Infrastructure is more than technology. It connects people, creates quality of life, and forms the foundation for a successful future. Whether it's safe water supply, efficient transportation routes, or sustainable drainage systems – today's solutions shape tomorrow's living and working environments. At Spieth Ingenieure, people are at the center of everything we do. With expertise, experience, and passion, we develop customized solutions that meet our clients' requirements while creating sustainable value for municipalities, companies, and society. We view each project as an opportunity to improve living environments, enable development, and shape the future responsibly.
Founded1955
Completed projects2541
Employees125
Locations10
Our Philosophy
“The philosophy of our daily work is to secure and improve people's quality of life, preserve prosperity, and protect the environment.”
At Spieth Ingenieure, this also means continuously evolving and constantly questioning our actions. Only in this way can we succeed in bringing ecology, economy, and social responsibility into balance through our work. At Spieth Ingenieure, we don't work with standard solutions. We view each project as an individual challenge to realize the best possible outcome for our client. We communicate transparently and openly at all times. Because only satisfied clients are the best recommendation for our future.
History
New shareholders as of January 1, 2026
On January 1, 2026, the company expanded its shareholder group: Jessica Anhalt-Rupp, Benjamin Bär, David Bendel, Steffen Bühring, Phillip Degen, Ben Horsmann, Simon Kissel, Sascha Mack, and Dorothea Steinfeld joined as new shareholders, strengthening the company's future direction.
Photo: Shareholders of Ingenieurbüro Fritz Spieth Beratende Ingenieure GmbH
New locations in Leipzig and Tauberbischofsheim and investment in DC Alliance GmbH
In 2025, the company continued to grow: A new location was established in Leipzig, and in Tauberbischofsheim, Ingenieurbüro Fritz Spieth became a shareholder in IBU Ingenieurgesellschaft für Bauwesen und Umwelttechnik mbH and additionally founded its own office. Furthermore, the company invested in DC Alliance GmbH to specifically expand its competencies in data center and infrastructure development.
Photo: Leipzig office
Acquisition of IST Ingenieurgesellschaft and founding of the Munich office
The acquisition of IST Ingenieurgesellschaft in Sinsheim created a new office location, further expanding regional strength in Baden-Württemberg. At the same time, the founding of the Munich office marked an important step in the expansion to Bavaria and opened up additional market opportunities in southern Germany.
Relocation to Euskirchen
The Weilerswist office was strategically realigned as part of the merger with the Ingenieurbüro Klaus Hüllbrock. In April 2022, the location was moved to Euskirchen in the "Alte Tuchfabrik" and the Euskirchen office was founded. With this step, Ingenieurbüro Fritz Spieth consolidated its competencies in the North Rhine-Westphalia region.
Photo: Euskirchen office
Expansion of presence in Baden-Württemberg and sale of INFRA Ingenieurgesellschaft
With the founding of the Schwäbisch Hall office, the regional presence in Baden-Württemberg was further strengthened. In addition, the sale of INFRA Ingenieurgesellschaft to INFRA T. Salomon took place in June 2021, a strategic step toward clear repositioning.
New shareholders, expansion of management, transfer of IBV shares
Georg Heubach, Achim Schmielau, and Georg Thier joined the company as shareholders. Bernd Schulz was appointed managing director in January 2020. The shares in IBV Ingenieure GmbH were transferred to Christian Burgbacher on January 1, 2020.
Photo: Georg Thier, Georg Heubach, Achim Schmielau, Bernd Schulz (left to right)
Merger, management change, departure of shareholders, and sale of kosima shares
2019 was characterized by structural and personnel changes. On January 1, F.S. Ingenieure GmbH was merged into Ingenieurbüro Fritz Spieth Beratende Ingenieure GmbH and fully integrated. In April, Achim Schmielau and Georg Thier assumed the role of individually authorized managing directors. In December, Gerhard Heubach and Rainer Ludmann departed as shareholders; on December 31, Rainer Ludmann also ended his managing director activities. Also at year-end, the shares in kosima GmbH were sold to Ronny Biesinger.
Photo: Achim Schmielau and Georg Thier (left to right)
Expansion to North Rhine-Westphalia
With the founding of the Weilerswist office in 2016, Ingenieurbüro Fritz Spieth expanded its presence in North Rhine-Westphalia. The location was strengthened through the takeover of employees from the Ingenieurbüro Dipl.-Ing. Christoph Geißler in 2022.
Photo: Weilerswist office
Achim Schmielau & Georg Thier take over technical management
Achim Schmielau and Georg Thier assumed leadership of the technical division.
Founding of IBV Ingenieure GmbH
With the founding of IBV Ingenieure GmbH in Esslingen, the company specialized in demanding process engineering tasks.
