Drone Class UK1 Rules — UK-Specific Marking Guide (2026)

What Is the UK1 Class Marking?

Following Brexit, the UK CAA established its own drone class marking system independent of EASA. The UK1 class covers drones with a Maximum Take-Off Mass (MTOM) below 900 g, mirroring the EASA C1 class in weight limit and intended operational scope.

The UK1 marking signifies that a drone has been assessed against UK-specific technical standards. These standards address maximum kinetic energy on impact, noise emissions, electronic identification readiness and other safety parameters. The marking scheme is set out in the Air Navigation (Amendment) Order, which creates the legal basis for UK class marks distinct from the EU system.

Manufacturers must apply directly to the UK CAA to obtain authorisation to affix the UK1 mark. This application process is entirely separate from the EASA type examination that produces C1 markings. A drone with a C1 label does not automatically hold UK1 status, and a UK1-marked drone does not hold C1 status in EU member states.

UK1 Operating Rules in the Open Category

A UK1-marked drone operates in the Open Category A1 sub-category, but with a critical limitation compared to UK0: the pilot must not intentionally fly over uninvolved people. The full operating conditions are:

• Flight near uninvolved people: Permitted. The drone may pass near people who are not participating in the operation. However, the pilot must not deliberately maintain sustained flight directly over uninvolved persons.
• Assemblies of people: Flight over assemblies of people (defined as gatherings where the density would prevent individuals from moving away) is prohibited.
• Maximum altitude: 120 m (400 ft) above the closest point of the earth’s surface.
• Visual line of sight: Mandatory at all times. No FPV-only flying without a competent observer.
• Flyer ID: Required. The remote pilot must pass the CAA online theory test.
• Operator ID: Required. The drone weighs 250 g or more, so operator registration is mandatory. The Operator ID must be displayed on the aircraft.
• Noise requirements: UK1 drones must meet defined noise emission levels. The manufacturer must provide a declared noise level in the product documentation, and the drone must not exceed the specified limits during standard flight operations.

UK1 vs EASA C1 — Where They Diverge

UK1 and EASA C1 share the same 900 g weight ceiling and operate under the A1 sub-category with similar restrictions regarding uninvolved persons. The differences lie in the regulatory and administrative framework:

• Noise testing: Both systems require declared noise levels, but the test standards and assessment bodies differ. UK1 noise assessment follows UK-adopted standards, while C1 follows the EU harmonised standards under Regulation 2019/945.
• Electronic identification: EASA C1 drones must support direct remote identification broadcasting. UK1 drones must be capable of electronic identification as defined by the CAA, though the implementation timeline and technical specifications may differ from the EU approach.
• Kinetic energy limit: Both UK1 and C1 impose a maximum kinetic energy of 80 J on impact at terminal velocity. The testing methodology for this limit follows similar principles but under separate regulatory authority.
• Market authorisation: A manufacturer holding C1 authorisation from an EU notified body must make a separate application to the CAA for UK1 authorisation. There is no mutual recognition agreement covering drone class marks between the UK and EU.

Transition Period and Market Reality

The practical situation for UK1-class drones mirrors the broader transition challenge across all UK drone classes. As of 2026, very few drones on the UK market carry the UK1 mark. The DJI Air 3 and similar mid-range consumer drones carry EASA C1 markings in some configurations, but dedicated UK1-labelled versions are rare.

The CAA has confirmed that EASA C1-marked drones are accepted as equivalent to UK1 during the transition period. This means a pilot flying a C1-marked drone in UK airspace receives the same operational privileges as if the drone bore a UK1 mark. The transition period has been extended several times, and no firm end date has been announced.

Drones in the 250 g to 900 g range that carry no class marking at all — legacy or transitional aircraft — may still be flown under the Open Category, but the pilot must follow the more restrictive A1 legacy rules. Specifically, legacy drones in this weight range must not be flown over uninvolved people at all, whereas a UK1 or C1-marked drone may fly near (but not intentionally over) them.

Manufacturer Application Process

To obtain UK1 marking authorisation, a manufacturer must:

• Prepare a technical file demonstrating compliance with UK-specific requirements for construction, kinetic energy limits, noise levels, maximum speed and electronic identification.
• Submit the technical file to the CAA or a CAA-approved assessment body.
• Receive authorisation before affixing the UK1 mark to any drone sold in the UK market.

The cost and timeline of this process have been cited by industry commentators as reasons for the slow uptake of UK-specific marks. Many manufacturers view the UK market as insufficient in volume to justify a separate compliance exercise when the CAA continues to accept EASA marks during the transition.

What This Means for You as a Pilot

If you fly a drone weighing between 250 g and 900 g in the UK, the following applies:

• Check whether your drone carries a UK1, C1 or no class marking. This determines exactly how close you may fly to uninvolved persons.
• You need both a Flyer ID and an Operator ID. The Flyer ID requires passing the CAA online theory test (free). The Operator ID costs £10.33 per year and must be renewed annually.
• Night flying requires a green flashing light visible from the ground.
• All standard airspace restrictions apply, including Flight Restriction Zones around airports, prisons and military sites.

Penalties

Open Category offences carry fines of up to £2,500. Flying without the required Flyer ID or Operator ID is a separate offence with its own penalties. More serious breaches, such as endangering other aircraft or operating in restricted airspace, can lead to criminal prosecution under the Air Navigation Order 2016.