The seguro decenal in Spain: the 10-year structural warranty insurance for new-build property (2026)

The seguro decenal in Spain: the 10-year structural warranty insurance for new-build property (2026)

The seguro decenal is a mandatory insurance policy, not a legal abstraction. Article 19.1.c of Ley 38/1999, the Ley de Ordenacion de la Edificacion (LOE), requires every developer of a residential building in Spain to purchase a ten-year structural damage insurance policy before a notary will sign the deed. The policy covers material damage to the building’s structural elements caused by construction defects, for a full decade from formal handover. The minimum insured capital is 100 per cent of the construction cost plus professional fees, the developer is the policyholder, and the cover follows the property through every subsequent sale. This guide explains what the product covers, who pays for it, how the claim mechanism works, and how it differs from the bank guarantee that protects your money during construction.

What is the seguro decenal and who must buy it?

The seguro decenal (literally “ten-year insurance”) is the mandatory structural damage policy that Article 19.1.c of the LOE requires for every residential new-build in Spain. It covers material damage caused by defects in the foundation, supports, beams, floor slabs, load-bearing walls and other structural elements that directly compromise the mechanical resistance and stability of the building, for ten years from the date of formal handover (recepcion).

The policyholder (tomador del seguro) is the developer (promotor), who must purchase the policy before the notary signs the deed of the new building. The insured parties (asegurados) are the developer and every subsequent buyer of the building or any part of it, as stated in Article 19.2. This means the seguro decenal follows the property, not the original purchaser. If you buy a four-year-old apartment from the first owner, the remaining six years of structural cover transfer to you automatically. You do not need to arrange a new policy or pay a new premium.

The Disposicion Adicional Segunda of the LOE makes the seguro decenal obligatory for all buildings whose principal use is residential, from the date the law entered into force (6 May 2000). The only exemption is the autopromotor who builds a single-family home for personal use, but even that owner must take out the insurance before selling the property within the ten-year window, unless the buyer expressly waives the requirement in writing. For every developer-led residential project, there is no exemption, no opt-out and no cash-retention substitute.

What does the seguro decenal cover and what does it exclude?

The seguro decenal covers a specific class of defect: structural. Article 17.1.a of the LOE defines the ten-year liability window as covering “material damage caused in the building by defects that affect the foundation, supports, beams, floor slabs, load-bearing walls or other structural elements, and that directly compromise the mechanical resistance and stability of the building.” This is the test the insurer applies when a claim is filed.

The LOE actually sets three distinct warranty periods, each with a different scope and minimum insured capital, as set out in Article 19.1:

Warranty period	What it covers	Who is liable	Minimum insured capital
1 year (Article 17, final paragraph)	Defects in finishing and appearance (elements de terminacion o acabado): paintwork, tiling, doors, fittings	The contractor (constructor) directly	5 per cent of the construction cost
3 years (Article 17.1.b)	Defects in construction elements or installations that breach habitability: waterproofing, plumbing, wiring, insulation, ventilation, noise protection	All building agents; the developer always solidarily	30 per cent of the construction cost
10 years (Article 17.1.a, the seguro decenal)	Structural defects in the foundation, supports, beams, floor slabs, load-bearing walls that compromise mechanical resistance and stability	All building agents; the developer always solidarily	100 per cent of the construction cost

The seguro decenal is the third row only. The one-year and three-year warranties are separate guarantees under the same Article 19 regime, but the seguro decenal is the one that is mandatory without exception for residential buildings, the one with the highest minimum capital, and the one the notary checks before signing the deed.

Article 19.9 sets out what the insurance does not cover, unless the policy agrees otherwise:

Exclusion	What it means
Bodily injury or other economic loss	The policy pays for the cracked foundation, not for injuries or lost rental income
Damage to adjacent properties	A foundation failure that cracks the neighbour’s wall is excluded
Damage to movable goods	Furniture and personal belongings inside the building are not covered
Post-handover modifications	Damage from works carried out after the recepcion is excluded, unless the works fix a defect listed in the handover acta
Misuse or poor maintenance	The insurance is not a substitute for the maintenance schedule in the Libro del Edificio
Fire or explosion	Unless caused by a defect in the building’s own installations
Force majeure, third-party acts, self-inflicted damage	Standard insurance exclusions
Parts with reservations in the acta	Damage to items listed as reservations in the handover acta is not covered until fixed and confirmed in a new signed acta

The exclusions explain why the snagging guide stresses the handover acta. Every defect the buyer accepts without listing it as a reservation is a defect the insurer can later argue was the buyer’s own use, not a construction fault.

