EN 1090-1: A comprehensive guide to conformity, CE marking and factory production control for structural steel and aluminium
EN 1090-1 stands at the centre of modern fabrication for structural steel and aluminium components. This article unpacks the essentials of EN 1090-1, explaining what it requires, how it fits with EN 1090-2 and EN 1090-3, and what fabricators and engineers need to do to stay compliant. By demystifying the process, we’ll help you implement the standard effectively, reduce risk, and keep projects on time and on budget.
EN 1090-1: Scope, significance and the fundamentals
What is EN 1090-1?
EN 1090-1, the general part of the European standard for structural components, sets out the requirements for conformity assessment and factory production control (FPC) for steel and aluminium structures. It is the gatekeeper for CE marking under the Construction Products Regulation (CPR), ensuring products meet essential safety and performance characteristics before they can be marketed within the European Economic Area. In practice, EN 1090-1 defines how an organisation should structure its quality management, document its processes, and demonstrate ongoing control over fabrication activities.
Why EN 1090-1 matters for fabrication and construction
For fabricators, EN 1090-1 provides the framework that enables CE marking of steel and aluminium structural elements. Clients, designers, and main contractors increasingly specify EN 1090-1 compliance to guarantee that components meet performance and safety expectations. The standard also helps standardise quality across suppliers, reducing the risk of non-conforming work and costly rework on site. In short, EN 1090-1 translates design intent into reliable, reproducible manufacturing outcomes.
Scope and boundaries of EN 1090-1
The scope of EN 1090-1 covers organisations that perform structural fabrication and assembly work, including those that undertake welding, cutting, drilling, bolting, painting, and related on-site activities. It does not replace the structural design codes themselves; rather, it complements them by prescribing how production and inspection should be organised and evidenced. Importantly, EN 1090-1 is the prerequisite for CE marking; EN 1090-2 (technical requirements for steel structures) and EN 1090-3 (aluminium structures) define the technical performance criteria behind those products.
Key requirements of EN 1090-1 you should know
Factory Production Control (FPC): the heartbeat of EN 1090-1
FPC is the cornerstone of EN 1090-1 conformity. It requires a documented quality management approach that governs the production process from raw materials through fabrication to finished components. An FPC system must describe the organisation, responsibilities, manufacturing controls, traceability, inspection, testing, decision rules for non-conformities, and corrective actions. In practical terms, this means clear procedures, defined authorities, and a robust audit trail that demonstrates continual control over production.
Documentation, records and traceability
Under EN 1090-1, traceability is a legal and operational expectation. You must be able to trace raw materials, welding consumables, and fabrication steps back to their origin. Documentation typically includes quality manuals, welding procedures, material certificates, inspection plans, non-conformance reports, calibration certificates, and records of personnel competence. The aim is full visibility, so that any issue can be traced to its source and resolved quickly.
Personnel competence and responsibility
People are central to EN 1090-1 compliance. The standard requires that personnel who perform critical activities—such as welding, inspection, and assembly—are competent and appropriately certified or trained. Documented evidence of training and qualification is essential, along with defined responsibilities for quality assurance, calibration, and non-conformance management.
Equipment, calibration and measurement systems
Equipment used in fabrication and inspection must be calibrated and maintained. This includes welding machines, cutting equipment, measurement devices, and non-destructive testing tools. Calibration certificates, maintenance records and periodical checks should be readily available as part of the FPC documentation. In EN 1090-1 terms, measurement accuracy and equipment reliability underpin safe, consistent fabrication outcomes.
Notified Bodies, conformity assessment and CE marking
To obtain CE marking under EN 1090-1, an organisation typically engages with a Notified Body for conformity assessment of the FPC system and related documentation. The Notified Body evaluates whether the organisation’s FPC meets the requirements of EN 1090-1, then issues a certificate of conformity. With this certificate, the manufacturer can affix the CE mark to produced components, demonstrating compliance with CPR and the relevant EN standards.
Declaration of Performance (DoP) and CPR responsibilities
As part of the CPR obligations, structural products may be accompanied by a Declaration of Performance (DoP) that communicates essential performance characteristics to the market. EN 1090-1 helps underpin DoP accuracy by ensuring manufacturing control and traceability. The DoP is a formal communication from the manufacturer to the customer and authorities, confirming that the product meets the stated performance characteristics.
