Company lists · Data refreshed September 2026

Top 25 Building energy optimization companies based in Belgium

Name: Building energy optimization companies based in Belgium
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 228 companies tracked

RevenueBase identified 228 building energy optimization companies headquartered in Belgium as of September 2026 and tracks 7,343 professional contacts across them, including 2,524 with verified work emails. Bruxelles is the largest hub.

This list covers building energy optimization companies 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 16, 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 16, 2026 86% judged on-target in blind review

228Companies

7,343Contacts tracked

2,524Verified emails

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The 25 largest building energy optimization companies based in Belgium

Ranked by team size

Top 25 of 228 building energy optimization companies based in Belgium, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to building energy optimization companies: 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	Equans Belux	Indirect evidence	Brussels, BelgiumHQ checked Sep 16, 2026	5,001-10,000	5,297 contacts →
	Indirect evidence “What if you could use your talent to contribute to the great challenges of tomorrow?” Source: RevenueBase Database · checked Sep 16, 2026
2	Smappee	Partial evidence	Harelbeke, BelgiumHQ checked Sep 16, 2026	51-200	120 contacts →
	Partial evidence “Smappee is an energy technology company.” Source: RevenueBase Database · checked Sep 16, 2026
3	Vlaams Energiebedrijf	Partial evidence	Brussels, BelgiumHQ checked Sep 16, 2026	51-200	116 contacts →
	Partial evidence “Welkom bij het Vlaams EnergieBedrijf.” Source: RevenueBase Database · checked Sep 16, 2026
4	INDEA	Partial evidence	Aalst, BelgiumHQ checked Sep 16, 2026	n/a	115 contacts →
	Partial evidence “Wij helpen industriële bedrijven hun energiekosten te verminderen.” Source: RevenueBase Database · checked Sep 16, 2026
5	Reno Energy	Partial evidence	Liège (angleur), BelgiumHQ checked Sep 16, 2026	51-200	106 contacts →
	Partial evidence “Reno Energy est une entreprise spécialisée dans le secteur de la rénovation énergétique mais aussi dans la nouvelle construction.” Source: RevenueBase Database · checked Sep 16, 2026
6	Energyking	Partial evidence	Herent, BelgiumHQ checked Sep 16, 2026	51-200	53 contacts →
	Partial evidence “EnergyKing werd in 2013 opgericht door twee ingenieurs: Lucas & Wiet.” Source: RevenueBase Database · checked Sep 16, 2026
7	The Energy Circle	Partial evidence	Hasselt, BelgiumHQ checked Sep 16, 2026	201-500	40 contacts →
	Partial evidence “Van onderhoud & monitoring, elektrische installaties & groene stroom, tot waterbeheer & HVAC-systemen: The Energy Circle heeft alle expertise in huis om grote gebouwen en…” Source: RevenueBase Database · checked Sep 16, 2026
8	Bureau D'études A Concept	Indirect evidence	Liège, BelgiumHQ checked Sep 16, 2026	11-50	38 contacts →
	Indirect evidence “A+ Concept est un bureau d'études composé d'experts énergétiques et ingénieurs spécialisés dans les techniques du bâtiment.” Source: RevenueBase Database · checked Sep 16, 2026
9	MK Engineering	Partial evidence	Bruxelles, BelgiumHQ checked Sep 16, 2026	11-50	35 contacts →
	Partial evidence “Bureau d'Etudes en Design Energétique du Bâtiment, MK Engineering s'est forgé une solide expérience en conception très basse énergie avec ses services de Conseil aux Architecte et…” Source: RevenueBase Database · checked Sep 16, 2026
10	Enerdeal By EDP	Partial evidence	Zaventem, BelgiumHQ checked Sep 16, 2026	11-50	33 contacts →
	Partial evidence “Enerdeal by EDP supports industrial and public players in their energy transition, turning solar energy into a strategic lever for performance, sustainability and independence.” Source: RevenueBase Database · checked Sep 16, 2026
11	QUITO	Indirect evidence	Noville-les-bois, BelgiumHQ checked Sep 16, 2026	1-10	27 contacts →
	Indirect evidence “Quito existe pour offrir une solution coordonnée aux propriétaires cherchant à améliorer la performance énergétique de leur bien le plus simplement et esthétiquement possible afin…” Source: RevenueBase Database · checked Sep 16, 2026
12	Delpower	Partial evidence	Thimister-clermont, BelgiumHQ checked Sep 16, 2026	11-50	24 contacts →
	Partial evidence “DELPOWER is an energy efficiency engineering company dedicated to optimising energy costs for tertiary and industrial customers.” Source: RevenueBase Database · checked Sep 16, 2026
13	ESE	Partial evidence	Veurne, BelgiumHQ checked Sep 16, 2026	51-200	24 contacts →
	Partial evidence “Op maat van elke individuele klant werkt ESE de technisch optimale en meest economische oplossing uit voor hun specifieke energie problemen en dit steeds vanuit een ecologisch…” Source: RevenueBase Database · checked Sep 16, 2026
14	Group VHC	Partial evidence	Overijse, BelgiumHQ checked Sep 16, 2026	51-200	24 contacts →
	Partial evidence “Group VHC zorgt al meer dan 25 jaar voor slimme oplossingen in verwarming, koeling, ventilatie en zonne energie.” Source: RevenueBase Database · checked Sep 16, 2026
15	We Green Belgium	Indirect evidence	Zaventem, BelgiumHQ checked Sep 16, 2026	11-50	24 contacts →
