EN 1090 – what does it actually mean?

Why is an EN 1090 standard important in steel building construction?

 

 

 

In the previous article, we explained where price differences in steel buildings come from.

 

One of the key factors that strongly influences the price — but is often not visible to the investor — is compliance with the EN 1090 standard.

 

But EN 1090 is not just a standard.

 

It defines how steel structures are manufactured, how quality is controlled, and — very importantly — the documentation that the investor receives at the end of the project.

 

 

What does CE marking mean for steel structures ?

 

 

 

If you come across the CE marking, it means that the product complies with European Union requirements.

In the case of steel structures, the CE marking is directly linked to EN 1090.

 

In practice, this means that:

 

  • the structure has been manufactured according to defined standards
  • the production process is controlled
  • the materials used have verified properties

 

This is not just a formality — it confirms that a structured quality system stands behind the product.

 

 

 

 

 

 

 

 

What requirements must the manufacturer meet?

 

 

EN 1090 is not a single document, but a set of rules that the manufacturer must implement and follow in daily production.

 

In practice, this includes:

 

  • controlled production processes
  • use of defined procedures (e.g. welding procedures)
  • qualified personnel
  • control of materials and their origin
  • proper documentation throughout the process

 

In short — production is not random.

 

Every step must be repeatable, controlled, and traceable.

 

 

 

 

 

 

 

 

 

 

EN 1090 and documentation – how does it connect?

 

 

In practice, EN 1090 does not end at production.

 

Its natural outcome is the documentation provided to the investor after completion of the building.

 

This is also where the biggest differences between suppliers often become visible.

 

 

What should the investor receive? 

 

 

After completion, the investor should receive documentation confirming that the structure has been manufactured in compliance with the required standards.

The most important elements include:

 

  1. CE marking and Declaration of Performance

 

Confirmation that the structure complies with EN 1090 and can be legally used.

 

  1. Material documentation

 

Information about the materials used, their properties, and origin.

 

This is important because steel quality directly affects the durability of the structure.

 

  1. As-built documentation

 

Confirmation that the structure has been completed in accordance with the design and applicable requirements.

 

In the case of prefabricated steel buildings, the as-built documentation is a natural continuation of the initial design — reflecting the same assumptions and solutions approved at the design stage.

 

This ensures that the final building corresponds to what was originally agreed.

 

 

Why does EN 1090 matter for the investor?

 

From an investor’s perspective, the key question is:

 

  • is the structure safe and compliant with regulations?

 

And this is exactly what EN 1090 ensures — especially when combined with complete documentation.

 

Thanks to this standard:

 

  • the structure meets legal requirements
  • the production process is controlled and systematic
  • the risk of issues during handover is reduced
  • the investor has greater confidence in the quality of execution

 

These are things that are not always visible at first glance — but they are crucial in practice.

 

 

 

What if the structure does not comply with EN 1090?

 

 

This is a topic that is rarely discussed openly.

 

Non-compliance with the standard may result in:

 

  • problems during building handover or inspection
  • missing required documentation
  • the need for additional assessments or expert reports
  • project delays

 

In extreme cases, the structure may not be eligible for use without further corrective actions.

 

EN 1090 is not an “extra” or unnecessary formality.

 

It is the foundation that defines whether a steel structure has been manufactured in a safe, repeatable, and compliant way.

 

Combined with proper documentation, it gives the investor a clear picture of the quality and responsibility of the manufacturer.

 

That is why, when choosing a supplier, it is not only the price that matters — but also whether the offer is backed by a real quality system supported by documentation.

 

 

 

 

 

 

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