Greece Property Engineer Certificate: Complete 2026 Guide

Quick answer: Every Greek property sale legally requires an Electronic Building Identity, prepared by a licensed engineer who verifies the building permit, measures usable area, and documents any regularised unauthorised construction. For Golden Visa buyers, the engineer’s certificate is the only document that officially confirms whether the property meets the 120m² minimum under Circular 1/2026. Engineer surveys cost €300 to 800 and must be commissioned before you sign a preliminary agreement or pay a deposit.

Greece has one of the highest rates of unauthorised construction in the EU. Successive regularisation amnesty laws have legitimised many of these additions, but the resulting title histories are complex: a property may have several phases of construction across different permits, partial regularisations, and areas that are physically present but not legally counted toward usable floor area. The engineer’s certificate is the instrument that cuts through this complexity with a single authoritative measurement.

For Golden Visa buyers, the stakes are higher still. Under the 2023 reform and Circular 1/2026, the €250,000 conversion route requires both a minimum 120m² of certified usable area and a classification certificate confirming residential use. An error in either document delays, and can disqualify, the residency application.

This guide explains how the engineer certificate and Electronic Building Identity work, what the 120m² rule actually measures, how Circular 1/2026 classification works, how to handle unauthorised construction findings, what red flags to watch for, and what the full process costs.

For the broader purchasing framework, see How to Buy Property in Greece as a Foreigner. For the complete due diligence checklist, see Due Diligence Greece Property.

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What Is the Electronic Building Identity and Why Is It Mandatory

The Electronic Building Identity (Ηλεκτρονική Ταυτότητα Κτιρίου) is the legal dossier that must exist before a property can be transferred. It bundles the original building permit and every subsequent modification, the engineer’s current measurement report comparing the physical building against what was permitted, the energy performance certificate, documentation of any regularised unauthorised construction, and any relevant planning or court decisions. It attaches to the building rather than the owner, so it transfers with the property. What the Electronic Building Identity contains:

• The original building permit and all subsequent modification permits
• The engineer’s current measurement report confirming physical state versus permitted state
• The energy performance certificate (EPC)
• Documentation of any regularised unauthorised construction
• Any relevant court decisions or planning authority decisions affecting the property

The identity is tied to the building, not the owner. When a property changes hands, the identity transfers with it. The new owner can request amendments if subsequent modifications are made.

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The Engineer’s Role: What the Survey Actually Covers

Two of the six survey elements decide whether a Golden Visa purchase works at all. The certified usable area (emvadon) establishes compliance with the 120 m² threshold, and the balcony and veranda classification determines whether enclosed space counts toward it. The rest, permit comparison, regularisation status, Electronic Building Identity preparation, and basement classification, determine whether the property can legally transfer and what it will cost to make it transferable. The engineer survey is not a structural or condition report in the UK or US sense. A Greek licensed civil engineer (πολιτικός μηχανικός or αρχιτέκτων μηχανικός) focuses on planning compliance: does the physical building match what was approved?

The engineer visits the property, physically measures every space, and cross-references the measurements against the permit drawings. In older buildings, anything constructed before 1985, this often involves visiting the regional Urban Planning Office (Poleodomia) in person to locate physical permit archives.

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The Electronic Building Identity (Ηλεκτρονική Ταυτότητα Κτιρίου) is the digital file a licensed Greek engineer opens for a property, recording its permits, plans, energy performance certificate, any regularised planning violations, and the measured area of each space classified as main use or auxiliary. It is mandatory for any transfer, so no notary will execute a deed without it. For a foreign buyer its significance is that it, rather than the listing or the title deed, is the document that decides Golden Visa eligibility: the Ministry counts only the main habitable usable area (κύρια χρήση) recorded there. A property marketed at 164 square metres can certify at 112 once 22 square metres of balconies, 12 of parking and 18 of auxiliary basement are excluded, and 112 fails a rule that has no rounding and no discretion in it.

