Buying and Renovating in Greece: Islands vs Mainland

Buying and renovating in Greece runs through two people before it runs through a lawyer: an AFM tax number, which you must obtain before you can transact anything, and a TEE-registered engineer (μηχανικός), who is legally central to almost every property step from due diligence to permits to signing off the works. Greece does not separate architect, surveyor and building inspector the way northern Europe does — the engineer carries much of that combined role, and no serious purchase or renovation happens without one.

The second thing to understand is that Greece is really two markets. On the mainland, a renovation behaves like a normal construction project. On the islands, the same job is governed by shipping schedules, seasonal labour and clearances that can add months before a spade goes in. Underestimating that gap is the classic foreign-buyer mistake, and it is entirely avoidable if you plan for it up front.

The two things you need first: AFM and an engineer

The AFM (Αριθμός Φορολογικού Μητρώου) is your Greek tax registration number. You need it to open a bank account, sign the purchase contract, and pay the transfer tax, so obtaining it — through the tax office or a representative acting under power of attorney — is step one, not an afterthought.

The engineer is the figure foreign buyers most often under-budget for and most need. A TEE-registered engineer — registered with the Technical Chamber of Greece — inspects the property, confirms the built structure matches the permits and the title, prepares the topographic and structural documentation, and later obtains the building permits for your works. In a country where older properties frequently have discrepancies between what is on paper and what is on the ground, this inspection is the single most valuable check you can commission.

What the purchase itself costs

Beyond the price, budget for the transfer tax on resale properties (new-builds can attract VAT instead), notary fees for the deed, land-registry costs, and your lawyer's and engineer's fees. Treat total acquisition costs as a meaningful slice on top of the headline price, and get each figure quoted before you commit rather than at signing.

Clearances that delay island projects

Greek land carries overlays that must be cleared before you can build, and on the islands they bite hardest:

• Forestry clearance — confirmation that the land is not classified as forest or reforestation land, which can restrict or block building even on plots that look plainly buildable.
• Archaeology clearance — approval from the archaeological service, which can require inspection or supervision in areas of historical sensitivity and delay works while it is arranged.
• Coastal and protected-zone limits — setback and protection rules near shorelines that constrain what and where you can build.
• Legalisation status — whether existing structures or extensions were ever properly permitted, which the engineer must establish before you rely on them.

None of these are exotic; they are routine parts of Greek due diligence. But an archaeology or forestry question that a mainland engineer resolves in a few weeks can stretch far longer on a small island where the relevant office is understaffed and reachable only by ferry. Build the clearance timeline into your purchase, not your renovation.

The island renovation reality

Renovating on a Greek island is a logistics exercise as much as a building one. Materials that are a warehouse trip away on the mainland arrive by ferry, on a schedule, at a cost, and sometimes not at all in rough weather. Skilled crews are scarce and heavily booked in the tourist season, and many work summers only, so a job started in autumn can pause over winter when the trades and the ferries both thin out. The practical consequences are concrete:

• Order materials early and in full — a single missing item can idle a crew for a week waiting on the next boat.
• Expect a premium on both labour and delivered materials versus equivalent mainland work.
• Plan works around the season: builders are hardest to secure in high summer and slowest in deep winter.
• Keep a contingency in the budget specifically for shipping delays and weather, not just for scope changes.

The mainland removes most of this friction. Around Athens, Thessaloniki and the larger towns you have road access, a deeper pool of year-round trades, and merchants who deliver on demand — a renovation there runs on a timeline a northern European buyer would recognise. The island premium buys you the location; it does not buy you the logistics.

Legalising older and semi-legal structures

A large share of Greek properties, especially older village and island houses, carry some element that was built or extended without full permits. Greece has run legalisation schemes that let owners regularise these structures by declaring them and paying a fee, and doing so is often a precondition of a clean sale. This is squarely the engineer's territory: they measure what actually exists, compare it to the permits and title, and quantify what must be legalised before you buy. Never accept a seller's assurance that everything is in order — pay your engineer to prove it, because you inherit the problem the day you sign.

Because so much of Greek buying rests on the engineer's independence, choosing one who works for you rather than for the seller matters as much as it does with any other trade. Veted checks the licence, insurance and review history behind the professionals it lists, which is exactly the verification a foreign buyer cannot easily do across a language barrier and a ferry timetable.

Greece rewards patience and punishes assumption. Get your AFM early, hire a TEE-registered engineer who answers to you, clear the forestry and archaeology questions before you commit, and — if you are buying on an island — plan the renovation around ferries and seasons rather than pretending they do not exist. The buyers who struggle here are the ones who treated an island like the mainland; the ones who thrive simply respected the difference.