Company lists · Data refreshed September 2026

Top 25 Sustainable design consultants based in South Africa

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 514 companies tracked

RevenueBase identified 514 sustainable design consultants headquartered in South Africa as of September 2026 and tracks 3,626 professional contacts across them, including 1,355 with verified work emails. Johannesburg is the largest hub.

This list covers sustainable design consultants 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 22, 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 22, 2026 86% judged on-target in blind review

514Companies

3,626Contacts tracked

1,355Verified emails

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The 25 largest sustainable design consultants based in South Africa

Ranked by team size

Top 25 of 514 sustainable design consultants based in South Africa, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable design consultants: 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	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	51-200	228 contacts →
	Indirect evidence “Jones & Wagener is a specialist firm of consulting engineers and scientists based in South Africa.” Source: RevenueBase Database · checked Sep 22, 2026
2	Pegasys Consulting	Indirect evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	51-200	170 contacts →
	Indirect 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 22, 2026
3	Digby Wells Environmental	Partial evidence	Bryanston, South AfricaHQ checked Sep 22, 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 22, 2026
4	Ncc-Group PTY LTD	Partial evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	201-500	120 contacts →
	Partial 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 22, 2026
5	Romh Consulting	Indirect evidence	City Of Tshwane, South AfricaHQ checked Sep 22, 2026	51-200	106 contacts →
	Indirect evidence “We are a team of Professional Engineers, Technical specialists and Project Managers organised to provide specialized consulting and management services within the Engineering and…” Source: RevenueBase Database · checked Sep 22, 2026
6	Sutherland	Indirect evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	51-200	102 contacts →
	Indirect evidence “Sutherland is a multi-disciplinary consulting engineering company with offices in Cape Town, Johannesburg, Durban, and Nairobi, Multidisciplinary sub-disciplines include…” Source: RevenueBase Database · checked Sep 22, 2026
7	Siyakha Consulting	Partial evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	51-200	90 contacts →
	Partial evidence “We are a niche firm that drives investment, commercial excellence, developmental strategies, and sustainability.” Source: RevenueBase Database · checked Sep 22, 2026
8	ECO Elementum	Partial evidence	City Of Tshwane, South AfricaHQ checked Sep 22, 2026	51-200	68 contacts →
	Partial evidence “Established in 2013, Eco Elementum is a leading environmental and engineering consultancy.” Source: RevenueBase Database · checked Sep 22, 2026
9	C4 Ecosolutions	Indirect evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	51-200	60 contacts →
	Indirect evidence “Turning Climate Finance into Climate Impact.” Source: RevenueBase Database · checked Sep 22, 2026
10	R&l Architects	Indirect evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	11-50	54 contacts →
	Indirect evidence “R&L Architects (Pty) Ltd was founded by Douglas Roberts in 1964.” Source: RevenueBase Database · checked Sep 22, 2026
11	Terramanzi Group	Indirect evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	11-50	49 contacts →
	Indirect evidence “Terramanzi Group is a leading Cape Town based multi-disciplinary environmental firm.” Source: RevenueBase Database · checked Sep 22, 2026
12	Tcrpv Architects	Partial evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	11-50	39 contacts →
	Partial evidence “TCRPV Architects is a professional South African based design firm.” Source: RevenueBase Database · checked Sep 22, 2026
13	GCX	Partial evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	11-50	38 contacts →
	Partial evidence “The journey to sustainability is complex.” Source: RevenueBase Database · checked Sep 22, 2026
14	Synergy Global Consulting LTD	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 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 22, 2026
15	Hlela Group Of Companies	Indirect evidence	Middelburg, South AfricaHQ checked Sep 22, 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 22, 2026
16	Solid Green	Partial evidence	Johannesburg, South AfricaHQ checked Sep 22, 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 22, 2026
17	Yellow Tree	Indirect evidence	Cape Town, South AfricaHQ checked Sep 22, 2026	11-50	35 contacts →
	Indirect evidence “Climate Change Solutions.” Source: RevenueBase Database · checked Sep 22, 2026
18	Zitholele Consulting	Indirect evidence	Midrand, South AfricaHQ checked Sep 22, 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 22, 2026
19	Tshani Consulting C.C	Indirect evidence	East London, South AfricaHQ checked Sep 22, 2026	11-50	33 contacts →
	Indirect evidence “Tshani Consulting CC is a multi-disciplinary company providing professional advise and services in "Development Planning".” Source: RevenueBase Database · checked Sep 22, 2026
20	Groundtruth	Indirect evidence	Hilton, South AfricaHQ checked Sep 22, 2026	11-50	32 contacts →
	Indirect evidence “An award-winning multidisciplinary consulting company with over 20 years experience in water, biodiversity, and engineering across aquatic and terrestrial ecosystems.” Source: RevenueBase Database · checked Sep 22, 2026
21	Leafyspace	Indirect evidence	Kempton Park, South AfricaHQ checked Sep 22, 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 22, 2026
22	Tv3 Architects I Town Planners I Urban Designers	Indirect evidence	Stellenbosch, South AfricaHQ checked Sep 22, 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 22, 2026
23	Onezero Consulting	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	11-50	26 contacts →
	Indirect evidence “Since our inception in 2010, we coined the term Greenovative and have aimed to be pioneers in the electrical and electronic building.” Source: RevenueBase Database · checked Sep 22, 2026
24	Voltas Technologies South Africa	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	11-50	25 contacts →
	Indirect evidence “A transversal vision, due to the diversity of our product offering, enables VOLTAS Technologies to propose innovative integrated solutions for your projects, leading to…” Source: RevenueBase Database · checked Sep 22, 2026
25	Themba Consultants	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	11-50	24 contacts →
	Indirect evidence “At Themba we provide professional consulting services in infrastructure development.” Source: RevenueBase Database · checked Sep 22, 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 design consultants. 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 design consultants.
Partial evidence: Its own public description names part of sustainable design consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable design consultants. 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 514 sustainable design consultants based in South Africa

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Sustainable design consultants based in South Africa at a glance

As of Sep 22, 2026

37.4%Verified-email coverage

7.1Average contacts per company

1-10Median size (employees)

17.1%Largest-city concentration · Johannesburg

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

364

11-50

127

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 514 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 design consultants, 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 design consultants”. 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 design consultants), 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 design consultants, 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, 1,355 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 22, 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 design consultants 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 design consultants, 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 design consultants are there based in South Africa?

RevenueBase identified 514 sustainable design consultants 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?

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

Which city has the most sustainable design consultants?

Johannesburg leads with 88 headquartered companies, followed by Cape Town (74) and Pretoria (52).

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 1,355 verified decision-maker contacts tracked across these 514 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 22, 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.