Company lists · Data refreshed September 2026

Top 25 Sustainable development consultancies based in South Africa

Name: Sustainable development consultancies based in South Africa
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 487 companies tracked

RevenueBase identified 487 sustainable development consultancies headquartered in South Africa as of September 2026 and tracks 2,858 professional contacts across them, including 994 with verified work emails. Johannesburg is the largest hub.

This list covers sustainable development consultancies headquartered in 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 29, 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 29, 2026 86% judged on-target in blind review

487Companies

2,858Contacts tracked

994Verified emails

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The 25 largest sustainable development consultancies based in South Africa

Ranked by team size

Top 25 of 487 sustainable development consultancies based in South Africa, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable development consultancies: 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	Pegasys Consulting	Partial evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	51-200	170 contacts →
	Partial evidence “Pegasys is a multidisciplinary strategic management consulting group with expertise in the development and management of climate change, cities, energy, resilience, transport…” Source: RevenueBase Database · checked Sep 29, 2026
2	Digby Wells Environmental	Partial evidence	Bryanston, South AfricaHQ checked Sep 29, 2026	51-200	169 contacts →
	Partial evidence “Digby Wells Environmental delivers integrated environmental, social and sustainability solutions across the resource, infrastructure, energy and agriculture sectors.” Source: RevenueBase Database · checked Sep 29, 2026
3	Ncc-Group PTY LTD	Indirect evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	201-500	120 contacts →
	Indirect evidence “Established in South Africa in 2003, NCC-Group delivers specialist consulting and implementation services designed to meet the unique needs of each project – both locally and…” Source: RevenueBase Database · checked Sep 29, 2026
4	Siyakha Consulting	Strong evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	51-200	90 contacts →
	Strong evidence “We are a niche firm that drives investment, commercial excellence, developmental strategies, and sustainability.” Source: RevenueBase Database · checked Sep 29, 2026
5	Pele Energy Group	Strong evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	51-200	68 contacts →
	Strong evidence “A sustainable development company.” Source: RevenueBase Database · checked Sep 29, 2026
6	C4 Ecosolutions	Indirect evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	51-200	60 contacts →
	Indirect evidence “Turning Climate Finance into Climate Impact.” Source: RevenueBase Database · checked Sep 29, 2026
7	Terramanzi Group	Indirect evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	11-50	49 contacts →
	Indirect evidence “Terramanzi Group is a leading Cape Town based multi-disciplinary environmental firm.” Source: RevenueBase Database · checked Sep 29, 2026
8	GCX	Partial evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	11-50	38 contacts →
	Partial evidence “The journey to sustainability is complex.” Source: RevenueBase Database · checked Sep 29, 2026
9	Synergy Global Consulting LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	11-50	37 contacts →
	Indirect evidence “Synergy Global Consulting Ltd (Synergy) is an independent international consulting company that works with natural resource and infrastructure sectors operating in challenging…” Source: RevenueBase Database · checked Sep 29, 2026
10	Hlela Group Of Companies	Indirect evidence	Middelburg, South AfricaHQ checked Sep 29, 2026	51-200	37 contacts →
	Indirect evidence “Hlela Group is a diversified engineering, project and execution management service provider based in Mpumalanga, South Africa.” Source: RevenueBase Database · checked Sep 29, 2026
11	Solid Green	Partial evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	11-50	36 contacts →
	Partial evidence “Solid Green Consulting is a young and energetic company enthusiastic about advancing sustainability in the built environment.” Source: RevenueBase Database · checked Sep 29, 2026
12	Harmattan Renewables	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	11-50	35 contacts →
	Indirect evidence “Harmattan Renewables brings together a team of experienced renewables consultants who have been at the forefront of developing Africa’s renewables sector.” Source: RevenueBase Database · checked Sep 29, 2026
13	Yellow Tree	Indirect evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	11-50	35 contacts →
	Indirect evidence “Climate Change Solutions.” Source: RevenueBase Database · checked Sep 29, 2026
14	Zitholele Consulting	Indirect evidence	Midrand, South AfricaHQ checked Sep 29, 2026	11-50	33 contacts →
	Indirect evidence “ZITHOLELE CONSULTING, offers Specialist Consulting Services in the fields of Engineering, Environmental Management, Waste Management and Strategic Communication.” Source: RevenueBase Database · checked Sep 29, 2026
15	Tshani Consulting C.C	Partial evidence	East London, South AfricaHQ checked Sep 29, 2026	11-50	33 contacts →
	Partial evidence “Tshani Consulting CC is a multi-disciplinary company providing professional advise and services in "Development Planning".” Source: RevenueBase Database · checked Sep 29, 2026
16	Leafyspace	Indirect evidence	Kempton Park, South AfricaHQ checked Sep 29, 2026	11-50	31 contacts →
