Construction liability insurance in Spain: RC obras, the seguro decenal distinction and what you need during building work (2026)

Construction liability insurance in Spain: RC obras, the seguro decenal distinction and what you need during building work (2026)

Construction liability insurance in Spain is not a single product but a stack of complementary policies, each covering a different stage and a different risk. The seguro de responsabilidad civil de obra (RC obras) covers third-party claims during the construction phase. The seguro decenal, mandated by Article 19 of Ley 38/1999 (the Ley de Ordenacion de la Edificacion, or LOE), covers structural defects for ten years after completion. The seguro todo riesgo construccion (TRC) covers damage to the work in progress itself. A property owner planning building work needs to understand which of these are mandatory, which are voluntary but essential, and how they interact, because gaps between them are where uninsured losses land.

What is the RC obras and who needs it?

The RC obras (seguro de responsabilidad civil de obra) is a liability policy that covers third-party claims arising during the construction phase. If a passer-by is injured by falling debris, if your foundation work cracks a neighbour’s wall, or if a worker liability claim arises, the RC obras responds. It covers material damage, bodily injury and consequential economic loss caused to third parties by the construction activity itself.

The RC obras is not the same as the seguro decenal. The decenal covers defects in the completed building for a decade after handover. The RC obras covers harm caused by the construction process while it is underway. The two run in sequence: the RC obras protects during the build, the decenal protects after it. A project needs both because they address entirely different risks.

Under the LOE framework, liability for construction defects is allocated across the agents who participate in the building process. Article 17.2 of Ley 38/1999 establishes that this liability is personal and individualised: each agent answers for their own acts or omissions. Article 17.3 states that liability becomes solidaria (joint and several) only when the cause of the damage cannot be individualised or when there is concurrence of faults without the degree of each agent’s intervention being determinable. The promotor is the single agent who always responds solidariamente with every other agent, regardless of fault allocation.

This liability framework is why the RC obras exists. It is the financial instrument that makes Article 17 liability practically enforceable. Without it, a contractor facing a third-party claim would pay out of pocket, and a passer-by injured on site might recover only through years of litigation against an insolvent builder. The property insurance guide covers the broader insurance stack a non-resident owner should hold, but the RC obras is the construction-specific layer.

Is the RC obras mandatory under Spanish law?

The RC obras occupies a middle ground between statutory mandate and practical necessity. There is no single article of the LOE that makes a general construction liability policy mandatory for every project in the way Article 19 makes the seguro decenal mandatory for residential new-builds. The LOE establishes the liability framework (Article 17) and the warranty guarantees (Article 19), but the construction-phase liability insurance is driven by three separate mechanisms.

First, many municipalities require proof of a construction liability policy as a condition of issuing the building licence (licencia de obras). The refurbishment permits guide explains the licence process in detail, but the insurance requirement is a common condition: the town hall will not release the licencia de obra mayor until the applicant demonstrates that construction-phase liability cover is in place. This is a municipal, not a national, requirement, so the exact threshold and coverage minimum varies by municipality.

Second, the collective agreements (convenios colectivos) in the Spanish construction sector typically require contractors to maintain liability cover as a condition of operating. The main sectoral agreement sets minimum coverage levels that bind employers in the sector, and most public procurement pliegos (tender specifications) require the same.

Third, every developer and private client who understands the LOE liability framework demands it contractually. If a contractor causes damage to a neighbouring property and has no insurance, the liability falls on the contractor personally under Article 17.2, and on the promotor solidariamente under Article 17.3. A sensible promotor refuses to engage a contractor without RC cover, because the alternative is absorbing the contractor’s liability exposure.

What does the LOE Article 17 liability framework cover?

Article 17 of Ley 38/1999 is the statutory backbone of construction liability in Spain. It allocates liability across the agents of the building process and sets three distinct warranty periods, each tied to a class of defect.

