Company lists · Data refreshed September 2026

Top 25 Building energy efficiency retrofit companies based in Belgium

Name: Building energy efficiency retrofit 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 75 companies tracked

RevenueBase identified 75 building energy efficiency retrofit companies headquartered in Belgium as of September 2026 and tracks 512 professional contacts across them, including 190 with verified work emails. Mechelen is the largest hub.

This list covers building energy efficiency retrofit 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

75Companies

512Contacts tracked

190Verified emails

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The 25 largest building energy efficiency retrofit companies based in Belgium

Ranked by team size

Top 25 of 75 building energy efficiency retrofit 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 efficiency retrofit 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	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
2	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
3	Delpower	Strong evidence	Thimister-clermont, BelgiumHQ checked Sep 16, 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 16, 2026
4	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
5	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
6	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
7	Isolution	Indirect evidence	Namur, BelgiumHQ checked Sep 16, 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 16, 2026
8	Alfasun	Indirect evidence	Ninove, BelgiumHQ checked Sep 16, 2026	11-50	17 contacts →
	Indirect evidence “nergie zonder zorgen Ga je bouwen?” Source: RevenueBase Database · checked Sep 16, 2026
9	Dnergy	Strong evidence	Brussels, BelgiumHQ checked Sep 16, 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 16, 2026
10	Wattson NV	Partial evidence	Ghent, BelgiumHQ checked Sep 16, 2026	11-50	16 contacts →
	Partial evidence “Wattson maakt van gebouwen de gangmakers van de energietransitie.” Source: RevenueBase Database · checked Sep 16, 2026
11	Ensatec	Indirect evidence	Genk, BelgiumHQ checked Sep 16, 2026	1-10	12 contacts →
	Indirect evidence “Wij helpen jouw bedrijf van A tot Z om maatschappelijk verantwoord te ondernemen en op drie cruciale vlakken winst te boeken.” Source: RevenueBase Database · checked Sep 16, 2026
12	VDB Engineering	Partial evidence	Mechelen, BelgiumHQ checked Sep 16, 2026	11-50	11 contacts →
	Partial evidence “Bewust omgaan met energie is voor zowel bedrijven als particulieren een hot topic.” Source: RevenueBase Database · checked Sep 16, 2026
13	Benotec	Indirect evidence	Mechelen, BelgiumHQ checked Sep 16, 2026	11-50	11 contacts →
	Indirect evidence “Beter renoveren of BENOveren doe je samen met BENOTEC.” Source: RevenueBase Database · checked Sep 16, 2026
14	CLEYS	Partial evidence	Waasmunster, BelgiumHQ checked Sep 16, 2026	11-50	9 contacts →
	Partial evidence “Cleys bv is jouw specialist in energetische renovaties.” Source: RevenueBase Database · checked Sep 16, 2026
15	Dauvister	Partial evidence	Stavelot, BelgiumHQ checked Sep 16, 2026	51-200	9 contacts →
	Partial evidence “Dauvister (170+ employees, 30M€ turnover) studies, installs and maintains energy efficency systems for homeowners as well as for large companies.” Source: RevenueBase Database · checked Sep 16, 2026
16	OXIRA	Indirect evidence	Louvain-la-neuve, BelgiumHQ checked Sep 16, 2026	11-50	9 contacts →
	Indirect evidence “Expert en solutions énergétiques, nous offrons une solution complète et sur mesure pour les projets de rénovation durable de nos clients.” Source: RevenueBase Database · checked Sep 16, 2026
17	Bowers	Partial evidence	Gistel, BelgiumHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “BOWERS® creëert doordachte woon- en werkplekken door goed te isoleren, optimaal te ventileren, energiezuinig te verwarmen en alles ‘smart’ op elkaar af te stemmen.” Source: RevenueBase Database · checked Sep 16, 2026
18	SUN ECO	Partial evidence	Herentals, BelgiumHQ checked Sep 16, 2026	51-200	8 contacts →
	Partial evidence “Sun Eco is de specialist in uw woning energie efficiënter te maken.” Source: RevenueBase Database · checked Sep 16, 2026
19	NEW Tech Projects	Indirect evidence	Tongeren, BelgiumHQ checked Sep 16, 2026	1-10	7 contacts →
	Indirect evidence “New Tech Projects staat voor 'new technology project development'.” Source: RevenueBase Database · checked Sep 16, 2026
20	Optiwatt Scrl	Indirect evidence	Wauthier-braine, BelgiumHQ checked Sep 16, 2026	1-10	7 contacts →
	Indirect evidence “Intéressé par- L'optimisation de vos ressources énergétiques- L'amélioration du confort de vos bâtiments- La valorisation de votre patrimoine immobilier- La maîtrise de vos coûts…” Source: RevenueBase Database · checked Sep 16, 2026
21	Impact US Today	Partial evidence	Kortrijk, BelgiumHQ checked Sep 16, 2026	1-10	5 contacts →
	Partial evidence “We are focused on accelerating the energy transition helping companies, cooperatives, and cities empower their clients, members, and citizen to reduce their energy footprint while…” Source: RevenueBase Database · checked Sep 16, 2026
22	DACO	Partial evidence	Ninove, BelgiumHQ checked Sep 16, 2026	1-10	5 contacts →
	Partial evidence “DACO Total Energy Concepts richt zich specifiek op energiezuinige en duurzame technische installaties.” Source: RevenueBase Database · checked Sep 16, 2026
23	Bauwens Elektromontage	Indirect evidence	Lokeren, BelgiumHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “BAUWENS ELEKTROMONTAGE is a construction company based out of 44 Oosteindeken, Lokeren, Belgium.” Source: RevenueBase Database · checked Sep 16, 2026
24	ONIS	Indirect evidence	Etterbeek, BelgiumHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence “Onis est une entreprise spécialisée dans la rénovation énergétique des bâtiments à Bruxelles.” Source: RevenueBase Database · checked Sep 16, 2026
25	Isoprotect	Indirect evidence	Brussels, BelgiumHQ checked Sep 16, 2026	1-10	3 contacts →
	Indirect evidence 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 efficiency retrofit 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 efficiency retrofit companies.
Partial evidence: Its own public description names part of building energy efficiency retrofit 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 efficiency retrofit 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 75 building energy efficiency retrofit companies based in Belgium

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Building energy efficiency retrofit companies based in Belgium at a glance

As of Sep 16, 2026

37.1%Verified-email coverage

6.8Average contacts per company

1-10Median size (employees)

4.0%Largest-city concentration · Mechelen

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

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 75 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 efficiency retrofit 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 efficiency retrofit 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 efficiency retrofit 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 efficiency retrofit 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, 190 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 efficiency retrofit 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 efficiency retrofit companies are there based in Belgium?

RevenueBase identified 75 building energy efficiency retrofit 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?

Reno Energy, headquartered in Liege, tops this list with the largest team on record.

Which city has the most building energy efficiency retrofit companies?

Mechelen leads with 3 headquartered companies, followed by Brecht (2) and Bruxelles (2).

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 190 verified decision-maker contacts tracked across these 75 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.