Sub-250g Drone Rules in the UK — Complete Overview

Why Sub-250g Drones Have Different Rules

The Civil Aviation Authority (CAA) classifies drones weighing less than 250g as posing a lower risk to other airspace users and people on the ground. This lower risk profile means sub-250g drones benefit from specific regulatory relaxations under the Open Category framework. However, lighter rules does not mean no rules. Understanding exactly what applies to your sub-250g drone is essential before you take off.

The distinction matters because many popular consumer drones fall into this weight class, including the DJI Mini series and several models from Autel and HolyStone. If you fly any of these in the UK, the rules outlined below apply directly to you.

Flyer ID: Required for All Sub-250g Drone Pilots

Since November 2020, every person who flies a drone in the UK must hold a valid Flyer ID, regardless of the drone's weight. This applies to sub-250g models without exception. To obtain your Flyer ID, you must pass an online theory test administered through the CAA's registration portal at register-drones.caa.co.uk.

The test consists of 20 multiple-choice questions drawn from a bank of 40 possible answers covering airspace rules, safety principles, and privacy considerations. The Flyer ID costs 10.33 per year and must be renewed annually. You do not need to display the Flyer ID on your drone, but you must be able to present proof that you hold one if asked by authorities.

Operator ID: When It Applies to Sub-250g Drones

The Operator ID requirement works differently for sub-250g drones compared to heavier models. If your sub-250g drone is used purely for recreational purposes and does not carry a camera capable of capturing personal data, you may not need an Operator ID. However, most consumer drones — even those under 250g — are equipped with cameras, which means an Operator ID is likely required in practice.

If you do need an Operator ID, it must be physically labelled on every drone you operate. The Operator ID is obtained through the same CAA registration portal and is included in the 10.33 annual registration fee alongside the Flyer ID.

Airspace Rules That Still Apply

Sub-250g drones must comply with all standard airspace restrictions in the UK. These rules apply regardless of weight:

• Maximum altitude: 400ft (120m) above ground level at all times
• Visual Line of Sight (VLOS): You must be able to see your drone with the naked eye throughout the entire flight, without relying on binoculars or the drone's camera feed
• Flight Restriction Zones (FRZs): You must not fly within FRZs around airports and airfields without specific permission from air traffic control
• Restricted airspace: Military zones, danger areas, and temporarily restricted airspace are all off-limits
• Distance from airports: Beyond the FRZ boundary, you must maintain awareness of manned aircraft and give way at all times

Flying Over People: C0 vs Legacy Drones

This is where the sub-250g category splits into two distinct groups, and the difference is significant:

Sub-250g Drones Without a Class Mark (Legacy)

If your sub-250g drone does not carry a C0 class marking, it is treated as a legacy drone. You may fly it in the Open A1 subcategory, but you must not intentionally fly over uninvolved people. While you are not required to maintain a fixed horizontal distance from people, you should avoid overflying anyone who has not consented to be part of your flight operation.

Sub-250g Drones With a C0 Class Mark

Drones that carry the official C0 class mark and weigh under 250g are permitted to fly over uninvolved people. This is a meaningful advantage for pilots who need to operate in populated areas. However, even C0-marked drones must not fly over crowds or organised assemblies of people. The distinction between uninvolved people and crowds is important — a few pedestrians on a pavement is different from a music festival or sporting event.

Privacy and Data Protection

All drone operators in the UK, including those flying sub-250g models, must comply with data protection legislation. If your drone has a camera, you should consider how your footage might capture identifiable individuals. The Information Commissioner's Office (ICO) provides guidance on drone use and personal data. Key obligations include not recording people without a legitimate reason, not publishing footage that identifies individuals without their consent, and being transparent about your filming activities when asked.

Where Sub-250g Drones Cannot Fly

Even with the relaxed rules for lightweight drones, several locations remain off-limits or heavily restricted:

• Prison grounds and their immediate vicinity
• Military installations without prior authorisation
• Near emergency response scenes where your drone could interfere with operations
• National Trust and English Heritage sites often have their own drone policies that prohibit flying regardless of drone weight
• Inside Flight Restriction Zones around major airports, typically extending several kilometres

Common Misconceptions About Sub-250g Drones

The most persistent myth about sub-250g drones is that they are completely unregulated. This is false. While the weight class does offer advantages — no requirement for a specific operational authorisation, the ability to fly closer to people with a C0 mark, and simpler registration requirements — the core safety framework applies in full. You still need a Flyer ID, you still cannot exceed 400ft, and you still cannot enter restricted airspace.

Another common misunderstanding is that sub-250g drones can be flown anywhere outdoors. In reality, landowner permission may still be required for take-off and landing, and many parks, reserves, and heritage sites prohibit drone flights through their own bylaws.

Penalties for Non-Compliance

Flying a sub-250g drone in breach of CAA regulations can result in significant penalties. Depending on the nature of the offence, you could face an unlimited fine or up to five years in prison for the most serious airspace violations. Even lesser infractions, such as flying without a Flyer ID, can lead to fixed penalty notices and confiscation of your equipment. The CAA works closely with local police forces to enforce drone regulations across the UK.