ΕλληνικάThe question that most concerns anyone holding Greek property without a title is not how adverse possession is established, but when it fails. The concern is well founded: twenty years of occupation is not sufficient in itself, and a series of legal and factual circumstances defeat recognition of ownership even where occupation has been long and undisturbed. From 16 September 2026 further strictly formal requirements apply: under article 61 of Law 5326/2026 (Gazette A’ 125 of 4 August 2026), cadastral mediation becomes compulsory for property recorded as “of unknown owner” and a defined list of evidence is imposed. This article examines first why claims fail, and then what exactly changes.
The framework in brief
Under article 1045 of the Greek Civil Code, a person who has possession of movable or immovable property for twenty years becomes its owner. This is extraordinary adverse possession, requiring neither good faith nor title. Ordinary adverse possession under article 1041 is shorter — ten years for immovable property — but requires good faith and a legal or putative title cumulatively. Decisive in both is the concept of possession: under article 974, a possessor is a person exercising physical control over the property with the intent of an owner. Under article 1051, a person who acquired possession by universal or singular succession may add the predecessor’s period to their own.
That is precisely where most failures originate: the distinction between possession and mere detention.
When adverse possession does not apply
- Where the property is not susceptible to adverse possession
No adverse possession runs over things outside commerce or otherwise excluded from the institution. Article 61 confirms this expressly for its own scope: the procedure does not apply to property falling within the public domain or to common property. Verification of the property’s character precedes everything else, because where the property belongs to the public domain no length of occupation produces ownership.
- Where there is detention rather than possession
This is the most common reason claims fail in practice. A person occupying under a lease, a loan for use, the owner’s tolerance or a relative’s permission does not exercise possession with the intent of an owner but detention on another’s behalf. That time does not count, however long it runs. Family tolerance — the property left with relatives to look after — is the classic case in which decades of occupation produce no proprietary right at all.
- Where the twenty-year period is not continuous
Continuous exercise of possession is required. Interruption, eviction, acknowledgment of a third party’s ownership or periods of abandonment all raise questions about completion of the period. Where use was seasonal or sporadic, the question is not how many years passed but what exactly was exercised and how it is proved.
- Where the period is not complete at the decisive moment
This is among the most significant changes. Article 61 requires the sworn statements to refer to twenty years of possession completed by the time of recourse to mediation. The decisive moment therefore shifts earlier than litigation practice ordinarily allows. A person in the nineteenth year gains nothing from time running before the hearing.
- Where the ten-year E9 declaration is missing
Article 61 requires production of the E9 property declaration covering the property for at least ten years before recourse to mediation. This is a free-standing formal requirement. A possessor of twenty years who declared the property only recently does not satisfy it, whatever the substantive strength of the possession. In practice this will exclude a significant number of otherwise sound cases.
- Where the documentary evidence is insufficient
The mediator must verify production of at least two of the following: electricity, telephone and water receipts in the claimant’s name; leases showing the claimant as lessor, or rent receipts; declarations before public or tax authorities; a building permit; topographical diagrams of certain date; and a private agreement of sale or division drawn up at least twenty years earlier bearing a certain date. A single item is not enough, and the deficiency cannot be made good by witness evidence.
- Where the sworn statements lack the required content
The two or more sworn statements must expressly refer to twenty years of possession completed by the time of recourse, and must specify the area, location and boundaries of the property. General statements that the property has always belonged to the family do not satisfy the statute.
- Where the new procedural requirements are breached
Three traps. First, failure to hold the compulsory initial mediation session renders the hearing of the claim inadmissible. Second, the invitation must issue at least thirty days after registration of the basic information sheet in the cadastral page; failure to observe that period voids the mediation record itself. Third, choosing the wrong procedural route: for a horizontal or vertical property marked “of unknown owner” an application is filed rather than a claim, unless extraordinary adverse possession is invoked as the title of acquisition.
Witness evidence: what actually has to be proved
The belief that adverse possession is proved “by witnesses” is only partly accurate and, under the new framework, dangerous. Sworn statements are mandatory, but they operate alongside documents rather than as a substitute: the statute requires at least two documentary items, at least two sworn statements and the ten-year E9, cumulatively.
The content of the evidence matters more. The witness must be able to attest to what they know personally: since when and how control over the property has been exercised, who cultivated, fenced, repaired, leased it or paid its bills, and within what boundaries and area. The evidence must describe conduct as owner, because that is exactly what distinguishes possession from detention. Evidence stating that the claimant “used” the property, without excluding use by permission or tolerance, can actively damage the case.
So-called “illegal” adverse possession
The term is widely used but is not a legal one. In extraordinary adverse possession under article 1045, good faith is irrelevant, and the possessor’s knowledge that the property belongs to another does not prevent acquisition after twenty years. What is required is not good faith but possession with the intent of an owner, exercised continuously and openly. Conversely, a person occupying with the owner’s consent or tolerance acquires nothing, however honest their belief. The distinction runs opposite to most people’s intuition and should be tested at the outset.
What changes from 16 September 2026
Article 61 of Law 5326/2026 amends article 6(2)(d) of Law 2664/1998 (A’ 275) and adds a new sub-paragraph (δα). To bring a declaratory claim of ownership based on extraordinary adverse possession over property recorded as “of unknown owner”, the claimant must, before the hearing, refer the matter to a compulsory initial mediation session before an accredited cadastral mediator holding a law degree, selected from a special register maintained by the Central Mediation Committee under article 10 of Law 4640/2019 (A’ 190).