Period	What it covers	Who is liable	Minimum insured capital (Art 19)
1 year	Finishing and appearance defects (elements de terminacion o acabado)	The contractor (constructor) directly	5 per cent of construction cost
3 years	Habitability defects: waterproofing, plumbing, wiring, insulation, ventilation, noise protection	All building agents; promotor always solidariamente	30 per cent of construction cost
10 years	Structural defects: foundation, supports, beams, floor slabs, load-bearing walls compromising mechanical resistance and stability	All building agents; promotor always solidariamente	100 per cent of construction cost

Article 17.2 establishes the core principle: liability is personal and individualised. Each agent answers for their own acts and omissions. This is the default. Article 17.3 creates the exception: when the cause cannot be individualised, or when there is concurrence of faults without the degree of each agent’s intervention being determinable, liability becomes joint and several. The promotor is the only agent who always responds solidariamente, regardless of whether their own fault can be established.

This structure matters for insurance because it determines who the claimant pursues and who the insurer covers. A buyer who discovers a structural defect in year six can claim against any agent under the solidaria regime, but in practice the claim runs against the insurer that issued the seguro decenal, because the insurer has the balance sheet and the obligation to pay. The seguro decenal guide covers the decenal mechanism in full detail.

How does the seguro decenal differ from the RC obras?

The seguro decenal and the RC obras are the two policies most commonly confused, yet they protect at different stages against different risks. The distinction is the single most important thing a property owner needs to understand before commissioning building work.

Feature	RC obras (construction liability)	Seguro decenal (LOE Article 19)
What it covers	Third-party claims during construction: injuries, neighbouring property damage, worker liability	Structural defects in the completed building for 10 years from handover
When it applies	During the construction phase, from start to handover	From formal handover (recepcion) for 10 years
Who holds it	The contractor or developer, depending on contract	The promotor (developer), before the notary signs the deed
Legal basis	LOE Article 17 liability framework, municipal licence conditions, convenios colectivos	LOE Article 19, mandatory for residential buildings
Enforcement	Municipal licence refusal, contractual requirement	Notary refuses the deed without it (Article 20)
Minimum capital	Set by market and municipal requirements	100 per cent of construction cost (Article 19.5.c)

The seguro decenal is the one the law makes unavoidable. Article 20 of the LOE blocks the notary from authorising the escritura publica of a declaracion de obra nueva without proof that the Article 19 guarantees are in place, and the Land Registry will not inscribe the deed without that proof. The RC obras has no equivalent national enforcement mechanism, but the municipal licence requirement achieves a similar practical effect for most projects.

What is the seguro todo riesgo construccion (TRC)?

The seguro todo riesgo construccion (TRC), also known as Construction All Risks (CAR), is a property damage policy that covers the work in progress itself. If a fire destroys the partially built structure, if thieves steal copper wiring and tools from the site, if a storm damages the exposed roof before it is sealed, or if a partial collapse occurs during excavation, the TRC responds.

The TRC covers the period from the first day of construction to provisional handover. It fills the temporal gap before the seguro decenal takes effect: the decenal covers the completed building, the TRC covers the building while it is being built. The two are complementary, not substitutes.

Typical TRC coverage runs to 100 to 120 per cent of the project value, accounting for the cost of removing debris and the inflated cost of emergency repairs. It is commonly combined with a cross-liability extension (RC cruzada) that covers the contractor, subcontractors and the promotor against claims between them and from third parties during the build.

Which insurance does a property owner need at each stage?

A property owner commissioning building work in Spain faces different insurance requirements at each stage of the project. The building and renovation cost guide covers the cost framework, but the insurance stack runs parallel to it.