The 120 m² Rule: What Actually Counts

The short version: enclosed permitted living space counts, everything else does not. Living rooms, bedrooms, kitchen, bathrooms, internal hallways and permitted enclosed verandas all count toward the 120 m². Open balconies and terraces, parking spaces, storage rooms, unpermitted basements, non-habitable attics and building common areas never do. This is why a listing advertised at 145 m² of built area can certify at 112 m² of usable area and fail the test outright. Under the Golden Visa 120m² minimum, not every square metre of a property counts. Understanding the distinction between total built area and usable floor area (emvadon) is critical before making an offer.

What typically counts toward the 120m² usable area:

• Living rooms, dining rooms, bedrooms
• Kitchen
• Bathrooms and WC
• Hallways and internal corridors
• Enclosed verandas with permits

What typically does not count toward 120m²:

• Open balconies and terraces
• Parking spaces
• Storage rooms (apothekes)
• Basements without residential permit classification
• Attics and roof spaces not classified as habitable
• Common areas of the building

This distinction means a property marketed as “135m²” by an estate agent may have a certified usable area of only 108m² once the engineer excludes balconies and storage. This is not fraudulent marketing, Greek agents commonly quote total built area rather than usable area. But it can disqualify an apparently compliant property from the €250,000 Golden Visa tier.

For a full analysis of the 120m² requirement and its implications, see Greece Golden Visa 120m² Rule.

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Circular 1/2026: The Classification Certificate Explained

Circular 1/2026 formalised the documentation requirements for the €250,000 conversion route, properties converted from non-residential (commercial, warehouse, office) to residential use. The classification certificate is the document that proves this conversion has been legally completed.

What the classification certificate confirms:

1. The property was previously classified as non-residential under the Urban Planning records
2. The reclassification to residential use was approved by the competent regional authority
3. The reclassification dossier was correctly submitted and accepted by the Poleodomia
4. The building identity has been updated to reflect the new residential classification

How the classification certificate is obtained:

The engineer prepares a technical dossier supporting the reclassification application, which is submitted to the regional Urban Planning Office. The timeline for approval varies by municipality: Athens and Thessaloniki typically process applications within 4 to 8 weeks; smaller regional offices can take 3 to 5 months. The engineer tracks the application and collects the issued certificate once approved.

What happens without the classification certificate:

Without the certificate, the property does not qualify for the €250,000 conversion tier. The buyer’s investment then falls under the standard residential tiers: €400,000 in low-demand zones or €800,000 in Athens, Thessaloniki, Mykonos, and Santorini. This difference of €150,000 to €550,000 is not a paperwork technicality, it is the investment economics of the entire transaction.

For the full breakdown of how Circular 1/2026 affects Golden Visa applications, see Greece Golden Visa Circular 2026 Explained.

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Unauthorised Construction: What the Engineer Finds and What to Do

Unauthorised construction (αυθαίρετες κατασκευές, authentirytes kataskeyes) is found in a substantial proportion of Greek properties, particularly those built or modified between 1955 and 2000 when planning enforcement was inconsistent. The engineer survey surfaces this; what matters is what type of unauthorised construction it is and whether it has been or can be regularised.

Common unauthorised construction findings:

• Enclosed balconies added without a permit modification
• Additional rooms created by subdividing spaces
• Roof terraces with structures built without separate permits
• Basement areas converted to habitable rooms
• Mezzanine levels added within high-ceilinged spaces
• External additions (pergolas, storage extensions, sunrooms)

The regularisation framework:

Greece has passed multiple amnesty laws, most recently extended and amended through Law 4843/2021 and subsequent ministerial instruments, that allow property owners to legalise existing unauthorised construction on payment of a fine calculated on the type, size, and age of the unauthorised works. Regularised construction is formally incorporated into the building identity dossier.

Red flags that require escalation:

• Unauthorised construction affecting structural elements (load-bearing walls, foundations)
• Demolition orders (κατεδαφιστέα) recorded at the Urban Planning Office
• Regularisation applications filed but not yet approved
• Building identity showing a total area substantially larger than the permit drawings
• Estate agent’s floor plan showing spaces not reflected in any permit

If the engineer identifies unregularised construction of any significance, the matter must be resolved before you pay a deposit. For what to watch for across the full purchase process, see Greece Golden Visa Mistakes to Avoid.

