Quality & Certification

We guarantee professional work — in black and white

For us, quality is not a promise, but a demonstrable standard.
Our employees are well trained, continue to develop their skills and work safely and professionally, both in the workshop and on site.

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Certification & conditions

De Graaf Metaalwerken guarantees neat delivery and offers clear guarantees on assembly work.
We work in accordance with recognised standards and have the necessary certifications, including:

VCA engineers

The work carried out by our certified engineers and contractors on site is done safely, healthily and with respect for the environment.

CE marking

As we are certified according to the NEN-EN 1090-1 EXC class 2 standard, we are authorised to issue the CE certificate for the load-bearing steel structures we supply.

International Welding Technologist

As a certified welding engineer, we comply with various national and international standards, which means we work responsibly in all matters relating to welding technology.

Metaalunie terms and conditions

The Metaalunie terms and conditions apply to our quotations and to the agreements concluded with us.

Qualicoat

Qualicoat is a global quality label that guarantees the quality of lacquer, paint and coating applications on aluminium.

Standards and conformity

Depending on your product/project requirements, De Graaf Metaalwerken can comply with the standards listed below, among others.

NEN-EN 1090-1 EXC class 2

Execution of steel structures and aluminium structures

NEN-EN-ISO 1461

Hot dip galvanized coatings on fabricated iron and steel articles

NEN-EN-ISO 3834-1

Quality requirements for fusion welding of metallic materials

Sustainable craftsmanship

For people and the planet

We take our responsibility for people and the environment seriously. For every project, we consider the impact on raw material use, waste and energy. Our sustainable working methods include:

Reuse of materials (such as steel, stainless steel and aluminium)
Efficient production with minimal waste
Selection of sustainable coatings and finishes
Use of green energy in our workshop
Waste separation & recycling

We also contribute ideas for circular solutions, for example in collaboration with designers or customers who want to build modularly. What we make must not only be good now — it must also be reusable or adaptable in the future.

Together at the heart of society

Technology with a heart

As a family business, we are at the heart of society. We invest in young professionals, collaborate with local initiatives and support social projects. For example, we help with:

Our code of conduct is clear: we work honestly, with respect for people, nature and the environment. Together, we not only build steel structures — we also build trust, continuity and connection.