Klefenz is certified – in every sense.

Railway infrastructure, energy supply and major municipal projects follow clear rules. Anyone wishing to carry out work in these sectors must be certified, prequalified and pass regular audits. Klefenz has met these requirements for decades – not as an add-on, but as a prerequisite for every tender in which we participate.

deutsche bahn logo (DB)
proof of prequalification

Cable Routing Systems

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deutsche bahn logo (DB)
proof of prequalification

Cable Laying

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deutsche bahn logo (DB)
proof of prequalification

Construction Services

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deutsche bahn logo (DB)
proof of prequalification

Track Superstructure

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deutsche bahn logo (DB)
proof of prequalification

Signalling Technology

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DVGW 301 Logo
certification

DVGW 301

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DVGW 381 Logo
certification

DVGW 381

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EcoVadis Logo
certification

Ecovadis

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Marvin Klefenz
Managing Director

Awards are not a goal for us, but confirmation that reliability, quality and consistent work are being noticed.

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.
Team der Klefenz GmbH auf einer Baustelle mit Arbeitskleidung und Kabeltrommel im Hintergrund.
More about us
A family-owned company since 1961, grown in the High Rhine region – who is behind the certificates and how we work.
Mitarbeiter bearbeitet Stahlrohre für den Rohrleitungsbau auf einer Baustelle.
References
From sleeper replacement during live rail operations to Digital Rail – selected projects from our portfolio.
Mitarbeiter der Klefenz GmbH vor einer Baumaschine auf dem Betriebsgelände.
Services
Eleven trades under one roof – from track construction and civil engineering to cable construction and fibre-optic expansion.