What is WBC3 and Does My Vessel Need It?

If you operate a workboat commercially in UK waters, the Workboat Code Edition 3 (WBC3) is the regulation that governs your vessel's safety standards, certification, and crew requirements. It's published by the Maritime and Coastguard Agency (MCA) and given legal effect by The Merchant Shipping (Small Workboats and Pilot Boats) Regulations 2023.

Key points:

• WBC3 applies to all UK commercial workboats and pilot boats operating at sea
• It replaced Workboat Code Edition 2 and MGN 280
• Existing vessels must transition to WBC3 by December 2026

What does it cover?

WBC3 sets out the technical requirements for:

• Design, construction, and structural integrity
• Stability
• Machinery and fuel systems
• Electrical systems
• Fire protection and firefighting equipment
• Life-saving appliances (lifejackets, lifebuoys, liferafts)
• Navigation and radio equipment
• Manning and crew qualifications
• Safety Management Systems (SMS)
• Cyber security

It's a complete compliance regime — if your vessel is certified under WBC3, it covers everything from how the hull is built to what certificates your crew need to hold.

In plain terms: there isn't one regulation for the hull, another for the crew, and another for the safety gear. WBC3 wraps it all into one Code. If you comply with it, you're covered. If you don't, your vessel can be detained by the MCA.

Which vessels does it apply to?

WBC3 applies to workboats and pilot boats in commercial use that operate at sea. Specifically:

• UK-flagged vessels, wherever they operate
• Non-UK vessels operating from UK ports in UK waters
• Vessels carrying cargo and/or not more than 12 passengers and industrial personnel combined

This includes harbour workboats, survey vessels, crew transfer vessels, dive support boats, tugs, safety standby vessels, and even remotely operated unmanned vessels (USVs) — which are covered under a dedicated section of the Code (Annex 2).

If you're unsure whether your vessel falls under WBC3, the simple test is: is it used commercially at sea and is it under 24 metres? If the answer to both is yes, WBC3 almost certainly applies.

What did it replace?

WBC3 replaced the previous Workboat Code Edition 2, MGN 280, and consolidated several older codes into a single framework.

Some key changes from the older codes:

• Crew qualifications tightened — for example, RYA Powerboat Level 2 was previously accepted for vessels up to 24m under MGN 280. Under WBC3, it's restricted to Category 6 only (within 3nm, daylight, open boats under 3GT).
• Cyber security is now a mandatory SMS requirement for all vessels (Section 31.3) — new to WBC3.
• Remotely Operated Unmanned Vessels (USVs) are covered for the first time under a dedicated Annex 2 — making WBC3 the first workboat code in the world to legislate for unmanned commercial vessels.
• Lithium-ion battery and alternative fuel requirements are included for the first time.

Transition Deadline — December 2026

If you haven't started the transition yet, now is the time to talk to your Certifying Authority about what's involved.

One important point: you cannot mix codes. You can't keep some parts of WBC2 and adopt other parts of WBC3. Once you transition, you comply with WBC3 in full. This also means your SMS, crew qualifications, and equipment carriage may need updating — the requirements have changed in several areas.

Do I need it?

If your vessel is used commercially at sea — even if it's a small open boat doing harbour work — it almost certainly needs WBC3 certification. The only exceptions are vessels that fall under other specific codes (e.g. the Rescue Boat Code for independent rescue boats, or the Sailing Vessel Code for commercial sailing vessels).

The first step is choosing a Certifying Authority, who will examine your vessel and issue the Workboat Certificate. The MCA publishes the full list of authorised Certifying Authorities at gov.uk.

Read next: How to Get Your Workboat Certified Under WBC3 →

Sources: WBC3 Sections 1.1–1.10, 3.8, 31.2. The Merchant Shipping (Small Workboats and Pilot Boats) Regulations 2023.