The costliest error is taking legal advice from the other side. The agent is paid on completion, which is a different interest than acting for you. An independent lawyer represents a small fraction of the purchase and remains the best protection.
Putting your name to untranslated contracts ranks close behind. A certified translation is inexpensive compared with the purchase price. Assurances given by the agent mean nothing if the written contract says otherwise — the contract is what counts.
Buying off-plan without checking the developer has damaged a great many buyers. Before any payment, property management peyia examine previous developments, the building permits, buy property in mtskheta-mtianeti and the guarantees on staged payments. Projects running behind schedule happen frequently with even the best developers; abandoned sites are rarer but genuinely ruinous.
Thinking only about the purchase is less obvious but just as costly. A home bought abroad has to be sold or passed on at some point, and the resale market matters. A unit that only appeals to foreign buyers takes longer to sell property in menton a weak market.
Finally, plenty of purchasers fail to plan for the running costs. Annual declarations can be required even when the home sits empty, and missed deadlines lead to penalties that accumulate quietly. Setting up a local accountant at the outset heads off most of it.