Dornhoefer GmbH plans, installs and maintains technical systems and equipment in automation, electrical, sanitary, heating, sprinkler, ventilation and air conditioning technology including pipeline construction and trades in relevant devices and apparatus. According to the management report its service range includes consulting, planning, project engineering, assembly, installation, commissioning as well as maintenance, customer service, servicing, switchgear production and metalworking. Founded in 1906, the mid-sized family company is headquartered in Mainz and operates additional sites in Alzey, Bad Kreuznach, Darmstadt, Frankfurt am Main, Geisenheim, Rüsselsheim and Ludwigshafen, focusing on the Rhine‑Main‑Nahe region. With an average of 328 employees in 2024 and the ability to act as a general contractor offering complete solutions, the company combines engineering expertise with in‑house staff and manufacturing capacities.
Die Planung, Ausführung und Wartung aller technischen Anlagen und Einrichtungen auf dem Gebiet der Automatisierungs-, Elektro-, Gesundheits-, Heizungs-, Sprinkler-, Lüftungs- und Klimatechnik einschließlich Rohrleitungsbau sowie der Handel mit allen einschlägigen Geräten und Apparaturen.
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) Mainz Local Court, HRB 112 (as of 3 November 2026)
| Name | Type | City |
|---|---|---|
| Michéll Konrath | Geschäftsführer(in) | Wolfsheim |
| Reimund Niederhöfer | Geschäftsführer(in) | Mainz |
| Thomas Schmitt | Geschäftsführer(in) | Oppenheim |
Source: German Commercial Register (Handelsregister) Mainz Local Court, HRB 112 (as of 3 November 2026)
| Date | Event Type | Event |
|---|---|---|
| 06.09.2022 | Gesellschaftsvertrag amended | Gesellschaftsvertrag |
| 03.08.2016 | Gesellschaftsvertrag amended | Gesellschaftsvertrag |
| 10.06.2010 | Business Address Change | Hochheimer Straße 63-65, 55246 MainzKostheim |
| Date | Type | Change | Total Capital |
|---|---|---|---|
| 06.09.2022 | Capital Increase | +1.500.000 € | 4.000.000 € |
| 22.11.2005 | Share Capital Set | — | 2.500.000 € |
| Date | Contract | Value |
|---|---|---|
| 22.6.2026 | Supplier · Universitätsklinikum Mannheim GmbH | — |
Source: German Commercial Register (Handelsregister) Mainz Local Court, HRB 112 (as of 3 November 2026)
| Year | Revenue | Profit | Balance | Employees |
|---|---|---|---|---|
| 2024 | €50,591,428 | €2,468,684 | €27,597,666 | — |
| 2023 | €44,218,419 | €2,805,535 | €27,895,383 | — |
| 2022 | €53,819,622 | €2,141,201 | €29,799,522 | — |
| 2021 | €52,003,968 | €2,546,779 | €28,377,533 | — |
| 2020 | €44,660,521 | €757,901 | €24,485,998 | — |
| 2019 | €42,391,430 | €173,040 | €23,406,510 | — |
| 2018 | €51,824,406 | €375,873 | €22,904,484 | — |
| 2017 | €51,493,945 | €703,901 | €23,462,014 | — |
| 2016 | €50,529,858 | €672,599 | €21,986,507 | — |
| 2015 | €43,960,718 | €802,694 | €21,735,459 | — |
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Source: German Commercial Register (Handelsregister) Mainz Local Court, HRB 112 (as of 3 November 2026)
| Cost type | Amount | Share |
|---|---|---|
| Personnel Costs | €18,298,996 | 48.6% |
| Material Costs | €18,408,455 | 48.9% |
| Depreciation | €778,670 | 2.1% |
| Interest & Similar | €142,991 | 0.4% |
