How to Check for Illegal Constructions in Greece Before You Buy
The enclosed terrace looks like it has always been there. The basement room appears in the listing photos. The pool sits in the garden with no indication it was built without a permit. None of these elements announce themselves as liabilities. They become liabilities the moment the purchase deed is signed and ownership transfers.
Greece has one of the highest rates of unauthorized construction in Europe. The checks that reveal these elements before purchase are not complicated. They require access to specific documents, someone who can read them, and a physical inspection that compares what is approved against what is built. Most buyers skip at least one of these steps. The consequences show up later.
Start With the Building Permit File
Every legally constructed building in Greece has a building permit issued by the relevant local planning authority. The permit file contains the approved architectural drawings, the structural study, the site plan and the permit certificate itself.
Your lawyer can obtain this file from the relevant Urban Planning Office before contracts are signed. Request it early. In practice, obtaining the full permit file can take time depending on the municipality and the age of the building, and delays here compress the due diligence window.
Once you have the file, the approved drawings show exactly what was authorized: the footprint of the building, the number of floors, the square meterage of each floor, the position and dimensions of openings, and any ancillary structures such as garages, storage rooms or pools. Everything built beyond what appears in those drawings is potentially unauthorized.
Cross-Reference the Permit Against the E9 Tax Declaration
Every property owner in Greece declares their property to the tax authority via the E9 form. The E9 records the square meterage of the property as declared for tax purposes. Comparing the E9 declaration against the approved permit drawings reveals whether the declared area matches the approved area.
Discrepancies between the two are a common finding. A property declared at 180 square metres with a permit for 140 square metres has 40 square metres of undeclared area. That area is either unauthorized construction or a square metre calculation that requires explanation. Either way, it requires investigation before purchase.
Your lawyer handles the E9 check as part of standard title due diligence. Confirm explicitly that this comparison is being made, not just that the E9 exists.
Check the Electronic Building Identity
Since 2011, Greek law has required all properties to obtain a Building Identity, known in Greek as the Tautopoiisi Ktiriou, when transferred. This document consolidates the permit status of the property and discloses any outstanding regularization obligations.
The Building Identity does not guarantee the property is fully legal. It records the status at the time of issue and is self-declared by the property owner or their engineer. It should be reviewed alongside the original permit file, not treated as a substitute for it.
Where a Building Identity has not been issued, that is itself a finding. It does not block transfer in all cases, but it signals that the permit status has not been consolidated and requires additional investigation.
Compare the Approved Drawings to the Physical Building
Document review tells you what was approved. It does not tell you what was built. The comparison between the two requires a physical inspection by someone who can read architectural drawings and identify discrepancies on site.
This is the step that most buyers skip entirely, and it is the step where unauthorized constructions are actually found.
A technical inspector walks the property with the approved drawings in hand. They measure the built footprint and compare it to the approved footprint. They identify enclosed spaces that do not appear in the permit. They check whether the pool corresponds to an approved installation or was built informally. They assess whether roof terraces have been enclosed, whether balconies have been glazed in, whether additional rooms have been added above or below the approved envelope.
The property inspection Greece process is specifically designed to perform this comparison, available across Crete, the Ionian Islands, the Peloponnese, Mykonos, Athens and Rhodes. It is a technical function, not a legal one, and it requires someone on site with the drawings in hand, not a desk review.
What Unauthorized Constructions Actually Look Like
Unauthorized constructions are not always obvious. Some are visible the moment you walk the property. Others require the drawings to identify them.
Common findings include enclosed balconies or terraces that appear as interior rooms, additional rooms built in what the permit shows as open covered areas, basement or semi-basement conversions not shown in the approved drawings, pools built without the required permit update, outbuildings and storage structures added after original construction, and additional floors or mezzanines above the approved height.
In older properties, particularly those built before 1990, informal additions accumulated over decades are common. Each ownership transfer that occurred without a technical check passed the liability forward. By the time a foreign buyer acquires the property, the unauthorized elements may be twenty or thirty years old and structurally integrated into the building. Age does not regularize them.
What Regularization Covers and What It Does Not
Greece has run legalization programs for unauthorized constructions under Law 4495/2017, with the current deadline extended to 31 March 2028 under Law 5261/2025. For a full breakdown of what the extension means for buyers, see the guide on Greece illegal constructions Law 5261/2025.These programs allow owners to declare unauthorized elements, pay a calculated fine and obtain a regularization certificate that suspends enforcement action for the duration of the payment period.
Regularization is not available for all unauthorized constructions. Elements that breach absolute limits, such as setback distances from boundaries, coastal zones or protected areas, cannot be regularized regardless of the program. For those elements, the exposure is demolition at the owner's cost.
Where regularization is available, the fine is calculated per unauthorized square metre and per building category. The range under Law 4495/2017 runs from €200 to €2,000 per square metre depending on zone and use. 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.
The full liability framework and what transfers to the buyer on purchase is covered in the article on illegal constructions in Greek property.
The Order of Checks Before You Sign
The sequence matters. Document review first, physical inspection second, legal advice on findings third.
Obtain the building permit file and approved drawings before or immediately after making an offer. Commission a physical inspection that compares the drawings against the building before contracts are exchanged. Have your lawyer review the findings and assess regularization exposure, resale implications and any conditions you should attach to the purchase.
If the seller refuses access for a pre-contract technical inspe[H1] How to Check for Illegal Constructions in Greece Before You Buy
The enclosed terrace looks like it has always been there. The basement room appears in the listing photos. The pool sits in the garden with no indication it was built without a permit. None of these elements announce themselves as liabilities. They become liabilities the moment the purchase deed is signed and ownership transfers.
