Company lists · Data refreshed September 2026

Top 25 Retrofit contractors based in the Netherlands

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 433 companies tracked

RevenueBase identified 433 retrofit contractors headquartered in the Netherlands as of September 2026 and tracks 3,647 professional contacts across them, including 1,436 with verified work emails. Apeldoorn is the largest hub.

This list covers retrofit contractors headquartered in the Netherlands, 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

433Companies

3,647Contacts tracked

1,436Verified emails

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The 25 largest retrofit contractors based in the Netherlands

Ranked by team size

Top 25 of 433 retrofit contractors based in the Netherlands, 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	Feenstra	Indirect evidence	Lelystad, NetherlandsHQ checked Sep 17, 2026	1,001-5,000	781 contacts →
	Indirect evidence “Sinds het ontstaan in 1947 is Feenstra marktleider in installatietechniek met een nationale dekking.” Source: RevenueBase Database · checked Sep 17, 2026
2	Saman Groep	Indirect evidence	Zierikzee, NetherlandsHQ checked Sep 17, 2026	201-500	211 contacts →
	Indirect evidence “De energietransitie is één van de grootste maatschappelijke opgaven, maar wij begrijpen dat jouw wooncomfort net zo belangrijk is.” Source: RevenueBase Database · checked Sep 17, 2026
3	Takkenkamp Vastgoed Verduurzamers	Indirect evidence	Apeldoorn, NetherlandsHQ checked Sep 17, 2026	501-1,000	96 contacts →
	Indirect evidence “Takkenkamp Vastgoed Verduurzamers kent een voorgeschiedenis van meer dan 85 jaar.” Source: RevenueBase Database · checked Sep 17, 2026
4	Rendon Onderhoudsgroep Onderhoud & Renovatie	Indirect evidence	Voorburg · Werkendam · Haarlem · Eindhoven, NetherlandsHQ checked Sep 17, 2026	51-200	71 contacts →
	Indirect evidence “Jij geniet.” Source: RevenueBase Database · checked Sep 17, 2026
5	VAN Hout Adviseurs EN Installateurs	Indirect evidence	Veldhoven, NetherlandsHQ checked Sep 17, 2026	51-200	63 contacts →
	Indirect evidence “Van Hout loopt voorop op het gebied van werktuigbouwkundige installatietechniek en duurzame energie.” Source: RevenueBase Database · checked Sep 17, 2026
6	Peters Installatietechniek	Indirect evidence	Zevenaar, NetherlandsHQ checked Sep 17, 2026	51-200	54 contacts →
	Indirect evidence “Dé specialist voor advies, plaatsing en onderhoud van duurzame, innovatieve en prefab klimaatinstallaties.” Source: RevenueBase Database · checked Sep 17, 2026
7	Breman Zuid	Indirect evidence	Drunen, NetherlandsHQ checked Sep 17, 2026	51-200	45 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
8	LEK Habo	Indirect evidence	Bodegraven, NetherlandsHQ checked Sep 17, 2026	51-200	44 contacts →
	Indirect evidence “Lek/Habo is specialized in the engineering, installation and maintenance of sustainable energy installations.” Source: RevenueBase Database · checked Sep 17, 2026
9	isolatiespecialist.nl	Indirect evidence	Moerkapelle, NetherlandsHQ checked Sep 17, 2026	51-200	43 contacts →
	Indirect evidence “Isolatiespecialist.nl is een vertrouwde partner voor vele aannemers en woningcorporaties, betrokken bij het isoleren van zowel woningen als bedrijfspanden.” Source: RevenueBase Database · checked Sep 17, 2026
10	Takkenkamp Groep	Indirect evidence	Apeldoorn, NetherlandsHQ checked Sep 17, 2026	501-1,000	43 contacts →
	Indirect evidence “Takkenkamp Groep is een leidend specialist in isolatie, restauratie, gevelonderhoud, steigerbouw, kunststof kozijnen en isolatieglas.” Source: RevenueBase Database · checked Sep 17, 2026
11	Thermosolutions BV	Indirect evidence	Enschede, NetherlandsHQ checked Sep 17, 2026	51-200	43 contacts →
	Indirect evidence “With ThermoSolutions, you will be kept warm.” Source: RevenueBase Database · checked Sep 17, 2026
12	isolatie.com	Indirect evidence	Handel, NetherlandsHQ checked Sep 17, 2026	51-200	42 contacts →
	Indirect evidence “Isolatie.com is een snel groeiend, modern en servicegericht bedrijf waar we jouw binnenklimaat naar een hoger niveau tillen!” Source: RevenueBase Database · checked Sep 17, 2026
13	VAN Lochem Nederland Totaalonderhoud	Indirect evidence	Den Haag, NetherlandsHQ checked Sep 17, 2026	201-500	41 contacts →
	Indirect evidence “Van Lochem Nederland is een familiebedrijf opgericht in 1969 en specialist in Planmatig Onderhoud, Renovatie, Transformatie én Verduurzaming van vastgoed.” Source: RevenueBase Database · checked Sep 17, 2026
14	NEW Energy Systems	Indirect evidence	Schimmert, NetherlandsHQ checked Sep 17, 2026	51-200	40 contacts →
