Company lists · Data refreshed September 2026

Top 25 Geotechnical consulting firms based in Johannesburg, South Africa

Name: Geotechnical consulting firms based in Johannesburg, South Africa
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 70 companies tracked

RevenueBase identified 70 geotechnical consulting firms headquartered in Johannesburg, South Africa as of September 2026 and tracks 839 professional contacts across them, including 342 with verified work emails and 27 with mobile numbers. Across South Africa, Johannesburg is the largest hub for this category.

This list covers geotechnical consulting firms headquartered in Johannesburg, South Africa, 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 12, 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 12, 2026 86% judged on-target in blind review

70Companies

839Contacts tracked

342Verified emails

27Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest geotechnical consulting firms based in Johannesburg, South Africa

Ranked by team size

Top 25 of 70 geotechnical consulting firms based in Johannesburg, South Africa, ranked by team size, largest first. Data refreshed Sep 12, 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	Jones & Wagener PTY LTD	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	51-200	228 contacts →
	Partial evidence “Jones & Wagener is a specialist firm of consulting engineers and scientists based in South Africa.” Source: RevenueBase Database · checked Sep 12, 2026
2	Henry Fagan Consulting Engineers & Project Managers	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	201-500	99 contacts →
	Partial evidence “At Henry Fagan Consulting Engineers & Project Managers, we are a 100% black-owned, design-focused firm with over 40 years of experience delivering innovative, sustainable, and…” Source: RevenueBase Database · checked Sep 12, 2026
3	Venn Milford Incorporated	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	51-200	30 contacts →
	Partial evidence “Since 1947, we have built a reputation as cutting-edge visionaries who deliver quality multi-disciplinary projects and consulting services to clients in the mining, engineering…” Source: RevenueBase Database · checked Sep 12, 2026
4	L&s Consulting PTY LTD	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	51-200	26 contacts →
	Partial evidence “L&S Consulting (Pty) Ltd is involved in Structural and Civil Consulting Engineering, mainly for the private sector for industrial, retail and office developments.” Source: RevenueBase Database · checked Sep 12, 2026
5	Resultant Consulting Engineers	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	22 contacts →
	Partial evidence “Resultant Consulting Engineers is a dynamic engineering firm specialising in structural design in the mining and heavy industrial sectors.” Source: RevenueBase Database · checked Sep 12, 2026
6	Rafuni PTY LTD	Strong evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	22 contacts →
	Strong evidence “Rafuni offers Geotechnical, Geological and Environmental Consulting Services.” Source: RevenueBase Database · checked Sep 12, 2026
7	Rasnco Consulting Engineers	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	201-500	20 contacts →
	Indirect evidence “We at Rasnco Investments, are a vibrant and innovative company wholly owned by black Professionals, which was established at the beginning of 2017.” Source: RevenueBase Database · checked Sep 12, 2026
8	ADA Consulting Engineers	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	18 contacts →
	Partial evidence “ADA Consulting Engineers offers professional consulting engineering services to clients in the development of industrial, commercial and public projects in the civil and…” Source: RevenueBase Database · checked Sep 12, 2026
9	Blackhead Consulting	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	13 contacts →
	Partial evidence “Blackhead Consulting (Pty) Ltd, established in 2004, is a black owned and managed consulting company that provides professional services in the engineering and project management…” Source: RevenueBase Database · checked Sep 12, 2026
10	Civilab PTY LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	51-200	13 contacts →
	Indirect evidence “Civilab is one of the most technically advanced civil and mining engineering laboratories in South Africa.” Source: RevenueBase Database · checked Sep 12, 2026
11	Sydwalt PTY LTD	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	10 contacts →
	Partial evidence “SYDWALT (Pty) Ltd is an independent engineering Consulting firm, offering a broad range of professional services.” Source: RevenueBase Database · checked Sep 12, 2026
12	Aqua Earth	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	8 contacts →
	Indirect evidence “Aqua Earth celebrates more than 20 years of operation and prides itself on having a dynamic team of specialists in Hydrogeology, also identified as Groundwater, as well as…” Source: RevenueBase Database · checked Sep 12, 2026
13	Carlisle & Associates	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	8 contacts →
	Indirect evidence “Carlisle & Associates is a civil and structural engineering consultancy based in Johannesburg, South Africa.” Source: RevenueBase Database · checked Sep 12, 2026
14	B&s Geological	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	8 contacts →
	Indirect evidence “At B&S Geological we are passionate about applying our geological expertise and mastery of cutting-edge modelling software to make a tangible difference.” Source: RevenueBase Database · checked Sep 12, 2026
15	Watson Consulting Engineers PTY LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	7 contacts →
	Indirect evidence “Engineering Excellence Our cutting-edge projects are carried out by a team of talented engineers who want to transform our communities.” Source: RevenueBase Database · checked Sep 12, 2026
16	Rosnovanu & Associates	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	6 contacts →
	Partial evidence “Consulting Civil & Structural Engineers specialising in: Factories and Warehouses Apartment building developments Reinforced concrete Houses & residential projects Roads &…” Source: RevenueBase Database · checked Sep 12, 2026
17	Absolute Mining Consultants PTY LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	5 contacts →
	Indirect evidence “Abmincon is a specialized Mining Engineering Consultancy dedicated to providing customized and innovative solutions for our clients.” Source: RevenueBase Database · checked Sep 12, 2026
18	Delusch Consulting Engineers	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	5 contacts →
	Indirect evidence “Formerly Barry Devenish & Associates established in 1991, we have over 80 years combined engineering and construction experience including specialised skills in structural steel…” Source: RevenueBase Database · checked Sep 12, 2026
19	Prysm Resources PTY LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	3 contacts →
	Indirect evidence “Prysm Resource is a privately owned and operated consultancy, engineering and manufacturing company, providing independent, strategic and tactical advice and personalized…” Source: RevenueBase Database · checked Sep 12, 2026
20	Lines, Smolka And Associates	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	3 contacts →
	Indirect evidence “Lines, Smolka and Associates has been providing a range of professional structural engineering and project management services for more than 25 years.” Source: RevenueBase Database · checked Sep 12, 2026
21	TVNA	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	3 contacts →
	Partial evidence “Consulting Civil and Structural Engineering, Concrete repair, Facade Repair, Carbon Fibre Strengthening, Steel Structures, Building Audits, Inspections.” Source: RevenueBase Database · checked Sep 12, 2026
22	Knutton Consulting	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	11-50	2 contacts →
	Partial evidence “Knutton Consulting is a Consulting Civil and Structural firm - rebranded in 2018 to.KCE Consulting” Source: RevenueBase Database · checked Sep 12, 2026
23	Entail Geotechnical Consulting	Strong evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	2 contacts →
	Strong evidence “Welcome to Entail Geotechnical Consulting, a pioneering force in tailings engineering, dedicated to revolutionizing tailings storage and management solutions and ensuring…” Source: RevenueBase Database · checked Sep 12, 2026
24	RED Bush Analytics	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	1 contacts →
	Indirect evidence “Red Bush Analytics was established in April 2016 to service small to medium-sized, advanced-stage evaluation projects and existing mining operations of all sizes.” Source: RevenueBase Database · checked Sep 12, 2026
25	Tshele GEO Services And Sourcing	Partial evidence	Johannesburg, South AfricaHQ checked Sep 12, 2026	1-10	1 contacts →
	Partial evidence “Tshele Geo Services and Sourcing (Tshele) is a professional geosciences consulting group based in Johannesburg.” Source: RevenueBase Database · checked Sep 12, 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 70 geotechnical consulting firms based in Johannesburg, South Africa

