Buying a Used Boat? What Does a Marine Survey Actually Tell You?

You've found the boat. It looks fantastic, the engines sound good, and you've already started planning your first weekend away.

The seller assures you everything works perfectly so, do you really need to spend more money having somebody inspect it?

Almost certainly, yes.

A pre-purchase marine survey is one of the most important steps when buying a used boat. It won't guarantee you'll never have a problem, but it can reveal issues that aren't obvious during a viewing. And some of those issues can be rather expensive.

What does a marine survey actually cover?

Think of a marine survey as something similar to a building survey when buying a house.

An independent surveyor examines the boat's condition, looking for structural problems, defects and potential safety concerns. Depending on the vessel and the agreed scope, they'll typically inspect the hull, decks, bulkheads, fittings, steering systems, electrical installations and accessible machinery.

On a GRP boat, they'll look for signs of damage, moisture and potential osmosis. On a wooden boat, they'll be particularly interested in the condition of the timber. For sailing yachts, the keel, rigging and associated structures are important areas.

The surveyor will usually want the boat lifted out of the water to inspect everything below the waterline.

You then receive a written report detailing the findings, often with recommendations for repairs or further investigation.

What doesn't a survey tell you?

This is where buyers sometimes get caught out. A standard survey doesn't necessarily include a detailed mechanical assessment of the engines. A surveyor might identify obvious problems, but they generally won't dismantle an engine or guarantee its internal condition.

If you're buying a twin-diesel motorboat, commissioning a separate engine inspection could be money well spent. The same applies to specialist equipment and rigging.

And don't forget the sea trial. A boat can look wonderful sitting in a marina but behave very differently when underway.

Ideally, you want to see how the engines perform under load, how the boat handles and whether the onboard systems work as expected.

What happens if the survey finds problems?

Firstly, don't panic.

Very few used boats receive a completely clean bill of health. There will almost always be something that needs attention, particularly on older vessels. The important thing is understanding the difference between routine maintenance and something more serious.

Worn anodes? Fairly straightforward.

Evidence of significant structural damage or serious engine problems? That's another conversation.

Depending on your purchase agreement, material findings may give you grounds to renegotiate the price, ask for repairs or withdraw from the purchase.

The RYA's boat-buying guidance recommends ensuring your offer is subject to survey and, where appropriate, a sea trial.

Make sure you understand those conditions before signing anything.

How much does a boat survey cost?

It depends on the boat's size, construction, location and the type of inspection required.

For many recreational boats, expect to pay several hundred pounds, potentially exceeding £1,000 for larger or more complicated vessels. You'll also need to consider lifting charges and any specialist inspections.

When choosing a surveyor, look for someone experienced with your particular type of boat.

The Yacht Designers and Surveyors Association (YDSA) and International Institute of Marine Surveying (IIMS) both provide directories to help you find qualified professionals.

A survey is money well spent

At SALT, we help customers finance new and used boats, and surveys are a regular part of that process.

Our team understands boats, not just finance, so we're always happy to talk through the practicalities of a purchase. Simply call us on 0333 090 2368 for a friendly chat.

If you're considering your next boat, you can explore what's available through Boats On Finance or get an instant illustration using our boat finance calculator.

Just remember that the cheapest boat isn't always the best value. Spending a little on a proper survey before buying could save you considerably more afterwards. That's money you'd probably rather spend enjoying your new boat.

For more top tips on buying a boat and what to look out for, why not take time to read SALT's Boat Buying Guide here.

Frequently asked questions

Is a marine survey compulsory when buying a used boat?

Not generally, but your insurer or finance provider may require one. It's strongly recommended regardless.

Who pays for a pre-purchase boat survey?

Normally the buyer, including any associated lifting or specialist inspection costs.

Can I negotiate after a boat survey?

Potentially, yes. Significant defects may justify renegotiating, depending on the terms of your purchase agreement.

Finance disclaimer: Finance is subject to status, affordability and approval. Your boat provides security for the loan and may be repossessed if repayments are not maintained.