Company lists · Data refreshed September 2026
Top 25 Retrofit consultants based in Germany
RevenueBase identified 1,853 retrofit consultants headquartered in Germany as of September 2026 and tracks 9,539 professional contacts across them, including 3,239 with verified work emails. Berlin is the largest hub.
This list covers retrofit consultants 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 29, 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.
The 25 largest retrofit consultants based in Germany
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 270 contacts → | ||||
Indirect evidence “SSF is a consulting engineering company owned and operated by German engineers committed to the art of civil, structural and geotechnical engineering specializing in bridges…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 225 contacts → | ||||
Indirect evidence “Structural Consulting Engineers Consulting Engineers for Renewable Energy and Solar Power Technology Checking Engineers for Stability und Structural Engineering Our focus lies on…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 169 contacts → | ||||
Indirect evidence “We have a passion for innovative and sustainable concepts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 119 contacts → | ||||
Indirect evidence “Der Gottlob-Rommel-Gruppe, ein Unternehmen für Bauleistungen und Gebäudetechnik, ist in den letzten Jahrzehnten etwas Besonderes gelungen: die Transformation vom traditionellen…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 112 contacts → | ||||
Indirect evidence “Our mission is to drive progress for the construction industry through intelligent and lean engineering solutions that make a difference.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 101 contacts → | ||||
Indirect evidence “BMP, gegründet 1996, ist ein unabhängiger Dienstleister im Bereich Projektentwicklung, Projektmanagement und Baumanagement mit Hauptsitz in Köln sowie Niederlassungen in Berlin…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 93 contacts → | ||||
Indirect evidence “Gebäude.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 85 contacts → | ||||
Indirect evidence “Die ZM-I Gruppe ist eine unabhängige, partnerschaftlich organisierte Ingenieurgesellschaft für anspruchsvolle Bauprojekte.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 76 contacts → | ||||
Indirect evidence “Designing the world around us means to take responsibility: as engineers and architects we implement a variety of challenging construction projects- On the domestic market and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 76 contacts → | ||||
Indirect evidence “ICL ist eines der führenden national und international tätigen Ingenieur Consulting Unternehmen in Deutschland, mit jahrzehntelanger Expertise und Erfahrung in der Beratung…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 74 contacts → | ||||
Indirect evidence “knippershelbig is an engineering firm which operates domestically and internationally and employs 100 people in Stuttgart, New York and Berlin.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 66 contacts → | ||||
Indirect evidence “SWJ - Experten für innovative Lösungen Die Erbringung von Consulting, Ingenieur und Architekturdienstleistungen aller Art im Industrie- und Privatsektor und der öffentlichen Hand…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 62 contacts → | ||||
Indirect evidence “Kohlbecker was founded by Karl Kohlbecker in 1930.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 60 contacts → | ||||
Indirect evidence “1966 als Planungs- und Beratungsgesellschaft für Ingenieur- und Architekturleistungen im Bauwesen gegründet, entwickelte sich die SEHLHOFF GMBH, INGENIEURE + ARCHITEKTEN zu einem…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 59 contacts → | ||||
Indirect evidence “Wandelbarkeit, Energieeffizienz und attraktive Mehrwerträume für Gebäude" Die SSP AG ist eines der national führenden integralen Planungsbüros mit derzeit rund 270…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 58 contacts → | ||||
Indirect evidence “Die Alpha IC ist ein inhabergeführtes Consultingbüro für das Real Estate Management.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 58 contacts → | ||||
Indirect evidence “Assmann Emutec ist ein Unternehmen des BKW Engineering - Network of Excellence® – dem größten Engineering Netzwerk im deutschsprachigen Raum.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 53 contacts → | ||||
Partial evidence “End-to-end solution for energy retrofits and long-term ESG management.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 51 contacts → | ||||
Indirect evidence “Seit über 65 Jahren ist Harrer Ingenieure eigenverantwortlich und unabhängig als Beratende Ingenieur*innen auf allen Gebieten des Bauwesens tätig.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 49 contacts → | ||||
Indirect evidence “Wir sind ein junges Beratungsunternehmen in der Bau- und Immobilienbranche und unterstützen unsere Auftraggebenden bei der Entwicklung und der Gestaltung effektiver…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 47 contacts → | ||||
Indirect 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 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 47 contacts → | ||||
Indirect evidence “nps ist ein unabhängiges, inhabergeführtes Ingenieurbüro mit den Schwerpunkten Projektmanagement, Projektentwicklung, Nachhaltigkeit und Infrastrukturmanagement.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 39 contacts → | ||||
Indirect evidence “Wir planen, errichten und betreuen Gebäude, die für ihren kompletten Lebenszyklus an Mensch und Umwelt ausgerichtet sind.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 38 contacts → | ||||
Indirect evidence “Seit mehr als 65 Jahren sind wir als Ingenieurbüro für technische Gebäudeausrüstung ein verlässlicher Partner.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
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 consultants. 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 consultants.
- Partial evidence
- Its own public description names part of retrofit consultants, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name retrofit consultants. 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 1,853 retrofit consultants based in Germany
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Retrofit consultants based in Germany at a glance
As of Sep 29, 2026Companies by employee count
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 1,853 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 consultants, 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 “retrofit consultants”. 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 consultants), 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 consultants, 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, 3,239 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 29, 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.
Retrofit consultants by metro
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 consultants, 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 consultants are there based in Germany?
RevenueBase identified 1,853 retrofit consultants 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?
SSF Ingenieure AG, headquartered in Munchen, tops this list with the largest team on record.
Which city has the most retrofit consultants?
Berlin leads with 119 headquartered companies, followed by Hamburg (75) and Munchen (67).
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 3,239 verified decision-maker contacts tracked across these 1,853 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 29, 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.
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