As an industrial engineer and seasoned manager with international experience in engineering, plant construction, and technical services, Thomas Brandstätt brings extensive expertise in strategy and finance to the KONZMANN Group. Recently, he served as managing director and later as chairman of the executive board at Tractebel Engineering GmbH (formerly Lahmeyer International). There, he played a key role in the strategic realignment and transformation of the energy business. Previously, he held various leadership positions in the Technical Services division at HOCHTIEF and in plant engineering at Bilfinger.

Together with Oliver Rennig, CEO of the KONZMANN Group, Thomas Brandstätt forms the new dual leadership of the executive board. In his role as CFO, he will be responsible for finance, controlling, and IT.

With the expansion of the executive board, leadership responsibilities will now be shared by two experienced executives. Oliver Rennig remains Chairman of the Executive Board and continues to be responsible for the strategic and operational management of the Group. As CFO, Thomas Brandstätt will serve as a strong sparring partner and play a key role in shaping financial management and the further development of the KONZMANN Group.

“I am very pleased to welcome Thomas Brandstätt as a new member of our leadership team,” says Oliver Rennig. “His experience and expertise will help us continue the KONZMANN Group’s successful growth trajectory.”

Thomas Brandstätt adds: “I am proud to now be part of this high-performing group of companies and look forward to writing the next chapters of our success together with the management team and all employees. The KONZMANN Group has grown significantly recently. With my experience, I would like to contribute to further driving this growth, both organically and inorganically.”

Frank Wolf previously held the position of CFO as a member of the executive management team. The KONZMANN Group thanks Frank Wolf for his consistently excellent and trusting collaboration, as well as for his valuable professional expertise and dedicated commitment over the past years. His contribution to the recently successfully completed change of ownership deserves special mention. “On behalf of the shareholders and all employees, I would like to express my sincere thanks to Frank Wolf for his work and dedication,” said Oliver Rennig.

With its new dual leadership structure, the KONZMANN Group is ideally positioned to expand its growth successfully, stability, and long-term value creation for its customers, employees, and shareholders.

The KONZMANN Group continues to grow and strengthen its expertise in refrigeration and air conditioning technology: With the long-established brand Herber & Petzel Gebäudetechnik GmbH & Co. KG from Münster, the group is acquiring a family-owned business with over 125 years of experience and 55 specialists in refrigeration, air conditioning, ventilation, and electrical engineering. Herber & Petzel stands for craftsmanship, technical excellence, and a strong regional connection — values that align perfectly with the KONZMANN Group’s philosophy.

“With Herber & Petzel, we are gaining a family-owned business that has stood for the highest level of technical expertise, deep regional roots, and a commitment to entrepreneurship for four generations,” explains Oliver Rennig, CEO of the KONZMANN Group. “We are very pleased to welcome our colleagues to the KONZMANN family. This merger is another important step on our journey to consolidate our position as a comprehensive service provider for modern and sustainable solutions in energy and building technology responsibly and with an eye toward the future.”

A particular focus is placed on comprehensive coverage of cost group 400, which encompasses all technical systems installed or permanently integrated into the building, from plumbing to building automation. Since these systems account for a significant portion of the total investment and have a major impact on future operating costs, their careful planning is a key factor for success.

IBB GmbH’s goal is to act as a general technical planner to minimize interfaces with the client. Upon request, IBB GmbH also assumes the role of general planner, particularly in industrial projects where technical procurement costs exceed construction costs.

“With IBB, we are gaining an excellently positioned engineering firm with deep technical expertise and a clear strategy. The four locations significantly expand our presence in Bavaria while also bringing us closer to our customers,” explains Oliver Rennig, CEO of the KONZMANN Group. “The merger is another milestone on our path to becoming a 360° energy and building services provider, from consulting and planning through execution to service and technical operations.”

In recent years, the KONZMANN Group has continued to evolve. Strategic acquisitions, the ongoing optimization of existing business processes, and a corporate culture firmly established from the very beginning form the foundation of this success story. Despite its size, the group continues to be characterized by independently operating, regionally rooted subsidiaries that preserve their individual historical identities and market presence. This concept has proven to be extremely successful. In the 2024 fiscal year, the group achieved total revenue of approximately 180 million euros.

With approximately 1,100 employees across 21 companies, the KONZMANN Group today offers a comprehensive 360° portfolio of services: ranging from core building services engineering competencies such as heating, air conditioning, ventilation, and plumbing to refrigeration and electrical engineering, and building automation. The offering is complemented by consulting, planning, and design services, as well as comprehensive maintenance and repair services. In this way, the group supports private, commercial, and public customers alike on their path toward an energy-efficient, environmentally friendly, and economically sustainable future.