What Does a Civil Engineer Check Before You Buy Property in Greece?
Before you buy a Greek property, an independent engineer can compare the actual construction with approved permits and plans, investigate alterations and Electronic Building Identity documents, and inspect visible physical conditions to an agreed scope. Building legality, visible condition and structural adequacy are different questions. Neither a permit nor an HTK completeness certificate guarantees that every hidden defect has been found.
The three layers of an independent engineering review
A buyer-appointed engineer should distinguish documented construction, physical condition, and future-use or transfer questions. The seller's engineer may already be preparing transfer documentation, but that is not automatically a comprehensive condition survey for the buyer.
| Review | Typical evidence | Important limit |
|---|---|---|
| Building documentation | Original permits, revisions, approved plans and alterations | Does not prove absence of physical defects |
| Site condition | Inspection, photographs and any agreed tests | Concealed structure and systems may be unexamined |
| Readiness for transfer or works | HTK and permit/planning information | Does not grant all future building permission |
Agree in writing what the engineer will examine and what requires an additional specialist.
How are permits and approved plans checked?
A Greek building permit — οικοδομική άδεια — can document original authorised construction. It does not prove every later extension, conversion or structural change was approved.
The engineer should obtain relevant approved floor plans, permit amendments and available building documents, then compare their layout with the actual apartment or house. The Ministry of Environment describes the modern e-Άδειες system; older buildings may also require archive records.
A difference can indicate a lawful amendment, a documented irregularity, a measurement-definition issue or an unresolved change. Do not treat every mismatch as automatic evidence of illegality.
Which alterations deserve specific attention?
Examples include enclosed balconies, basement storage converted into living space, additional garden buildings, modified internal walls and altered structural elements.
The engineer should establish when the works occurred, whether an applicable permit exists and whether any relevant regularisation procedure was used. Law 5306/2026, Article 383 addresses categories of qualifying older unauthorised construction, but its existence does not show that every alteration is eligible.
A declaration number should be checked against the exact works it covers, its statutory category and procedural status. See Illegal and Unauthorised Construction.
What does the Electronic Building Identity add?
The Electronic Building Identity (HTK) provides relevant technical building documentation through a TEE-operated system. The Certificate of Completeness is a formal output of that process.
Gov.gr states that an authorised engineer can issue the certificate after finalising the registration, performing a site visit and paying the applicable fee.
This statutory visit does not automatically establish the condition of the concealed foundations, wiring, drains or roof. Ask whether the HTK file refers to the correct apartment, reflects alterations and contains the records that should apply to that property.
For the documentary process, read Electronic Building Identity Explained.
How should advertised floor area be compared with the plans?
Ask the engineer to distinguish documented main spaces — κύριοι χώροι from auxiliary spaces — βοηθητικοί χώροι where relevant. Advertised total area can combine areas not suitable for an identical €/m² comparison with verified main residential space.
Worked example: a 92 m² apartment
A fictional apartment is offered for €276,000 with 92 m² advertised. The plans identify 78 m² main residential space and an additional 14 m² enclosure whose status has not yet been established.
| Area denominator | Asking price per m² |
|---|---|
| 92 m² advertised | €3,000/m² |
| 78 m² documented main | Approximately €3,538/m² |
These are two mathematical descriptions of the seller's asking price, not competing estimates of market value. The engineer must assess the enclosure before the buyer treats the full 92 m² as verified main residential accommodation.
Illustrative fictional property, price and measurements.
What can an inspection find about condition?
The agreed visit can identify visible cracking, water staining, corrosion, roof or balcony deterioration, damp, drainage concerns, altered elements and accessibility limitations.
| Observation | Professional next question |
|---|---|
| Crack in wall | Is further structural investigation warranted? |
| Damp stain | Is the cause known or does it require investigation? |
| Damaged balcony concrete | Is corrosion or another defect involved? |
| Roof waterproofing concerns | Can the roof be inspected and potential causes assessed? |
| Recently refurbished interior | Have concealed building systems actually been tested? |
| Changed layout | Is the physical configuration consistent with relevant plans? |
A visual visit can identify warning signs. It cannot reliably establish every hidden defect, or certify seismic performance and structural safety without an appropriately scoped engineering analysis.
Greece is seismically active, but a building's age alone does not determine its earthquake resistance. Ask what documents, calculations and tests are needed if seismic condition is a material buying concern.
Are electrical, plumbing and heating systems included?
Not automatically. Detailed electrical testing, plumbing investigation, HVAC performance testing, lift inspection or drainage checks may require specifically qualified professionals.
Ask the buyer's engineer which systems they will visually observe, which they will test, and which are outside scope.
A PEA Energy Performance Certificate concerns a different question: energy performance under the KENAK framework. It does not certify every building system or promise a particular annual utility bill.
Does the engineer check planning and future building rights?
If the buyer plans an extension, significant renovation or new structure, planning feasibility may be essential. A legal existing building does not automatically mean permission exists for a second house or extra floor.
The TEE Single Digital Map provides layers about planning and protected areas, but the professional must establish which rules apply to the exact parcel and intended works. A screen-based map view is not a building permit.
A worked inspection scenario: renovated island apartment
A fictional apartment is marketed for €295,000. Its finishes look new. The engineer finds water staining, a partly documented enclosed area and pending HTK paperwork. Wiring inside the walls has not been examined.
The appropriate findings are separate: documentary status of the enclosed area, visible moisture requiring investigation, concealed electrical condition outside scope, and pending transfer documentation.
That is more useful than either “everything looks fine” or “the whole apartment is illegal.” Both claims would overstate the evidence.
What should the engineer's report contain?
| Report section | Minimum useful answer |
|---|---|
| Property and inspection date | Exact unit and date inspected |
| Scope and exclusions | What was inspected, measured, tested, or not accessed |
| Document inventory | Permits, plans, alteration records, HTK |
| Layout and area | Documented compared with observed; area definitions |
| Visible condition | Photographs and specific observations |
| Specialist referrals | Structural, electrical, waterproofing or other |
| Outstanding documents | Which sources remain missing |
| Buyer consequences | What is verified, pending or materially problematic |
This is a suggested reporting framework, not an official government certificate.
When should the inspection occur?
As early as practicable, before the buyer accepts an inadequately protected financial commitment. Some transfer certificates will be prepared closer to the deed; this does not justify postponing investigation of material visible or documentary concerns.
If a deposit is requested before work is complete, the buyer's lawyer should explain how the actual agreement treats unfinished checks and withdrawal. The engineer should give an explicit account of what is still unknown.
Frequently asked questions
Does a building permit prove everything is legal?
No. It describes specific authorised works, not every later alteration.
Does HTK prove structural safety?
No universal guarantee follows from the certificate. Structural adequacy may require a separately scoped study.
Does an inspection check hidden wiring?
Not unless appropriate testing is included and performed by a suitably qualified professional.
Can an enclosed balcony be lawful?
Potentially; the engineer must check the applicable approvals and documents rather than infer status from appearance.
What a good engineering investigation achieves
A buyer does not need a vague “pass” or “fail.” They need to know what the documents show, what was physically observed, what was not checked and what requires further action.
The Greek Property Report provides independent buyer-funded research and receives no brokerage commission or closing-contingent fee. We do not certify construction legality, structural safety, legal title or individual property value.
Understand the evidence, and what still needs checking
Our methodology explains what independent, buyer-funded research can establish—and what must be verified by a Greek lawyer, engineer or notary.
Independent, buyer-funded research. No brokerage commission or fee contingent on a completed purchase. Not a professional valuation, legal opinion or engineering assessment.