Spain's New-Build Warranties: Ley 38/1999 (LOE) Guide

Quick answer: Spanish new builds carry three warranty tiers under Ley 38/1999 (LOE): 1 year for finishing defects, 3 years for installations and habitability, 10 years for structure, all counted from the reception of the works rather than from your completion date. A mandatory insurance policy, the seguro decenal, stands behind the structural tier and is a precondition for notarising new-home sales. Once damage appears inside its tier, article 18 gives the owner 2 years to act.

What warranty protects a Spanish new build?

Ley 38/1999 de Ordenación de la Edificación, the LOE, is the statute that organises liability for building defects in Spain, and it gives every new home a three-tier shield: 1 year on finishing, 3 years on installations and habitability, 10 years on structure, enforced through liable construction agents and a mandatory insurance layer.

Layer of protection	Instrument	What it is worth to a buyer
Legal liability tiers	LOE arts. 17 and 18	Defined defect classes, defined years, defined defendants
Structural insurance	Seguro decenal	Pays even if the developer no longer exists
Contractor retention	5% customary practice	Money already held against year-1 defects
Snagging process	Pre-handover inspection	Defects fixed before they become claims

Purpose explains the design. The LOE replaced a patchwork of Civil Code case law after decades of dispute over who answered for what and for how long, and it deliberately splits liability by defect type rather than by contract: the buyer’s rights run against the construction agents by law, which is why they survive the developer’s disappearance, the builder’s insolvency and the resale of the flat.

Position in the money chain matters, and one sentence keeps the two regimes straight: Ley 57/1968 bank guarantees protect your money before delivery, and Ley 38/1999 warranties protect your building after it, meeting at the handover where one regime hands off to the other. The handover checklist owns that junction; this page owns everything that ticks after it.

Insider tip: the warranty pack is a purchase document, not a post-completion souvenir. The reception date, the decenal policy and the agents’ identities are all obtainable before you sign, and a developer’s speed in producing them is itself a datapoint in the developer verification you should already be running.

What does each tier cover: 1, 3 and 10 years?

Article 17 LOE draws the three tiers by defect class rather than by contract, and reading a defect into the right tier is the first step of every claim: finishing problems live in year 1, habitability and installations failures anywhere in the first 3 years, and structural damage anywhere inside the full 10 years.

Tier	Covers	Typical examples	Primarily answers
1 year	Finishing and workmanship (acabados)	Paint, doors, tiling lips, silicone, scratched frames	Builder
3 years	Habitability: installations and living conditions	Damp, leaks, plumbing, electrics, heating, insulation failures	Agents solidarily via the developer
10 years	Structural safety	Foundations, beams, load-bearing walls, slabs, cracking with structural cause	Agents + seguro decenal

Boundaries decide cases, so the boundary logic is worth one paragraph. A cracked tile is year 1; water entering through a badly executed terrace membrane is a habitability defect in the 3-year tier; a crack pattern that a technical report traces to differential settlement is 10-year structural regardless of how cosmetic it first looked. The classification follows the cause established by a technician, not the symptom seen by the owner, which is why serious claims begin with an informe pericial rather than a complaint letter.

Exclusions keep expectations honest: wear and tear, owner misuse, unauthorised works and third-party damage sit outside all three tiers, and a defect the buyer knew and accepted at snagging belongs to the snagging process rather than to a later LOE claim. The inspection and the warranty are complements, not substitutes: snagging clears the visible list at day 0, the tiers cover what surfaces afterwards.

Red flag: any developer or administrator describing the 3-year tier as “the appliance warranty”. Installations under the LOE means the building’s systems, and damp is its most litigated word; a leak that ruins a bedroom wall in month 30 is squarely inside the tier, whatever the handover pack’s marketing summary implied.

When does the warranty clock actually start?

Reception of the works is the event that starts every LOE clock: the promoter formally accepts the building from the constructor, documented in the acta de recepción and anchored by the certificado final de obra, and reception routinely lands 2 to 6 months before the first buyer completes, and 14 months before the last one in a slow phase.

• The rule. Tiers count from reception, with the acta signed within 30 days of the final-works certificate in standard practice, and reception deemed tacit in defined cases.
• The consequence. A buyer completing 14 months after reception holds a 3-year tier with 22 months remaining and a 1-year tier already expired.
• The habit. Obtain the reception date in writing before signature, on every new build and every nearly new resale, and file it with the escritura.

Arithmetic makes the point better than argument. On a phase received in March 2025, the finishing tier died in March 2026, the habitability tier runs to March 2028, and the structural tier to March 2035; a buyer completing in May 2026 never held a year-1 right at all and prices the purchase accordingly, ideally against a thorough snagging report that did the finishing tier’s work before the notary. Nothing in that arithmetic is unfair once known; all of it is expensive discovered late.