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When to Commission the Engineer Survey

Commission it after the cadastre extract confirms clean registration and you have seen the existing permits, but before the reservation deposit. Running it in parallel with the lawyer’s title review is the standard sequence: both take days, and both surface problems that take months. The instinct to save the survey fee until a deal feels certain is exactly backwards, because the survey is what tells you whether the deal can exist. Timing the engineer survey correctly saves both money and risk.

Commission the survey immediately when:

• The initial due diligence (title search and cadastre check) returns clean results
• You have received a draft preliminary agreement from the seller
• The seller’s asking price is consistent with the 120m² threshold you need
• The property’s age or description suggests previous modifications

Do not commission the survey until:

• Your lawyer has confirmed the title search is clear of serious encumbrances
• The cadastre extract confirms the property is correctly registered
• You have seen the existing building permits and there are no obvious major permit gaps

Commissioning the survey in parallel with the legal due diligence tracks is the standard approach. Both take 3 to 10 working days, so running them sequentially adds 3 to 10 days to a transaction with no benefit.

Never sign a preliminary agreement before the survey is complete. A preliminary agreement (sinallagmatiki) is legally binding in Greece. If you sign before the engineer confirms the 120m² minimum, or before unauthorised construction findings are known, you have limited legal leverage to renegotiate or withdraw without losing your deposit.

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Engineer Certificate Cost Breakdown

These are engineer-only fees. They do not include the Urban Planning Office filing fees (typically €50 to 200), or the energy performance certificate (typically €200 to 400 if not already current).

The engineer fee is non-negotiable in the sense that cutting costs here is disproportionately risky. A €300 to 800 survey that identifies a 12m² shortfall in usable area, or a demolition order on an enclosed balcony, saves tens of thousands of euros in either wasted investment or renegotiation leverage.

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An engineer survey costs €300 to €800 for a standard apartment and €500 to €1,500 for a villa or a multi-plot purchase, which on a €400,000 acquisition is between 0.08% and 0.375% of the price. Against that, the certificate is the document that decides whether a Golden Visa file survives: it records the main habitable usable area on which the 120 square metre rule turns, and it is where unpermitted works surface. Regularisation of those works is charged separately and is not small: a 20 square metre unauthorised veranda in a coastal zone runs €2,000 to €4,000 in fines plus the engineer’s time to process the paperwork, and the process takes four to eight weeks minimum. Sellers usually settle regularisation themselves, but the delay is the buyer’s problem if bridge finance is running.

When to pause the transaction

Three findings are stop signals rather than negotiating points. Usable area below 120 m² before any exclusions means the property cannot meet the Golden Visa threshold whatever the floor plan says. An active demolition order on any part of the building carries structural legal risk that a price reduction does not cure. And unregularised construction in the main habitable spaces cannot be counted toward area and may have to be demolished or legalised before transfer. Certain findings in the engineer survey require you to pause and seek specific legal advice before proceeding:

• Usable area below 120m² before any exclusions, the property cannot meet the Golden Visa threshold regardless of what is on the floor plan
• Active demolition order, any part of the property subject to a demolition order carries structural legal risk
• Unregularised construction in the main habitable spaces, these areas cannot be counted and may need to be demolished or regularised before transfer

For a broader view of what goes wrong and how to avoid it, see Greece Golden Visa Mistakes to Avoid.

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Frequently Asked Questions

Almost every question below resolves to a document rather than to a judgement call, and the document is what the notary and the Ministry of Migration actually read: the Electronic Building Identity, the engineer’s certified area figure, the building permit history, and the regularisation record. Where a seller cannot produce one of those, that absence is the answer. The questions below come up on almost every foreign purchase. Each one has a document answer rather than an opinion answer, and the document is what the notary and the Ministry actually read.