Greece has one of the highest rates of unauthorized construction in Europe. The checks that reveal these elements before purchase are not complicated. They require access to specific documents, someone who can read them, and a physical inspection that compares what is approved against what is built. Most buyers skip at least one of these steps. The consequences show up later.
Start With the Building Permit File
Every legally constructed building in Greece has a building permit issued by the relevant local planning authority. The permit file contains the approved architectural drawings, the structural study, the site plan and the permit certificate itself.
Your lawyer can obtain this file from the relevant Urban Planning Office before contracts are signed. Request it early. In practice, obtaining the full permit file can take time depending on the municipality and the age of the building, and delays here compress the due diligence window.
Once you have the file, the approved drawings show exactly what was authorized: the footprint of the building, the number of floors, the square meterage of each floor, the position and dimensions of openings, and any ancillary structures such as garages, storage rooms or pools. Everything built beyond what appears in those drawings is potentially unauthorized.
Cross-Reference the Permit Against the E9 Tax Declaration
Every property owner in Greece declares their property to the tax authority via the E9 form. The E9 records the square meterage of the property as declared for tax purposes. Comparing the E9 declaration against the approved permit drawings reveals whether the declared area matches the approved area.
Discrepancies between the two are a common finding. A property declared at 180 square metres with a permit for 140 square metres has 40 square metres of undeclared area. That area is either unauthorized construction or a square metre calculation that requires explanation. Either way, it requires investigation before purchase.
Your lawyer handles the E9 check as part of standard title due diligence. Confirm explicitly that this comparison is being made, not just that the E9 exists.
Check the Electronic Building Identity
Since 2011, Greek law has required all properties to obtain a Building Identity, known in Greek as the Tautopoiisi Ktiriou, when transferred. This document consolidates the permit status of the property and discloses any outstanding regularization obligations.
The Building Identity does not guarantee the property is fully legal. It records the status at the time of issue and is self-declared by the property owner or their engineer. It should be reviewed alongside the original permit file, not treated as a substitute for it.
Where a Building Identity has not been issued, that is itself a finding. It does not block transfer in all cases, but it signals that the permit status has not been consolidated and requires additional investigation.
Compare the Approved Drawings to the Physical Building
Document review tells you what was approved. It does not tell you what was built. The comparison between the two requires a physical inspection by someone who can read architectural drawings and identify discrepancies on site.
This is the step that most buyers skip entirely, and it is the step where unauthorized constructions are actually found.
A technical inspector walks the property with the approved drawings in hand. They measure the built footprint and compare it to the approved footprint. They identify enclosed spaces that do not appear in the permit. They check whether the pool corresponds to an approved installation or was built informally. They assess whether roof terraces have been enclosed, whether balconies have been glazed in, whether additional rooms have been added above or below the approved envelope.
The property inspection Greece process is specifically designed to perform this comparison. It is a technical function, not a legal one, and it requires someone on site with the drawings in hand, not a desk review.
What Unauthorized Constructions Actually Look Like
Unauthorized constructions are not always obvious. Some are visible the moment you walk the property. Others require the drawings to identify them.
Common findings include enclosed balconies or terraces that appear as interior rooms, additional rooms built in what the permit shows as open covered areas, basement or semi-basement conversions not shown in the approved drawings, pools built without the required permit update, outbuildings and storage structures added after original construction, and additional floors or mezzanines above the approved height.
In older properties, particularly those built before 1990, informal additions accumulated over decades are common. Each ownership transfer that occurred without a technical check passed the liability forward. By the time a foreign buyer acquires the property, the unauthorized elements may be twenty or thirty years old and structurally integrated into the building. Age does not regularize them.
What Regularization Covers and What It Does Not
Greece has run legalization programs for unauthorized constructions, most recently under Law 4495/2017. These programs allow owners to declare unauthorized elements, pay a calculated fine and obtain a regularization certificate that suspends enforcement action for the duration of the payment period.
Regularization is not available for all unauthorized constructions. Elements that breach absolute limits, such as setback distances from boundaries, coastal zones or protected areas, cannot be regularized regardless of the program. For those elements, the exposure is demolition at the owner's cost.
Where regularization is available, the fine is calculated per unauthorized square metre and per building category. The range under Law 4495/2017 runs from €200 to €2,000 per square metre depending on zone and use. 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.
The full liability framework and what transfers to the buyer on purchase is covered in the article on illegal constructions in Greek property.
The Order of Checks Before You Sign
The sequence matters. Document review first, physical inspection second, legal advice on findings third.
Obtain the building permit file and approved drawings before or immediately after making an offer. Commission a physical inspection that compares the drawings against the building before contracts are exchanged. Have your lawyer review the findings and assess regularization exposure, resale implications and any conditions you should attach to the purchase.
If the seller refuses access for a pre-contract technical inspection, that refusal communicates something. A seller with a clean property has no reason to obstruct a technical check.
For buyers acquiring at investment scale, particularly those using the property as a Golden Visa qualifying asset or as part of a portfolio, a technical due diligence mandate covers the full scope: permit verification, physical inspection, regularization cost estimation and a written findings report in English structured for acquisition decision-making.
What You Are Actually Buying
The Greece property risk checklist covers the full range of technical and legal risk categories that affect foreign buyer acquisitions. Unauthorized construction is consistently among the highest-frequency findings and among the most expensive to resolve post-purchase.
The checks described here take time and cost money. They cost considerably less than the alternative, which is discovering the unauthorized elements after the deed is signed, when the leverage to act on them is gone and the liability is yours. For non-EU buyers transacting remotely or without a local network, the guide on Greek property due diligence for non-EU buyers covers how to structure the full pre-purchase process independently.
Before instructing an inspection, the Greece property risk checklist provides a 21-point framework of what independent verification should cover.