Company lists · Data refreshed September 2026

Top 25 Geotechnical consulting firms based in Türkiye

Name: Geotechnical consulting firms based in Türkiye
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 488 companies tracked

RevenueBase identified 488 geotechnical consulting firms headquartered in Türkiye as of September 2026 and tracks 4,458 professional contacts across them, including 301 with verified work emails. Istanbul is the largest hub.

This list covers geotechnical consulting firms headquartered in Türkiye, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 14, 2026 86% judged on-target in blind review

488Companies

4,458Contacts tracked

301Verified emails

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The 25 largest geotechnical consulting firms based in Türkiye

Ranked by team size

Top 25 of 488 geotechnical consulting firms based in Türkiye, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to geotechnical consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Koltek Consulting CO	Partial evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	501-1,000	253 contacts →
	Partial evidence “Established in 1988, KOLTEK is a technical consulting firm that offers multidisciplinary engineering services locally and abroad.” Source: RevenueBase Database · checked Sep 14, 2026
2	Temelsu International Engineering Services INC	Partial evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	201-500	188 contacts →
	Partial evidence “TEMELSU is a well known Turkish consulting engineering company which provides multidisciplinary engineering services, locally and internationally, since its foundation in 1969.” Source: RevenueBase Database · checked Sep 14, 2026
3	Kasktaş	Indirect evidence	Beşiktaş, TürkiyeHQ checked Sep 14, 2026	201-500	167 contacts →
	Indirect evidence “KASKTAŞ’ın doğuşu, 1957 yılında kurulan ve günümüzde dünyanın en büyük taahhüt firmaları arasında yer alan ENKA İnşaat ve Sanayi A.Ş.’ye dayanmaktadır.” Source: RevenueBase Database · checked Sep 14, 2026
4	Mega Engineering Consulting	Partial evidence	Umitkoy, TürkiyeHQ checked Sep 14, 2026	201-500	119 contacts →
	Partial evidence “MEGA Engineering Consulting Inc, established in 1993, is a multidisciplinary firm that provides engineering, design, construction supervision and project management services for a…” Source: RevenueBase Database · checked Sep 14, 2026
5	İksa Mühendislik	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	501-1,000	118 contacts →
	Indirect evidence “IKSA Engineering Consultancy Construction Industry and Trade Inc; with its expert technical staff, numerous technological machinery and successfully concluded domestic and foreign…” Source: RevenueBase Database · checked Sep 14, 2026
6	Promer Consultancy Engineering INC	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	51-200	102 contacts →
	Indirect evidence “PROMER Müşavirlik Mühendislik A.Ş.® is an independent engineering-consultancy company offering various professional solutions and services for industries such as mining, power…” Source: RevenueBase Database · checked Sep 14, 2026
7	Zemin Etüd VE Tasarım A.Ş	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 14, 2026	51-200	52 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
8	EFK Engineering	Indirect evidence	Çankaya, TürkiyeHQ checked Sep 14, 2026	51-200	44 contacts →
	Indirect evidence “EFK Engineering is an engineering and design company established in 2004 in Ankara, Turkey.” Source: RevenueBase Database · checked Sep 14, 2026
9	Perform Mühendi̇sli̇k	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 14, 2026	51-200	36 contacts →
	Indirect evidence “HİZMET ALANLARIMIZ YÜKSEK YAPILAR ENDÜSTRİ VE ENERJİ TESİSLERİ TOPLU KONUTLAR HASTANELER TURİSTİK TESİSLER ve AVM'ler DEPREM GÜVENLİK ANALİZLERİ KENTSEL DÖNÜŞÜM PROJELERİ DİĞER…” Source: RevenueBase Database · checked Sep 14, 2026
10	Geodestek Ltd. ŞTI	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	11-50	32 contacts →
	Indirect evidence “GeoDestek Zemar Ltd.” Source: RevenueBase Database · checked Sep 14, 2026
11	AGM Mühendislik	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	11-50	31 contacts →
	Indirect evidence “AGM Mühendislik 1993 yılında Ankara'da kurulmuştur.” Source: RevenueBase Database · checked Sep 14, 2026
12	Ozifin Mining LTD	Partial evidence	Çankaya, TürkiyeHQ checked Sep 14, 2026	11-50	30 contacts →
	Partial evidence “Ozifin is an independent, international engineering and consulting company based in Turkey, providing comprehensive solutions to the mining industry and related sectors since 2016.” Source: RevenueBase Database · checked Sep 14, 2026
13	Sonar Drilling, Geological Survey And Geotechnical Services Co. INC	Partial evidence	Kazan, TürkiyeHQ checked Sep 14, 2026	201-500	28 contacts →
	Partial evidence “SONAR provides Geotechnical Construction and Engineering Services; such as Deep Excavation and Retaining Systems, Deep Foundations, Ground Improvement, Cut-Off Walls, and Ground…” Source: RevenueBase Database · checked Sep 14, 2026
14	Advens Engineering	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 14, 2026	11-50	27 contacts →
	Indirect evidence “Advens Mühendislik A.Ş, Türkiye’nin önemli teknoloji üslerinden biri olan Teknopark İstanbul’da, tesis güvenlik sertifikalı ofisinde tüm çalışmalarını büyük bir gizlilik ve…” Source: RevenueBase Database · checked Sep 14, 2026
15	Ulus Mühendi̇sli̇k	Indirect evidence	Maltepe, TürkiyeHQ checked Sep 14, 2026	11-50	26 contacts →
	Indirect evidence “Ulus Mühendislik Olarak, ÇEVRE DANIŞMANLIĞI' nda Uzman Mühendis Kadrolarımızla Hizmet Sunmaktayız.” Source: RevenueBase Database · checked Sep 14, 2026
