Does GPSR apply to self-assembled products?
If you combine loose products or components into a new whole—for example a gift set, a workshop kit, or a collection set—that assembled whole may be considered a separate product under GPSR. The regulation does not only look at who made something, but also at who gives a product a new purpose or composition and then places it on the market under their own name. Whoever does this may find themselves in the role of manufacturer, even if all the loose components are already safe and approved.
Whether this applies to your business depends on exactly what you do. Simply reselling a loose product without making any changes to it generally does not fall under this reasoning. But as soon as you combine components into a functional or coherent whole and offer it under your own name or brand, it often creates a new product in practice for which you bear responsibility yourself.
What makes assembly different from resale
The difference lies in whether a new product is created. A webshop that resells a ready-made item unchanged acts as a distributor and generally has a more limited set of obligations. But if, for example, you combine loose cosmetic products, a towel, and a candle into a care set, you are creating a new coherent whole. That whole has its own use situation, possibly its own risks in combination, and its own packaging with its own labelling. The same reasoning applies to construction kits, workshop kits with tools and materials, or toy sets that combine loose parts into one whole.
The regulation makes no exception here for the quality of the loose components. Even if each component individually already complies with the rules, that says nothing about the assembled whole. A combination of individually harmless components can in practice result in a different use situation than the components separately. For this reason, the assembler is in many cases seen as the person who places a new product on the market.
Why this matters for administration
If you are considered the manufacturer of the assembled product, a considerable amount shifts to your side. This means, among other things, that there should be a risk analysis of the whole as it is sold, not just of the loose components. Technical documentation, the required information on the product page, and the language of any warnings must also align with the assembled product. If you source from outside the EU and then assemble here, you also face the question of whether a responsible person in the EU must be designated for this new product.
This is immediately why many entrepreneurs encounter this problem late: the feeling is that nothing fundamentally changes because the components themselves are already familiar and trusted. The regulation, however, reasons from the product as the consumer receives it, and that is the assembled whole. see in a few questions which role fits your situation provides a first indication here, specifically tailored to your way of assembling and selling.
When it probably does not affect you
Not every combination of products leads to this situation. A box with loose, unmodified items that simply lie next to each other and remain recognizable as individual articles is closer to straightforward resale than to assembly. A temporary promotional bundle in which items remain separately packaged and can be used separately does not automatically have to be treated as a new product. The line between "bundling" and "assembling into a new whole" is not always sharp, and the regulation does not provide a fixed list of examples for this. Therefore, it is wise not to draw your own conclusions in case of doubt, but to have the situation assessed concretely.
How you work this out in practice
For those who find that assembly is indeed applicable, it is worthwhile to determine not only your role, but also immediately to consider what this means for the product dossier. In the knowledge base with explanations by topic you will find background information on risk analysis, technical documentation and the mandatory product page, separate from what you may already know about the individual components. Those who want to know how the information on gpsria.eu is developed and on what basis the role classification is based can read that back on the page about the working method behind the check.
On the overview of what is free and what comes with a subscription you can see which part of the dossier you structure yourself and which parts belong with a specialist, because gpsria.eu does not assess the safety of a product and does not itself act as an EU responsible party.
If you are in doubt about whether your method of assembly falls under this reasoning, do the free role check. It provides an indication within a few minutes, including the location in the official text, so you can assess for yourself whether further steps are necessary for your situation.