Company lists · Data refreshed September 2026

Top 25 Building decarbonization firms based in Germany

Name: Building decarbonization firms based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 933 companies tracked

RevenueBase identified 933 building decarbonization firms headquartered in Germany as of September 2026 and tracks 7,416 professional contacts across them, including 2,762 with verified work emails. Berlin is the largest hub.

This list covers building decarbonization firms headquartered in Germany, 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

933Companies

7,416Contacts tracked

2,762Verified emails

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The 25 largest building decarbonization firms based in Germany

Ranked by team size

Top 25 of 933 building decarbonization firms based in Germany, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to building decarbonization firms: 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	ISTA	Indirect evidence	Essen, GermanyHQ checked Sep 16, 2026	5,001-10,000	1,406 contacts →
	Indirect evidence “Wir geben Häusern eine Zukunft.” Source: RevenueBase Database · checked Sep 16, 2026
2	Kieback&peter	Partial evidence	Berlin, GermanyHQ checked Sep 16, 2026	1,001-5,000	580 contacts →
	Partial evidence “Our DNA are sustainable buildings As a Smart Building Solutioneer, we combine intelligent building technologies, data-based services, sustainable excellence and multiple synergy…” Source: RevenueBase Database · checked Sep 16, 2026
3	Westbridge Advisory	Indirect evidence	Frankfurt, GermanyHQ checked Sep 16, 2026	51-200	147 contacts →
	Indirect evidence “Wir sind ein führender europäischer Energie- und Nachhaltigkeitsberater in der Immobilienwirtschaft.” Source: RevenueBase Database · checked Sep 16, 2026
4	MVV Enamic Gmbh	Indirect evidence	Mannheim, GermanyHQ checked Sep 16, 2026	201-500	92 contacts →
	Indirect evidence “MVV Enamic bietet als B2B-Lösungseinheit der MVV Energie AG Geschäftskunden ganzheitliche Energielösungen aus einer Hand.” Source: RevenueBase Database · checked Sep 16, 2026
5	Einhundert	Indirect evidence	Köln, GermanyHQ checked Sep 16, 2026	51-200	87 contacts →
	Indirect evidence “Your partner for the energy transition in the real estate industry Since 2017, einhundert Energie GmbH has been supporting real estate companies in electrifying and decarbonizing…” Source: RevenueBase Database · checked Sep 16, 2026
6	Fuchs & Eule	Indirect evidence	Metropolregion Berlin/brandenburg, GermanyHQ checked Sep 16, 2026	51-200	81 contacts →
	Indirect evidence “Wir wollen, dass so viele Immobilien wie möglich energieeffizient saniert werden.” Source: RevenueBase Database · checked Sep 16, 2026
7	Enloc AG	Indirect evidence	Dresden, GermanyHQ checked Sep 16, 2026	51-200	80 contacts →
	Indirect evidence “ENLOC – Energiedienstleister der Wohnungswirtschaft Die Enloc bietet innovative Lösungen unter Einbeziehung erneuerbarer Energien im Rahmen der Wärmelieferung/Contracting.” Source: RevenueBase Database · checked Sep 16, 2026
8	First Climate	Indirect evidence	Bad Vilbel, GermanyHQ checked Sep 16, 2026	51-200	79 contacts →
	Indirect evidence “With 25 years of experience, First Climate is a leading global provider of carbon management and green energy services for hundreds of corporate and public sector clients.” Source: RevenueBase Database · checked Sep 16, 2026
9	Empact Gmbh	Indirect evidence	Köln, GermanyHQ checked Sep 16, 2026	51-200	73 contacts →
	Indirect evidence “Wir bringen grüne Infrastruktur in Ihre Gebäude!” Source: RevenueBase Database · checked Sep 16, 2026
10	Transsolar Klimaengineering	Indirect evidence	Stuttgart, GermanyHQ checked Sep 16, 2026	51-200	64 contacts →
	Indirect evidence “High Comfort – Low Impact Transsolar KlimaEngineering ist ein international tätiges Ingenieurbüro.” Source: RevenueBase Database · checked Sep 16, 2026
11	Fact Gmbh Efacilities Solutions	Indirect evidence	Boblingen, GermanyHQ checked Sep 16, 2026	51-200	61 contacts →
	Indirect evidence “FACT.” Source: RevenueBase Database · checked Sep 16, 2026
12	Alpha IC Gmbh	Indirect evidence	Bamberg, GermanyHQ checked Sep 16, 2026	51-200	58 contacts →
	Indirect evidence “Die Alpha IC ist ein inhabergeführtes Consultingbüro für das Real Estate Management.” Source: RevenueBase Database · checked Sep 16, 2026
13	BFE Institut FÜR Energie UND Umwelt Gmbh	Indirect evidence	Mannheim, GermanyHQ checked Sep 16, 2026	51-200	57 contacts →
	Indirect evidence “Das BFE Institut für Energie und Umwelt GmbH ist ein Unternehmen der MVV Energie AG und zählt mit über Projekten und ca.” Source: RevenueBase Database · checked Sep 16, 2026
14	Envistra Gmbh	Indirect evidence	Hürth, GermanyHQ checked Sep 16, 2026	51-200	57 contacts →
	Indirect evidence “Die Dienstleistungen der envistra GmbH zielen auf eine schnelle und langfristige Kostenreduktion und leisten einen wesentlichen Beitrag zu einer nachhaltigen…” Source: RevenueBase Database · checked Sep 16, 2026
15	Purpose Green	Indirect evidence	Berlin, GermanyHQ checked Sep 16, 2026	51-200	53 contacts →
	Indirect evidence “End-to-end solution for energy retrofits and long-term ESG management.” Source: RevenueBase Database · checked Sep 16, 2026
16	Wolff & Müller Energy Gmbh	Indirect evidence	Ludwigsburg, GermanyHQ checked Sep 16, 2026	51-200	49 contacts →