Stage	Insurance needed	Who arranges it	Why
Pre-construction (licence application)	RC obras (municipal requirement in most jurisdictions)	The contractor or developer	Town hall will not issue the licencia de obra mayor without proof of liability cover
Pre-construction (new-build only)	Seguro decenal	The promotor	Notary will not sign the deed of a new residential building without it (Article 20); the insurer requires an OCT audit of the structural project before issuing the policy
During construction	TRC (todo riesgo construccion)	The promotor or contractor	Covers damage to the work itself: fire, theft, storm, partial collapse
During construction	RC obras	The contractor	Covers third-party claims: injuries, neighbouring property damage, worker liability
At handover (new-build)	Seguro decenal takes effect	Already in place	Covers structural defects for 10 years from recepcion
Post-completion	Community insurance (LPH Article 10)	The comunidad de propietarios	Covers damage to the building and common elements once the community is constituted

The seguro decenal premium is set by the insurance market, not by statute. Insurers price it 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). The premium typically ranges between 0.9 and 1.6 per cent of the construction cost for standard residential new-builds.

How does the LPH community insurance interact?

Once a building is completed and the units are sold, the comunidad de propietarios assumes responsibility for insuring the building and its common elements. Article 10 of Ley 49/1960 (the Ley de Propiedad Horizontal, or LPH) requires the community to maintain a reserve fund (fondo de reserva) and permits it to subscribe to an insurance contract covering damage to the building (seguro que cubra los danos causados en la finca) from that fund.

This community insurance is distinct from the seguro decenal. The decenal covers structural defects traced to the original construction for ten years. The community insurance covers ongoing risks to the building and common elements: fire, water damage, storm damage, liability for injuries in common areas. The community fees guide explains the reserve fund mechanism, and the LPH itself is covered in detail in the LPH guide.

The interaction matters during the first ten years of a new building’s life. A structural defect that appears in year four is covered by the seguro decenal (the developer’s policy, which follows the property). A fire in the common area in year four is covered by the community insurance. The two policies do not overlap: one is a construction-defect warranty that runs with the property, the other is an ongoing property insurance held by the community.

What about the autopromotor?

An autopromotor (a person building a single-family home for personal use, not for sale) has a specific position under the LOE. The Disposicion Adicional Segunda, section Uno, of Ley 38/1999 provides that the ten-year structural guarantee (seguro decenal) is mandatory for buildings whose principal use is residential, with a specific exemption for the autopromotor individual de una unica vivienda unifamiliar para uso propio. The autopromotor may renounce the seguro decenal by declaring so expressly before a notary in the escritura de obra nueva. This is the only exemption from the mandatory decenal for residential buildings.

The exemption is narrower than it appears. If the autopromotor sells the property within the ten-year window, the LOE requires the insurance to be in place before the sale, or the autopromotor assumes the structural liability directly against the buyer. In practice, most autopromotores who intend to sell within a decade take out the decenal anyway, because the alternative is personal exposure to a structural defect claim under Article 17 with no insurer behind them.

The RC obras and TRC are not affected by the autopromotor exemption. The construction-phase risks (third-party injury, neighbouring property damage, damage to the work in progress) exist regardless of whether the building is for personal use or for sale. An autopromotor who waives the decenal but builds without RC obras or TRC is absorbing the full construction-phase risk personally.

How does the RC obras relate to neighbour damage claims?

The neighbour construction damage guide covers the specific scenario where a neighbour’s building work damages your property. The RC obras is the policy that responds when the damage flows in the other direction: when your construction work damages a neighbour’s property.

Article 17.2 of the LOE makes the agent who caused the damage individually liable. In practice, the claimant pursues the party with insurance, which is the contractor holding the RC obras. If the contractor has no RC cover, the claimant pursues the promotor under the solidaria regime of Article 17.3, which is why a promotor who engages an uninsured contractor absorbs the contractor’s liability exposure.

The RC obras typically covers damage to adjacent properties, but the policy terms must be read carefully. The LOE’s own warranty guarantees (Article 19.9.b) explicitly exclude damage to adjacent or adjoining buildings from the seguro decenal. This exclusion is one reason the RC obras exists as a separate policy: the decenal does not cover the scenario where your foundation work cracks the neighbour’s wall, but the RC obras does.

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.