Execution classes and their connection to EN 1090-1
EXC classes explained
Throughout EN 1090-1 and its related parts, execution classes (EXC) define the level of fabrication and on-site performance required for a given product. EXC1 to EXC4 reflect increasing complexity, criticality, and risk associated with structural performance. The selection of an execution class informs the levels of control, inspection, and personnel competence that must be implemented in manufacturing and assembly processes.
How EXC determines manufacturing controls
Selecting the appropriate EXC drives your FPC design: higher EXC levels require more stringent documentation, more comprehensive in-process inspection, more rigorous welding procedure specifications, and tighter material traceability. EN 1090-1 does not specify exact tests for each EXC level; it requires you to implement controls that match the risk profile of the structure and demonstrate those controls through your FPC documentation and conformity assessments.
Working with EN 1090-2 and EN 1090-3: The triad of EN 1090
EN 1090-2 vs EN 1090-1: where the technical requirements live
EN 1090-2 provides the technical requirements for steel structures, detailing the structural design criteria, welding, bolting, and structural assembly specifics. EN 1090-1 covers conformity assessment and FPC, while EN 1090-2 focuses on the manufacturing and performance criteria themselves. Together, they form a complete framework for the production and marking of steel structural components.
EN 1090-3 and aluminium structures
For aluminium structures, EN 1090-3 sets out the technical requirements relating to aluminium fabrication, including welding and mechanical joining. As with EN 1090-2 for steel, EN 1090-3 works in concert with EN 1090-1 to ensure conformity and consistent quality in aluminium fabrication projects.
Practical implementation: a practical pathway to EN 1090-1 compliance
Step 1 — conducting a gap analysis
Begin with a gap analysis to identify what existing processes meet EN 1090-1 and where weaknesses lie. Review your quality management system, tracer documentation, welding procedures, personnel qualifications, calibration schedules, and existing supplier controls. The gap analysis informs the scope of the FPC manual and the level of Notified Body involvement.
Step 2 — building a robust FPC framework
Develop a comprehensive Factory Production Control framework that documents all critical processes. This should include a quality manual, process maps, inspection and testing plans, non-conformance handling, calibration records, and a clear chain of responsibility. The FPC framework is the backbone of EN 1090-1 compliance and must be visible, accessible, and maintained.
Step 3 — competence and training programmes
Establish formal training and certification pathways for welders, inspectors, and operators. Track qualifications and refreshers, ensuring records align with the execution class you target. Training should align with industry best practise and, where relevant, reflect the requirements of EN 15085 for welding or ISO 9712 for non-destructive testing.
Step 4 — documentation, materials and traceability
Put in place rigorous traceability from raw material to finished component. Maintain material certificates, welding consumable specifications, and procedure approvals. Ensure that all serial numbers, batch records, and heat numbers are captured in your manufacturing records.
Step 5 — engaging with a Notified Body
Choose a Notified Body with experience in EN 1090-1 and the appropriate EN 1090-2 or EN 1090-3 scopes. Prepare your quality manual, FPC documentation, and examples of compliance evidence. The Notified Body will undertake an assessment, often including documentation review and on-site audits, before issuing a certificate.
Step 6 — achieving CE marking and DoP readiness
Upon successful assessment, you receive a certificate of conformity enabling CE marking on eligible products. Compile your DoP for market-facing obligations, ensuring it accurately reflects performance characteristics and corresponding EN 1090-1 compliance. Maintain the DoP alongside your product documentation as long as the products are sold or used in construction projects.
Step 7 — ongoing surveillance and renewal
EN 1090-1 compliance is not a one-off milestone. Expect ongoing surveillance by the Notified Body and regular internal audits. Keep your documentation up to date, review certification scopes if you change processes or EXC levels, and re-attest when required.
UK considerations post-Brexit: keeping EN 1090-1 in view
CE marking vs UKCA and construction products
Since Brexit, the UK has implemented its own marking system for construction products. While the CE mark remains widely recognised for many projects, the UK introduced the UK Conformity Assessed (UKCA) mark for goods placed on the UK market. The status of EN 1090-1 conformity in the UK depends on adoption of UKCA or continued mutual recognition, and some projects may still rely on CE marking depending on the contract and customer requirements. It is essential to stay informed on current regulations and ensure your FPC documentation can support whichever marking regime your customers expect.
