Qatar has one of the most rigorous building codes in the Gulf, but it was built around wind loading, extreme heat, and coastal soil conditions, not seismic loading. Türkiye's building code sits on the opposite end of the spectrum: it exists almost entirely because of earthquake risk. For a Qatari investor moving capital into Turkish real estate for the first time, this is not a minor technical footnote. It changes how a building is designed, how it is inspected, how it is insured, and how its resale value behaves over a twenty or thirty year holding period.
Why Türkiye's seismic code is a different category of regulation
The current framework, TBDY 2018 (Turkish Building Earthquake Code), replaced earlier codes after the country's major fault lines, most notably the North Anatolian Fault, made clear that older-generation buildings could not be trusted at scale. The code sets requirements for soil investigation, structural system selection, ductility detailing, and site-specific seismic hazard mapping. Istanbul, in particular, sits in a zone where seismologists have flagged a meaningful probability of a significant earthquake affecting the Marmara region within coming decades. This is public, well-documented risk, and it is priced into how developers, lenders, and insurers treat different districts and different building vintages.
For a Qatari buyer used to Doha's regulatory environment, the practical difference is this: in Türkiye, the age and structural documentation of a building matters as much as its finish quality or location. A newly constructed tower built under TBDY 2018 and a twenty-five-year-old building in the same neighborhood can carry very different risk profiles even if they look comparable from the street.
What this means for due diligence
Soil report (zemin etüdü) : Every legitimate development in Türkiye should have a site-specific geotechnical survey on file. This document determines the foundation system and directly affects the structural design. Investors should request it as a matter of course, not treat it as optional paperwork.
Yapı denetim (independent building inspection) : Türkiye requires third-party inspection firms, separate from the contractor, to sign off on structural stages of construction. Confirming that a project used a properly licensed denetim firm, and reviewing their inspection reports, is a basic step that many first-time foreign buyers skip.
Building age and retrofit status : For existing stock rather than new-build, ask directly whether the building has undergone any seismic assessment or reinforcement. Türkiye has an active urban transformation program (kentsel dönüşüm) that has demolished and rebuilt large volumes of older housing stock precisely because of this risk, and buildings that fall outside that program in older districts warrant closer structural scrutiny.
DASK earthquake insurance : Turkish law requires mandatory earthquake insurance (DASK) on residential property, with supplemental commercial coverage available separately. This is a baseline, not a substitute for structural due diligence, but its pricing can itself be a signal of perceived risk in a given building.
Practical implications for portfolio decisions
None of this should be read as a reason to avoid Türkiye. Regulatory maturity around seismic risk is, if anything, a sign of a market that has learned from past failures and tightened its standards accordingly. Post-2018 construction in well-regulated municipalities is held to a materially higher structural standard than what existed two decades ago. The practical takeaway for a Qatari investor is simply to build seismic due diligence into acquisition criteria the same way one would evaluate title, zoning, or rental yield: request the soil report, verify the denetim history, check the construction date against the code timeline, and factor structural age into any long-hold valuation model.
Working with advisors who can read these documents in Turkish and verify them against municipal and code records is the difference between a routine checklist item and a genuine blind spot in a cross-border transaction.