Company lists · Data refreshed September 2026

Top 25 Retrofit contractors based in Belgium

Name: Retrofit contractors based in Belgium
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 205 companies tracked

RevenueBase identified 205 retrofit contractors headquartered in Belgium as of September 2026 and tracks 1,447 professional contacts across them, including 611 with verified work emails. Bruxelles is the largest hub.

This list covers retrofit contractors 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

205Companies

1,447Contacts tracked

611Verified emails

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The 25 largest retrofit contractors based in Belgium

Ranked by team size

Top 25 of 205 retrofit contractors 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 retrofit contractors: 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	Renotec NV	Indirect evidence	Geel, BelgiumHQ checked Sep 17, 2026	501-1,000	342 contacts →
	Indirect evidence “Renotec is een gespecialiseerde hoofdaannemer die zich focust op energetische renovatie- en restauratiewerken en geeft zo gebouwen, monumenten, kunstwerken en ondergrondse…” Source: RevenueBase Database · checked Sep 17, 2026
2	Reno Energy	Indirect evidence	Liège (angleur), BelgiumHQ checked Sep 17, 2026	51-200	106 contacts →
	Indirect 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	SIX Izegem	Indirect evidence	Izegem, BelgiumHQ checked Sep 17, 2026	201-500	35 contacts →
	Indirect evidence “SIX staat voor kwaliteit en standvastigheid, zoveel is zeker.” Source: RevenueBase Database · checked Sep 17, 2026
4	Goessens	Indirect evidence	Hannut, BelgiumHQ checked Sep 17, 2026	51-200	31 contacts →
	Indirect evidence “Goessens est une société spécialisée dans l'installation de systèmes de chauffage, de ventilation et de climatisation.” Source: RevenueBase Database · checked Sep 17, 2026
5	AIR Ambiance SA	Indirect evidence	Battice, BelgiumHQ checked Sep 17, 2026	11-50	28 contacts →
	Indirect evidence “ÉCOLOGIE - ÉCONOMIE - QUALITÉ Air Ambiance a pour mission: de répondre aux besoins de chauffage, de climatisation, de réfrigération et de ventilation en proposant un service…” Source: RevenueBase Database · checked Sep 17, 2026
6	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
7	Group VHC	Indirect evidence	Overijse, BelgiumHQ checked Sep 17, 2026	51-200	24 contacts →
	Indirect evidence “Group VHC zorgt al meer dan 25 jaar voor slimme oplossingen in verwarming, koeling, ventilatie en zonne energie.” Source: RevenueBase Database · checked Sep 17, 2026
8	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
9	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
10	Energieconcepten	Indirect evidence	Arendonk, BelgiumHQ checked Sep 17, 2026	11-50	19 contacts →
	Indirect evidence “Energieconcepten biedt duurzame energieoplossingen voor het verwarmen, ventileren, verlichten, sturen… van gebouwen.” Source: RevenueBase Database · checked Sep 17, 2026
11	Stiebel Eltron Belgium	Indirect evidence	Groot-bijgaarden, BelgiumHQ checked Sep 17, 2026	11-50	18 contacts →
	Indirect evidence “Stiebel Eltron is een internationale groep en behoort tot de wereldmarkt- en technologieleiders op het gebied van bouwdiensten en hernieuwbare energie.” Source: RevenueBase Database · checked Sep 17, 2026
12	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
13	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
14	Group BRS	Indirect evidence	Kortenberg, BelgiumHQ checked Sep 17, 2026	11-50	16 contacts →
	Indirect evidence “Vanuit Kortenberg realiseert Group BRS als Belgische aannemer renovatieprojecten voor eigenaars en beheerders van professionele gebouwen, hotels en appartementsgebouwen in heel…” Source: RevenueBase Database · checked Sep 17, 2026
15	Matriciel	Indirect evidence	Louvain-la-neuve, BelgiumHQ checked Sep 17, 2026	11-50	15 contacts →
	Indirect evidence “L'activité de la société MATRIciel vise une MEILLEURE PERFORMANCE ENERGETIQUE ET ENVIRONNEMENTALE DES BATIMENTS dans le cadre du développement durable par une participation active…” Source: RevenueBase Database · checked Sep 17, 2026