	Indirect evidence “We Green vise à réduire la dépendance de ses clients aux sources d'énergie non-durables afin de diminuer leurs émissions de carbone via des solutions énergétiques vertes et…” Source: RevenueBase Database · checked Sep 16, 2026
16	NOVEN	Partial evidence	Gent, BelgiumHQ checked Sep 16, 2026	11-50	24 contacts →
	Partial evidence “Climate change is an urgent reality, and buildings, which are responsible for nearly 40% of the EU's GHG emissions, play a pivotal role.” Source: RevenueBase Database · checked Sep 16, 2026
17	Ecopuur	Indirect evidence	9850, BelgiumHQ checked Sep 16, 2026	11-50	23 contacts →
	Indirect evidence “Ecopuur bekijkt het verbruikspatroon van je huidige of nieuwe woning.” Source: RevenueBase Database · checked Sep 16, 2026
18	Soltis	Indirect evidence	Evere, BelgiumHQ checked Sep 16, 2026	11-50	23 contacts →
	Indirect evidence “Soltis est une entreprise créée en 2008 qui accompagne professionnels et particuliers dans la mise en place de solutions vertes et rentables avec un seul but: améliorer…” Source: RevenueBase Database · checked Sep 16, 2026
19	Helexia Belgium	Partial evidence	Antwerpen, BelgiumHQ checked Sep 16, 2026	201-500	23 contacts →
	Partial evidence “Helexia is your all-in-one partner for accelerating your energy transition.” Source: RevenueBase Database · checked Sep 16, 2026
20	cozie.be	Partial evidence	België, BelgiumHQ checked Sep 16, 2026	51-200	23 contacts →
	Partial evidence “Cozie \| Durable Comfort Cozie is a vibrant company that works with ENGIE to combine the energy and dynamism of a start-up with the technical competence & long-term vision of an…” Source: RevenueBase Database · checked Sep 16, 2026
21	Fixsus	Indirect evidence	Evergem, BelgiumHQ checked Sep 16, 2026	11-50	21 contacts →
	Indirect evidence “At Fixsus, we make technology work together.” Source: RevenueBase Database · checked Sep 16, 2026
22	Energis	Partial evidence	Louvain-la-neuve, BelgiumHQ checked Sep 16, 2026	11-50	21 contacts →
	Partial evidence “Energis is a European greentech software scale-up headquartered in Belgium.” Source: RevenueBase Database · checked Sep 16, 2026
23	ODOT	Partial evidence	Schoten, BelgiumHQ checked Sep 16, 2026	11-50	21 contacts →
	Partial evidence “Odot optimises energy management for businesses and specialises in Energy Contract Management, consumption monitoring and customised consultancy services.” Source: RevenueBase Database · checked Sep 16, 2026
24	Trinergy	Partial evidence	Woluwe-saint-lambert, BelgiumHQ checked Sep 16, 2026	11-50	20 contacts →
	Partial evidence “Energy Management Software.” Source: RevenueBase Database · checked Sep 16, 2026
25	Priva Building Automation Belgium	Strong evidence	2550 Kontich, BelgiumHQ checked Sep 16, 2026	201-500	20 contacts →
	Strong evidence “Priva Building Automation helps owners, developers and investors to build environments that make people feel better while using energy in the most sustainable manner possible.” Source: RevenueBase Database · checked Sep 16, 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: building energy optimization companies. 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 building energy optimization companies.
Partial evidence: Its own public description names part of building energy optimization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building energy optimization companies. 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 228 building energy optimization companies based in Belgium

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Building energy optimization companies based in Belgium at a glance

As of Sep 16, 2026

34.4%Verified-email coverage

32.2Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · Bruxelles

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

150

11-50

51-200

201-500

5,001-10,000

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 228 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 building energy optimization companies, 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 “building energy optimization companies”. 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 building energy optimization companies), 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 building energy optimization companies, 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, 2,524 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 16, 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 building energy optimization companies, 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 building energy optimization companies are there based in Belgium?

RevenueBase identified 228 building energy optimization companies 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?

Equans Belux, headquartered in Belgium, tops this list with the largest team on record.

Which city has the most building energy optimization companies?

Bruxelles leads with 8 headquartered companies, followed by Antwerpen (7) and Gent (6).

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 2,524 verified decision-maker contacts tracked across these 228 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 16, 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.