What Is a Soil Survey and Why Is It Required Before Building in Turkey?
The soil survey is one of the earliest — and most frequently skipped — steps in the building permit process. We explain what it is, why it's a legal requirement, and what determines its cost.
The soil survey is one of the earliest — and technically most decisive — steps in the building permit process, ranking 2nd in our 10-step checklist. It's not a formality that can be rushed through; it's an engineering report that directly shapes the project's foundational design.
What is a soil survey?
A soil survey is a technical report, prepared by a licensed geology/geophysics engineering firm through drilling and laboratory analysis on your plot, that determines the soil's bearing capacity, layer structure, groundwater level, and seismic behavior (soil class). This report forms the direct basis for which foundation type (raft, isolated footing, piled, etc.) the structural engineer will choose and how the load-bearing system will be calculated.
Why is it a legal requirement?
Because most of Turkey carries some degree of earthquake risk, a building's structural project cannot be prepared, and its building permit application cannot be accepted, without a soil survey report. This is a legal requirement that has been progressively tightened since the 1999 earthquakes — a structural system calculated without knowing the soil's actual behavior carries unpredictable risk.
What determines the cost?
- Plot size and number of floors: a larger or taller building generally requires more borehole points.
- Site accessibility: on sloped, rocky, or hard-to-reach plots, getting the drilling equipment to the site can raise the cost.
- Drilling depth: the depth needed to reach the soil's load-bearing layer varies with local geology and directly affects cost.
- Scope of laboratory analysis: the number of different lab tests the samples go through also factors into the budget.
Because of these variables, quoting a flat "average price" would be misleading — every plot needs a site-specific quote from a geology engineering firm.
The process at MEEZ Mimarlık
We don't carry out soil surveys ourselves — that's a separate area of expertise and licensing — but early in the process we connect you directly with geology engineering firms we trust, and we follow the report through to make sure it progresses in step with the structural project.
Frequently Asked Questions
Can you get a building permit without a soil survey?
No. Without a soil survey report, a structural project cannot be prepared and the building permit application will not be accepted; this is a legal requirement that was tightened after the 1999 earthquakes.
What determines the cost of a soil survey?
Plot size and number of floors, site accessibility (equipment access on sloped/rocky plots), the required drilling depth, and the scope of laboratory analysis — these variables make it misleading to quote a flat average price.
Does MEEZ Mimarlık carry out the soil survey itself?
No, that's a separate area of expertise and licensing; we connect you with geology engineering firms we trust and follow the process to make sure the report stays aligned with the structural project.