The initiating party registers a basic information sheet with the Cadastre, signed by the mediator, on payment of a fixed registration fee, with registration completed by the following working day. The invitation to the compulsory initial session issues at least thirty days later.
The State, local authorities and public law entities participate compulsorily, represented by the competent officer of the Legal Council of the State or by legal advisers and lawyers with salaried mandate or special authority, with participation by video-conference available. The parties are notified in writing at least thirty days beforehand, and by the time of the session a document from the competent services must have been supplied on whether the State asserts rights. Failure to supply it creates a presumption that no rights are asserted, and late or omitted transmission constitutes a specific disciplinary offence under article 109 of Law 3528/2007 (A’ 26).
Where agreement is reached and the State declares that it does not object, the mediator annexes the evidence as a single body to the record. A certified copy, once filed with the registry of the competent court, is entered without delay at the Cadastral Office with extraordinary adverse possession as the cause of acquisition. The adverse possession tax declaration must be submitted before entry. In pending cases where a record has already been signed, it must be resubmitted accompanied by the evidence required under the new sub-paragraph (δα).
The cost of the procedure
Total cost comprises distinct elements. The cadastral mediator’s fee, to be set by joint decision of the Ministers of National Economy and Finance and of Justice, which was still pending at the date of writing. The fixed fee for registering the basic information sheet. The adverse possession tax, which follows the property transfer tax regime and is calculated on the value of the property, with the precise figure to be confirmed with the tax authority in each case. The cost of assembling evidence: sworn statements, a topographical diagram where geometrical changes are sought, certificates. And legal fees, together with court costs if the matter is not resolved in mediation.
The economic logic of the new framework is that successful mediation costs considerably less than years of litigation. The critical point, however, is that most of the expenditure precedes the outcome: the file must be complete before the process begins.
What to check before taking any step
The review follows a specific order. First the entry in the cadastral page, since article 61 applies only to property recorded as “of unknown owner”. Then the character of the property, to exclude public domain or common property. Then the legal quality of the occupation — possession with the intent of an owner, or detention under permission or tolerance. Then completion of the twenty-year period at the decisive moment, including any addition of a predecessor’s time under article 1051. Finally the completeness of the file: at least two documents, two sworn statements with the required content, the ten-year E9 and, where geometrical changes are sought, the topographical diagram with proof of electronic submission, on pain of nullity.
Conclusion
Adverse possession usually fails not because the period is too short, but because the occupation was not possession, because a formal element is missing, or because a procedural requirement was breached. From 16 September 2026 the formal requirements increase, and some of them — the ten-year E9 and the decisive moment for completing the twenty years — cannot be cured after the event. Early legal review is not a procedural luxury; it is the only point at which most of these problems can still be fixed.
Frequently asked questions
What is adverse possession under Greek law?
An original mode of acquiring ownership. Under article 1045 of the Civil Code, twenty years’ possession of immovable property confers ownership without title or good faith; under article 1041, ten years suffice where good faith and a legal or putative title are present.
When does it not apply?
Where the property is not susceptible to adverse possession or belongs to the public domain; where there is detention rather than possession with the intent of an owner; where the period is not continuous or not complete at the decisive moment; and, under the new framework, where the formal evidence is missing or the procedural requirements are not observed.
Are witnesses enough?
No. At least two documentary items from the statutory list, at least two sworn statements with defined content and a ten-year E9 declaration are required cumulatively.
What does it cost?
The mediator’s fee, to be fixed by joint ministerial decision; the fixed registration fee; the adverse possession tax following the transfer tax regime; the cost of assembling evidence; and legal fees.
Does it apply to apartments?
For horizontal or vertical properties marked “of unknown owner”, an application is filed rather than a claim, unless extraordinary adverse possession is invoked as the title of acquisition.
Does a previous occupier’s time count?
Under article 1051 of the Civil Code, a person who acquired possession by universal or singular succession may add the predecessor’s period of possession.
Contact
OIKONOMAKIS LAW advises on cadastral entry reviews, assessment of the legal quality of occupation and of the completeness of the file, representation in cadastral mediation, preparation and filing of the relevant claims or applications, and completion of the tax and cadastral formalities, including for clients resident abroad.
Email: leads@oikonomakislaw.com
Athens office telephone: +30 21 0360 0036
Offices: Athens · Thessaloniki · Piraeus · Heraklion — oikonomakislaw.com/contact-us/
Disclaimer
This article is provided for information purposes, reflects the framework in force as at the legal review date stated above and does not constitute legal advice on any specific matter. Each case turns on its own facts and on the state of the relevant cadastral page.
Sources
Law 5326/2026 (Gazette A’ 125 of 4.8.2026) — full text — https://www.e-nomothesia.gr/kat-dikasteria-dikaiosune/nomos-5326-2026.html
Law 5326/2026 — article-by-article presentation — https://www.taxheaven.gr/law/5326/2026
Greek Civil Code, articles 974, 1041, 1045, 1051 and 1054
Law 2664/1998 (A’ 275) — National Cadastre, article 6, as amended by article 61 of Law 5326/2026
Law 4640/2019 (A’ 190) — mediation in civil and commercial matters, articles 6, 7, 8 and 10
Law 3528/2007 (A’ 26) — Civil Servants’ Code, article 109
Prepared by Christos Oikonomakis, Chairman, OIKONOMAKIS LAW