Buyer scenarios

Frequently Asked Questions

What is the engineer certificate required for Greek property? +

The engineer certificate for Greek property is an official technical report prepared by a licensed Greek civil engineer (mēchanikos) confirming that the property's physical state matches its approved building permit, and that the recorded usable area (emvadon) is accurate. For Golden Visa purchases it is mandatory, because the 120m² minimum applies to the usable area verified by the engineer, not the cadastre extract or estate agent's floor plan. The certificate is separate from the Electronic Building Identity, though both are prepared by the same engineer at the same time. Costs range from €300 to €800 depending on property size and complexity.

What is the Electronic Building Identity (Taftotita Ktiriou) in Greece? +

The Electronic Building Identity (Ταυτότητα Κτηρίου) is a digital dossier introduced under Law 4495/2017 that consolidates a building's complete planning and construction history into a single registered record. It includes the original building permit, all subsequent permits and modifications, the engineer's measurement report, energy performance certificate, and any regularisation documents for unauthorised construction. Since January 2021 it is legally required for any property transaction involving a transfer of ownership. A property cannot be sold without an active Electronic Building Identity, and preparing one for older buildings is commissioned as part of the pre-sale engineer survey.

How does the 120m² rule work for Greece Golden Visa in 2026? +

Under Circular 1/2026 and the 2023 Golden Visa reform, buyers investing in the €250,000 conversion tier must ensure the property meets a minimum usable area of 120m². The 120m² threshold applies to the usable floor area as certified by a licensed Greek engineer, not the total built area or the figure in an estate agent's listing. Areas such as basements, parking, storage rooms, open balconies, and attics typically do not count toward the 120m² usable minimum. The engineer's certificate issued as part of the Electronic Building Identity process is the document that establishes this figure officially.

What does Circular 1/2026 classification certificate mean for property buyers? +

Circular 1/2026 introduced a mandatory classification certificate for properties applying under the €250,000 Golden Visa conversion route, confirming that the building has been legally reclassified from a non-residential to residential use. The certificate is issued by the competent regional Urban Planning Office (Poleodomia) after the engineer submits the reclassification dossier. Without this classification certificate the property does not qualify for the €250,000 investment threshold; instead, it falls under the standard €400,000 or €800,000 residential tiers depending on zone. The engineer prepares and files the supporting technical documentation.

What unauthorised construction issues does an engineer find in Greece? +

Greek engineer surveys routinely identify unauthorised construction, locally called 'authentiryta'. Common findings include: enclosed balconies or verandas added without permits, additional rooms created by subdividing spaces, roof terraces with unauthorized superstructures, basement rooms converted to habitable space, and internal wall alterations. Greece has passed multiple regularisation amnesty laws allowing owners to legalise such works on payment of a fine. Regularised construction counts toward the total built area but may not count toward the 120m² usable floor area for Golden Visa purposes, the engineer determines which areas qualify.

How much does an engineer survey cost in Greece and what does it include? +

An independent engineer survey for a Greek property purchase costs between €300 and €800. The lower end applies to smaller apartments under 80m² in urban areas with clear permit histories. The higher end applies to larger properties, villas, island locations, older buildings requiring extensive permit research, or properties with regularised unauthorised construction. The fee covers: physical inspection and measurement verification, building permit compliance check, preparation or update of the Electronic Building Identity dossier, and the formal measurement certificate used by the notary. For Golden Visa applications requiring Circular 1/2026 classification, an additional filing fee for the Urban Planning Office submission may apply.

When in the buying process should I commission a Greek engineer survey? +

You should commission the engineer survey before signing any preliminary purchase agreement (sinallagmatiki symvasi) or paying a deposit. The survey findings directly affect your purchase decision, negotiating position, and, for Golden Visa buyers, whether the property qualifies under your intended investment tier. If the survey reveals significant unauthorised construction, a 120m² shortfall, or an incomplete or incorrect Electronic Building Identity, you need that information before you are legally committed. Most Greek lawyers instruct the engineer immediately after the initial due diligence check confirms a clean title and cadastre position, allowing both processes to run in parallel.