How to claim building warranty defects in Spain: the LOE guide for foreign buyers

By AmigoFix · May 2026 · 11 min read

You bought a new-build apartment on the Costa del Sol. Six months in, you notice damp forming under the bathroom floor. The terrace grouting is cracking. The air conditioning unit in the master bedroom has stopped heating. You send a WhatsApp message to the developer's sales agent. They say they will look into it. Three months later, nothing has happened, and your one-year warranty window is about to close.

This scenario plays out constantly. An OCU consumer study found that the majority of new-build buyers in Spain report finishing defects after completion, and roughly a third of those defects remain unresolved a year later. For foreign buyers who are not in Spain full-time, the problem is worse: defects go unnoticed for months, developers are harder to chase from another country, and warranty deadlines expire before the owner realises they had rights in the first place.

Spain's building law gives you real, enforceable warranty protection. But only if you use it correctly, and in writing, before the deadlines pass.

What the LOE gives you

The Ley de Ordenación de la Edificación (LOE, Law 38/1999) establishes three warranty periods for new-build properties. All deadlines count from the fecha de recepción de la obra, the date the building was formally received from the constructor, not from the date you personally bought the apartment.

Two critical details that most foreign buyers are not told.

First, these rights transfer to subsequent buyers. Article 17.1 of the LOE explicitly covers "los propietarios y los terceros adquirentes." If you bought a resale property that is still within its warranty period, you can claim. The warranty attaches to the building, not to the original purchaser.

Second, once a defect manifests within the warranty period, you have an additional 2 years to file a legal claim (Article 18 LOE). But this only applies if the defect appeared within the warranty window. If a finishing defect first shows up at month 13, you have no claim under the 1-year warranty regardless of when you try to file.

Why WhatsApp messages do not work

The most common mistake foreign buyers make is reporting defects informally. A voice note to the developer's sales agent. An email to the after-sales department. A conversation at the construction office.

None of these constitute legally valid notice under Spanish law. When the warranty window closes and you need to enforce your claim, you need to prove that you reported the defect within the deadline. A WhatsApp message may or may not be accepted by a court as evidence. A burofax is always accepted.

What a burofax is and how it works

A burofax is a registered communication sent through Correos (the Spanish postal service) with certified content and confirmed delivery. It is the standard method for serving legally valid notices in Spain. When a burofax is delivered, both the content and the date of delivery are documented and can be used as evidence in any legal proceeding.

What a warranty burofax must include

• Your name, NIE, and the property address
• The developer's registered company name and address (from the escritura or the Registro Mercantil)
• A clear description of each defect, with reference to the relevant LOE article
• The date each defect was discovered and how it was documented (photographs, inspection report)
• A formal request for the developer to inspect and repair the defects within a specified timeframe (typically 15 to 30 days)
• A statement that failure to respond or repair will result in the owner exercising their rights under the LOE

The burofax must be drafted in Spanish. For a developer based in Estepona or Marbella, an English-language letter has no legal standing. The combination of formal Spanish drafting, correct legal references, and certified delivery is what makes a burofax effective.

The timing trap: why the 1-year window matters most

The 1-year finishing warranty is the most frequently lost. Finishing defects, paint cracking, tiles lifting, doors that do not close properly, grouting that shrinks, are by far the most common new-build problems. They are also the defects that non-resident owners are slowest to notice, because they are not living in the property full-time.

A British couple who visit their Estepona apartment twice in the first year may not notice that the bathroom tiles have a hollow sound indicating they were poorly bonded, or that the terrace drainage slope is slightly wrong and water is pooling against the sliding door frame. By the time they visit for a longer stay and find these issues, the 1-year window may have closed.

The warranty clock starts from the acta de recepción, the formal reception of the building from the constructor, which often happens before the individual apartment is sold to the end buyer. This means that for buyers who purchase a unit months after the building was completed, the warranty may already be partially consumed when they receive the keys.

A real example from the Costa del Sol

In late 2025, the first social housing development delivered in Marbella in 14 years was handed over with non-functioning lifts in all three blocks, water infiltrating through roof terraces into garages and lift shafts, and damp appearing on lower floors after the first heavy rains. These are habitability defects covered by the 3-year LOE warranty, but only if owners file formally. The ones who sent WhatsApp messages to the developer are in a weaker position than the ones who sent burofaxes.

What you should do right now

If you received your keys within the last 12 months

Walk through the property systematically or have someone do it for you. Check every room, every installation, every surface. Photograph everything you find. Send a burofax to the developer listing every defect before the 1-year window closes. Do not wait until you have "collected enough" issues. File now with what you have, and file again if more defects emerge.

If your 1-year window is about to close

File immediately. A burofax sent in month 11 preserves your rights for defects listed in it. A burofax sent in month 13 does not. The deadline is absolute.

If you are approaching the 3-year mark

Review the property specifically for habitability issues: persistent damp, insulation problems, drainage failures, electrical installation faults, HVAC failures. These defects may have appeared gradually and been treated as maintenance issues rather than warranty claims. If they relate to the original construction, they are covered, but only if you serve formal notice before the 3-year window expires.

If you bought a resale property

Check when the building's acta de recepción was signed. If the building is less than 10 years old, you may still have structural warranty coverage. If less than 3 years old, habitability coverage. The rights transfer to you as the current owner.

What it costs to miss the deadline

Replacing a faulty air conditioning unit after the warranty expires costs 2,000 to 4,000 euros. Fixing water infiltration through a terrace costs 3,000 to 8,000 euros. Replacing poorly bonded floor tiles in a bathroom costs 1,500 to 3,000 euros. All of these are zero-cost fixes if reported formally during the warranty period, because they are the developer's legal obligation.

The cost of tracking deadlines and serving burofaxes is a fraction of the cost of a single missed defect. The cost of not tracking them is whatever breaks after the window closes.