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 company matches for retrofit contractors associated with Belgium as of September 2026 and tracks 1,447 professional contacts across them, including 611 with verified work emails. Brussels is the largest hub.

This list covers company matches for retrofit contractors associated with Belgium, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 17, 2026 How this list was built

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 company matches for retrofit contractors based in Belgium, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Renotec NV	Exact match	Geel, BelgiumHQ recorded Sep 17, 2026	501-1,000	342 contacts →
	Exact match “Renotec is een gespecialiseerde hoofdaannemer die zich focust op energetische renovatie- en restauratiewerken en geeft zo gebouwen, monumenten, kunstwerken en ondergrondse…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	Reno Energy	Exact match	Liège (angleur), BelgiumHQ recorded Sep 17, 2026	51-200	106 contacts →
	Exact match “Reno Energy est une entreprise spécialisée dans le secteur de la rénovation énergétique mais aussi dans la nouvelle construction.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	SIX Izegem	Exact match	Izegem, BelgiumHQ recorded Sep 17, 2026	201-500	35 contacts →
	Exact match “SIX staat voor kwaliteit en standvastigheid, zoveel is zeker.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	Goessens	Exact match	Hannut, BelgiumHQ recorded Sep 17, 2026	51-200	31 contacts →
	Exact match “Goessens est une société spécialisée dans l'installation de systèmes de chauffage, de ventilation et de climatisation.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	AIR Ambiance SA	Exact match	Battice, BelgiumHQ recorded Sep 17, 2026	11-50	28 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	QUITO	Exact match	Noville-les-bois, BelgiumHQ recorded Sep 17, 2026	1-10	27 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Group VHC	Exact match	Overijse, BelgiumHQ recorded Sep 17, 2026	51-200	24 contacts →
	Exact match “Group VHC zorgt al meer dan 25 jaar voor slimme oplossingen in verwarming, koeling, ventilatie en zonne energie.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Ecopuur	Exact match	9850, BelgiumHQ recorded Sep 17, 2026	11-50	23 contacts →
	Exact match “Ecopuur bekijkt het verbruikspatroon van je huidige of nieuwe woning.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Soltis	Exact match	Evere, BelgiumHQ recorded Sep 17, 2026	11-50	23 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Energieconcepten	Exact match	Arendonk, BelgiumHQ recorded Sep 17, 2026	11-50	19 contacts →
	Exact match “Energieconcepten biedt duurzame energieoplossingen voor het verwarmen, ventileren, verlichten, sturen… van gebouwen.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Stiebel Eltron Belgium	Exact match	Groot-bijgaarden, BelgiumHQ recorded Sep 17, 2026	11-50	18 contacts →
	Exact match “Stiebel Eltron is een internationale groep en behoort tot de wereldmarkt- en technologieleiders op het gebied van bouwdiensten en hernieuwbare energie.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Isolution	Exact match	Namur, BelgiumHQ recorded Sep 17, 2026	11-50	17 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Alfasun	Exact match	Ninove, BelgiumHQ recorded Sep 17, 2026	11-50	17 contacts →
	Exact match “nergie zonder zorgen Ga je bouwen?” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	Group BRS	Exact match	Kortenberg, BelgiumHQ recorded Sep 17, 2026	11-50	16 contacts →
	Exact match “Vanuit Kortenberg realiseert Group BRS als Belgische aannemer renovatieprojecten voor eigenaars en beheerders van professionele gebouwen, hotels en appartementsgebouwen in heel…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	Matriciel	Exact match	Louvain-la-neuve, BelgiumHQ recorded Sep 17, 2026	11-50	15 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Ecosol	Exact match	Peer, BelgiumHQ recorded Sep 17, 2026	11-50	13 contacts →
	Exact match “Ecosol+ is partner in je zoektocht naar de meest energie-onafhankelijke oplossingen voor HVAC.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	Polydak	Exact match	Lommel, BelgiumHQ recorded Sep 17, 2026	51-200	13 contacts →
	Exact match “We plaatsen, renoveren, herstellen en onderhouden platte daken.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	Ensatec	Exact match	Genk, BelgiumHQ recorded Sep 17, 2026	1-10	12 contacts →
	Exact match “Wij helpen jouw bedrijf van A tot Z om maatschappelijk verantwoord te ondernemen en op drie cruciale vlakken winst te boeken.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	VDB Engineering	Exact match	Mechelen, BelgiumHQ recorded Sep 17, 2026	11-50	11 contacts →
	Exact match “Bewust omgaan met energie is voor zowel bedrijven als particulieren een hot topic.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	Benotec	Exact match	Mechelen, BelgiumHQ recorded Sep 17, 2026	11-50	11 contacts →
	Exact match “Beter renoveren of BENOveren doe je samen met BENOTEC.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	Proenergy	Exact match	Ruiselede, BelgiumHQ recorded Sep 17, 2026	11-50	11 contacts →
	Exact match “Proenergy is een bedrijf dat in 2010 werd opgericht door Steven Roels, gedreven door een grote passie voor groene energie-installaties zoals zonnepanelen, warmtepompen…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Martha Bvba	Exact match	Wilrijk, BelgiumHQ recorded Sep 17, 2026	11-50	10 contacts →
	Exact match “Algemeen aannemer gespecialiseerd in totaalrenovaties” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Factor4	Exact match	Antwerp, BelgiumHQ recorded Sep 17, 2026	1-10	9 contacts →
	Exact match “We are planning the path to climate neutrality.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	CLEYS	Exact match	Waasmunster, BelgiumHQ recorded Sep 17, 2026	11-50	9 contacts →
	Exact match “Cleys bv is jouw specialist in energetische renovaties.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	Dauvister	Exact match	Stavelot, BelgiumHQ recorded Sep 17, 2026	51-200	9 contacts →
	Exact match “Dauvister (170+ employees, 30M€ turnover) studies, installs and maintains energy efficency systems for homeowners as well as for large companies.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “retrofit contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 205 retrofit contractors based in Belgium

See the full list, filter by size, metro and specialty, and access 611 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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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)

2.9%Largest-city concentration · Brussels

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Belgium whose business descriptions match “retrofit contractors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 611 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “retrofit contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many retrofit contractors are there based in Belgium?

RevenueBase identified 205 company matches for retrofit contractors associated with Belgium as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Renotec NV tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most retrofit contractors?

Brussels leads with 6 company records, followed by Antwerp (5) and Arendonk (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 611 professional contacts with verified work emails tracked across these 205 companies; direct dials are available where recorded.

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 SmartSearch, 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.