Company lists · Data refreshed September 2026

Top 25 City sustainability consultants based in Belgium

Name: City sustainability consultants based in Belgium
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 229 companies tracked

RevenueBase identified 229 city sustainability consultants headquartered in Belgium as of September 2026 and tracks 2,239 professional contacts across them, including 955 with verified work emails. Brussels is the largest hub.

This list covers city sustainability consultants headquartered in Belgium, 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 19, 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 19, 2026 86% judged on-target in blind review

229Companies

2,239Contacts tracked

955Verified emails

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The 25 largest city sustainability consultants based in Belgium

Ranked by team size

Top 25 of 229 city sustainability consultants based in Belgium, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to city sustainability 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	Igretec	Indirect evidence	Charleroi, BelgiumHQ checked Sep 19, 2026	201-500	269 contacts →
	Indirect evidence “Igretec accompagne les pouvoirs publics, les entreprises et les citoyens avec une expertise pluridisciplinaire de 30 métiers, en Wallonie et à Bruxelles.” Source: RevenueBase Database · checked Sep 19, 2026
2	Antea Group Belgium	Indirect evidence	Antwerpen, BelgiumHQ checked Sep 19, 2026	201-500	217 contacts →
	Indirect evidence “Antea Group is an international consulting and engineering firm, specializing in full-service solutions in the fields of environment, infrastructure, public space, and water.” Source: RevenueBase Database · checked Sep 19, 2026
3	ENCON	Indirect evidence	Bilzen, BelgiumHQ checked Sep 19, 2026	51-200	104 contacts →
	Indirect evidence “Encon supports businesses as an independent agency with creative and innovative solutions in their transition to become more sustainable.” Source: RevenueBase Database · checked Sep 19, 2026
4	Idea Consult	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	100 contacts →
	Indirect evidence “IDEA aims to help clients tackle the societal challenges of today and tomorrow by delivering applicable and sustainable advice.” Source: RevenueBase Database · checked Sep 19, 2026
5	Buur Part Of Sweco	Indirect evidence	Leuven, BelgiumHQ checked Sep 19, 2026	51-200	74 contacts →
	Indirect evidence “BUUR Part of Sweco is an interdisciplinary company active in the fields of urbanism, urban planning, landscape design and mobility.” Source: RevenueBase Database · checked Sep 19, 2026
6	Climact	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	64 contacts →
	Indirect evidence “CLIMACT empowers organizations, cities and public authorities to understand climate change and to achieve a zero-carbon sustainable society by 2050.” Source: RevenueBase Database · checked Sep 19, 2026
7	BOPRO	Partial evidence	Ghent, BelgiumHQ checked Sep 19, 2026	51-200	63 contacts →
	Partial evidence “In forty years Bopro has emerged into a solid, renowned company specialised in Sustainable Real Estate Development, Project Management and Consultancy services in Europe.” Source: RevenueBase Database · checked Sep 19, 2026
8	Broptimize Energy	Indirect evidence	Remicourt, BelgiumHQ checked Sep 19, 2026	51-200	51 contacts →
	Indirect evidence “Fondée en 2016 par deux frères, Sébastien et Michael Menu et issue de l'Université de Liège, Broptimize est aujourd'hui la référence en matière d'accompagnement dans la transition…” Source: RevenueBase Database · checked Sep 19, 2026
9	ICEDD	Partial evidence	Namur, BelgiumHQ checked Sep 19, 2026	11-50	49 contacts →
	Partial evidence “Our background The Institut de Conseil et d'Etudes en Développement Durable (Institute for Consultancy and Studies in Sustainable Development) was founded in 1961 as a non-profit…” Source: RevenueBase Database · checked Sep 19, 2026
10	A2o	Indirect evidence	Hasselt, BelgiumHQ checked Sep 19, 2026	11-50	47 contacts →
	Indirect evidence “architecture and urban planning.” Source: RevenueBase Database · checked Sep 19, 2026
11	Sher Ingénieurs-Conseils	Partial evidence	Vedrin, BelgiumHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “SHER Ingénieurs-Conseils, a Belgian engineering consultancy office and member of the Artelia Group, provides its services worldwide for projects related to water, human and animal…” Source: RevenueBase Database · checked Sep 19, 2026
12	Consultes	Indirect evidence	Zwevegem, BelgiumHQ checked Sep 19, 2026	11-50	34 contacts →
	Indirect evidence “Consultes is een allround partner voor bedrijven op vlak van milieu, preventie, energie en duurzaamheid.” Source: RevenueBase Database · checked Sep 19, 2026
13	Groep Infrabo	Strong evidence	Westerlo, BelgiumHQ checked Sep 19, 2026	11-50	33 contacts →
	Strong evidence “With over 40 years of experience in building technologies, sustainability, infrastructure, and water management, Groep Infrabo is an independent engineering and consultancy firm…” Source: RevenueBase Database · checked Sep 19, 2026
14	RDC Environment	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “Our mission is to support decision-making towards a sustainable world." – Bernard De Caevel, Founder of RDC Environment For more than 30 years, RDC Environment has been helping…” Source: RevenueBase Database · checked Sep 19, 2026