	Indirect evidence “LeafySpace (Pty) Ltd was established in 2010, and have branches located in Gauteng, Cape Town, Durban, Limpopo, and Eastern Cape.” Source: RevenueBase Database · checked Sep 29, 2026
17	Solink	Indirect evidence	Cape Town, South AfricaHQ checked Sep 29, 2026	51-200	27 contacts →
	Indirect evidence “SOLINK is a leading technical advisor and project facilitator in the renewable energy sector.” Source: RevenueBase Database · checked Sep 29, 2026
18	Tv3 Architects I Town Planners I Urban Designers	Indirect evidence	Stellenbosch, South AfricaHQ checked Sep 29, 2026	11-50	27 contacts →
	Indirect evidence “Our mission is to sustain a successful, professional practice through the application of PROFESSIONAL EXPERTISE SERVICE EXCELLENCE PROFESSIONAL ETHICS SOUND BUSINESS PRACTICE For…” Source: RevenueBase Database · checked Sep 29, 2026
19	Blue North Sustainability	Partial evidence	Stellenbosch, South AfricaHQ checked Sep 29, 2026	11-50	22 contacts →
	Partial evidence “The pressure on businesses to supply products and behave in ways that achieve “sustainability” is growing.” Source: RevenueBase Database · checked Sep 29, 2026
20	Environmental Assurance PTY LTD	Indirect evidence	Pretoria, South AfricaHQ checked Sep 29, 2026	11-50	21 contacts →
	Indirect evidence “ENVASS Group of Companies is an environmental consultancy, established in 2004 in South Africa.” Source: RevenueBase Database · checked Sep 29, 2026
21	Savannah Environmental PTY LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	11-50	21 contacts →
	Indirect evidence “Through undertaking a broad range of environmental studies, Savannah Environmental has gained extensive experience with regards to environmental legislation requirements and…” Source: RevenueBase Database · checked Sep 29, 2026
22	Promethium Carbon	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	11-50	19 contacts →
	Indirect evidence “Promethium Carbon is a specialist advisory firm focusing on carbon and climate change.” Source: RevenueBase Database · checked Sep 29, 2026
23	Brundtland Consulting	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 29, 2026	1-10	19 contacts →
	Indirect evidence “Brundtland Consulting is a South African management consulting firm specialized in climate change, green economy and renewable energy.” Source: RevenueBase Database · checked Sep 29, 2026
24	Kongiwe	Indirect evidence	Bryanston, South AfricaHQ checked Sep 29, 2026	11-50	19 contacts →
	Indirect evidence “Founded in 2016, Kongiwe is a contemporary consultancy with the purpose ‘To solve environmental and social challenges by providing expert bespoke solutions that promote current…” Source: RevenueBase Database · checked Sep 29, 2026
25	Vuna Agribusiness	Indirect evidence	Hillcrest, South AfricaHQ checked Sep 29, 2026	1-10	18 contacts →
	Indirect evidence “Headquartered in Hillcrest, KwaZulu-Natal, Vuna Agribusiness is a specialist consultancy bridging the gap between technical agricultural design and financial bankability.” Source: RevenueBase Database · checked Sep 29, 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: sustainable development consultancies. 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 sustainable development consultancies.
Partial evidence: Its own public description names part of sustainable development consultancies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable development consultancies. 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 487 sustainable development consultancies based in South Africa

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Sustainable development consultancies based in South Africa at a glance

As of Sep 29, 2026

34.8%Verified-email coverage

5.9Average contacts per company

1-10Median size (employees)

18.3%Largest-city concentration · Johannesburg

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

371

11-50

103

51-200

201-500

Email recency for this list is measured worldwide rather than for South Africa, so it is reported there. Company counts and contact totals on this page are exact for South Africa, over 487 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 sustainable development consultancies, 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 South Africa whose own description of what they do matches “sustainable development consultancies”. 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 sustainable development consultancies), 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 sustainable development consultancies, and records with no verified work email. Companies headquartered outside South Africa 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, 994 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 29, 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.

Sustainable development consultancies by metro

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 sustainable development consultancies, 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 sustainable development consultancies are there based in South Africa?

RevenueBase identified 487 sustainable development consultancies headquartered in 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?

Pegasys Consulting, headquartered in Cape Town, tops this list with the largest team on record.

Which city has the most sustainable development consultancies?

Johannesburg leads with 89 headquartered companies, followed by Cape Town (87) and Pretoria (37).

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 994 verified decision-maker contacts tracked across these 487 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 29, 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.