How does the seguro decenal work as an insurance product?

The seguro decenal is a real insurance contract with specific structural features that the LOE mandates. The policyholder is the developer, the premium must be paid at the moment of handover, and the insurer cannot cancel the policy before the ten-year term ends (Article 19.4). The policy is irrevocable once it takes effect, which is a deliberate consumer protection: a developer cannot let the policy lapse in year three to save money.

The minimum insured capital is 100 per cent of the final construction cost (coste de ejecucion material) plus professional fees, as set by Article 19.5.c. This is the highest minimum in the LOE regime, reflecting the severity of structural failures. The insurer can settle a claim either by paying cash compensation (indemnizacion en metalico) based on the assessed damage, or by repairing the defect directly (Article 19.6). For the surety bond variant (seguro de caucion), the insurer must indemnify on first demand and cannot raise defences it might have against the developer (Article 19.3).

The premium itself is not a fixed statutory rate. It is set by the insurance market, based on the risk profile of the project. Insurers price the seguro decenal according to the building type, location, structural complexity, the number of units, the construction budget and the findings of an Organismo de Control Tecnico (OCT), an independent technical body that audits the project on behalf of the insurer. The OCT reviews the structural project, inspects the construction at key stages and verifies compliance with the Codigo Tecnico de la Edificacion (CTE, approved by Real Decreto 314/2006). Most insurers will not issue a seguro decenal policy without an OCT report, which means the insurance mechanism also enforces a quality-control audit on the construction itself.

The policyholder cannot introduce a franchise (deductible) on the one-year finishing guarantee (Article 19.8), and any franchise on the three-year and ten-year guarantees is capped at 1 per cent of the insured capital per registered unit (Article 19.8, second paragraph). This keeps the seguro decenal from becoming a paper guarantee with a gap the buyer cannot bridge.

How is the seguro decenal enforced at the notary?

Article 20 of the LOE is the enforcement mechanism that makes the seguro decenal unavoidable. It has two paragraphs and they are direct: no notary may authorise the escritura publica of a declaracion de obra nueva (the public deed that registers a new building) without seeing and testifying to the constitution of the Article 19 guarantees, and the Land Registry will not inscribe the deed without that proof.

In practice, the notary checks the insurance certificates before the signing appointment. If the developer cannot produce the seguro decenal policy, the notary refuses to sign. The building cannot enter the Land Registry, the buyer cannot register title, and utility companies will not connect permanent supplies. The same enforcement applies to the Registro Mercantil: the developer’s corporate registration cannot be closed or liquidated while the LOE warranty periods are open, unless the developer proves the guarantees are in place for every building it has promoted (Article 20.2).

This is why the off-plan buying mechanics guide tells buyers to demand the Libro del Edificio at handover. The Libro del Edificio, required by Article 7 of the LOE, contains the insurance policies, the construction details and the maintenance schedule. The seguro decenal certificate inside it is not marketing material; it is the proof the notary needed to sign the deed. A buyer who accepts keys without reviewing the Libro del Edificio is accepting a property whose warranty proof they have never seen.

How does the seguro decenal differ from the bank guarantee?

The seguro decenal and the bank guarantee protect different things at different stages, and a new-build buyer needs both. The confusion between them is the most common question buyers raise at the notary.

Feature	Seguro decenal (LOE Article 19)	Bank guarantee (Ley 57/1968, consolidated into LOE Disposicion Adicional Primera, amended by Ley 20/2015)
What it protects	Construction defects after delivery	Advance payments during construction
When it applies	From formal handover for 10 years (structural), 3 years (habitability), 1 year (finishing)	From reservation to the escritura
Who must hold it	The developer, before the notary signs the deed	The developer, before accepting any advance payment
What the buyer recovers	Repair or cash compensation for the structural defect	Full advance plus legal interest if the developer fails to deliver
Enforcement	Notary refuses the deed without it (Article 20)	Bank or insurer pays on demand; funds held in a separate cuenta especial

The bank guarantee, explained in detail in the off-plan buying mechanics guide, is the protection for the money the buyer pays before the building exists. If the developer becomes insolvent mid-construction, the bank or insurer repays the advance plus interest. The seguro decenal is the protection for the building after it is delivered. If a structural crack appears in year six, the insurer repairs it or pays. The two run in sequence, not in competition: the bank guarantee covers the construction phase, the seguro decenal covers the post-completion phase. A buyer who holds a bank guarantee but never checks the seguro decenal at handover is protected against developer insolvency but not against a defective foundation.

