Impugnacion de acuerdos in Spain: challenging community decisions under LPH Article 18

A community agreement is not a democratic suggestion you can ignore. Once the junta de propietarios adopts a resolution, it binds every owner and the community can enforce it through the courts. The single legal escape valve is the impugnacion de acuerdos under Article 18 of the Ley 49/1960 de Propiedad Horizontal (LPH): a judicial action that asks a judge to revoke an agreement that is contrary to law, gravely harmful to the community, or gravely prejudicial to an owner. The catch is that the door is narrow. Three requirements must converge at once, the deadlines are short, and a misstep on any one sinks the challenge regardless of the merits.

This guide explains the procedure in plain terms: the three grounds, who has standing, the three-month and one-year deadlines, the debt-payment rule and its Supreme Court extension, the juicio ordinario route, and the rule that impugnacion does not suspend the agreement. If you are buying into a Costa del Sol urbanisation governed by the LPH, or you already own and a junta decision has landed that you believe is unlawful, this is what you need to know.

What are the three grounds for impugnacion under Article 18.1 LPH?

Article 18.1 of the LPH lists three closed grounds on which an agreement is impugnable before the courts. The list is exhaustive, so a challenge outside these three fails at the door.

The first ground covers agreements contrary to the law or to the community statutes. This is the broadest ground and the only one that triggers the longer one-year deadline. Typical examples include agreements adopted with a quorum below the legally required majority, the appointment of a president who is not an owner, expense distributions that depart from the cuotas de participacion fixed in the titulo constitutivo, and agreements on items that did not appear on the orden del dia. The community governance rules set the majorities and procedures whose breach falls here.

The second ground covers agreements gravely harmful to the community’s own interests in benefit of one or several owners. This ground requires both elements simultaneously, a serious harm to the community and a benefit to specific owners, and the Supreme Court’s STS 572/2009 of 16 July annulled an agreement that modified a building’s roof for the exclusive benefit of one owner at the community’s expense. Where only one element is present, the case must be channelled through the third ground.

The third ground, the most frequently invoked, covers agreements that cause grave prejudice to an owner who has no legal obligation to bear it, or that are adopted with abuso de derecho. The Supreme Court has defined abuso de derecho in the property-horizontal context as the community’s use of a norm, in bad faith, to the prejudice of an owner without any real benefit to the community. Recognised examples include forcing an owner to reverse works that were tolerated for 20 years (STS 12/2022 of 12 January), concealing the real terms of a lift-lowering works project from an owner (STS 216/2019 of 5 April), and sanctioning an owner for air-conditioning perforations that were necessary for habitability and did not alter the structure (STS 865/2011 of 17 November). The common thread is unequal or discriminatory treatment between owners, approving for one what is denied to another in the same situation.

What is the difference between a nulo and an anulable agreement?

The distinction between nulidad and anulabilidad conditions the entire strategy because it determines the deadline. Although the two terms are used interchangeably in ordinary speech, they are legally distinct categories with very different consequences.

An agreement that is nulo de pleno derecho has no effects from its origin, cannot be convalidado and, in principle, can be challenged without a time limit. An anulable agreement, by contrast, is valid until it is challenged, and if nobody challenges it within the legal deadline it is convalidado and produces all its effects.

The general rule in the property-horizontal regime, fixed by Supreme Court jurisprudence, is blunt: within the LPH there are no agreements nulos de pleno derecho, only anulables, which must be challenged within the legal deadline. The STS 654/2010 of 29 October established this principle. This means that even an agreement that clearly infringes the LPH is convalidado if it is not challenged in time.

When does radical nullity without a time limit arise? When the agreement infringes an imperative norm outside the LPH. The classic example is a junta decision not to pay the building porter’s social security contributions, which infringes labour law and is nulo de pleno derecho, challengeable at any time. The STS 343/2010 of 11 June applied this logic to an agreement that locked the building’s entrance, blocking an emergency exit in breach of fire-prevention regulations.

Even this rule is not absolute. The Supreme Court has evolved to treat certain frontal breaches of the LPH itself as nulo de pleno derecho. The STS 572/2020 of 3 November held that the rules on citaiones and convocatorias are imperative and their breach carries radical nullity of the junta and all its agreements. The same applies to appointing a non-owner as president (STS 52/2017 of 27 January and STS 514/2015 of 23 September) and to pseudo-agreements adopted at illegitimate meetings of a group of comuneros (STS 332/2024 of 6 March). The first thing a lawyer does when assessing a challenge is classify the agreement on this spectrum, because it fixes the deadline.

Who has standing to challenge a community agreement?

Article 18.2 LPH grants standing to three categories of owner. The first is owners who voted against the agreement and saved their vote in the acta, the meeting minutes. Saving the vote means recording the dissent in writing, and it is the procedural prerequisite that preserves the right to challenge. The second is owners who were absent from the meeting for any reason, whether through illness, travel, or simply not receiving proper notice. The third is owners who were improperly deprived of their right to vote, for example because the president refused to let them speak or the community applied an unlawful exclusion.

Article 18.2 adds a procedural gate that trips up many challengers: to impugn, the owner must be up to date with the payment of all vencidas debts owed to the community, or must have consigned the amount judicially beforehand. This is a procedibility requirement, not a defence on the merits, and failure to meet it leads to dismissal without the court examining the substance of the challenge. The logic is that an owner who has not paid their share should not use the courts to disrupt the community’s decisions.

