Written by Rikard 14 years in construction and owner-side project management €150M+ in governed project value.
Law 3843/2010 and the Current Regularisation Framework
Law 3819/2010 forms part of the early legislative history, but Law 3843/2010 is the relevant 2010 framework for building excesses and changes of use. Later regimes included Laws 4014/2011 and 4178/2013. Law 4495/2017 created the principal framework, whose relevant provisions are now codified in Law 5306/2026 for classifying and regularising unauthorised construction. Article 43(4) of Law 5270/2026 extended the submission deadline for eligible Categories 1 through 4, covering qualifying works completed before 28 July 2011, to 31 March 2028; it did not replace Law 4495/2017.
Illegal Constructions in Greek Property: What Foreign Buyers Must Know Before Signing
A significant share of Greek property listings, particularly villas, island homes and rural assets, may contain elements built without a valid permit or beyond approved plans. If unresolved before transfer, the physical work and associated compliance, cost, transferability or demolition exposure can remain with the property and affect the buyer. Identifying that exposure before signing is the purpose of an independent property inspection.
What Counts as an Illegal Construction in Greece?
Greek planning law defines authorized construction strictly: every built element must correspond to an approved building permit. Anything beyond that, regardless of age, appearance or seller assurances, is potentially unauthorized.
Common examples include enclosed balconies or terraces, extensions beyond permitted square meters, additional floors or mezzanines, pools constructed without updated permits, converted semi-outdoor spaces and storage rooms added after original construction.
Many of these are visually indistinguishable from legally permitted elements. They appear in estate agent listings. They feature in professional photographs. They are priced into the asking figure. The permit file tells a different story.
What Exposure Can Remain with the Property?
Under Greek law, the obligation to regularize unauthorized constructions transfers with ownership. Buying a property with outstanding permit violations means inheriting the responsibility, and the cost of resolution.
Consequences of unresolved unauthorized constructions include inability to obtain renovation or construction permits, complications at resale or refinancing, potential fines and compulsory demolition orders, and complications with estate and inheritance proceedings.
Sellers are required to disclose permit status. In practice, disclosure is inconsistent and legal representation alone is not sufficient to identify physical discrepancies between approved drawings and the actual building.
BEFORE YOU COMMIT TO A PROPERTY IN GREECE
Send the permit file, floor plans or Building Identity documentation before signing anything.
We perform preliminary remote permit reviews for foreign buyers evaluating properties in Greece.
This early-stage review identifies likely permit inconsistencies, undeclared square metres, unauthorised modifications and regularisation exposure under Law 4495/2017 and Law 5270/2026.
The review is independent, English-language and delivered directly to the buyer.
Submit the property details here: kgnordic.com/contact
Can Illegal Constructions Be Legalized?
Greece has run several legalization programs since 2010, beginning with the semi-outdoor regularization framework of Law 3843/2010 and continuing through Law 4014/2011, Law 4178/2013 and Law 4495/2017. Most recently, under Law 5270/2026, the regularization deadline for Categories 1 through 4 was extended to 31 March 2028. The full breakdown of what the extension means for buyers is covered in the guide on illegal constructions Law 5270/2026. These allow owners to declare unauthorized constructions, pay a fine and obtain a regularization certificate.
Under Law 5270/2026, the regularization deadline for Categories 1 through 4 was extended from March 2026 to 31 March 2028. Regularization is not always possible. It depends on the zoning category of the property, the nature and scale of the unauthorized element, current planning regulations applicable to the site, and whether the unauthorized construction breaches setback or height limits that cannot be waived.
Even where regularisation is available, exposure varies considerably. Depending on the infringement, location, use, age, affected area and statutory coefficients, an indicative equivalent can range from a few hundred euros to roughly €2,000 per affected square metre, while total liabilities can reach tens or hundreds of thousands of euros. This is not a universal tariff: a licensed Greek engineer must calculate the statutory fine, applicable reductions or surcharges, eligibility, professional fees and any remedial or demolition exposure for the property.
How to Identify Unauthorized Constructions Before Purchase
Your lawyer will review the permit file. They will not inspect the building. The gap between what the permit shows and what physically exists requires someone on-site who can read architectural drawings, identify discrepancies and assess the scale of exposure.
A step-by-step breakdown of exactly how to run this check is covered in how to check for illegal constructions in Greece before you buy. A property inspection cross-references the approved permit drawings against the physical structure, identifying additions, enclosures, modified footprints and undocumented square meters before you commit.