16	TEM Engineering & Consulting	Partial evidence	Istanbul, TürkiyeHQ checked Sep 14, 2026	11-50	24 contacts →
	Partial evidence “TEM is a consulting engineering company providing civil, structural engineering, architectural design, infrastructural engineering, mechanical engineering, electrical engineering…” Source: RevenueBase Database · checked Sep 14, 2026
17	Erdemli Proje VE Müşavirlik	Partial evidence	Akaretler, TürkiyeHQ checked Sep 14, 2026	11-50	24 contacts →
	Partial evidence “Erdemli Engineering and Consulting has a vivid experience of 50 years in the field of civil-structural design and is one of the pioneering Consulting – Engineering companies of…” Source: RevenueBase Database · checked Sep 14, 2026
18	Promota Mühendi̇sli̇k VE Müşavi̇rli̇k AŞ	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	11-50	21 contacts →
	Indirect evidence “PROMOTA her biri kendi alanında 20 yıl üzerinde mühendislik tasarımları, müşavirlik ve inşaat yönetimi alanlarında gösterdiği performans ve geliştirdiği projeler ile uzmanlaşmış…” Source: RevenueBase Database · checked Sep 14, 2026
19	Teknofor İnşaat Taah. Ltd. Şti̇	Partial evidence	Dilovası, TürkiyeHQ checked Sep 14, 2026	51-200	19 contacts →
	Partial evidence “Teknofor was established in and specializes about geotechnical and started to post tensioning work since 2009.” Source: RevenueBase Database · checked Sep 14, 2026
20	Büro Statik Mühendislik İnşaat San. VE Tic. Ltd. ŞTI	Indirect evidence	Beşiktaş, TürkiyeHQ checked Sep 14, 2026	11-50	18 contacts →
	Indirect evidence “Büro Statik Mühendislik İnşaat San.” Source: RevenueBase Database · checked Sep 14, 2026
21	Modern Mühendislik	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 14, 2026	11-50	17 contacts →
	Indirect evidence “Modern Muhendislik was established in 2005 by Galip Topönder, who has 25 years of experience in Civil & Structural Engineering.” Source: RevenueBase Database · checked Sep 14, 2026
22	Orient Research Consulting Engineers	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 14, 2026	11-50	16 contacts →
	Indirect evidence “Orient Research Group aims to provide solutions across a wide spectrum of engineering needs.” Source: RevenueBase Database · checked Sep 14, 2026
23	Endeco Engineering Design Consultancy	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	11-50	16 contacts →
	Indirect evidence “ENDECO is an engineering, design and consultancy company which was established in 2003.” Source: RevenueBase Database · checked Sep 14, 2026
24	Ural Engineering	Indirect evidence	Ankara, TürkiyeHQ checked Sep 14, 2026	51-200	15 contacts →
	Indirect evidence “URAL Engineering Co.” Source: RevenueBase Database · checked Sep 14, 2026
25	OTS Proje Müşavirlik İnşaat	Indirect evidence	Kadıkoy - Istanbul, TürkiyeHQ checked Sep 14, 2026	11-50	14 contacts →
	Indirect evidence “The company was first established in 1965 under the name of “Vehbi Ozden Project & Design”, mostly working in the area of reinforced concrete structural design, construction of…” Source: RevenueBase Database · checked Sep 14, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: geotechnical consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names geotechnical consulting firms.
Partial evidence: Its own public description names part of geotechnical consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geotechnical consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 488 geotechnical consulting firms based in Türkiye

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Geotechnical consulting firms based in Türkiye at a glance

As of Sep 14, 2026

6.8%Verified-email coverage

9.1Average contacts per company

1-10Median size (employees)

19.5%Largest-city concentration · Istanbul

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

293

11-50

127

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for Türkiye, so it is reported there. Company counts and contact totals on this page are exact for Türkiye, over 488 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among geotechnical consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Türkiye whose own description of what they do matches “geotechnical consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names geotechnical consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among geotechnical consulting firms, and records with no verified work email. Companies headquartered outside Türkiye are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 301 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 14, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Geotechnical consulting firms by metro

Geotechnical consulting firms in Istanbul95
Geotechnical consulting firms in Ankara83
Geotechnical consulting firms in Cankaya35

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names geotechnical consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many geotechnical consulting firms are there based in Türkiye?

RevenueBase identified 488 geotechnical consulting firms headquartered in Türkiye as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Koltek Consulting CO, headquartered in Ankara, tops this list with the largest team on record.

Which city has the most geotechnical consulting firms?

Istanbul leads with 95 headquartered companies, followed by Ankara (83) and Cankaya (35).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 301 verified decision-maker contacts tracked across these 488 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 14, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.