	Indirect evidence “WOLFF & MÜLLER ENERGY GMBH ist Teil der traditionsreichen Unternehmensgruppe WOLFF & MÜLLER, einem mittelständischen Familienunternehmen mit Stammsitz in Stuttgart.” Source: RevenueBase Database · checked Sep 16, 2026
17	42watt	Partial evidence	Munich, GermanyHQ checked Sep 16, 2026	51-200	47 contacts →
	Partial evidence “In a market full of complexity and empty promises, 42watt makes energy-efficient building modernization simple, reliable, and actionable.” Source: RevenueBase Database · checked Sep 16, 2026
18	E-Con	Indirect evidence	Memmingen, GermanyHQ checked Sep 16, 2026	51-200	47 contacts →
	Indirect evidence “e-con AG Die e-con AG ist seit 20 Jahren im Einsatz für erneuerbare Energien und versteht sich als Partner für die Energiewende.” Source: RevenueBase Database · checked Sep 16, 2026
19	Ökotec Energiemanagement Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 16, 2026	51-200	46 contacts →
	Indirect evidence “Since its founding 20 years ago, ÖKOTEC stands for intelligent solutions for the reduction of energy and resource consumption.” Source: RevenueBase Database · checked Sep 16, 2026
20	Egs-Plan Gmbh	Indirect evidence	Stuttgart, GermanyHQ checked Sep 16, 2026	51-200	45 contacts →
	Indirect evidence “Wir entwickeln energieeffiziente Gebäude und klimaneutrale Quartiere für die Zukunft.” Source: RevenueBase Database · checked Sep 16, 2026
21	Präg Gruppe	Indirect evidence	Kempten (allgäu), GermanyHQ checked Sep 16, 2026	201-500	45 contacts →
	Indirect evidence “ENERGIE IN VIELEN FACETTEN PRÄG berät seine Kunden in allen Energiefragen und deckt die gesamte Bandbreite des Energiebedarfs ab: von der Mobilität, über die Wärmeversorgung, bis…” Source: RevenueBase Database · checked Sep 16, 2026
22	Futurecamp Climate Gmbh	Indirect evidence	München, GermanyHQ checked Sep 16, 2026	51-200	44 contacts →
	Indirect evidence “Nachhaltige Transformation für eine zukunftsfähige Wirtschaft Als spezialisierte Unternehmensberatung für Emissionshandel, CBAM, Treibhausgasbilanzierung, Energieeffizienz sowie…” Source: RevenueBase Database · checked Sep 16, 2026
23	MEO Carbon Solutions	Indirect evidence	Cologne, GermanyHQ checked Sep 16, 2026	11-50	43 contacts →
	Indirect evidence “Meo Carbon Solutions (MCS) is an independent consulting company experienced in sustainable and future-oriented solutions.” Source: RevenueBase Database · checked Sep 16, 2026
24	Bode Unternehmensgruppe	Indirect evidence	Münster, GermanyHQ checked Sep 16, 2026	51-200	42 contacts →
	Indirect evidence “Der Generalplaner für nachhaltiges Bauen & Sanieren Wir sind Ihr unabhängiger Partner für Energieberatung, Fördermittelmanagement und die energieeffiziente Planung und Umsetzung…” Source: RevenueBase Database · checked Sep 16, 2026
25	Averdung Ingenieure & Berater Gmbh	Indirect evidence	Hamburg, GermanyHQ checked Sep 16, 2026	51-200	41 contacts →
	Indirect evidence “Als Problemlöser und Beschleuniger für die Energiewende leisten wir unseren Beitrag als kreativer und kompetenter Partner.” 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 decarbonization firms. 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 decarbonization firms.
Partial evidence: Its own public description names part of building decarbonization firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building decarbonization firms. 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 933 building decarbonization firms based in Germany

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Building decarbonization firms based in Germany at a glance

As of Sep 16, 2026

37.2%Verified-email coverage

7.9Average contacts per company

1-10Median size (employees)

8.5%Largest-city concentration · Berlin

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

618

11-50

216

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 933 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 decarbonization firms, 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 Germany whose own description of what they do matches “building decarbonization firms”. 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 decarbonization firms), 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 decarbonization firms, and records with no verified work email. Companies headquartered outside Germany 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, 2,762 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.

Building decarbonization firms by metro

Building decarbonization firms in Berlin79
Building decarbonization firms in Hamburg39
Building decarbonization firms in Munchen27

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 decarbonization firms, 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 decarbonization firms are there based in Germany?

RevenueBase identified 933 building decarbonization firms headquartered in Germany 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?

ISTA, headquartered in Essen, tops this list with the largest team on record.

Which city has the most building decarbonization firms?

Berlin leads with 79 headquartered companies, followed by Hamburg (39) and Munchen (27).

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 2,762 verified decision-maker contacts tracked across these 933 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.