Buyer scenario: a Belgian couple buying a 2-year-old “new” flat from its first owner in Estepona asked one question their lawyer had flagged, the reception date, and received the acta showing reception 26 months earlier. The 3-year tier had 10 months left, so they commissioned a €450 technical inspection focused on installations before signing, surfaced a heating defect, and had the seller claim it against the developer as a condition of completion. The warranty did its work one owner late, because one date was asked for in writing.

What is the seguro decenal and how do you find the policy?

A seguro decenal is the mandatory 10-year material-damage insurance behind the structural tier: Spanish law makes it a precondition for notarising and registering the sale of new residential builds, so a lawfully sold new home has a policy, an insurer and a sum insured, and the buyer’s only job is to hold the details.

1. What it covers. Material damage from structural defects, the article 17.1 class: foundations, load-bearing elements, slabs, structural stability.
2. Who takes it out. The promoter, before deliveries, with a regulated insurer, typically after an independent technical control body (OCT) has supervised the build; premiums commonly run 0.5% to 1% of build cost, priced into the scheme long before launch.
3. Where the details live. The escritura and the purchase pack reference the policy; the notary checked it existed at your signing, and your lawyer copies insurer, policy number and sum insured into your file.
4. Why it outlives everyone. Claims run against the insurer on a technical report, which is what makes the structural tier real when the promoting SPV was dissolved years earlier.

Self-build and micro-promotion nuance, flagged because coastal buyers meet it: the decenal obligation carries a narrow exception for individual self-promoters building for their own use, and that exception evaporates on sale within 10 years, when the seller must either contract the insurance or obtain the buyer’s informed waiver in defined terms. A new villa sold direct from an owner-builder without a decenal is therefore not automatically illegal, and it is automatically a red flag to price and a conversation your lawyer leads.

Underwriting snapshot from our files: on the 120 schemes this site reviews, the decenal question separates professional promotions from improvisations faster than any brochure metric, and it does so before a single euro moves. Listed and established developers volunteer insurer and OCT names in the legal pack as routine, the same way they name the Ley 57/1968 guarantee issuer and the building-licence reference, while the projects that stall on the question are reliably the same projects that stalled on the licence and the registry note a week earlier. Paperwork quality keeps being one variable across every check this site teaches: the buyer who has read a scheme’s decenal, its guarantee line and its building licence has read the promoter’s character in 3 documents, for less than €25 of registry fees, 2 short letters and roughly 3 days of elapsed time.

How do you claim, tier by tier?

Claiming under the LOE is one spine with three dressings: written notice with evidence inside the 2-year action window, diverging only in who answers and how much technical proof the tier requires. A snag-level year-1 claim needs photographs and a letter; a structural claim needs an informe pericial, typically €300 to €900, and usually a lawyer.

1. Document the damage. Dated photographs, video, and the first-appearance date, because article 18’s 2-year action window runs from manifestation.
2. Classify the tier. Symptom to cause: cosmetic finishes to year 1, installations and habitability to year 3, structure to year 10. Uncertain cases start with a technician, not a guess.
3. Notify in writing. Burofax to the developer (and administrator, in a community) stating defect, tier, article and remedy sought. Communities aggregate claims through the administrator, which multiplies leverage on shared elements.
4. Escalate on silence. For structural damage, the claim goes to the decenal insurer with the informe pericial; for the rest, a lawyer’s letter citing solidarity liability under article 17 precedes court, and most files settle at this step.
5. Mind both clocks. The tier decides coverage at the building’s age; the 2-year window decides your speed once damage shows. A habitability defect appearing in month 34 is covered, and waiting 25 months to act on it is fatal.

Communities are the force multiplier foreign owners underuse. Facade cracks, garage leaks and roof failures are common-element defects that belong to the comunidad, claimed once for everyone through the administrator with a single technical report, and an owner who reports early into that channel converts a private frustration into a funded claim. The first AGM after delivery is where those files open; attend it, or read its minutes.

Checklist for the claim file: photos with dates, the reception date, the escritura, the decenal policy details, every burofax and reply, and the informe pericial where the tier demands one. Files in this shape settle; files reconstructed 20 months after the leak fund the other side’s discount.

Who is liable: builder, promoter or insurer?

Article 17 LOE is a liability map drawn by role across every construction agent, and it hands the buyer a simplification that decides 9 cases in 10: the promoter answers solidarily with the others in buyer-facing scenarios, so the first claim letter goes to the developer, and the technical allocation between agents stays the professionals’ problem.

Agent	Answers for	Buyer’s practical route
Promoter (developer)	Solidarily across tiers in most owner claims	First addressee of every claim
Constructor (builder)	Year-1 finishing; execution defects	Via the promoter, directly on year-1 snags
Architect / technical architect	Design and supervision defects in their scope	Named in serious files by the informe
Seguro decenal insurer	Structural damage, 10-year class	Direct claim with technical report

Solidarity is the buyer’s friend and worth understanding in one line: where responsibility cannot be individualised, or the promoter’s own duties are engaged, the owner claims 100% of the damage from one defendant and the agents redistribute among themselves afterwards, which spares the owner a multi-party technical trial at the claim stage and typically saves 12 to 24 months of process.

