What Donges SteelTec does

Donges SteelTec GmbH is a privately held German steel construction company headquartered in Darmstadt, founded in 1872 and operating as part of the Donges Group. With approximately 200 employees, the firm delivers integrated planning, fabrication, and assembly services for complex steel structures, organized into two divisions: Bridge Construction (Brückenbau) — covering road, railway, pedestrian/cyclist, and waterway bridges — and Building Construction (Hochbau) — covering railway stations, airports, sports facilities, parking garages, industrial halls, logistics halls, façades, and power plants. Technical capabilities include Tekla-based 3D/2D workshop drawing and piece-list creation, multiple welding procedures, in-house corrosion protection, and precision heavy-lift assembly operations such as SPMT (Self-Propelled Modular Transporter) moves, incremental launching, and floating-in installations. The company also operates an annual Donges Förderpreis (€6,000 prize) for student theses in steel construction as part of its talent pipeline.

The firm generates revenue through project-based contracts acquired via competitive public-sector tendering and direct negotiations with infrastructure clients, primarily operating as a general contractor or through ARGE (Arbeitsgemeinschaft) joint ventures with complementary construction partners. Pricing is determined per project and is not publicly disclosed. Customer mix is dominated by German public-sector infrastructure buyers — including Deutsche Bahn, the Berlin Senate, and municipal authorities across Hesse, Berlin, Rhineland-Palatinate, North Rhine-Westphalia, Bavaria, and Lower Saxony — supplemented by industrial clients (Salzgitter Flachstahl) and commercial/sports operators (SV Darmstadt 98). Reference projects include the ~1,500-tonne Elsenbrücke Berlin, the ~3,000+ tonne Pfaffendorfer Rheinbrücke Koblenz, the ~3,500-tonne Voestbrücke Linz (Austria), and the Ariane 6 service tower assembly. The 2021 Deutscher Architekturpreis for a pedestrian/cyclist bridge in Darmstadt and the recently completed Kalzip acquisition round out a profile positioned as one of Germany's leading specialist steel construction firms.

Name

Donges SteelTec

Legal name

Donges SteelTec GmbH

Website

https://donges-steeltec.de

Company type

Private

Founded year

1872

Operating status

Operating

Headcount range

11–50 employees

Short description

Donges SteelTec GmbH is a privately held German steel construction firm in Darmstadt (~200 employees, part of Donges Group) delivering planning, fabrication, and assembly of complex bridges and steel buildings for public-sector infrastructure clients and industrial customers.

Ownership category

akta.pro rank

Product category

Structural Steel Construction

NAICS

Fabricated Structural Metal Manufacturing (332312), Architectural and Structural Metals Manufacturing (3323)

SIC

Fabricated Structural Metal Products (3440)

akta.pro primary industry

Bridge & Infrastructure Steel Components (IMADACAL)

akta.pro secondary industries

Metals & Steel Mill Facility Construction (IMAFADAF), Steel Joists, Joist Girders & Decking (IMADACAC)

Keywords

• Steel bridge construction
• Structural steel engineering
• Industrial steel fabrication
• Bridge assembly services
• Steel building construction

Headquarters

HQ city

Darmstadt

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Steel Construction Projects: Donges SteelTec generates revenue through planning, manufacturing, and assembling steel structures for infrastructure and building projects. Revenue is project-based, typically involving long sales cycles with public and private sector clients. Projects include bridges, railway stations, airports, sports facilities, industrial halls, and power plants. The company operates as general contractor or as part of joint ventures (ARGE).

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Donges SteelTec specializes in the planning, fabrication, and on-site assembly of complex steel bridge and structural steel building projects. The company operates two main service divisions—Bridge Construction (Brückenbau) covering road, railway, pedestrian/cyclist, waterway, and viaduct bridges, and Building Construction (Hochbau) covering railway stations, airports, sports facilities, parking garages, industrial halls, logistics halls, facades, and power plants. End-to-end services span project management, design/planning, in-house manufacturing using CAD/3D systems (Tekla or comparable), corrosion protection, and on-site assembly including complex heavy-lift methods such as SPMT, incremental launching, and floating-in installation.

Product overview

Donges SteelTec is a steel construction company operating in Germany and internationally with approximately 200 employees. The company offers a unified portfolio of planning, fabrication, and assembly services for steel structures, organized into two main divisions: Bridge Construction (Brückenbau) covering road bridges, railway bridges, pedestrian/bike bridges, waterway bridges, and viaducts; and Building Construction (Hochbau) encompassing railway stations, airports, sports facilities, parking garages, industrial halls, logistics halls, facades, and power plants. The services encompass the full project lifecycle from project management and planning through fabrication in their Darmstadt production facility to on-site assembly. The company is part of the Donges Group and is recognized as one of Germany's leading steel construction companies, with reference projects including major bridges like the Pfaffendorfer Rheinbrücke and Elsenbrücke Berlin, as well as industrial and sports facilities. They also operate a community engagement program through the Donges-Förderpreis award for academic excellence in steel construction.

