Every class-marked drone carries a sticker — C0, C1, C2, C3, or C4. But what actually guarantees the manufacturer was entitled to put that sticker on? Until now, the answer was scattered across the articles of Delegated Regulation (EU) 2019/945 — legal text, not a testable specification. EN 4709-001:2026, published by the European Committee for Standardization (CEN), is the first document to turn those articles into concrete, measurable criteria that certification bodies and manufacturers can actually test a drone against.
What the standard actually does
Regulation 2019/945 requires an open-category drone to be safe, controllable, and to minimize risk to people — but the regulation's text alone doesn't say how to measure that in a lab. EN 4709-001:2026 closes that gap: it defines specific test procedures and numeric thresholds for each of six classes (C0–C6), so a manufacturer can demonstrate compliance through a repeatable test rather than an interpretation of legal language.
Some of these numeric thresholds already exist in the 2019/945 text itself, and the standard operationalizes them into testable form. For example:
| Class | Max MTOM | Max speed | Additional criterion |
|---|---|---|---|
C0 | < 250 g | 19 m/s | sharp edges avoided where technically feasible |
C1 | < 900 g (or alternatively — impact energy to the head < 80 J at terminal velocity) | 19 m/s | mechanical resistance, propeller guard |
C2 | < 4 kg | — | 120 m altitude limit, configurable altitude system |
C3/C4 | < 25 kg | — | broader construction and stability criteria |
The C1 criterion is a good example of why the standard is needed: the regulation allows two alternative compliance paths — either mass under 900 g, or a demonstrated impact energy under 80 J if the drone strikes a person's head at terminal velocity. Without a standardized test method, every manufacturer could measure that number differently. EN 4709-001:2026 sets a single test protocol for this and other criteria — speed, altitude limit, sharp-edge avoidance.
Not a consumer safety seal
It's tempting to read a new standard as "this drone is now safer" — that's the wrong takeaway. EN 4709-001:2026 is a compliance and testing benchmark for certification bodies and manufacturers, not a consumer rating or recommendation. It doesn't compare which drone is "better" — it verifies whether a specific model meets the class the manufacturer declares for it. A drone can fully satisfy C1 requirements and still not be "safer" than a competitor that meets the same requirements through a different design. The standard is a mechanism, not a marketing claim, and it should be read that way.
Why this matters to you, not just the manufacturer
The class marking you check on a drone's box or its declaration of conformity directly determines which subcategory — A1, A2, or A3 — you're allowed to fly that specific drone under, regardless of your own certificate level. EN 4709-001:2026 is the mechanism behind that marking: it defines how a certification body actually verifies that a manufacturer's declared class matches reality. If you want to understand which class you need for a given flight, start with our piece on the differences between Open category A1, A2, and A3. If the drone you're considering carries no class mark at all, that's a different situation — see what to do about an unmarked drone in Latvia.
Publishing a standard is not the same as retesting every drone overnight
Publishing the standard doesn't mean every drone currently on the market went through retesting overnight. Certification takes time, and it's worth understanding as a buyer: a drone already on the market with a valid declaration of conformity and CE mark can likely keep selling under the previous rules while the full transition to the new test methodology plays out. Available sources don't specify an exact transition deadline or how quickly manufacturers will adapt their testing to the new standard — treat that as an ongoing process, not a completed fact. The practical takeaway for a buyer doesn't change: check the specific drone's class marking and the manufacturer's declaration of conformity at the time of purchase, rather than relying on this article as a permanently current snapshot.
What matters right now
EN 4709-001:2026 doesn't introduce a new law and doesn't change which subcategory you're allowed to fly in — it makes more precise the mechanism that already sits behind every class sticker you see on a drone box. For a buyer, that means one thing: the class marking now rests on a stricter, repeatable test, rather than just the manufacturer's self-declaration.
Still not sure which class you actually need? See our guide to choosing your first drone's weight class.
