CIVIL ENGINEERING · TRACK CONSTRUCTION · INFRASTRUCTURE

Building the infrastructure of tomorrow.

Since 1961, we have been delivering track construction, civil engineering and infrastructure projects across Germany and Switzerland – as a certified partner of Deutsche Bahn, energy providers and municipalities. With more than 200 employees, our own machinery fleet and in-house material supply, we provide a single point of contact across all trades.

Mitarbeiter der Klefenz GmbH vor einer Baumaschine auf dem Betriebsgelände.
CIVIL ENGINEERING · RAILWAY CONSTRUCTION · INFRASTRUCTURE

WE’RE BUILDING TOMORROW’S INFRASTRUCTURE.

Mitarbeiter der Klefenz GmbH in oranger Warnkleidung bei Tiefbauarbeiten an einem Bahngleis der Hochrheinbahn
RAILWAY CONSTRUCTION · UPPER RHINE LINE · FLAGSHIP PROJECT

WE’RE GETTING THE UPPER RHINE RAILWAY BACK ON TRACK.

Bauarbeiter in orangefarbener Schutzkleidung bedient ein Bohrgerät auf einer Baustelle
KLEFENZ · GROUP OF COMPANIES

STRONGER TOGETHER: KLEFENZ ACQUIRES FRETUS.

Mitarbeiter in Klefenz Weste auf der Baustelle im Einsatz.
CAREERS · APPRENTICESHIPS · CAREER CHANGES

BUILD YOUR FUTURE. AT KLEFENZ.

Nachtszene mit mehreren Arbeitern in orangenen Schutzanzügen, die Gleisbauarbeiten mit schwerem Gelbbaumaschinen an einer Eisenbahnstrecke durchführen.
BUILDING THE REGION’S INFRASTRUCTURE FOR 65 YEARS.

WE’RE BUILDING TODAY WHAT WILL SUPPORT FUTURE GENERATIONS.

Klefenz

Three generations. One signature.

Unser Imagefilm.

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Since 1961, a family-owned company based in the High Rhine region, with more than 200 employees and a clear standard: building solidly, thinking long term.

Our Services.

From track construction and cable construction to civil engineering, road construction and fibre-optic expansion – Klefenz covers all trades required for modern infrastructure projects. With our own personnel, our own machinery fleet, our own gravel pit and our own recycling yard, we reduce interfaces, save time and coordination effort, and ensure quality at every level.

BECOME PART OF KLEFENZ

Build Your Career with Klefenz.

At Klefenz, you work for a family-owned company that has been growing in the High Rhine region since 1961 – with more than 200 colleagues, a modern machinery fleet and projects you can still point to in 30 years’ time. From track construction for Deutsche Bahn to fibre-optic expansion for your local community.

We offer fair pay, secure jobs and real development opportunities – from apprentice to foreman, from machine operator to site manager. What matters to us is craftsmanship, reliability and the willingness to take responsibility.

Mitarbeiter in Klefenz Kleidung auf der Baustelle im Einsatz.

65+

Years of tradition

200+

Employees
PROVEN IN PRACTICE

Completed Projects.

BEHIND THE SCENES

News from Klefenz.

Zwei Mitarbeiter der Klefenz GmbH im Planungsgespräch mit Bauunterlagen im Büro.
KLEFENZ NEWS

Acquisition of FRETUS AG. 

Bauarbeiter in Warnweste auf Baustelle von hinten fotografiert
About our blog

Insights, not press releases.

Here, we share what is happening at Klefenz: projects we are currently working on, people who have been part of our team for years or only for a few weeks, and investments and developments within the company. No polished success stories – just concrete reports from everyday work.

Let's Build Something Together.

Whether it is a demanding construction project or a professional perspective – Klefenz stands for experience, reliable collaboration and a clear commitment to quality. If you would like to realise a project or become part of our company, we look forward to speaking with you and taking the next step together.

Mitarbeiter in Klefenz Kleidung auf der Baustelle im Einsatz.
Mitarbeiter der Klefenz GmbH vor einer Baumaschine auf dem Betriebsgelände.
Zwei Männer vorne zeigen Daumen hoch, im Hintergrund steht eine Gruppe von Bauarbeitern in orangefarbener Arbeitskleidung.
About Us
A family-run business since 1961 – today with over 200 employees serving Deutsche Bahn, municipalities and energy providers.
Bauarbeiter in Warnweste auf Baustelle von hinten fotografiert
Services
Eleven trades under one roof – with our own personnel, our own machinery fleet and our own material supply in the High Rhine region.
Zwei Mitarbeiter der Klefenz GmbH im Planungsgespräch mit Bauunterlagen im Büro.
Prequalifications
DB-certified partner, ECM in accordance with EU Regulation 2019/779 – qualifications that count in every tender.