurance?

Failing to comply with the insurance requirement under Article 19.1.c LOE does not release the developer from its ten-year structural liability toward owners under Article 17.1.c LOE: the developer remains directly liable for structural damage for ten years regardless of whether a policy exists. The practical difference matters, because without insurance the community must litigate directly against the developer (and, where relevant, against the builder, designer and site supervisor according to their role in the defect) rather than claim against a solvent insurer. Failure to take out the mandatory policy can also amount to an administrative infringement under regional housing regulations, without prejudice to the developer's direct civil liability.

This is why it is worth requesting a copy of the seguro decenal policy — together with the building's technical logbook (libro del edificio, required under Article 7 LOE) — either when the community is first constituted or when a professional administrator takes over management of a new-build property. For foreign owners buying resale within the first ten years of a building's life, asking the seller or agent for this documentation before completion is a straightforward way to confirm the cover still exists and transfers with the sale.

Frequently asked questions

Does the ten-year insurance cover cracks in non-load-bearing walls?

No, unless those cracks are a symptom of an underlying structural problem. The seguro decenal only covers damage compromising the building's mechanical resistance and stability (Art. 19.1.c LOE): foundations, structural supports, beams, floor slabs and load-bearing walls. Surface cracking in a non-structural partition wall would, at most, fall under the one-year warranty for finishing defects (Art. 17.1.a LOE), which will already have expired in a building more than a year old.

Who should keep the ten-year insurance policy, the developer or the community?

The policy should be delivered together with the building's technical documentation and kept in the building's logbook (libro del edificio, Art. 7 LOE), for which the property owner — in practice, the community of owners or its administrator — is responsible. It's worth requesting a copy of the decenal policy when the community is first set up or when a professional administrator takes over a new-build property, precisely so it can be shown to the insurer if a structural claim arises years later.

Can the community's ordinary insurance substitute for the ten-year insurance?

No. They are independent policies with different purposes, policyholders and durations. The community policy covers ordinary day-to-day risks (fire, water, civil liability) and is contracted year by year by the assembly of owners; the seguro decenal covers exclusively structural damage during the ten years following handover and is contracted by the developer. Neither replaces the other, and in practice both typically coexist without overlapping cover.

What if the building is commercial or office space rather than housing?

Article 19.1.c LOE limits the mandatory ten-year insurance to buildings whose principal purpose is residential. For buildings used differently (offices, commercial premises, industrial units), the seguro decenal is not legally required, although a developer may take it out voluntarily. In any case, the liability periods under Article 17 LOE against the developer and other building agents still apply, whether or not a policy exists.

When does the ten-year period start counting?

From the date the developer formally receives the completed building (recepción de la obra), typically documented in a handover record between developer and builder (Art. 6 LOE) — not from the date an individual owner completes their purchase, and not from the date of the final works certificate if that differs from formal handover. This is why it matters for a property administrator to keep this date on file, usually recorded in the building's logbook, in order to accurately assess whether a structural defect discovered later still falls within cover.

Can an individual owner claim directly, or must the community do so?

It depends on whether the damage affects private or communal elements. If the structural crack affects a common element (foundations, a floor slab spanning several properties, a shared load-bearing wall), standing to claim belongs to the community of owners, represented by its president under Article 13.3 LPH. If the structural damage affects exclusively a private element within a single property, the individual owner may claim directly under the LOE, though it's worth coordinating with the property administrator if the underlying defect is common to the whole building.