Building defects and developer liability in Spain: LOE warranties, seguro decenal and RDL 7/2021 conformity rights explained (2026)

When a newly built Spanish property develops cracks, leaks or structural faults, the buyer is not left to a private warranty from a developer that may have dissolved by the time the problem appears. Spanish law provides a layered system of mandatory liability and insurance that runs for up to ten years from handover, backed by a consumer conformity regime that gives the buyer an enforceable remedy ladder. The two frameworks work in parallel: the LOE (Ley 38/1999 de Ordenacion de la Edificacion) governs the liability of every construction agent, and RDL 7/2021 (transposing EU Directive 2019/771) gives consumers a statutory right to repair, price reduction or contract resolution for non-conforming goods.

What are the three LOE liability tiers for building defects in Spain?

The LOE, in force since 6 May 2000, establishes three distinct liability periods that run from the acta de recepcion, the formal handover document signed by the promoter and constructor. Each tier covers a different category of defect and binds different agents.

LOE tier	Period	What it covers	Who is liable	Guarantee mechanism
Finishing defects	1 year	Vicios o defectos de ejecucion affecting elements of terminacion o acabado	Constructor only	Seguro de danos materiales, seguro de caucion or 5 per cent retention by promoter
Habitability defects	3 years	Vicios o defectos of construction elements or installations causing failure of habitability requirements (Art 3.1.c: hygiene, noise, energy, functional use)	All agents (promoter, proyectista, constructor, directors)	Seguro de danos materiales, seguro de caucion or financial guarantee
Structural defects	10 years	Vicios o defectos affecting foundation, supports, beams, slabs, load-bearing walls or other structural elements compromising mechanical resistance and stability	All agents	Seguro decenal (mandatory for residential)

The one-year tier is the constructor’s alone: the LOE Article 17.1.b second paragraph specifies that “the constructor will also respond for material damage caused by execution vices or defects affecting elements of termination or finishing of the works within the one-year period.” The three-year and ten-year tiers bind every agent who intervened in the process, from the promoter to the director of execution, as Article 17.2 establishes personal and individualised liability. When the cause cannot be individualised, Article 17.3 imposes solidaria (joint and several) liability, and the promoter always responds solidarily with all other agents before any future buyer.

What is the seguro decenal and when is it mandatory?

The seguro decenal, formally the ten-year seguro de danos materiales under LOE Article 19.1.c, is a mandatory insurance policy covering structural defects for ten years from handover. It is required for every building whose primary use is residential, per the Disposicion Adicional Segunda of the LOE, which made the decenal guarantee immediately exigible upon the law’s entry into force. The policy must be subscribed by the promoter before the first-occupation licence is issued, and Article 20 of the LOE requires evidence of the insurance for the escrituracion (notarial deed) and Land Registry inscription.

The seguro decenal covers the cost of repairing structural damage, including demolition and debris removal costs, caused by vices or defects originating in or affecting the foundation, supports, beams, slabs, load-bearing walls or other structural elements that directly compromise the mechanical resistance and stability of the building. It does not cover finishing defects (cosmetic cracks, paint failures, tile issues) or habitability defects (dampness from poor sealing, ventilation failures) unless those defects compromise structural integrity. The policy carries no franchise for the one-year guarantee and a maximum 1 per cent franchise for the three-year and ten-year guarantees, per LOE Article 19.

The practical value of the seguro decenal is that it is an insurance contract independent of the developer’s solvency. If the developer has dissolved by year seven when a foundation crack appears, the buyer claims directly against the insurer. The three-year and one-year guarantees (seguro trienal and anual) have not been made mandatory by Royal Decree, so the developer’s retention of 5 per cent of the construction cost under LOE Article 19.1.a is the fallback for the one-year tier.

How does RDL 7/2021 change the buyer’s remedies for defects?

RDL 7/2021, published 28 April 2021 and effective from 1 January 2022, transposed EU Directive 2019/771 into the TRLCU (Real Decreto Legislativo 1/2007), rewriting Articles 114 to 126. For consumer sales, which include the purchase of a newly built property from a developer, this regime gives the buyer a statutory remedy ladder that sits alongside the LOE.

Under TRLCU Article 117, the business is liable for any lack of conformity existing at the moment of delivery. The consumer can demand, by a simple declaration, the sub-sanacion (remedy) of the defect, a price reduction or contract resolution. TRLCU Article 118 sets the remedy hierarchy: the consumer chooses between repair or replacement, unless one is impossible or disproportionately costly for the business. If the business cannot or will not put the good in conformity, TRLCU Article 119 allows the consumer to claim a proportional price reduction (Art 119 bis) or contract resolution (Art 119 ter).

