What opposing a regularization involves, the avenues for challenging one, and the procedural and substantive defenses, with the current legislation and the criteria of the higher courts.

Decree Law 2,695 (D.L. 2.695) establishes an administrative procedure, run by the Ministry of National Assets (Bienes Nacionales), that allows the material possessor of a low-appraisal property to regularize their situation, register the property in their name and, once the statutory period has elapsed, acquire ownership by prescription. Because it is an exceptional procedure that can displace the registered owner, the legal system provides mechanisms for the owner and affected third parties to defend their rights. The principal one is the opposition.

This guide explains what the opposition involves, the avenues for challenging a regularization, and which defenses, procedural and substantive, are worth considering.

Decree Law 2,695, of 1979, has been updated by recent reforms that are essential to keep in mind:

  • Law No. 21,108 (Ley N° 21.108) (2018): extended the third-party opposition period from 30 to 60 business days and raised, from one to two years, the period of registered possession required to acquire ownership by prescription.
  • Law No. 21,633 (Ley N° 21.633) (2023): as part of the legislation on unlawful occupation (usurpación), requires the applicant to declare under oath that they have no pending lawsuit or conviction for the offenses of usurpation under Articles 457 et seq. of the Criminal Code (Código Penal), and bars regularization while a lawsuit of that kind is pending.
  • Law No. 21,737 (Ley N° 21.737) (2025): set a single tax-appraisal cap of 1,000 UTM (monthly tax units), applicable to both urban and rural land.

The three avenues for protecting the third party

The statute arranges the protection of the affected party into three successive mechanisms, each with its own window:

  1. The opposition (Articles 19 to 25): raised within the procedure, before registration, within 60 business days counted from the last notice.
  2. Ownership actions (Articles 26 and 27): the action for recovery of possession (acción reivindicatoria) that a third party may bring within the two years following registration, in summary proceedings.
  3. Monetary compensation of rights (Articles 28 to 30): reserved for those who neither opposed nor brought a recovery action in time, and for co-owners (comuneros) and holders of rights in rem.

Identifying the stage the case is at is the first step of any strategy.

The four grounds for opposition (Article 19)

The opposition must be grounded in one of the four exhaustive grounds of Article 19, filed within the deadline and heard before the competent trial court judge (juez de letras):

  • No. 1. Being the registered possessor of the property or of a specific portion of it, provided the title confers exclusive possession. A mere co-owner cannot invoke it.
  • No. 2. Having an equal or better right than the applicant, that is, meeting the requirements of Article 2 with respect to the whole property or a part of it. This requires filing a counterclaim (reconvención).
  • No. 3. That the applicant fails to meet the requirements of Article 2, typically the lack of material possession.
  • No. 4. Being a community of registered possessors that is in liquidation when the application is filed.

Procedural defenses

Before the merits, it is worth reviewing the formal aspects, which are frequently decisive:

  • Deadline. Verify that the opposition is filed within the 60 business days from the last notice. The counting of business days is governed by Law No. 19,880 (Ley N° 19.880), on the framework of administrative procedures.
  • Identification of the ground. The opposition must invoke a specific ground under Article 19 and cite it by number; failing to identify it is a frequent reason for rejection.
  • Response hearing and timely service (Article 22). Once the opposition is filed, the court sets a response hearing, held between 10 and 30 business days after filing. The opposition must be served on the applicant at least three business days in advance of that hearing, under penalty of the opposition being deemed not filed and registration being ordered, a ruling that is not subject to appeal. It is a procedural burden that, if neglected, causes the opposition to be lost without even debating the merits, so controlling the service deadlines is essential.
  • Standing. Where the applicant is a third party outside the community, a co-owner may indeed oppose in defense of the registered possession, and may even appear on behalf of the entire community, since this is a conservatory act covered by the tacit and reciprocal mandate of Articles 2305 and 2081 of the Civil Code (Código Civil).
  • Jurisdiction. The opposition phase is heard before the trial court judge of the territory where the property is located.

Substantive defenses

  • Exclusive registered possession (ground No. 1). This is the most effective defense and expresses the primacy of registered possession over mere material holding. To invoke it, it is enough to prove the current registration and its history: the opponent is not required to prove material possession, since that is a requirement of the applicant, not of the party opposing.
  • Lack of material possession by the applicant (ground No. 3). The debate shifts to whether the applicant possessed with the intent of an owner or was a mere holder. The evidence should focus on the positive acts under Article 925 of the Civil Code: enclosures, constructions, plantings and sowings.
  • Properties of greater area and overlaps. Regularization is not available over part of a larger property covered by a registered title. Once an overlap is proven, the opposition may be upheld only as to the affected strip, with registration of the remainder being ordered. That is why the topographic survey (pericia topográfica) is often decisive.
  • Burden of proof and assessment in conscience. The burden falls on the opponent, and Article 22 requires the evidence to be weighed in conscience (en conciencia), which allows even expert reports submitted after the first-instance judgment to be considered (Article 431 of the Code of Civil Procedure (Código de Procedimiento Civil)).

If the opposition deadline has passed

Even if the opposition has lapsed, other avenues remain:

  • Action for recovery of possession under Article 26, within two years from registration, in summary proceedings, and, in the alternative, the compensation under Article 28.
  • Public-law nullity (nulidad de derecho público) of the regularization act, as a last-resort remedy, reserved for manifest defects such as the failure to notify or to publish notices. Its success is uncertain and requires proving the date on which the act became known.
  • Application for a declaration of inapplicability (requerimiento de inaplicabilidad) before the Constitutional Court (Tribunal Constitucional), where there is a pending judicial matter and the specific application of the decree arbitrarily affects the right of property. The outcome is decided case by case.

Thresholds that change the strategy

Two situations can put the regularization out of place from the outset:

  • Appraisal above 1,000 UTM. The property falls outside the decree (Law No. 21,737), which enables an opposition for failure to meet the requirements of Articles 1 and 2.
  • Pending usurpation lawsuit. If there is a lawsuit for the offenses of Articles 457 et seq. of the Criminal Code over the property, the procedure is inadmissible, under Article 6 as amended by Law No. 21,633.

What the courts say

The higher courts apply Decree Law 2,695 restrictively, since it is an exception to the registration system and to the constitutional guarantee of property. Along these lines, it has been held that the ground under Article 19 No. 1 is made out by the opponent’s registered possession alone, without requiring material possession; that a co-owner may oppose a third party outside the community in defense of the registered possession; and that the opposition may be upheld in part when an overlap of boundaries is proven. On constitutional matters, the Constitutional Court has upheld the decree in the abstract, but has granted applications for inapplicability where its specific application results in an arbitrary impairment of the right of property.

To consult the current rulings, it is best to turn to the official sources: the case law of the Judiciary (Poder Judicial) and the Constitutional Court. The official text of the decree and its reforms is available at the Library of the National Congress (Biblioteca del Congreso Nacional).

Recommendation

The opposition to a regularization is won, almost always, in the details: the exact deadline, the correct ground, an up-to-date registration and a well-prepared survey. In the La Araucanía Region, where many rural properties are included in larger master registrations (inscripciones matrices), the early analysis of the records and the boundaries is decisive. If you are facing a regularization that affects your property, or you need to regularize your own, see our Land Title Regularization practice or contact us to assess your case.

This article is general and informational in nature and does not constitute legal advice for any specific case. The legislation and case law cited should be verified in their current version before making any decisions.