By DC Engineers | Architecture, Engineering & Construction

The Greek building permit system is one of the most frequently misunderstood aspects of property acquisition and development for foreign buyers. Transactions are delayed, renovation projects stalled, and investments compromised — often because the buyer did not understand, at the outset, what the permit process requires and what it means for their specific property.

This article provides a systematic explanation of how building permits work in Greece, what is required to obtain one, and what foreign buyers must verify regarding the permit status of any property they are considering.

Why Building Permits Matter More in Greece

In many countries, a building permit is a procedural formality — important, but rarely a source of significant legal or financial risk for a buyer of an existing property. In Greece, the situation is materially different.

Decades of incomplete enforcement have left a significant proportion of the Greek building stock in a state of partial or full non-compliance with their original permits. Additions were built without authorisation. Approved plans were not followed. Permits were obtained but constructions were never formally completed and registered.

The consequences for a buyer who acquires such a property without due diligence can include: inability to resell, inability to obtain financing, mandatory demolition orders, and substantial regularisation fines. These are not theoretical risks — they arise in transactions regularly.

Understanding the permit system is therefore a prerequisite for any informed acquisition or development decision in Greece.

Part One: The Building Permit

What It Is

A building permit is the authorisation issued by the competent Urban Planning Office of the relevant municipality, permitting the construction, renovation, or alteration of a building in accordance with a specific set of approved studies.

The permit is the legal instrument that defines what may be built, on which plot, to what dimensions, and according to which technical specifications. Any construction that deviates from the approved permit — in footprint, height, use, or any other material respect — constitutes an arbitrary construction.

What It Contains

A complete building permit package includes:

• The permit decision document, specifying the owner, plot, and authorised scope of works
• The approved architectural plans (floor plans, elevations, sections)
• The structural study and calculations
• The electromechanical studies
• The energy efficiency study
• The topographic survey
• The engineer responsibility declarations

All studies are signed and sealed by licensed Greek engineers. The permit is issued to the property owner and is associated with the specific plot by cadastral reference.

Who Issues It

Building permits are issued by the Urban Planning Office of the municipality in which the property is located. For projects in traditional settlements or areas of architectural sensitivity, additional review by the local Architectural Council is required prior to permit issuance.

Part Two: Categories of Works and Required Authorisation

Not all construction works require a full building permit. Greek law defines several categories of works with different authorisation requirements.

Works Requiring a Full Building Permit

• New building construction
• Extensions to existing buildings (increase in floor area or volume)
• Change of use of a building or part thereof
• Demolition of a building
• Any structural intervention to an existing building

Works Requiring a Small-Scale Works Approval

This is a simplified authorisation for defined minor works, including:

• Roof repairs and replacement of roofing materials
• Repair or replacement of external cladding and openings
• Internal non-structural partitioning
• Installation of heating, cooling, and solar systems within defined parameters
• Swimming pool construction within specific size limits

Works Requiring Only Notification

Certain minor maintenance works may proceed following notification to the planning authority, without advance approval.

Works Requiring No Authorisation

Minor internal maintenance and decoration works that do not affect the structure, external appearance, or building systems.

Important: The categorisation of specific works is not always straightforward, and misclassification — proceeding under a lower category than the works actually require — is a common source of arbitrary construction status. When in doubt, the classification must be confirmed by a licensed engineer before works commence.

Part Three: The Permit Application Process

Required Studies and Documents

A full building permit application requires the following, all prepared and signed by licensed Greek engineers of the relevant specialties:

• Topographic survey by a licensed topographer
• Architectural study
• Structural study
• Electrical installation study
• Plumbing and sanitary study
• Heating, ventilation, and air conditioning study
• Energy efficiency study
• Fire protection study (for applicable building categories)
• Fuel gas study (where applicable)
• Survey plans confirming plot boundaries and existing conditions

Foreign architects and engineers may not sign Greek building permit submissions. All studies must be prepared by, or co-signed by, professionals licensed by the relevant Greek engineering chamber.

Submission and Review

Applications are submitted electronically through the national e-permit platform. The reviewing Urban Planning Office assesses the submission for completeness and regulatory compliance. Requests for supplementary information or corrections are issued in writing and must be addressed within defined timeframes.

Timelines

Permit issuance timelines vary considerably by municipality, project complexity, and current workload of the planning office. As a realistic planning guide:

• Straightforward residential projects in standard zones: three to six months from complete submission
• Projects in traditional settlements requiring ΕΠΑΕ review: six to twelve months, depending on the scheduling of council sessions and the number of revision rounds required
• Projects requiring environmental impact assessment or other special approvals: variable, and should be assessed case by case with legal and engineering advice

These are working timelines, not guarantees. Budget for delays, particularly when project commencement is time-sensitive.

