Hidden defects: what to do if your resale home hides a flaw

Picture it. You have signed at the notary, taken the keys, crossed the threshold with that particular feeling that only exists the first time. Three weeks later you move the wardrobe in the master bedroom and a black stain the size of a plate appears. The wall behind it is soft. You had not noticed the smell. Neither had the seller, of course.

In Spain you are not defenseless. The Civil Code devotes six articles to the matter, lawyers call it the seller's warranty for hidden defects, and the regime predates modern Alicante. But the law asks something in return: act fast.

What counts, legally, as a hidden defect

Article 1484 of the Civil Code describes a hidden defect as a flaw the property carried before delivery, one the buyer could not detect by normal inspection, serious enough to make the home unfit for living or, had you known, you would have paid less for it.

Four conditions, none negotiable. If the defect was visible, it is not hidden. If it appeared after delivery, it is not hidden. If it was a cosmetic complaint without weight, it is not hidden. And if the crack ran across the living room wall when you visited, it is not hidden either.

What does count: structural damp covered with plastic paint, electrical wiring of non regulation gauge, termite colonies in wooden beams, aluminosis in the slabs, leaks inside embedded drainpipes, roof faults that only show up with the first heavy October rain.

The six month clock

Article 1490 grants you six months from delivery to file a claim. Six. Not from the day you discover the defect, from the day you receive the keys. And it is not a prescription period that you can stop with a recorded letter. It is a forfeiture period: it runs alone, indifferent, until it expires.

That means a certified email to the seller does not pause the count. The action is preserved only by filing a court claim within six months. Harsh, and true. Most losing claims do not lose on the merits, they lose by arriving late.

Two doors: rescind or reduce

Article 1486 opens two paths, and you choose one. Only one.

The redhibitory action unwinds the sale. The seller returns the price, you return the property, everything goes back. It makes sense when the defect leaves the property nearly useless for living and a repair would not compensate.

The quanti minoris action (also called estimatory) keeps the sale alive but adjusts the price downward, by the cost of fixing the defect. This is the usual choice: you keep the home, recover the difference, and renovate at your own pace.

One important difference: only if you choose rescission can you also claim damages, and only when you prove the seller knew about the defect and concealed it (Spanish Supreme Court ruling 757/2007, of 21 June). Choose the price reduction and you get the price reduction.

When the defect is so serious it changes the deadline

The Spanish Supreme Court applies a doctrine when a defect is not just a fault but turns the delivered thing into something that no longer serves the agreed purpose. They call it aliud pro alio, one thing for another.

If you bought a home to live in and the slab is so damaged that the technician advises against living there without major structural work, this is no longer a hidden defect. It is a breach of contract. And the deadline ceases to be six months and becomes five years (Article 1964 of the Civil Code), because the general regime for personal actions applies.

The distinction is not academic: it is the difference between I missed the deadline and I have years to file. Any decent civil lawyer will start there when you bring the case.

If the seller is a professional, different rules

When the seller is a company (developer, bank holding repossessed stock, fund) and you act as a consumer, Royal Legislative Decree 1/2007 also applies. The legal conformity guarantee runs three years from delivery, and during the first year the defect is presumed to have existed at handover. The burden of proof flips: the seller must show there was no defect at delivery.

It is a remarkable protection and worth knowing. When the property comes from a private seller, on the other hand, you return to the Civil Code regime and the six month window.

The name that gives chills: aluminosis

The Costa Blanca built heavily between the fifties and the seventies, and part of that stock used aluminous cement. Bauxite and limestone, fast setting, high early strength, perfect on paper. With the decades, however, calcium hydroaluminates transform, the concrete loses load capacity and the joists begin to degrade. This is aluminosis.

A small repair can start at one thousand euros. Replacing joists in a heavily affected building runs into tens of thousands. Aluminosis is the textbook hidden defect: invisible to the eye, present long before your purchase, capable of disabling the property. When it appears, it is almost always litigated as aliud pro alio.

The defense that matters: a technical report before signing

Filing a claim afterwards is your right. Detecting beforehand is your strategy. For three hundred to a thousand euros, a chartered architect or quantity surveyor in Alicante visits the property for an hour, takes a technical record of roof, facades, installations, carpentry and shared elements, and hands you a report with priorities and indicative budget.

It is the most profitable investment of the whole purchase. A report that catches rising damp before signing saves you years of litigation, or a real discount in the negotiation. And if a defect exists and was not detected, the report stands as proof of how diligently you acted, which also weighs in court.

If you discover the defect: the sequence

First, photograph and date everything. Any modern phone embeds metadata in the image. Document the scope.

Second, commission an expert report. An architect expert charges between 300 and 1,500 euros depending on complexity, and the report is what sustains the lawsuit. Without it there is no serious claim.

Third, see a civil lawyer. The six month count is unforgiving and the choice between redhibitory, quanti minoris or aliud pro alio shapes the entire strategy. This is not a step to improvise.

Fourth, if there is still room, try the out of court route. A reasonable price reduction proposal, backed by an expert report, resolves many cases before they reach the court. When it does not, filing in time is the only thing that preserves your right.

What is not a hidden defect

To sharpen the lens: a boiler that breaks after two years is not a hidden defect, it is wear. The scratched parquet you saw during the visit is not a hidden defect, it is a manifest one. The kitchen ceiling crack already in the listing photos is not a hidden defect. And the kitchen you do not like, obviously, is not either.

The law protects the diligent buyer, not the inattentive one. That is why the prior inspection changes the game, and why it pays to buy alongside someone who looks where you do not yet know how to look.

At ESYS VIP we help you walk each property with the trained eye of someone who knows where to look. If you want to meet the next home that could become your life on the Costa Blanca, you can explore our properties or contact us and we will review what you are considering, together.