Developer Due Diligence in Turkey: 7 Documents and a 36-Month Deadline

An unfinished tower block in Istanbul or Antalya is almost never a true surprise. The warning signs are usually visible well in advance: the land is registered to one company, the contract is signed by another, and the payment goes to a third account entirely. Turkish market experts are blunt about it: a buyer's real guarantee on an off-plan unit is the developer's financial stability, not a glossy render or a discount offer.

Checking a developer in Turkey takes 3 to 10 working days and costs between 500 and 1,500 dollars with a lawyer involved. That is roughly 1% of the deal budget against the risk of losing the entire investment.

Below are the exact registries, document names and legal deadlines you should verify before the first payment leaves your account.

Quick Answer

• Law 6502 (Consumer Protection Law, articles 40-46) requires pre-sale housing contracts (ön ödemeli konut satışı) to be notarized or registered with the land registry. Verbal agreements and a sales-office 'reservation form' carry no legal weight.

• The legal delivery deadline is a maximum of 36 months from the contract date. A longer term written into the contract is void.

• You have 14 days to withdraw from the contract without any reason and without penalty. If you cancel later, the developer may keep no more than 2% of the contract price.

• The developer must provide security before accepting the first payment: either construction completion insurance (bina tamamlama sigortası) or a bank guarantee.

• Key verification sources: Türkiye Ticaret Sicili Gazetesi (trade registry), MERSIS (company registration number), TKGM (land registry and Tapu Kaydı extract), and the Yapı Denetim independent construction supervision system under Law 4708¹.

• The minimum document pack includes: Tapu Kaydı, yapı ruhsatı (building permit), kat irtifakı (floor easement / construction-stage title), imar durumu (zoning status), a licensed SPK valuation report (mandatory for foreign buyers, valid for 3 months), a trade registry extract, and the developer's record of delivered projects.

Scenarios and Options

Scenario 1: Buying from a large national developer in Istanbul. A company with 10+ completed projects in Başakşehir or Kartal publishes financial statements, works with bank project financing, and almost always issues kat irtifakı tapu immediately. Prices run 10-20% above market, but delivery risk is minimal. Trade-off: you pay a premium for predictability and give up early-stage upside.

Scenario 2: Buying from a local developer in Antalya or Alanya. Dozens of companies with 1-3 projects operate in Altıntaş and Konyaaltı. Entry prices are 15-25% lower, and early-stage discounts are real. But due diligence needs to be stricter here: financing often comes directly from buyers' own payments, so a slowdown in sales of one block can stall the whole site. Insist on bina tamamlama sigortası and a payment schedule tied to construction milestones, not calendar dates.

Scenario 3: Buying a resale (cessation) in an unfinished project from a private seller. An assignment (devir) can look cheap, but you inherit someone else's contract, defects included. Check whether the contract is registered with the land registry and whether any payment arrears exist: debt transfers along with the right.

Scenario 4: A kat karşılığı project, where a landowner exchanges the plot for a share of future units. Common in Istanbul's urban renewal zones. The critical question is whose unit is actually being sold, the developer's share or the landowner's share. A mismatch between the roles of landowner, builder, seller and payment recipient is the first red flag in any check¹.

Comparison Table

Main Risks and Mistakes

Paying before the notarized contract. Money handed over for a 'reservation' stamped only by a sales office sits outside Law 6502's protection. Mitigation: no lira changes hands before notarization or land registry filing.

No kat irtifakı issued. If the plot carries no registered floor-share right, your future unit legally does not exist yet. Mitigation: demand kat irtifakı tapu tied to a specific unit and block number, and cross-check it against the sales plan¹.

Mismatch between built and registered structure. Unregistered extensions, extra floors, or altered layouts can block the iskan (yapı kullanma izin belgesi, occupancy permit). Without iskan, reselling the unit or connecting permanent utilities becomes difficult. Mitigation: compare the physical building against the documents before signing².

Bank mortgage on the land. A common situation: the plot is pledged against project financing. This is not fatal by itself, but you need a written bank letter releasing the encumbrance on your specific unit after payment. Mitigation: get it in writing, never verbally.

Judging a project by its renders and price. Evaluating a development purely on marketing images and discounts is the single biggest buyer mistake. Review the project's permits, planning file, and the company's track record instead⁴.

A brand-new 'single-purpose' company behind the project. Developers frequently set up a separate SPV for each site, meaning the parent company's reputation does not automatically transfer. Mitigation: check the shareholder structure of the new entity and its links to prior projects through the trade registry.

Ignoring currency and valuation rules. Foreign buyers must pay through a Turkish bank with a currency conversion certificate (Döviz Alım Belgesi) and submit a licensed SPK valuation report. Without these, the land registry will not record the transfer of title.

Worth noting for context: Turkey's construction production index fell 4.7% year-on-year in July 2026, though it rose 1.1% month-on-month on a seasonally adjusted basis³. That index tracks physical construction volume only, not transaction prices, permits issued, or completed housing stock, so it is not a reliable signal of where any single project or region is headed.

FAQ

How do I check a developer in Turkey on my own?

Start with the full legal name and tax number. Cross-check them in Türkiye Ticaret Sicili Gazetesi and MERSIS, then request a current Tapu Kaydı extract from TKGM for the project's plot. The roles of landowner, builder, seller and payment recipient should all match the contract¹.

What is kat irtifakı and why does it matter?

It is a construction-stage shared ownership right, registered against a specific unit with its own number and land share (arsa payı). Without it, you hold no title, only the developer's promise.

Can I get my money back if construction stalls?

If bina tamamlama sigortası or a bank guarantee is in place, yes, the mechanism is built into Law 6502. Without that security, your only recourse is court, and the creditor queue in a bankruptcy is long.

What is the legal maximum construction timeline in Turkey?

Under a pre-sale housing contract, delivery must occur no later than 36 months from the contract date. Longer terms written into the contract can be challenged.

Does due diligence differ between Istanbul and Antalya?

The legal procedures are nationwide, but practice differs by region. Istanbul sees more kat karşılığı structures and urban renewal projects with complex, layered ownership rights. Antalya and Alanya have more small developers running 1-3 projects, which shifts the emphasis of due diligence toward the company's financial stability².

What should a developer show me about past projects?

Project names, addresses, unit counts, start dates, and promised versus actual delivery dates. Logos and photos prove nothing; talking directly to owners and managers of completed complexes is worth far more¹.

Do I still need a lawyer if an agent already checked everything?

Yes. An independent Turkish lawyer pulls documents straight from the registries and answers to you, not to the seller. Legal support typically costs 1-1.5% of the transaction value.

What happens if a resold unit has no iskan?

A buyer seeking a mortgage won't get financing, and utility connections remain temporary. Units without iskan trade at a discount on the resale market.

The practical takeaway: do not transfer a single lira until you hold three documents in hand, a fresh Tapu Kaydı extract from TKGM, the yapı ruhsatı for the project, and a notarized contract backed by confirmed security. Everything else is secondary.

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Sources (4)

This material was prepared with the help of artificial intelligence and checked by a person. Editorial responsibility: Housebook Investment LLC.