Illegal Constructions in Greek Property: What Foreign Buyers Must Know Before Signing

Greece has one of the highest rates of unauthorized construction in Europe. Estimates suggest that a significant proportion of properties, particularly villas, island homes and rural plots, contain at least one element built without a valid permit or in excess of approved plans. When you buy, these become your liability.

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 Liability Transfers to the Buyer?

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 5261/2025.

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, most recently under Law 4495/2017 and subsequent amendments. Under Law 5261/2025, 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 5261/2025. These allow owners to declare unauthorized constructions, pay a fine and obtain a regularization certificate.

Under Law 5261/2025, 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 regularization is available, costs vary considerably. Fines under Law 4495/2017 are calculated per unauthorized square metre and building category, ranging from €200 to €2,000 per square metre depending on zone and use. A regularized property still requires verification: the certificate must be current, penalties must be settled and documentation must match the physical building.

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.

Regularization fines are calculated per unauthorized square metre, building category and zone, ranging from €200 to €2,000 per square metre depending on zone and use. Under Law 5261/2025, a 40% surcharge applies to all submissions from October 2024 onward. A 30 square metre unauthorized extension in an Attica zone can generate a regularization fine of €30,000 to €60,000 before legal and engineering costs.

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.

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, the Rhodes and Mykonos.

Property Inspection in Athens

Property Inspection in Rhodes

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 specific technical risks including active coastal enforcement and seismic Zone 4 classification. For buyers in Athens, read our article how to choose a property inspectior in Athens 2026.

Frequently Asked Questions

Q: Do illegal constructions transfer to the buyer in Greece?

Yes. Under Greek law, unauthorised constructions transfer with the title on sale. The buyer inherits both the physical structure and the full regularisation liability, regardless of whether the seller disclosed it.

Q: What are the fines for illegal constructions in Greece?

Regularisation fines run from €200 to €2,000 per square metre depending on zone, building use and construction type. A 40% surcharge applies to all current submissions. Category 5 constructions — typically coastal zone violations — cannot be regularised at all and must be demolished.

Q: What is the deadline to regularise illegal constructions in Greece?

The current regularisation window closes 31 March 2028 under Law 5261/2025. After that date, there is no resolution pathway for unresolved exposures. Properties with open violations after the deadline carry liability with no legal remedy.

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 on file with the local planning authority, a step that also determines EPC eligibility for properties applying to the Anakainizo renovation programme. This is not a standard part of a conveyancing process. it must be commissioned separate as part of a property inspection or technical due diligence mandate.