Differentiator

Problem solved

Functional benefit

Products and services

• Bridge Construction (Brückenbau) Planning, fabrication, and assembly of various bridge types including road bridges, railway bridges, pedestrian/bicycle bridges, waterway bridges, and viaducts. The service covers specialized assembly methods (longitudinal pushes, SPMT transport, floating-in operations), corrosion protection, and engineering of complex steel bridge constructions for public infrastructure clients.
• Building Construction (Hochbau) Construction of steel buildings including railway stations, airports, sports facilities, parking garages, industrial halls, logistics halls, industrial facades, and power plants. Includes complete structural and building envelope solutions with custom design for diverse commercial, industrial, and public-sector uses.
• Steel Construction Services Comprehensive project services for steel construction spanning project management, planning/design, fabrication in production facilities, and on-site assembly. The service supports the full steel structure lifecycle from concept through completion and includes CAD-based 3D/2D design, piece lists, workshop drawings, various welding procedures, corrosion protection, and quality documentation.

Quantifiable outcome

• Successful installation of complex bridge structures using precision SPMT and floating-in methods under challenging conditions
• +1 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Two partnerships are on record, tiered core.

• ARGE Donges SteelTec / Albert WeilcoreStrategic or Co-development Partner · 1 March 2026Joint venture for the Bad Camberg railway overpass project. The Stabbogenbrücke (arch bridge) was successfully installed in March 2026 as part of the Bad Camberg–Erbach–Würges bypass route. Donges SteelTec manufactured and assembled the 800-tonne steel structure.
• ARGE Donges SteelTec / Eurovia / VIA StructurecoreStrategic or Co-development Partner · 1 November 2025Joint venture (ARGE) for the Elsenbrücke Berlin project. Donges SteelTec serves as the responsible partner for steel construction, assembly, and corrosion protection, as well as assembly planning for complex longitudinal pushes and the floating-in operation. Eurovia and VIA Structure serve as complementary construction partners for this significant Berlin infrastructure project. The 155m bridge connects Friedrichshain and Treptow districts.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Cimolai: Italian steel engineering and construction group executing large bridges, stadium roofs, and industrial structures across Europe. Comparable in heavy steel fabrication scale and complex project execution profile.
• MCE GmbH: German heavy steel engineering firm executing bridge and industrial projects, including SPMT and incremental launching assembly work. Directly comparable in technical approach and target customer base.
• Eiffel Deutschland Stahltechnologie: German structural steel contractor operating in the bridge and industrial construction space, part of the broader Eiffel group. Directly comparable in project profile, customer base (public infrastructure), and scale (~hundreds of employees).
• Max Bögl: Large German construction group with substantial in-house steel bridge and structural steel fabrication capabilities, executing comparable infrastructure projects for Deutsche Bahn and federal clients. Significantly larger than Donges SteelTec and a frequent prime-contractor competitor.
• Victor Buyck Steel Construction: Belgian heavy steel constructor specializing in bridges, industrial buildings, and signature structures. Comparable in technical complexity and international project footprint, often competing for the same DACH/Benelux bridge tenders.
• Waagner-Biro Stage Systems: Austrian-headquartered specialist in complex steel structures including bridges, stage engineering, and infrastructure. Closely comparable in technical specialization for heavy steel assembly and complex project execution in the DACH region.
• Plauen Stahl Technik: German steel construction firm focused on bridge and structural steel projects, with comparable scope in road and rail bridge fabrication. A direct competitor for German public infrastructure tenders.

Others

• Sarens: Belgian heavy lifting and engineered transport specialist executing SPMT operations and heavy bridge assembly globally. Adjacent ecosystem participant — often a subcontractor to steel constructors like Donges on complex bridge moves rather than a direct competitor.

Regional players

• Bemo Systems (Tata Steel): Standing-seam roofing and facade systems provider, part of Tata Steel, operating across European markets. Comparable to Donges' Kalzip business unit (also acquired for building envelope) — adjacent rather than directly competing in primary bridge work.

Emerging players

• SCHACHTBAU NORDHAUSEN / Schäfer Werke: German metal construction group with steel bridge and structural steel capabilities serving industrial and infrastructure clients. Adjacent competitor with overlap in medium-complexity steel construction projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/Donges-SteelTec-Gmbh-514074661941673
• LinkedInlinkedin.com/company/donges-steeltec

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Donges SteelTec