Insolvency scenarios are where the architecture proves itself, and they are the checklist case for keeping the paper. A dissolved SPV takes the promoter route with it and leaves the rest standing: the builder and technicians remain personally liable in their scopes for their full 3-year and 10-year terms, the decenal insurer remains fully liable for structure, and communities routinely run exactly this pattern on buildings 6 to 9 years old whose promoters are long gone. The design anticipated the disappearing developer, which is precisely why the policy details and the agents’ identities, all sitting in the escritura and the libro del edificio, are documents to hold rather than trivia.

What if you buy into an already-delivered phase?

Warranties under the LOE are rights that attach to the building and transfer with it, so a second buyer inherits whatever remains of each tier counted from reception, and the purchase questions become 3 numbers and a history: the reception date, the tiers still alive, the decenal details, and any claims already made.

• The reception date. In writing, from the acta or via the administrator; every remaining right is arithmetic on this date.
• The claims history. Community minutes and the administrator’s file show open and settled defect claims, which is due diligence gold: a phase with a settled facade claim and a funded repair reads better than a phase with rumours.
• The decenal transfer. Nothing to do; the policy follows the building. The detail to capture is insurer and policy number into your own file.
• The snagging substitute. Year 1 gone means a pre-purchase technical inspection, €300 to €700 at this site’s standard band, does the finishing tier’s work before your money moves.

Market framing, because this scenario is a third of coastal purchases: delivered phases from established promoters, an Insur Scala in Estepona or a delivered South Bay Las Mesas phase, sell precisely on visible build quality plus live warranties, and the informed buyer prices the remaining tiers as an asset the way the due diligence guide prices clean paper generally. A 2-year-old flat with 12 months of habitability tier left and 8 years of structural cover is a different product from a 4-year-old flat with structure-only cover, at the same asking price, and almost no listing says so.

Case study in inherited rights: a community of 46 owners in a Málaga-province phase received in 2019 discovered garage waterproofing failures in 2024, year 5 of the building’s life, comfortably past the 3-year habitability tier and apparently outside every live warranty. The administrator’s technical report changed the classification: the failures traced to a structural execution defect in the deck slab, moving the claim into the 10-year class, and the decenal insurer, after a counter-report and 7 months of process, funded a repair the community had estimated at over €200,000, roughly €4,300 per owner avoided. The promoter had been dissolved for 3 years and was never a party to anything. Every owner who had bought resale in the intervening years inherited that outcome from a policy most of them had never read, which is the entire argument for reading it at purchase rather than at the leak.

Closing verification checklist

Eight lines that put the warranty position in your file before money moves.

• Reception date obtained in writing; tiers remaining computed from it, not from the completion date.
• Seguro decenal insurer, policy number and sum insured copied from the pack into your file.
• On micro-promotions and owner-built villas: decenal present, or the waiver conversation had with a lawyer.
• Snagging booked before handover on new stock; technical inspection (€300 to €700) on delivered stock past year 1.
• Community minutes read for claims history on any delivered phase.
• Boletines, libro del edificio and final-works certificate archived with the escritura.
• Any live defect: photographed, dated, notified by burofax inside the 2-year action window.
• Common-element defects routed through the administrator to claim once for everyone.

Frequently Asked Questions

What warranty does a new build have in Spain under Ley 38/1999? +

Three tiers from reception of the works: 1 year finishing (builder), 3 years installations and habitability, 10 years structural, the last backed by mandatory insurance. Tiers attach to the building and transfer to later buyers.

What is the seguro decenal and why does it matter to a buyer? +

The compulsory 10-year structural material-damage policy, a precondition for notarising new-home sales. It pays on a technical report even when the developer no longer exists, which makes the structural tier real for a decade.

When do the 1, 3 and 10 year warranty periods start in Spain? +

At reception of the works (acta de recepción, anchored by the certificado final de obra), not at your purchase. A buyer completing 14 months later inherits 22 months of the habitability tier and no finishing tier at all.

How long do I have to sue on a defect under the LOE? +

2 years from the damage manifesting (article 18), provided it appeared inside its tier. Coverage is decided by the building's age at manifestation; your speed is decided by the 2-year action window.

Who do I claim against for new-build defects in Spain: builder, developer or insurer? +

The developer first, who answers solidarily in most owner claims; the builder on year-1 finishing; the decenal insurer on structural damage with an informe pericial. Communities claim common elements once for everyone via the administrator.

Do LOE warranties still apply if I buy a nearly new flat from the first owner? +

Yes, whatever remains of each tier from reception transfers with the building, along with the decenal policy. The reception date, policy details and claims history are the three things to demand in the purchase pack.