	Indirect evidence “New Energy Systems adviseert, ontwerpt, levert en installeert systemen voor de opwekking en het gebruik van duurzame energie in woon- en werkomgevingen.” Source: RevenueBase Database · checked Sep 17, 2026
15	Klimaatgarant	Indirect evidence	Schiedam, NetherlandsHQ checked Sep 17, 2026	51-200	40 contacts →
	Indirect evidence “25 jaar gegarandeerd energieneutraal Klimaatgarant zorgt voor de best mogelijke energieprestatie van woningen.” Source: RevenueBase Database · checked Sep 17, 2026
16	Emondt Multiclima L Emondt Koeltechniek	Indirect evidence	Enschede, NetherlandsHQ checked Sep 17, 2026	51-200	36 contacts →
	Indirect evidence “Emondt Multiclima l Emondt Koeltechniek In nauwe samenwerking met onze klanten ontwerpen, leveren en installeren wij landelijk duurzame en energiezuinige koel- en klimaatprojecten.” Source: RevenueBase Database · checked Sep 17, 2026
17	Bouwmeester Aannemersbedrijf	Indirect evidence	Den Haag, NetherlandsHQ checked Sep 17, 2026	51-200	35 contacts →
	Indirect evidence “Bouwmeester Aannemersbedrijf; sterk in totaalonderhoud door onze veelzijdigheid aan medewerkers.” Source: RevenueBase Database · checked Sep 17, 2026
18	Locas Installatietechniek	Indirect evidence	Haarlem, NetherlandsHQ checked Sep 17, 2026	51-200	33 contacts →
	Indirect evidence “Als duurzame totaalinstallateur staan wij bekend om onze expertise in het ontwerpen, installeren en onderhouden van energie-efficiënte systemen.” Source: RevenueBase Database · checked Sep 17, 2026
19	Hartman Installatie	Indirect evidence	Urk, NetherlandsHQ checked Sep 17, 2026	51-200	32 contacts →
	Indirect evidence “Bij Hartman Installatie in Urk, Hardenberg en Zwolle werken we elke dag aan duurzaam comfort.” Source: RevenueBase Database · checked Sep 17, 2026
20	dle.energy	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 17, 2026	11-50	25 contacts →
	Indirect evidence “DLE biedt vastgoedbeheerders, investeerders en eigenaren van commercieel vastgoed een totaaloplossing om de energieprestaties van hun panden te optimaliseren.” Source: RevenueBase Database · checked Sep 17, 2026
21	DE Nieuwe Norm	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 17, 2026	11-50	25 contacts →
	Indirect evidence “Elk gebouw raakt vroeg of laat uit vorm.” Source: RevenueBase Database · checked Sep 17, 2026
22	Kingspan Insulated Panels Netherlands	Indirect evidence	Tiel, NetherlandsHQ checked Sep 17, 2026	n/a	24 contacts →
	Indirect evidence “At Kingspan, we're on a mission to transform the built environment through inspiration, innovation and insight.” Source: RevenueBase Database · checked Sep 17, 2026
23	Wibro Isolatie EN Renovatie B.V	Indirect evidence	Heerle, NetherlandsHQ checked Sep 17, 2026	11-50	24 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
24	Unica Energy Solutions	Indirect evidence	Hoevelaken, NetherlandsHQ checked Sep 17, 2026	51-200	23 contacts →
	Indirect evidence “Unica Energy Solutions maakt de energietransitie waar!” Source: RevenueBase Database · checked Sep 17, 2026
25	VAN DEN Hoff Installatiebedrijf BV	Indirect evidence	Eindhoven, NetherlandsHQ checked Sep 17, 2026	11-50	21 contacts →
	Indirect evidence “VAN DEN HOFF Installatiebedrijf is al bijna 85 jaar vakkundig en energiek aan de slag in de installatiebranche in de regio Eindhoven.” 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 433 retrofit contractors based in the Netherlands

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Retrofit contractors based in the Netherlands at a glance

As of Sep 17, 2026

39.4%Verified-email coverage

8.4Average contacts per company

1-10Median size (employees)

1.8%Largest-city concentration · Apeldoorn

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

233

11-50

149

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for Netherlands, so it is reported there. Company counts and contact totals on this page are exact for Netherlands, over 433 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 the Netherlands 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 Netherlands 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, 1,436 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 the Netherlands?

RevenueBase identified 433 retrofit contractors headquartered in the Netherlands 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?

Feenstra, headquartered in Lelystad, tops this list with the largest team on record.

Which city has the most retrofit contractors?

Apeldoorn leads with 8 headquartered companies, followed by Utrecht (8) and Den Haag (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 1,436 verified decision-maker contacts tracked across these 433 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.