The statute carves out one express exception: the debt-payment requirement does not apply when the challenged agreement concerns the establishment or alteration of the cuotas de participacion referred to in Article 9 LPH. The Supreme Court extended this exception significantly in STS 613/2013 of 22 October, holding that the exception covers not only agreements modifying the cuota in the titulo constitutivo but any agreement that establishes a system of expense distribution, whether general or for particular expenses, and whether permanent or one-off. The case concerned an agreement exempting ground-floor owners from the cost of lowering the lift to street level and redistributing their 12 per cent share across the other flats. The court held this was an alteration of the expense distribution system, so the debt-payment requirement did not apply. The community dispute resolution guide covers the broader set of remedies, including arbitration, that sit alongside the Article 18 action.

What does not qualify for the exception is an agreement that applies the existing distribution system, such as approving a budget, liquidating an owner’s debt, or setting a standard derrama extraordinaria that follows the established cuotas. The Supreme Court was explicit on this: the exception reaches alterations to the system, not applications of it.

What are the deadlines and how do they run?

Article 18.3 LPH sets two deadlines, both of caducidad rather than prescripcion. The distinction matters. Caducidad is a strict procedural deadline that the judge can apply on its own motion, it does not interrupt with a burofax or a protest letter, and once it passes the action is gone. Prescripcion, by contrast, is a substantive deadline that generally requires the other party to invoke it.

The general deadline is three months from the date the junta adopts the agreement. The extended deadline is one year, and it applies only when the agreement is contrary to law or to the community statutes, the first ground in Article 18.1. The two other grounds, serious harm to the community and serious prejudice to an owner, carry the three-month deadline even if the breach is egregious.

For absent owners, the deadline does not run from the meeting date. It runs from the date the community formally communicates the agreement, following the notification procedure in Article 9 LPH. This is a meaningful protection for non-resident owners who may not learn of a junta decision for weeks, but it places the burden on the community to prove communication, not on the owner to prove ignorance.

Since the entry into force of Ley Organica 1/2025, attempting an adequate alternative dispute resolution method suspends the caducidad deadline while the attempt lasts. This means that engaging a mediator or an arbitrator before filing can buy time, but only if the method qualifies as adequate under the statute. A burofax or a protest at the meeting does not suspend the clock. The community meeting types guide explains the notice and acta procedures whose defects often anchor a challenge.

What judicial procedure applies and does filing suspend the agreement?

The impugnacion de acuerdos is a judicial action, not an administrative one. A burofax to the president, a dissent recorded in the acta, or a mediation session does not annul an agreement. Only a court sentence revokes it. Article 18.1 LPH states the agreements are impugnable ante los tribunales, and Article 249.1.8 of the Ley de Enjuiciamiento Civil (LEC, Ley 1/2000) routes the action to the juicio ordinario before the juzgados de primera instancia, regardless of the amount at stake. The juicio ordinario is the fuller of the two ordinary civil procedures, with a written demanda, a contestacion, a hearing and a trial, and it typically runs to 12 to 18 months from filing to first-instance sentence.

Article 18.4 LPH sets the suspension rule: filing the impugnacion does not suspend the agreement’s execution. The agreement remains in force and the community can act on it while the litigation runs. The judge may order a cautelar suspension at the challenger’s request, after hearing the community, when the challenger shows apariencia de buen derecho, a prima facie case, and peligro en la demora, a risk that delay will cause irreparable harm. The judge usually requires a caucion, a security deposit, to protect the community if the challenge ultimately fails. This means that a derrama the challenger believes is unlawful can still be collected, and an obra can still proceed, unless the challenger specifically requests and justifies a cautelar suspension.

How does the impugnacion interact with the community-rule enforcement framework?

The impugnacion de acuerdos sits at the top of a layered enforcement and challenge framework within the LPH. Below it sit the community rule violation penalties under Article 7, which let the community sanction an owner for breaching the rules, and the president’s provisional measures under Article 7.2, which can halt activities immediately without a junta vote. The impugnacion is the owner’s counterweight, the mechanism to push back when the community’s own exercise of power oversteps.

A practical example illustrates the interaction. An owner in a Costa del Sol urbanisation installs air-conditioning units that require wall perforations. The junta, relying on an external-facade alteration prohibition in its statutes, orders the owner to remove the units and pay a fine. The owner has two options. They can comply and then challenge the agreement under Article 18 on the third ground, arguing abuso de derecho because the perforations were necessary for habitability and did not alter the structure, the STS 865/2011 line. Or they can seek a cautelar suspension before complying, arguing the fine and removal order cause grave prejudice the owner has no obligation to bear. The choice depends on the deadline, the strength of the abuso de derecho case, and the owner’s willingness to post a caucion.

The framework is deliberately weighted towards community stability. The majority decides, the agreement binds, and the minority must go to court to overturn it. The impugnacion is the safety valve, but it is a safety valve with a short fuse and a strict gate.

Requirement	Rule	Source	Deadline
Ground (a)	Contrary to law or statutes	LPH Art 18.1.a	1 year
Ground (b)	Gravely harmful to community in benefit of owner(s)	LPH Art 18.1.b	3 months
Ground (c)	Grave prejudice to owner or abuso de derecho	LPH Art 18.1.c	3 months
Standing	Dissenting, absent or improperly excluded voters	LPH Art 18.2	At filing
Debt-payment	Up to date or consigned judicially	LPH Art 18.2	At filing
Exception	Cuota or expense-distribution alteration	STS 613/2013	Exempt
Procedure	Juicio ordinario, any cuantia	LEC Art 249.1.8	Filing
Suspension	Not automatic, cautelar only	LPH Art 18.4	On request
ADR	Suspends caducidad if adequate	Ley Organica 1/2025	During attempt