What Does Remediation Cost?
Costs depend entirely on what is found and whether regularization is viable. Where regularization is not possible, demolition of unauthorized elements may be required, with cost determined by structural complexity. Where regularization changes the permitted scope, updated permits and engineer certifications are required.
None of these costs are reflected in the asking price. All of them are quantifiable before purchase, if identified in time. The buying property in Greece risk checklist outlines the full range of permit and legal risk categories that affect acquisition value.
There is no universal per-square-metre tariff or blanket current 40% surcharge for every declaration. Law 4495/2017 calculations depend on affected area, zone value, use, age, permit status, infringement type and timing. For acquisition-risk screening, exposure may span from a few hundred euros to roughly €2,000 per affected square metre on an indicative equivalent basis, with total liabilities potentially reaching tens or hundreds of thousands of euros. A licensed Greek engineer must calculate the actual amount and eligibility for the specific property.
What a Technical Inspection Will Find That Your Lawyer Won’t
Legal due diligence establishes ownership, encumbrances and title clarity. It does not assess whether the building in front of you corresponds to its permit documentation.
A technical inspection identifies square meter discrepancies between permit and reality, structural elements absent from approved drawings, enclosures and extensions added after original construction, pool and outbuilding permit status, and energy certificate inconsistencies. Combined, these findings give you a negotiating position, a cost estimate and a clear decision: proceed, renegotiate or withdraw.
This is also why lawyers and buyer’s agents in Greece bring in an independent technical advisor rather than rely on the legal check alone.
Where works are planned after purchase, independent construction project management keeps the build aligned with the approved permit drawings, so new deviations from the building permit are not created in the first place.
Before You Sign
Unauthorized constructions are among the most common and most expensive surprises in Greek property transactions. They are also among the most preventable. An independent property inspection commissioned before contract signing costs a fraction of the liability it protects against. We cover all primary acquisition regions in Greece, including Crete, the Ionian Islands, the Peloponnese, Athens, Rhodes and Mykonos.
Buying Property in Greece?
Before contracts are signed, we review permit compliance, Building Identity documentation, physical correspondence between approved drawings and constructed structure, regularisation exposure and deferred capital expenditure risk.
For foreign buyers unable to assess the asset locally, we provide independent property inspections, permit reviews and buyer-side technical due diligence across Greece and the Mediterranean. Every report is in English, delivered before you sign.
Submit the asset location and acquisition details here: kgnordic.com/contact
Before committing, see our technical due diligence guide for Greece and work through the Greece property risk checklist. For investors acquiring at scale, including through the Golden Visa Greece program, a property condition assessment extends that analysis across a ten-year cost horizon. For buyers specifically targeting Crete, the guide on property inspection Crete covers the island’s technical risks including coastal enforcement and location-specific seismic exposure under Greece’s current three-zone classification. For buyers in Athens, read our article on how to choose a property inspector in Athens. Applicants approaching the programme from Dubai and the Gulf will find the purchase-side checklist in our dedicated guide.
Frequently Asked Questions
Q: Can illegal-construction exposure affect the buyer in Greece?
Unresolved unauthorised works and their associated compliance, cost and transferability exposure can remain attached to the property and affect the buyer after acquisition. The exact liability, available remedy and disclosure consequences depend on the property, transaction documents and current law. A licensed Greek engineer and the buyer’s lawyer should verify them before signing.
Q: What are the fines for illegal constructions in Greece?
Depending on the infringement, location, use, age, size and statutory coefficients, regularisation exposure can range from a few hundred euros to roughly €2,000 per affected square metre on an indicative equivalent basis, and total liabilities can reach tens or hundreds of thousands of euros. This is not a universal tariff: a licensed Greek engineer must calculate the property-specific fine, reductions or surcharges, eligibility and any remedial or demolition exposure. Category 5 is a planning classification, not a synonym for coastal construction.
Q: What is the deadline to regularise illegal constructions in Greece?
Article 43(4) of Law 5270/2026 extended the declaration deadline to 31 March 2028 for eligible pre-28 July 2011 Category 1–4 infringements under Law 4495/2017. Eligibility, statutory exclusions and any later legislative change must be checked for the specific property; the deadline does not automatically eliminate every possible remedy or make every violation eligible.
Q: How do I check for illegal constructions before buying property in Greece?
A permit file review cross-checks the physical structure against the original approved plans held by the local planning authority. This is not the same as a standard legal title review and should be commissioned separately as part of a property inspection or technical due diligence mandate.