Company lists · Data refreshed September 2026

Top 25 Residential energy efficiency companies based in Belgium

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 216 companies tracked

RevenueBase identified 216 residential energy efficiency companies headquartered in Belgium as of September 2026 and tracks 1,539 professional contacts across them, including 639 with verified work emails. Antwerpen is the largest hub.

This list covers residential energy efficiency 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 17, 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 17, 2026 86% judged on-target in blind review

216Companies

1,539Contacts tracked

639Verified emails

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The 25 largest residential energy efficiency companies based in Belgium

Ranked by team size

Top 25 of 216 residential energy efficiency companies based in Belgium, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to residential energy efficiency 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	Smappee	Partial evidence	Harelbeke, BelgiumHQ checked Sep 17, 2026	51-200	120 contacts →
	Partial evidence “Smappee is an energy technology company.” Source: RevenueBase Database · checked Sep 17, 2026
2	Reno Energy	Partial evidence	Liège (angleur), BelgiumHQ checked Sep 17, 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 17, 2026
3	Opteco	Indirect evidence	Zonhoven, BelgiumHQ checked Sep 17, 2026	11-50	58 contacts →
	Indirect evidence “Met een ervaring van meer dan installaties heeft het management van Opteco de nodige kennis in huis om uw project te realiseren.” Source: RevenueBase Database · checked Sep 17, 2026
4	Energyking	Partial evidence	Herent, BelgiumHQ checked Sep 17, 2026	51-200	53 contacts →
	Partial evidence “EnergyKing werd in 2013 opgericht door twee ingenieurs: Lucas & Wiet.” Source: RevenueBase Database · checked Sep 17, 2026
5	MR Solar	Strong evidence	Zwevegem, BelgiumHQ checked Sep 17, 2026	51-200	51 contacts →
	Strong evidence “Efficiency Thanks to our advice focused on a sustainable ecosystem, we offer our customers a tailor-made energy solution, resulting in optimal efficiency in both the near and…” Source: RevenueBase Database · checked Sep 17, 2026
6	Insaver	Indirect evidence	Houthalen, BelgiumHQ checked Sep 17, 2026	51-200	45 contacts →
	Indirect evidence “At Insaver, we guide you every step of the way toward a low-carbon future.” Source: RevenueBase Database · checked Sep 17, 2026
7	QUITO	Indirect evidence	Noville-les-bois, BelgiumHQ checked Sep 17, 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 17, 2026
8	Delpower	Strong evidence	Thimister-clermont, BelgiumHQ checked Sep 17, 2026	11-50	24 contacts →
	Strong evidence “DELPOWER is an energy efficiency engineering company dedicated to optimising energy costs for tertiary and industrial customers.” Source: RevenueBase Database · checked Sep 17, 2026
9	ESE	Partial evidence	Veurne, BelgiumHQ checked Sep 17, 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 17, 2026
10	We Green Belgium	Indirect evidence	Zaventem, BelgiumHQ checked Sep 17, 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 17, 2026
11	Ecopuur	Indirect evidence	9850, BelgiumHQ checked Sep 17, 2026	11-50	23 contacts →
	Indirect evidence “Ecopuur bekijkt het verbruikspatroon van je huidige of nieuwe woning.” Source: RevenueBase Database · checked Sep 17, 2026
12	Soltis	Indirect evidence	Evere, BelgiumHQ checked Sep 17, 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 17, 2026
13	cozie.be	Partial evidence	België, BelgiumHQ checked Sep 17, 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 17, 2026
14	ENSYS	Strong evidence	Kapellen, BelgiumHQ checked Sep 17, 2026	11-50	22 contacts →
	Strong evidence “As specialists in the field of renewable energy and energy efficiency, we offer unique proposals to both individuals and businesses.” Source: RevenueBase Database · checked Sep 17, 2026
15	Belivert	Partial evidence	Zedelgem, BelgiumHQ checked Sep 17, 2026	51-200	21 contacts →
	Partial evidence “Vraag gratis je offerte aan, Bespaar dankzij de zonnepanelen van BeliVert heel wat energiekosten.” Source: RevenueBase Database · checked Sep 17, 2026
16	Polarsun	Indirect evidence	Barchon, BelgiumHQ checked Sep 17, 2026	11-50	20 contacts →
	Indirect evidence “Chez Polarsun, nous concevons, installons et assurons le suivi de solutions énergétiques durables pour les particuliers, les entreprises et les collectivités.” Source: RevenueBase Database · checked Sep 17, 2026
17	Energieconcepten	Partial evidence	Arendonk, BelgiumHQ checked Sep 17, 2026	11-50	19 contacts →