The key consumer protections are:

• Free of charge: TRLCU Article 118.4.a requires the remedy to be free for the consumer, including shipping, transport, labour and materials.
• Reasonable time: Article 118.4.b requires the remedy within a reasonable time of the business being informed.
• Three-year responsibility period: TRLCU Article 120.1 gives the business three years’ responsibility for conformity defects that exist at delivery and manifest within three years (two years for digital content). For second-hand goods, the parties may agree a shorter period but not below one year.
• Burden of proof presumption: TRLCU Article 121.1 presumes that defects manifesting within two years of delivery already existed at handover, shifting the burden to the business to prove otherwise.
• 14-day refund: TRLCU Article 119 quater requires any refund for price reduction or resolution within 14 days, using the same payment method, at no cost to the consumer.

The interaction with the LOE matters: TRLCU Article 116 declares that the conformity actions are incompatible with the Civil Code saneamiento (hidden defects) actions, so the buyer chooses one route. The LOE route is usually stronger for structural defects because it carries the seguro decenal backing and a longer ten-year period; the TRLCU route is stronger for finishing and habitability defects because it gives a clean remedy ladder and a burden-of-proof presumption in the buyer’s favour.

How does the prescription clock work for building defect claims?

LOE Article 18 sets a two-year prescription period for liability actions, counted from when the damage materialises, not from handover. This is a critical distinction: a structural crack appearing in year eight of the decenal period triggers a two-year window to file, expiring in year ten. If the buyer misses that window, the claim is prescribed even though the decenal insurance is still nominally in force.

The accion de repeticion, the cross-claim between agents or insurers, also prescribes in two years from the firm judicial resolution or the date of extrajudicial indemnification (Article 18.2). TRLCU Article 122 adds that the conformity remedy periods suspend while the business is carrying out repair or replacement, and the business remains liable for the same defect for one year after the remedied good is returned.

The practical implication is documentation. A buyer who spots a crack, a damp patch or a door that will not close should photograph it, notify the developer or insurer in writing (burofax with acknowledgement is standard practice) and obtain a technical report from an arquitecto tecnico within the two-year prescription window. The snagging survey at handover, covered in our snagging a new build on the Costa del Sol guide, is the first line of evidence for the one-year tier. For defects appearing later, the same evidentiary discipline applies within the relevant LOE period.

What is the difference between snagging and a building defect?

Snagging covers cosmetic and finishing defects identified at or shortly after handover: a misaligned tile, a scratch on a window, a tap that drips. These fall within the LOE one-year tier and are typically resolved through the developer’s post-sale remediation process, documented in a snagging list. Our guide to the obra nueva process and building control explains the handover and first-occupation certificate sequence.

A building defect, by contrast, is a material fault that affects habitability or structural integrity and manifests after handover. A damp problem caused by a failed damp-proof course is a habitability defect under the three-year tier. A foundation settlement crack is a structural defect under the ten-year tier. The distinction matters because the remedy, the liable agent and the insurance mechanism differ by tier. Snagging is a contractual matter between buyer and developer; a building defect claim may involve the seguro decenal insurer, the architect, the constructor and the promoter jointly.

What should a buyer check before completion to protect against defects?

The buyer’s due diligence before signing the escritura should verify that the seguro decenal is in place and that its certificate names the correct building. The off-plan buying mechanics guide covers the bank guarantee and stage payment protections that precede handover. At handover, the buyer should commission an independent snagging survey, retain the acta de recepcion and the Libro del Edificio (the building manual containing the project, maintenance instructions and insurance certificates), and photograph every defect before accepting keys.

For the three-year and ten-year tiers, the buyer should preserve all correspondence with the developer and insurer, keep the seguro decenal policy reference, and diary the two-year prescription window from any later defect discovery. If the developer becomes insolvent, the seguro decenal insurer remains the primary claim target; our guide on off-plan developer insolvency explains the recovery route. The consumer protection for property buyers guide covers the broader Ley 26/1984 and abusive clause framework that overlays these specific construction liability rules.

What happens if the developer refuses to fix a defect?

If the developer does not carry out the repair or replacement within a reasonable time, TRLCU Article 119 lets the consumer escalate to a price reduction or contract resolution. For LOE claims, the buyer files a judicial action against the developer and any other liable agents within the two-year prescription period, naming the seguro decenal insurer if the defect is structural. The promoter’s solidaria liability under LOE Article 17.3 means the buyer can claim against the promoter alone and recover the full amount, leaving the promoter to pursue its cross-claim against the responsible agent.

The Spanish courts have refined the solidaria liability rule: STS 20 May 2015 (Rec 2167/2012) established that while the liability is solidaria in nature, it is determined by the judicial sentence that declares it, so claiming against the promoter alone does not interrupt the prescription period against other agents. This makes it advisable to name all identifiable agents in the claim to preserve the prescription clock against each.