Permit Validity

A building permit is valid for four years from the date of issuance, with the possibility of a single extension of an additional four years, subject to conditions. If construction is not completed within the validity period, the permit lapses and a new application is required.

Part Four: The Electronic Building Identity

Introduced under Law 4495/2017, the Electronic Building Identity is a mandatory digital record for all buildings in Greece. It consolidates, in a single electronic file, all documentation relating to a building's legal and technical status:

• Original building permit and all subsequent permits or approvals
• As-built architectural plans reflecting the current state of the property
• Energy Performance Certificate
• Structural adequacy assessment
• Inspection records

For new buildings, the Electronic Building Identity must be established prior to completion and registration. For existing buildings, it is required at the point of any transaction or major intervention.

The Building Identity serves as the definitive legal record of a property's compliance status. For a buyer, its existence and completeness is a significant indicator of a well-documented property. Its absence or incompleteness warrants investigation.

Part Five: Arbitrary Constructions — The Regularisation Framework

As noted, a substantial proportion of Greek properties contain elements constructed without authorisation or in deviation from their approved permit. The current legal framework for addressing these is Law 4495/2017.

What Can Be Regularised

The law permits the regularisation of arbitrary constructions that meet defined criteria, primarily relating to when they were constructed and their nature. Regularisation involves:

• Declaration of the arbitrary element through the online platform
• Payment of a regularisation fine, calculated on the basis of the element's area, use, and location
• Suspension of any demolition obligation for the duration of the regularisation

Regularisation does not make an arbitrary construction legal in the full planning sense — it suspends the demolition obligation and allows the property to be transacted. This distinction is important.

What Cannot Be Regularised

Certain categories of arbitrary construction cannot be regularised under any circumstances, including:

• Constructions in forest areas, archaeological buffer zones, or coastal protection zones
• Constructions that exceed the buildable area of the plot beyond defined thresholds
• Constructions that pose a demonstrated structural safety risk

Properties with non-regularisable arbitrary elements carry permanent legal encumbrance. Acquisition of such a property without full understanding of the implications is a material risk.

Buyer Obligations

When a property with regularised arbitrary constructions is sold, the buyer must be formally informed of their existence and nature. The regularisation fine may be paid as a lump sum or in instalments; outstanding instalments transfer to the new owner unless cleared prior to completion.

The verification of a property's arbitrary construction status — and the completeness of any regularisation — is a non-negotiable element of pre-purchase due diligence.

Part Six: Verifying Permit Status — What to Request Before You Buy

For any existing property under consideration, the following documentation must be obtained and reviewed by your engineer and lawyer before any commitment is made:

1. Original building permit and all subsequent permits, approvals, and modifications
2. Approved architectural plans — to be cross-referenced against the current physical state of the property
3. Arbitrary construction declarations, if any, with evidence of regularisation status and outstanding fine balances
4. Electronic Building Identity, if established
5. Completion certificate (Βεβαίωση Περαίωσης) or equivalent, confirming that permitted works were formally closed

If the seller is unable to produce the original building permit, it can be retrieved from the issuing Urban Planning Office — though retrieval timelines vary and the archive quality of older offices is not uniform.

The absence of documentation is not a reason to proceed with caution. It is a reason to stop until documentation is obtained.

Part Seven: Renovation and Alteration — Permit Requirements for Buyers

Foreign buyers who intend to renovate an existing property must understand that virtually any substantive alteration requires prior authorisation. The following are among the most commonly misunderstood points:

• Removing a wall — if structural or if it affects the building's fire compartmentation, a permit or approval is required
• Adding a bathroom or kitchen — changes to drainage and water supply installations require authorisation
• Changing external openings — replacement of windows and doors in a different size or position requires approval, particularly in traditional settlements
• Converting a basement or storage space to habitable use — this constitutes a change of use and requires a full permit
• Adding a swimming pool — requires authorisation; the category depends on dimensions and location

Proceeding with any of these works without the required authorisation creates a new arbitrary construction status on the property, with all associated consequences.

Summary

The Greek building permit system is comprehensive, well-defined, and — when navigated correctly — entirely manageable. The risks it presents to uninformed buyers arise not from the system itself, but from the gap between what has been built and what has been authorised.

For any property acquisition or development project in Greece, verification of permit status and compliance is an essential professional exercise, conducted by qualified engineers and lawyers before any financial commitment is made.

DC Engineers — Permit Processing and Technical Advisory for International Clients

DC Engineers manages the complete building permit process for international clients undertaking construction or renovation projects in Greece — from initial feasibility assessment and study preparation through to permit issuance and construction supervision. We also conduct pre-purchase permit verification as part of our technical due diligence service.

All client communication is conducted in English.

This article is provided for informational purposes and does not constitute legal advice. Permit requirements are subject to legislative change; readers are advised to confirm current requirements with a qualified professional at the time of their project.