Staying compliant in a changing landscape
Even with Brexit, many of the technical aspects of EN 1090-1 remain relevant for good manufacturing practice. If you supply to EU member states or to markets that require ongoing CE marking, maintain readiness for CE-based conformity assessments. For UK-only projects, ensure you understand UK conformity routes and how your EN 1090-1 FPC integrates with UK standards and audit regimes.
Common dilemmas, challenges and how to resolve them
Balancing cost and compliance
EN 1090-1 compliance can be resource-intensive, particularly for small shops. Start with a pragmatic scope, focusing on critical components and higher EXC levels first. Leverage existing quality processes where possible, and plan a staged approach to implement additional controls as projects scale.
Keeping records accessible and durable
Document management is often the Achilles’ heel. Establish a central electronic repository with clear naming conventions, version control, and access rights. Regularly back up data and implement a transparent audit trail so that inspectors can retrace every decision from raw materials to finished components.
Ensuring continuous competence
Competence is not a one-time event. Set a programme of ongoing training, track refresher courses, and validate practical performance through periodic on-site assessments. For welding and non-destructive testing, consider external certification schemes to bolster credibility with Notified Bodies and clients.
Documentation and practical tips for successful EN 1090-1 compliance
Documentation you should maintain
- Quality manual and FPC procedures
- Material certificates and welding procedure specifications
- Calibration certificates and equipment maintenance logs
- Welding records, inspection reports, and non-conformance notes
- Personnel qualification records and competency matrices
- Traceability records linking components to materials and processes
Welding and fabrication: practical considerations
Welding quality under EN 1090-1 is assessed through procedures and controlled in-process checks. Ensure welding procedures are approved, welding operators are qualified, and inspection regimes capture weld quality at critical points in the fabrication process. In steel structures, the selection of filler materials and welding technique should align with the design and EXC level.
Choosing the right Notified Body
When selecting a Notified Body, consider their experience with EN 1090-1 and their familiarity with your sector (e.g., bridges, building frames, industrial structures). Clarify their audit cycle, fee structure, and the timeline for certification. A good Notified Body partner will guide you through gaps and provide practical advice for achieving and maintaining compliance.
Frequently asked questions about EN 1090-1
Is EN 1090-1 required for all structural fabrications?
EN 1090-1 is required for products that are intended to bear structural loads and fall within CPR scope in the EU and many other markets. If a project requires CE marking for structural components, EN 1090-1 is typically the starting point for conformity assessment.
Do I need EN 1090-2 or EN 1090-3 to comply with EN 1090-1?
No. EN 1090-2 and EN 1090-3 define the technical requirements for steel and aluminium structures, respectively. EN 1090-1 covers conformity assessment and FPC. For fabrication, you often need EN 1090-2 or EN 1090-3 in conjunction with EN 1090-1.
What is the role of the Declaration of Performance in EN 1090-1?
The DoP communicates essential performance characteristics of construction products under CPR. EN 1090-1 supports DoP by ensuring that the production process and quality controls reliably produce components that meet stated performance levels.
How long does EN 1090-1 certification typically take?
Timescales vary by organisation size, complexity, and the Notified Body’s schedule. A typical timeline from initial assessment to certification can range from a few months to several months, depending on readiness, documentation quality, and the scope of the EXC levels involved.
Conclusion: mastering EN 1090-1 for safer, compliant fabrication
EN 1090-1 is more than a regulatory hurdle; it’s a robust framework for consistent, high-quality fabrication. By implementing a well-structured Factory Production Control system, maintaining rigorous documentation, and ensuring personnel competence, fabricators can deliver reliable steel and aluminium components that meet safety and performance expectations. Understanding the relationship with EN 1090-2 and EN 1090-3, planning for ongoing surveillance, and staying mindful of UK considerations will help organisations navigate the evolving landscape with confidence. With the right preparations, compliance becomes a competitive advantage, not a burden, and your EN 1090-1 journey can lead to smoother projects, fewer delays, and stronger client trust. EN 1090-1 compliance, implemented thoughtfully, supports safer structures and more efficient construction across the industry.