15	DR EA M	Indirect evidence	Pont-à-celles, BelgiumHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “DR(EA)²M est un bureau d’études spécialisé dans les matières du développement territorial, de l’aménagement urbain et paysager, de l’environnement, de l’architecture et de…” Source: RevenueBase Database · checked Sep 19, 2026
16	Co2logic, A South Pole Company	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “CO2logic joined the South Pole Group in 2021, forming the world’s largest climate solutions provider and carbon project developer.” Source: RevenueBase Database · checked Sep 19, 2026
17	Sustenuto	Partial evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	24 contacts →
	Partial evidence “Sustenuto is a strategic consulting firm that helps organisations make a difference in society by integrating sustainability at the core of their business.” Source: RevenueBase Database · checked Sep 19, 2026
18	Raco By Studibo	Indirect evidence	Heusden-zolder, BelgiumHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence “Bij Raco by Studibo ondersteunen we bouwprojecten met studies van technische installaties, advies en projectbegeleiding.” Source: RevenueBase Database · checked Sep 19, 2026
19	SLO	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “In a time of ecological challenges and economic uncertainty, businesses play a pivotal role in keeping society stable.” Source: RevenueBase Database · checked Sep 19, 2026
20	Sumproject Sumresearch	Indirect evidence	1000, BelgiumHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “SumProject offers architecture and engineering that breathes and organises space, which is pleasant and efficient, which is innovative and technical.” Source: RevenueBase Database · checked Sep 19, 2026
21	Beel Architecten	Indirect evidence	Ghent, BelgiumHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “In the early 80s Stéphane Beel founded his own architectural office.” Source: RevenueBase Database · checked Sep 19, 2026
22	Axilium Group	Indirect evidence	Schilde, BelgiumHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Axilium is een technisch studiebureau dat waarde hecht aan innovatie, duurzaamheid en kwaliteit.” Source: RevenueBase Database · checked Sep 19, 2026
23	BLEEN	Indirect evidence	Brussels, BelgiumHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “World's gone nuts.” Source: RevenueBase Database · checked Sep 19, 2026
24	Agora Urbanisme	Indirect evidence	Forest, BelgiumHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “La société agora a été créée en 1992 et regroupe une trentaine de collaborateurs.” Source: RevenueBase Database · checked Sep 19, 2026
25	Peritas	Indirect evidence	Antwerp, BelgiumHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “Bij Peritas bieden we onze klanten niet alleen betrouwbare, energie-efficiënte oplossingen voor hun engineeringprojecten, maar zetten we ook in op innovatie en efficiëntie.” Source: RevenueBase Database · checked Sep 19, 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: city sustainability 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 city sustainability consultants.
Partial evidence: Its own public description names part of city sustainability consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name city sustainability 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 229 city sustainability consultants based in Belgium

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City sustainability consultants based in Belgium at a glance

As of Sep 19, 2026

42.7%Verified-email coverage

9.8Average contacts per company

1-10Median size (employees)

7.9%Largest-city concentration · Brussels

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

166

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for Belgium, so it is reported there. Company counts and contact totals on this page are exact for Belgium, over 229 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 city sustainability 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 Belgium whose own description of what they do matches “city sustainability 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 city sustainability 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 city sustainability consultants, and records with no verified work email. Companies headquartered outside Belgium 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, 955 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 19, 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.

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 city sustainability 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 city sustainability consultants are there based in Belgium?

RevenueBase identified 229 city sustainability consultants headquartered in Belgium 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?

Igretec, headquartered in Charleroi, tops this list with the largest team on record.

Which city has the most city sustainability consultants?

Brussels leads with 18 headquartered companies, followed by Liege (11) and Gent (9).

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 955 verified decision-maker contacts tracked across these 229 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 19, 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.