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 342 reachable decision-makers.

Free signup · no credit card

View the full list →

Geotechnical consulting firms based in Johannesburg, South Africa at a glance

As of Sep 12, 2026

40.8%Verified-email coverage

3.2%Mobile-number coverage

12.0Average contacts per company

1-10Median size (employees)

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

2900–30

5131–60

061–90

090–180

1180+

Company record updated

Median 63.0d

00–30

30831–60

38561–90

9390–180

53180+

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 Johannesburg, South Africa 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 Johannesburg 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, 342 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 12, 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 in South Africa

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 Johannesburg, South Africa?

RevenueBase identified 70 geotechnical consulting firms headquartered in Johannesburg, South Africa 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?

Jones & Wagener PTY LTD, headquartered in Johannesburg, tops this list with the largest team on record.

Which city in South Africa has the most geotechnical consulting firms?

Johannesburg leads South Africa with 70 headquartered companies, followed by Cape Town (41) and Pretoria (31).

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 342 verified decision-maker contacts tracked across these 70 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 12, 2026.

Ready to reach these companies? Verified emails and direct dials for all 70 geotechnical consulting firms based in Johannesburg, South Africa. Start with a free account, no credit card.

Download this list →

Related lists

Geotechnical consulting firms by geography

Browse the directory

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.