16	Ecosol	Indirect evidence	Peer, BelgiumHQ checked Sep 17, 2026	11-50	13 contacts →
	Indirect evidence “Ecosol+ is partner in je zoektocht naar de meest energie-onafhankelijke oplossingen voor HVAC.” Source: RevenueBase Database · checked Sep 17, 2026
17	Polydak	Indirect evidence	Lommel, BelgiumHQ checked Sep 17, 2026	51-200	13 contacts →
	Indirect evidence “We plaatsen, renoveren, herstellen en onderhouden platte daken.” Source: RevenueBase Database · checked Sep 17, 2026
18	Ensatec	Indirect evidence	Genk, BelgiumHQ checked Sep 17, 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 17, 2026
19	VDB Engineering	Indirect evidence	Mechelen, BelgiumHQ checked Sep 17, 2026	11-50	11 contacts →
	Indirect evidence “Bewust omgaan met energie is voor zowel bedrijven als particulieren een hot topic.” Source: RevenueBase Database · checked Sep 17, 2026
20	Benotec	Indirect evidence	Mechelen, BelgiumHQ checked Sep 17, 2026	11-50	11 contacts →
	Indirect evidence “Beter renoveren of BENOveren doe je samen met BENOTEC.” Source: RevenueBase Database · checked Sep 17, 2026
21	Proenergy	Indirect evidence	Ruiselede, BelgiumHQ checked Sep 17, 2026	11-50	11 contacts →
	Indirect evidence “Proenergy is een bedrijf dat in 2010 werd opgericht door Steven Roels, gedreven door een grote passie voor groene energie-installaties zoals zonnepanelen, warmtepompen…” Source: RevenueBase Database · checked Sep 17, 2026
22	Martha Bvba	Indirect evidence	Wilrijk, BelgiumHQ checked Sep 17, 2026	11-50	10 contacts →
	Indirect evidence “Algemeen aannemer gespecialiseerd in totaalrenovaties” Source: RevenueBase Database · checked Sep 17, 2026
23	Factor4	Indirect evidence	Antwerp, BelgiumHQ checked Sep 17, 2026	1-10	9 contacts →
	Indirect evidence “We are planning the path to climate neutrality.” Source: RevenueBase Database · checked Sep 17, 2026
24	CLEYS	Indirect evidence	Waasmunster, BelgiumHQ checked Sep 17, 2026	11-50	9 contacts →
	Indirect evidence “Cleys bv is jouw specialist in energetische renovaties.” Source: RevenueBase Database · checked Sep 17, 2026
25	Dauvister	Indirect evidence	Stavelot, BelgiumHQ checked Sep 17, 2026	51-200	9 contacts →
	Indirect 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 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: retrofit contractors. 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 retrofit contractors.
Partial evidence: Its own public description names part of retrofit contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name retrofit contractors. 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 205 retrofit contractors based in Belgium

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Retrofit contractors based in Belgium at a glance

As of Sep 17, 2026

42.2%Verified-email coverage

7.1Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · Bruxelles

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

127

11-50

51-200

201-500

501-1,000

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 205 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 retrofit contractors, 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 “retrofit contractors”. 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 retrofit contractors), 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 retrofit contractors, 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, 611 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 retrofit contractors, 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 retrofit contractors are there based in Belgium?

RevenueBase identified 205 retrofit contractors 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?

Renotec NV, headquartered in Belgium, tops this list with the largest team on record.

Which city has the most retrofit contractors?

Bruxelles leads with 5 headquartered companies, followed by Antwerpen (4) and Arendonk (4).

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 611 verified decision-maker contacts tracked across these 205 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.