Gerhard Heubach's departure from management and founding of kosima GmbH
Gerhard Heubach stepped down from management but continued to support the company's development as a shareholder. At the same time, kosima GmbH was founded, specifically expanding the service portfolio.
Photo: Gerhard Heubach
Founding of the Ludwigshafen office
Further expansion through the office in Ludwigshafen am Rhein.
Founding of the Heidelberg office
With the office in Heidelberg, Ingenieurbüro Fritz Spieth strengthened its presence in the Rhine-Neckar metropolitan region. The location enabled even closer support for municipalities as well as infrastructure and development projects in a high-growth region.
Investment in Re2area GmbH, Heidelberg
Through the investment in Re2area GmbH, Ingenieurbüro Fritz Spieth gained additional expertise in sustainable site development and revitalization of existing areas.
Bernd Schulz becomes shareholder and the office receives ISO 9001 certification
Bernd Schulz, Diplom-Ingenieur (FH) and with the company since 1993, became shareholder of Ingenieurbüro Fritz Spieth Beratende Ingenieure GmbH. At the same time, the company underscored its high quality standards with DIN EN ISO 9001 certification, establishing the foundation for continuous development of its processes and services.
Founding of F.S. Ingenieure GmbH, Ettlingen
Ingenieurbüro Fritz Spieth strengthened its network through the founding of F.S. Ingenieure GmbH in Ettlingen.
Complete takeover of the company by Gerhard Heubach & Rainer Ludmann
Gerhard Heubach and Rainer Ludmann took over the company completely.
Relocation to Esslingen-Zell
The company relocated to Fritz-Müller-Straße in Esslingen-Zell. The move marked another development step and created the spatial conditions to continue growth and modern work structures at the new location.
Photo: Esslingen-Zell location
Founding of INFRA Ingenieurgesellschaft, Dresden
Expansion through the founding of INFRA Ingenieurgesellschaft für Umwelttechnik und Infrastruktur mbH in Dresden.
Photo: Moving into the office
Handover of the company to Gerhard Heubach & Rainer Ludmann
Hans and Friedrich Spieth handed over the company to Gerhard Heubach and Rainer Ludmann, who were appointed as managing directors.
Conversion to a GmbH
The engineering office became Ingenieurbüro Fritz Spieth Beratende Ingenieure GmbH. Gerhard Heubach and Rainer Ludmann became shareholders.
Rainer Ludmann joins the company
With Rainer Ludmann, the company gained another technical expert.
Company size reaches 18 employees
The engineering office grew continuously and now employed 18 people.
Photo: Company outing to the Heilbronn-Boxberg pipeline
Gerhard Heubach joins the company
Gerhard Heubach joined the company and strengthened the team.
Photo: Gerhard Heubach
Handover to Friedrich and Hans Spieth
Following the founder's death, Friedrich and Hans Spieth took over the management of the engineering office.
Photo: Friedrich Spieth
Relocation to Esslingen-Berkheim
With the company's growth, the headquarters moved to Jakobstraße in Esslingen-Berkheim, establishing a base for the coming years.
Photo: Esslingen-Berkheim location
Founding of the Fritz Spieth Engineering Office
On April 1, 1955, Baurat Fritz Spieth founded the Fritz Spieth Engineering Office in Oberesslingen. The focus areas were wastewater technology, transportation, as well as water, gas, electricity, and fuel supply.
A promise to our children, grandchildren, and future generations
Quality & Environment
Sustainability through responsibility
For us, sustainability is more than an aspiration – it is the foundation of our actions. At Spieth Ingenieure, we combine environmental responsibility, economic viability, and social values into a holistic approach. This creates solutions that conserve resources, establish long-term perspectives, and provide sustainable value for people, the environment, and society.
We also take responsibility within our company: through an attractive work environment, modern working conditions, and a corporate culture based on trust, appreciation, and long-term thinking. With clear processes, open communication, and the commitment to continuously evolve, we shape the future responsibly and sustainably.
Quality Management
ISO 9001 certified since 2006
At Spieth Ingenieure, quality means meeting our clients' requirements according to specified criteria. This includes reliability and independence from supplier interests. To meet these standards, we have been working under transparent conditions according to DIN EN ISO 9001 since 2006.
Partnerships
Corporate investments & memberships
New perspectives for existing sites
Re2area GmbH stands for the revitalization and reintegration of previously used sites. Through intelligent reuse of brownfields, industrial areas, and conversion sites, sustainable, economically viable, and future-oriented development perspectives emerge for municipalities, investors, and property owners.
Digital infrastructure needs the right locations
DC Alliance GmbH develops and implements data center locations – from initial site analysis through zoning to infrastructure planning and marketing. For sustainable digital infrastructure with a future.
