CE marking step by step: the conformity process explained

# CE marking step by step: the conformity process explained

Short answer: CE marking follows a fixed order: define the product precisely, list the applicable EU legislation, check for exemptions and special cases, choose the New Legislative Framework assessment module, apply harmonised standards or justify alternatives, run tests and compile the technical documentation with the EU Declaration of Conformity, then maintain compliance across series production.

Key facts

• CE marking is the manufacturer's declaration that the product meets all applicable EU harmonisation legislation; it is not an EU approval.
• The process starts by defining the product, its intended use, its variants, and what is not included.
• Each applicable directive or regulation defines which conformity assessment modules are available for the product.
• The New Legislative Framework modules run from A (internal production control) to H (full quality assurance).
• Harmonised standards cited in the Official Journal confer a presumption of conformity when applied correctly.
• The technical documentation and the EU Declaration of Conformity must be kept available to authorities, typically for ten years.
• CE marking covers series production, not just the tested sample, and must be re-assessed when the design, components, or standards change.

1. Define the product precisely

Write down exactly what the product is, its intended use, its variants, and what is not included. This sounds administrative, but it is the foundation of everything that follows: the applicable legislation, the assessment module, the test plan, and the declaration all attach to a defined product. Scope creep later, a new variant, a new accessory in the box, a firmware update that adds a radio function, invalidates earlier assessment work and forces re-assessment.

The product definition should capture the commercial name and model designations, the intended use and the reasonably foreseeable use (including foreseeable misuse for consumer products), the complete configuration as placed on the market (accessories, chargers, software), the variants covered by a single assessment (colours, sizes, regional variants), and explicit exclusions. Keep this definition as a controlled document; it is the first page of the technical file.

2. List the applicable EU legislation

Work through the product's features and map each to candidate directives and regulations: powered (electrical safety, EMC), radio transmitter (Radio Equipment Directive), battery (Batteries Regulation), pressure, machinery, toys, medical purpose, construction use, and so on. The EU's product pages and the Blue Guide explain how the New Legislative Framework fits together across sectors, and the Commission's CE marking pages describe the duties of manufacturers, importers and distributors.

Two disciplines prevent the classic failure of missing an act. First, map features to legislation in writing, with a named owner for each candidate act's verdict (applies / does not apply / needs legal review). Second, revisit the map whenever the product changes: adding Bluetooth to a previously non-radio product adds the Radio Equipment Directive, and a new battery chemistry can change the applicable battery duties. The legislation list is a living document for the product's whole life.

3. Check for exemptions and special cases

Some directives exclude specific equipment: certain military or space equipment, some second-hand goods, products for the manufacturer's own use, and other defined exclusions. Confirm exclusions in the legal text rather than assuming them, because exclusions are narrowly drawn and often misunderstood. "Second-hand" does not exempt a refurbished product that has been substantially modified; "for professional use only" does not exempt a product from harmonisation legislation that covers professional equipment.

Also check for special cases within the applicable acts: transitional provisions when legislation is revised, simplified procedures for certain product types, and interactions between acts (for example, where the General Product Safety Regulation covers risks that sector legislation leaves open). Record the exemption analysis in the file, including the article relied upon, so a market surveillance authority sees reasoning rather than an assertion.

4. Choose the assessment module

The New Legislative Framework, set out in Decision No 768/2008/EC, defines standard conformity assessment modules from A (internal production control, the manufacturer's own assessment) through combinations such as A1, B+C, D, E, F, G, up to H (full quality assurance with a notified body's oversight of the quality system). Each directive specifies which modules are available for the products it covers; the manufacturer chooses among the available options.

For most low-risk consumer products, Module A applies: the manufacturer ensures the product meets the requirements, compiles the technical documentation, and issues the declaration without a notified body. Where a notified body is involved (EU-type examination under Module B, for example), the body assesses the product or the quality system and issues the corresponding certificates or approvals, which then support the manufacturer's declaration. Document the module choice per directive in the technical file; the choice must be defensible from the legal text, not from convenience.