The Ley 20/2015 reform strengthened the bank guarantee regime by replacing the old generic surety with individual per-buyer policies (Disposicion Adicional Primera, section Dos.1.a), each identifying the specific property and the amounts advanced. This closed a gap where a developer could hold a single group policy that left individual buyers without a directly enforceable right. The seguro decenal, by contrast, has always been a per-building policy that runs with the property.

What happens if the developer goes bust after handover?

The seguro decenal is specifically designed to survive developer insolvency. Because the policy is an insurance contract between the insurer and the developer, with the buyer as a named insured party, the buyer’s claim runs directly against the insurer. If the developer has disappeared, the buyer does not need to pursue a liquidation proceeding or wait for a creditor queue. The insurer is obliged to respond to the claim on first demand, and for the surety bond variant it cannot raise defences it might have had against the developer (Article 19.3).

The developer’s solidary liability (Article 17.3) means the developer is liable alongside every other agent in the building process, but the insurer is the party with the balance sheet and the obligation to pay. The developer’s absence does not break the chain. The property insurance guide covers the broader insurance stack a non-resident owner should hold, but the seguro decenal is the one layer that the law forces onto the developer before the buyer ever takes possession.

If the insurer itself fails, the buyer is protected by the Insurance Compensation Consortium (Consorcio de Compensacion de Seguros), the state-backed body that covers claims against insolvent insurers in Spain. This is a backstop that the buyer does not need to arrange or pay for, but it is worth knowing it exists.

How does a buyer claim under the seguro decenal?

The claim path runs through the developer first, then the insurer. The buyer documents the defect with photographs and a written notice (notificacion) to the developer within the relevant warranty window. If the developer does not respond within a reasonable period, the buyer instructs an independent lawyer to file a formal claim (reclamacion) against the insurer that issued the Article 19 policy.

The prescription deadline is two years from the date the damage appears, not from the handover date (Article 18.1). This is a critical distinction. A structural crack that surfaces in year seven of the ten-year window gives the buyer two years to file, but only if the crack falls within the ten-year structural period that began at formal receipt. A habitability defect that appears in year two of the three-year window gives the same two years. The clock starts when the damage becomes apparent, not when the keys changed hands.

The two-year prescription period can be interrupted by a judicial or extrajudicial claim to the responsible agents, which resets the clock. This is why the common mistakes guide advises buyers to document and notify defects immediately, in writing, rather than waiting to see if the crack grows. The seguro decenal is a powerful protection, but only for the buyer who activates it within the window.

The LOE liability runs alongside the buyer’s separate rights against the seller for hidden defects (vicios ocultos) under Articles 1484 and following of the Spanish Civil Code, a parallel track that does not depend on the insurance policy at all. A buyer who suspects a hidden defect should consult an independent lawyer promptly, because waiting weakens the causal link between the defect and the construction.

What should a buyer check at handover?

The buyer’s defensive move at handover is to verify that the seguro decenal policy exists, is current, and names the property. The buying property as a foreigner guide sets out the full purchase process, but at the handover stage the seguro decenal checks are specific:

1. Ask for the Libro del Edificio, the building book required by Article 7 of the LOE. It must contain the seguro decenal policy certificate, the one-year guarantee certificate (or proof of the 5 per cent retention), and the three-year habitability guarantee if the developer has taken it out (the Disposicion Adicional Segunda makes the seguro decenal mandatory from the start but allows the three-year and one-year guarantees to be phased in by Real Decreto).
2. Check that the seguro decenal policy names the building, not just the developer. The insured parties are the developer and every subsequent buyer (Article 19.2), and the policy must identify the property.
3. Note the recepcion date on the handover acta. All three warranty windows run from that date (Article 6.5), and the ten-year seguro decenal window is no exception.
4. List every visible defect as a reservation in the acta. Defects listed as reservations are not covered until they are fixed and confirmed in a new signed acta (Article 19.9.i), but listing them preserves the buyer’s position. Defects not listed are the ones the insurer can later argue were accepted or caused by the buyer.

This guide is general information, not legal or tax advice. Rules change and individual circumstances differ. Verify current requirements with an independent lawyer (abogado) or tax advisor (gestor/asesor fiscal) before acting.