Most buyers assume that clock starts on Spain’s new home 10 year warranty the day they sign at the notary. It doesn’t. Getting this wrong can mean buying a “new” home that actually has a lot less warranty left than you think.
The Clock Starts At Completion, Not Purchase
The 10-year warranty, along with two shorter ones starts on the date the building is officially finished, not the date you buy it. That completion date is documented in two related pieces of paperwork:
The acta de recepción is the formal handover document where the developer accepts the finished building from the construction company.
The certificado final de obra is the technical architect’s certification that the building was actually completed according to plan.
Together, these establish the official completion date the whole warranty system runs on.
The developer is responsible for getting both of these documents in order, not the buyer. They’re required before the building can be legally registered or sold. If a completion date can’t be documented, that’s a real red flag rather than a minor paperwork gap. It usually means something is unfinished, unresolved or being deliberately hidden. If this is the case with a property you’re thinking about, It’s worth pausing and asking your gestor or a property lawyer to look into it before you go any further.
Here’s where that matters. Say a developer finishes a home and instead of selling it, rents it for a year or two first. When you buy it, you’re not getting a fresh 10-year warranty starting on your purchase date. You’re getting whatever’s left of the original 10 years, counted from when the building was actually completed. Buy two years after completion and you’re getting roughly 8 years of coverage, not 10, even though the home might still be marketed to you as new.
One Year, Three Years, Ten Years: What Each Tier Actually Covers
Spain’s building law, the Ley de Ordenación de la Edificación or LOE, sets up three separate guarantee periods on new construction homes depending on how serious the defect is.
One year covers finishing defects, cracked paint, tile issues, that kind of thing.
Three years covers habitability problems, things like leaks or electrical faults that affect actually living in the place.
Ten years covers structural defects, foundation problems, cracked beams, anything that threatens the building’s basic stability.
Here’s the detail most guides skip: only the 10-year tier has to be backed by mandatory insurance, the seguro decenal. The 1 and 3-year guarantees are still real legal protections, the promoter and builder remain responsible for those defects during those windows. They aren’t necessarily backed by a required insurance policy the same way the structural one is. The developer is who you’d go after for those shorter-term issues, insurance or not.
Once a covered defect actually shows up you have 2 years from that point to file a claim. The guarantee period determines whether a defect is covered at all and the 2-year window is how long you have to act once you’ve spotted it. The burden of proving when a defect actually appeared falls on you, not the developer or the insurer. If you wait a long time to report something and the developer disputes the timeline, you’re the one who needs evidence that it showed up when you say it did.
That’s worth taking seriously if you ever spot something. Document it right away, dated photos, a written note to yourself and ideally a report from an independent technical expert, a perito, if the issue looks serious. Waiting months to report a leak you noticed makes it easier for a developer to argue you’re out of time even if you technically aren’t.
Here’s an example. You notice a problem, a persistent leak in year 3. Since it showed up within the 3-year window, it’s covered. You now have 2 years from the day you noticed it to actually file a claim. That gives you until roughly year 5 to act on something you spotted in year 3. The defect has to appear within its guarantee window. The 2-year period only kicks in after that.
What Decenal Insurance Actually Covers
This policy exists for one specific category. Structural damage. Foundation settling, cracked load-bearing walls, beam or slab failures, anything that genuinely threatens the building’s stability. It does not cover damage from misuse, unauthorized renovations someone made later, extraordinary natural events that aren’t normally insurable or ordinary finish and installation problems. Those fall under the shorter 1 and 3-year windows instead.
What If The Developer Goes Bankrupt
This is one of the more reassuring parts of how the system works. The decenal insurance is a policy held with an insurance company. If the developer goes out of business, gets sued or disappears entirely after your purchase, the insurance itself is still there.
Buying A Resale Home That’s Still Under Warranty
If you’re buying a home that’s less than 10 years old from its original completion date from a private owner, ask for the seguro decenal certificate directly. The current owner should have received it from the original developer. It’s supposed to transfer with the property. Don’t just assume it exists. Confirm exactly how many years are left based on the original completion date not the date the current owner bought it.
A notary shouldn’t authorize the sale of new construction without this insurance in place. A registrar shouldn’t record it either. That’s a safeguard on the system, not a substitute for checking yourself. Ask for the documentation from the owner directly and do it before you’re sitting at the notary’s table signing.
The Autopromotor Exception
One narrow exception worth noting. If someone builds their own single-family home purely for personal use (an autopromotor) Spanish law lets them skip the decenal insurance entirely. If that person sells the home within the first 10 years they generally become obligated to get the insurance for whatever years remain, unless the buyer specifically agrees in the sale contract to waive that requirement.
If you’re ever buying a self-built home from its original owner-builder, it’s worth asking about.