5. Apply harmonised standards or justify alternatives

Using harmonised standards cited in the Official Journal gives a presumption of conformity with the essential requirements they cover. Identify the harmonised standards for each applicable directive, obtain the current versions, and apply them to the product as placed on the market. Where a standard offers alternative test methods or leaves implementation choices open, record which options were selected and why.

If you use other technical solutions instead of harmonised standards, the technical file must demonstrate how those solutions meet each essential requirement: a heavier burden that typically means more testing, more analysis, and more detailed justification. This route is legitimate, and sometimes necessary for innovative products that standards have not caught up with, but budget the extra engineering and documentation time honestly.

6. Test, document, and declare

Run the tests against the selected standards or justified alternatives, using competent (preferably accredited) laboratories, and keep the test reports. Compile the technical documentation: the product definition, design and manufacturing information, the risk assessment, the list of standards applied or alternative justifications, test reports, and any notified body certificates. Draw up the EU Declaration of Conformity identifying the product, listing the applicable legislation, and signed by an authorised person.

Then affix the CE marking according to the graphic rules: the prescribed proportions and geometry, visible, legible and indelible on the product or, where the product's nature requires, on its packaging and accompanying documents. Add the required traceability information (model, batch or serial number, manufacturer and importer identity) and the instructions and safety information in the language of each member state of sale. The CE marking goes on only when every step above is complete; affixing it early is not a shortcut, it is a false declaration.

7. Maintain compliance in series production

CE marking covers series production, not just the tested sample. Put production controls in place so that every unit matches the assessed design: incoming material checks, in-process controls, and final verification tied to the technical file. Re-assess whenever the design changes, components or suppliers change, software updates alter regulated functions, or the applicable harmonised standards are revised.

Set up post-market duties from day one: a process for handling consumer complaints, monitoring for safety signals, keeping traceability records, and taking corrective action up to withdrawal and recall if needed. Under the Market Surveillance Regulation framework, economic operators must cooperate with authorities, and the technical documentation must be producible on request throughout the retention period. A product that was compliant at launch and drifted out of compliance through uncontrolled changes is one of the most common findings in market surveillance.

Frequently asked questions

How long does the CE marking process take?

It depends on the product's complexity, the applicable legislation, and whether a notified body is involved. Simple products using Module A with available harmonised standards and an accredited lab can move in weeks; products needing notified body assessment, novel justifications, or extensive testing take months. The controllable variable is preparation: a complete product definition and legislation map shorten every later step.

Can I use test reports from my supplier?

Supplier test data can support the file, but the manufacturer remains responsible for the conformity assessment of the finished product as placed on the market. Verify that supplier reports cover the current materials and configuration, and supplement with testing of the finished product where the directives require it.

What triggers re-assessment?

Design changes, component or supplier changes, software updates affecting regulated functions, new product variants outside the assessed scope, and revisions to the applicable harmonised standards. Build a change-control gate that asks "does this affect the technical file" before any engineering change is released.

Where must the CE marking appear?

On the product itself, visibly, legibly and indelibly, following the prescribed proportions. Where the product's nature makes that impossible or impractical, the directives allow marking on the packaging and accompanying documents instead. Check the specific directive's marking provisions for your product.

Is the Blue Guide legally binding?

No. The Blue Guide is the Commission's guidance on implementing EU product rules; only the legal text of each harmonisation act has legal force. It is nevertheless the most useful single explanation of how the New Legislative Framework, conformity assessment, and market surveillance fit together.

What is the difference between the technical file and the Declaration of Conformity?

The technical documentation file is the complete evidence package (design, risk assessment, test reports, standards list). The EU Declaration of Conformity is the manufacturer's formal legal statement that the product complies, referencing that evidence. Authorities ask for the declaration first and the file behind it second.

Official sources

• EU CE marking: duties of manufacturers, importers and distributors
• Blue Guide on the implementation of EU product rules 2022
• EU market surveillance rules
• EU Access2Markets: product requirements per market

Last verified

September 2026. Procedural overview only; product-specific requirements live in the directives themselves. Always confirm the current consolidated text and the current Official Journal citations of harmonised standards.

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