Türkiye's building code overhaul following the 1999 Marmara earthquake, and its further tightening after the 2023 Kahramanmaraş disaster, has turned seismic compliance into one of the sharpest due diligence questions for foreign buyers. For Russian investors evaluating residential or commercial property in Istanbul, Antalya, or the Aegean coast, understanding how seismic regulation actually shapes asset value, insurance cost, and renovation risk is now as important as location or price per square meter.
Why the 2018 Code Changed the Market
The current national standard, TBDY 2018 (Turkish Building Earthquake Code), replaced earlier regulations with stricter requirements for soil-structure interaction, reinforced concrete detailing, and mandatory structural engineering sign-off. Buildings permitted after 2019 must meet these standards, and municipalities have become considerably more rigorous about enforcing them through the yapı denetim (construction supervision) system, which assigns independent inspection firms to monitor a project from foundation to occupancy permit.
For a Russian buyer, this creates a practical dividing line: properties built or permitted before 2018 carry meaningfully different risk profiles than those built after. This is not a cosmetic distinction. It affects financing terms some Turkish banks apply, insurance premiums, and resale liquidity, since sophisticated local and foreign buyers increasingly ask for a building's permit date and inspection history before making an offer.
Soil Survey : A zemin etüdü, or geotechnical soil survey, is required before permitting in seismic zones, and its findings determine foundation design and allowable building height. Investors should request this document directly rather than relying on a developer's summary, since soil conditions vary sharply even within the same district, particularly along reclaimed coastal land and river deltas common in parts of Istanbul and the Marmara region.
Kentsel Dönüşüm and Older Building Stock
A large share of Türkiye's urban housing stock predates the 2018 code, and much of it predates the 1999 reforms entirely. The government's kentsel dönüşüm (urban transformation) program incentivizes demolition and reconstruction of at-risk buildings, often with density bonuses for developers who rebuild to current standards. Russian investors considering older apartment blocks in central Istanbul neighborhoods, where much of the appreciation potential lies, should treat kentsel dönüşüm status as a core diligence item: a building already flagged for transformation may face near-term demolition, redevelopment assessments, or temporary occupancy restrictions, all of which change the investment thesis materially.
Insurance and Ongoing Cost
DASK, the state-mandated earthquake insurance scheme, is compulsory for residential property and priced partly on construction type, age, and location relative to fault lines. Commercial and larger residential developments typically carry additional private earthquake coverage on top of DASK. Russian investors should factor these recurring costs into yield calculations from the outset rather than treating them as an afterthought at closing, since premiums on older or non-compliant buildings can be substantially higher than on post-2018 construction.
Practical Due Diligence Steps
Before committing capital, investors should verify the building's ruhsat (construction permit) date and confirm it falls under TBDY 2018 or later. They should request the yapı denetim inspection reports, which are a matter of public record through the relevant municipality, and independently confirm the soil survey and structural engineer's certification rather than accepting a developer's assurances at face value. For resale or income-producing assets, a third-party structural assessment is a modest cost relative to the protection it provides, particularly for buildings constructed in the transitional years around 2018 when enforcement was still being standardized.
What This Means for Portfolio Strategy
Seismic compliance should not be treated as a binary pass-fail filter that eliminates entire districts. Some of the most desirable central locations, including parts of Kadıköy and older sections of the European side, contain a mix of compliant new builds and pre-code stock. The more useful approach is building-by-building verification paired with a clear view of each asset's insurance cost, renovation exposure, and kentsel dönüşüm status. Investors who build this discipline into their acquisition process, rather than relying solely on developer marketing materials, are better positioned to hold assets that retain both structural integrity and resale liquidity as Turkish regulatory enforcement continues to tighten.
Working with advisors who can independently verify permit dates, inspection records, and soil survey findings, rather than depending on seller-provided documentation, remains the most reliable safeguard for Russian capital entering Türkiye's real estate market.