About Sejerslev
Sejerslev combines in-house steel production with mobile specialists in welding and installation. We solve technically demanding tasks within infrastructure, specialist foundations, utilities and industry, where quality, flexibility and documentation are decisive.
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Specialists rather than standard solutions.
We take our starting point in the specific task. Some projects require technical clarification and detailed engineering; others place special demands on materials, welding methods, production, documentation or installation.
What they share is the need for a partner who can turn complex requirements into a solution that can be produced, inspected and executed in practice.
Sejerslev has received the Børsen Gazelle award for seven consecutive years, from 2020 to 2026.
Recognised growth. Year after year.
Sejerslev has received the Børsen Gazelle award over several years, recognising the company’s sustained growth and development.







Close to the project. All the way.
Technical understanding
We engage with the project’s requirements and details early, so that the solution is consistent with the planned production, installation and documentation.
In-house production
Workshop and project organisation work closely together, so technical clarifications can quickly be turned into production and practical execution.
Documentation
Quality, welding coordination and traceability are planned from the beginning and adapted to the requirements of the project.
Flexibility
Short decision-making paths and our own production resources make it possible to react quickly to changes. Delivery time and mobilisation are agreed according to the specific task.
Built for reality.
A steel delivery does not only exist on a drawing. It must be possible to produce, transport and install it - and it must function under the actual conditions on the construction site.
That is why we think all the way from technical clarification to documented execution and take responsibility for the interfaces between the individual phases.

The experience lies in the projects.

E45 - Project 6070.204
In close technical dialogue with the consultant, Sejerslev contributed to the re-engineering of approx. 140 tonnes of steel structure, so that the solution accounted for the actual tolerances of the sheet piling.
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Skive Fjordbad
Complete steel superstructure delivered end-to-end - from 3D modelling and detailed engineering to in-house production, trial assembly, documentation and installation. More than 60 tonnes of steel in accordance with DS/EN 1090-2 in EXC2.
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Banedanmark - Track lowering, Vesterbro, Aalborg
Approx. 200 sheet piles extended and welded together in EXC3 acc. to DS/EN 1090-2 under Banedanmark’s inspection regime - directly adjacent to active railway infrastructure.
Read the caseWe must understand the task before we build the solution.
This creates a better basis for technical decisions, a realistic schedule, safe production and documented execution - and for a collaboration where decisions can be made close to the task.
Do you have a steel task we should look at?
Contact us early in the process, so we can have a concrete dialogue about the project, the requirements and the right way forward.
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