Klett Ingenieur GmbH provides services across all fee phases under HOAI and offers electrotechnical consulting, planning and project management as well as automation and computer systems. At the balance sheet date the company employed 117 people and maintains branches in Meißen, Cologne, Hamburg and Würselen in addition to its headquarters in Stuttgart. The company's focus is on building services engineering for laboratory and institute buildings, school and lecture hall buildings, hospitals and industrial/production facilities (notably pharmaceutical and automotive industry), and it reports more than 2,000 projects completed successfully. The service portfolio also includes energy concepts, simulations and technical controlling; in 2024 the company further strengthened its profile in sustainable technologies and the integration of digital processing technologies. Klett - Ingenieur GmbH is a family business.
Elektrotechnische Beratung, Planung und Projektleitung für Baumaßnahmen, Automaisierungs- und Rechneranlagen aller Art. Unternehmensberatung im organisatorischen und vertrieblichen Bereich, elektrische Konstruktionen, Entwicklung elektrotechnischer Geräte, Erstellung von Rechnerprogranmen. Planung von verfahrenstechnischen Anlagen, Planung von heizungslüftungs- und sanitärtechnischen Anlagen, Durchführung von technischen Berechnungen aller Art.
Converted using the official Destatis and Eurostat correspondence tables; ISIC Rev. 4 is the United Nations' international industry classification.
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Source: German Commercial Register (Handelsregister) Stuttgart Local Court, HRB 261542 (as of 3 November 2026)
| Name | Type | City |
|---|---|---|
| Jens Klett | Geschäftsführer(in) | Meißen |
| Markus Menges | Geschäftsführer(in) | Fellbach |
Source: German Commercial Register (Handelsregister) Stuttgart Local Court, HRB 261542 (as of 3 November 2026)
| Date | Event Type | Event |
|---|---|---|
| 23.10.2025 | Registered Seat Change | Stuttgart |
| 23.10.2025 | Business Address Change | Kleiner Ostring 90, 70374 Stuttgart |
| 23.10.2025 | Gesellschaftsvertrag amended | Gesellschaftsvertrag |
| Date | Type | Change | Total Capital |
|---|---|---|---|
| 21.09.2006 | Share Capital Set | — | 50.000 € |
| Date | Contract | Value |
|---|---|---|
| 23.4.2026 | Supplier · Gene and Cell Therapies Incubator Berlin GmbH | — |
| 16.4.2026 | Supplier · Stadt Erkelenz Der Bürgermeister | — |
| 9.2.2026 | Planung TGA (inkl. AWT, Rohrpost) - IPA Neubau Zentrallabor Supplier · Universitätsklinikum Düsseldorf | — |
Source: German Commercial Register (Handelsregister) Stuttgart Local Court, HRB 261542 (as of 3 November 2026)
| Year | Revenue | Profit | Balance | Employees |
|---|---|---|---|---|
| 2024 | Rohergebnis€12.7M2 | €391,920 | €13,954,568 | — |
| 2023 | Rohergebnis€13.1M2 | €436,348 | €10,912,305 | — |
| 2022 | Rohergebnis€12.9M2 | €638,238 | €12,275,621 | — |
| 2021 | Rohergebnis€13.2M2 | €1,321,427 | €10,809,278 | — |
| 2020 | Rohergebnis€11.2M2 | €570,761 | €9,981,214 | — |
| 2019 | Rohergebnis€11.4M2 | €545,488 | €9,316,147 | — |
| 2018 | Rohergebnis€10M2 | €1,646 | €7,439,580 | — |
| 2017 | small company1 | — | €4,951,663 | — |
| 2016 | small company1 | — | €4,362,613 | — |
| 2015 | small company1 | -€40,835 | €5,627,206 | — |
1 Small companies are not required to publish a profit-and-loss statement (§ 326 (1) HGB). The figure shown is the statutory ceiling under § 267 HGB where the balance-sheet total makes it binding — a company may exceed at most one of the three size criteria.
2 Rohergebnis nach § 276 HGB: Umsatzerlöse abzüglich Materialaufwand bzw. Herstellungskosten. Kleine und mittelgroße Kapitalgesellschaften dürfen diese Posten zusammenfassen; die Umsatzerlöse selbst sind dann nicht veröffentlicht und liegen über dem Rohergebnis.
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Source: German Commercial Register (Handelsregister) Stuttgart Local Court, HRB 261542 (as of 3 November 2026)
| Cost type | Amount | Share |
|---|---|---|
| Personnel Costs | €10,012,073 | 97.4% |
| Depreciation | €250,809 | 2.4% |
| Interest & Similar | €19,271 | 0.2% |
