Building Permit Due Diligence in Greece: What to Verify Before You Buy

A buyer's lawyer in Athens confirms the title is clean: no liens, no inheritance gaps, no disputes. Three weeks after completion, an engineer measuring for a renovation finds the house is 38 square meters larger than anything in its permit file. The title was perfect. The building was not. In Greece those are two separate investigations, and the second one, building permit due diligence, is the one nobody in the standard transaction is paid to perform.

Permit verification is the core of buyer-side technical due diligence in the Greek market, and it is the element most specific to Greece: an independent engineering advisory working for the buyer cross-checks the approved drawings against the physical building, meter by meter, before contracts are signed. This article sets out what that check involves and what it keeps finding.

What the Greek Permit File Contains

Building permits have been mandatory in Greece since 1955, and every legally constructed building has a file at the local planning authority. The file contains the approved architectural drawings, the structural study, the site plan showing allowed coverage, and the permit certificate itself. Together they define what was allowed to be built: the footprint, the floors, the total floor area, the openings, the use of each space. Anything standing on the plot that is not in that file either has a later amendment, a regularization record, or a problem.

Obtaining the full file can take time depending on the municipality and the age of the building, which is why the request should go in early. A due diligence window that opens two weeks before signing is not a window, it is a formality.

The Electronic Building Identity Is a Snapshot, Not a Verdict

Since Law 4495/2017, transfers require the Electronic Building Identity, a digital dossier compiled by an engineer that records the building's permits, plans and any regularized violations. It is a genuine improvement, and buyers should absolutely read it. What it is not is an independent verdict. It is compiled from documents and declarations, typically by an engineer engaged by the seller, and it records what has been declared, not what a measuring tape finds on site. A dossier can be internally consistent and still describe a building that does not exist in that form.

BEFORE YOU COMMIT TO A PROPERTY IN GREECE

Send the permit documents, Building Identity extract, floor plans or listing material before signing anything.

We perform remote asset reviews for foreign buyers evaluating properties anywhere in Greece.

This early-stage review identifies: differences between the permitted floor area and the marketed floor area, additions and conversions likely to need regularization, gaps in the permit chain that will stall the notary, and whether a full on-site verification is justified before commitment.

The review is independent, English-language and delivered directly to the buyer.

Submit the property details here: kgnordic.com/contact

The Mismatches That Keep Appearing

The findings are consistent across regions and decades. Semi-outdoor spaces, balconies and verandas closed in to create extra rooms. Basements and storage levels converted to bedrooms and rented as such. Pools, pool houses and outbuildings that appear on no drawing. Extra floor area added during construction, decades ago, by owners who never expected anyone to measure. Under Law 4495/2017 such works must be regularized to be transferred, and Greece has extended the settlement deadline for older violations to 2028 under Law 5261/2025, which means the market is full of properties partway through the process. The fines, the paperwork and the demolition exposure for whatever remains unsettled at transfer belong to the new owner. The full mechanics are covered in our guide to Greece's regularization deadline under Law 5261/2025.

The mismatch also has a price dimension buyers rarely run. A house marketed at 180 square meters but permitted at 140 is being priced on 40 square meters the buyer may have to regularize, pay fines on, or in the worst case remove. At 3,000 euros per square meter, that is 120,000 euros of the purchase price resting on paperwork nobody has verified.

Who Actually Checks the Permit File

Not the notary, whose role is the contract and the taxes. Not the buyer's lawyer, whose search covers title, liens and inheritance, not floor plans. The seller's engineer produces the compliance certificate and the Building Identity, but is engaged and paid by the seller and works largely from documents. The gap is structural, the same one described in our article on buying in Greece without an inspection: every professional in the mandatory chain verifies the transfer, and no one verifies the building. Permit due diligence closes that gap from the buyer's side, and done properly it is inseparable from the condition assessment, because the same site visit that measures the building against its drawings also examines what the building is made of. That combined scope is what our guide to technical due diligence in Greece sets out in full.

What to Ask for Before You Sign Anything

The buyer's checklist is short and decisive. The full permit file from the planning authority, requested early. The Electronic Building Identity extract. Any regularization declarations, with their category and payment status, because a violation declared is not the same as a violation settled. A topographic survey of the plot. And an independent, buyer-side measurement of the building against the approved drawings. If the seller resists any of these, that resistance is itself a finding.

Buying Property in Greece?

Before contracts are signed, we review: the permit file against the physical building, the Electronic Building Identity and any regularization records, coverage and floor-area consistency, and the structural and installation condition behind the paperwork.

For private buyers and investors acquiring property in Greece, we provide independent technical due diligence, property inspections and remote asset reviews, delivered in English directly to the buyer, typically within 7 working days.

Submit the asset location and acquisition details here: kgnordic.com/contact

Frequently Asked Questions

Q - What is building permit due diligence in Greece?

It is the buyer-side verification that the physical building matches its approved permit file: the architectural drawings, structural study, site plan and permit certificate held by the planning authority. It identifies unpermitted additions and conversions before they become the buyer's legal and financial problem at transfer.

Q - Does the Electronic Building Identity prove a property is legal?

Not by itself. The Building Identity under Law 4495/2017 is a digital dossier compiled from documents and declarations, usually by an engineer engaged by the seller. It records what has been declared, not what an independent measurement finds on site, so it should be read alongside the original permit file, not instead of it.

Q - What happens if I buy a property with unpermitted construction in Greece?

The exposure transfers with the property. Unpermitted works must be regularized under Law 4495/2017, with fines based on the size and category of the violation, and Greece's settlement deadline for older violations now runs to 2028 under Law 5261/2025. Whatever is unsettled at transfer becomes the new owner's cost and risk.

Q - Who verifies the permit file when I buy property in Greece?

In the standard transaction, effectively no one on the buyer's side. The notary handles the contract, the lawyer checks title, and the seller's engineer certifies compliance from documents. An independent technical advisor engaged by the buyer is the only party who measures the building against its permits, typically as part of a property inspection or technical due diligence starting from 5,000 euros.