How long does a tonnage survey take?

A typical tonnage survey takes about 1–2 hours onboard, with a report usually delivered within 24 to 48 hours.

Who needs a tonnage certificate in the UK?

Any vessel under 24 metres seeking UK Part 1 registration requires a certified tonnage certificate. This enables registration, compliance, and eligibility for British flag status.

Do you assist with the Part 1 registration paperwork?

Yes. We provide full support, including help with forms, documentation, liaison with the UK Ship Register, and verification of vessel identity and compliance.

What is the difference between Gross Tonnage and Net Tonnage?

Gross Tonnage (GT) measures the total internal volume of the vessel, whereas Net Tonnage (NT) deducts non-earning spaces (e.g. machinery rooms, voids) to reflect the vessel’s earning capacity.

Tonnage Survey & UK Part 1 Vessel Registration

Professional Marine Tonnage Survey UK & Registration Services Across the UK

Looking to register your vessel under UK Part 1 or need a certified tonnage certificate? UK Boat Surveys offers MCA/IIMS-compliant tonnage surveys and measurement for pleasure and commercial boats under 24 metres, available both in-water or out-of-water.

With accredited training in MCA and IIMS tonnage measurement standards, we provide reliable, fast, and accurate surveys — fully recognised by the UK Ship Register and Maritime and Coastguard Agency (MCA).

Why have a Tonnage Survey?

An accurate tonnage survey UK measurement is essential for:

UK Part 1 vessel registration
Insurance and financing
Legal compliance
Proof of ownership
Cruising and operating in other countries
Maritime safety certificates

What Vessels Are Eligible?

We provide tonnage survey UK measurement and registration help for:

✔️ Sailing yachts & motorboats under 24m

✔️ Catamarans and trimarans

✔️ Commercial workboats, RIBs, tugs, and fishing vessels

✔️ Small passenger boats & crewed charter vessels

✔️ New builds or existing vessels requiring re-registration

UK Part 1 Vessel Registration – Simplified

We offer complete assistance with UK Part 1 registration, including:

Help completing MSF 4726 and supporting documentation
Verifying vessel identity, construction, and tonnage
Liaison with the UK Ship Register
Fast turnaround and expert support

Whether you are registering a new build, transferring ownership, or reflagging — we handle the paperwork so you don’t have to.

In-Water or Out-of-Water? No Problem.

Our tonnage survey UK measurement can be conducted either afloat or ashore, depending on your vessel’s situation. We’re flexible, mobile, and equipped to measure wherever your boat is located.

Our Tonnage Measurement Services Include:

✅ Gross Tonnage (GT) & Net Tonnage (NT) calculations

✅ Measurements of Load Line Length, moulded breadth, and moulded depth

✅ Surveys conducted in or out of the water

✅ Professional reporting for owners, brokers, and registrars

✅ Compliance with MCA/IIMS standards for vessels under 24m

Why Choose UK Boat Surveys?

🎓 Trained in MCA & IIMS tonnage measurement standards

⚖️ Fully insured and independent surveyor

📍 UK-wide service – we come to your vessel

📑 Clear, compliant reporting

👍 Trusted by brokers, owners, and marine professionals

FAQs - Your Boat Tonnage Survey UK Questions Answered

Here are answers to the most common questions we get from boat owners across the UK.

What is a tonnage survey?

A tonnage survey measures a boat’s internal volume to determine its Gross and Net Tonnage, which is required for UK Part 1 registration and other legal purposes. It is NOT the displacement (weight) of the boat.

Who needs a tonnage certificate?

Any vessel under 24 metres seeking UK Part 1 registration will need a certified tonnage certificate, issued by a qualified surveyor.

Can the survey be done while the boat is in the water?

Yes. We can conduct tonnage surveys either in the water or ashore, depending on access and vessel type.

How long does the process take?

A typical tonnage survey takes 1–2 hours on board, with reports usually delivered within 24 hours. Registration support may take a few days depending on the UK Registry processing times.

Can you assist with all the paperwork?

Yes. We provide end-to-end assistance with all forms, guidance, and liaison with the UK Ship Register.

Ready to Book Your Tonnage Survey UK?

Fast, professional, and fully independent boat surveys across the UK coastline – from Lowestoft to Milford Haven.