	Partial evidence “Energieconcepten biedt duurzame energieoplossingen voor het verwarmen, ventileren, verlichten, sturen… van gebouwen.” Source: RevenueBase Database · checked Sep 17, 2026
18	EMAZE	Partial evidence	Gent, BelgiumHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “Emaze provides actionable energy advice for the industrial, service and public sector: Energy management - Implement an energy management system (e.g.” Source: RevenueBase Database · checked Sep 17, 2026
19	Energreen België	Partial evidence	Brussels, BelgiumHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “Energreen biedt duurzame totaaloplossingen voor iedere woning.” Source: RevenueBase Database · checked Sep 17, 2026
20	Watt Matters	Indirect evidence	Ixelles, BelgiumHQ checked Sep 17, 2026	11-50	18 contacts →
	Indirect evidence “Plus grand producteur bruxellois d’énergie partagée, Watt Matters est une entreprise spécialisée dans la conception, l’installation, le financement et l’exploitation…” Source: RevenueBase Database · checked Sep 17, 2026
21	Techem Belgium - Caloribel	Partial evidence	Sint-jans-molenbeek, BelgiumHQ checked Sep 17, 2026	51-200	18 contacts →
	Partial evidence “Europees leider in energiebeheer Techem, opgericht in 1962, is een Duitse groep die wereldwijd bekend is bij mede-eigenaren en sociale verhuurders op het gebied van energiebeheer.” Source: RevenueBase Database · checked Sep 17, 2026
22	Isolution	Indirect evidence	Namur, BelgiumHQ checked Sep 17, 2026	11-50	17 contacts →
	Indirect evidence “ISOLUTION est une société spécialisée dans l'isolation et la ventilation de bâtiment pour particuliers et professionnels, et ce depuis plus de 12 ans Aujourd'hui, Isolution compte…” Source: RevenueBase Database · checked Sep 17, 2026
23	Alfasun	Indirect evidence	Ninove, BelgiumHQ checked Sep 17, 2026	11-50	17 contacts →
	Indirect evidence “nergie zonder zorgen Ga je bouwen?” Source: RevenueBase Database · checked Sep 17, 2026
24	Dnergy	Strong evidence	Brussels, BelgiumHQ checked Sep 17, 2026	11-50	16 contacts →
	Strong evidence “At dnergy ®, we are committed to enabling asset and facility managers to enhance their building portfolios' energy efficiency and proactive compliance through our innovative dEEP…” Source: RevenueBase Database · checked Sep 17, 2026
25	Wattson NV	Partial evidence	Ghent, BelgiumHQ checked Sep 17, 2026	11-50	16 contacts →
	Partial evidence “Wattson maakt van gebouwen de gangmakers van de energietransitie.” Source: RevenueBase Database · checked Sep 17, 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: residential energy efficiency 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 residential energy efficiency companies.
Partial evidence: Its own public description names part of residential energy efficiency companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name residential energy efficiency 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 216 residential energy efficiency companies based in Belgium

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Residential energy efficiency companies based in Belgium at a glance

As of Sep 17, 2026

41.5%Verified-email coverage

7.1Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · Antwerpen

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

139

11-50

51-200

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 216 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 residential energy efficiency 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 “residential energy efficiency 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 residential energy efficiency 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 residential energy efficiency 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, 639 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 17, 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 residential energy efficiency 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 residential energy efficiency companies are there based in Belgium?

RevenueBase identified 216 residential energy efficiency 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?

Smappee, headquartered in Harelbeke, tops this list with the largest team on record.

Which city has the most residential energy efficiency companies?

Antwerpen leads with 6 headquartered companies, followed by Gent (5) and Arendonk (3).

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 639 verified decision-maker contacts tracked across these 216 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 17, 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.