Sooner or later most boat owners get the letter: cover cannot be renewed without a current survey. It is rarely a judgement on your boat, and it is usually more straightforward to deal with than it first appears — provided you nail down what the insurer actually wants before you spend anything.
Why insurers want a survey
Marine insurers are underwriting a machine that sits in salt water, in weather, often unattended for months. The failures that generate the biggest claims — a perished hose below the waterline, a corroded seacock, a tired gas installation, standing rigging past its life, a wet and weakening deck — are all things a competent surveyor identifies well before they become a sinking or a fire.
A survey therefore does two things for the underwriter: it establishes condition at a point in time, and it produces a list of recommendations they can require you to act on. It also helps at claim time, because there is documented evidence of the vessel's state before the loss. That last point works in your favour more often than people expect.
At what age does it start?
There is no industry-wide rule, and this is where you must check rather than assume. As a general pattern across the UK market:
| Construction | Typical age when a survey is first required |
|---|---|
| GRP / fibreglass | Commonly around 20–30 years |
| Steel | Often earlier, and plate thickness readings frequently expected |
| Wood | Often much earlier, sometimes at any age |
| Aluminium | Varies widely by insurer |
Other triggers that commonly prompt a request regardless of age:
- Change of ownership. Some insurers ask on every purchase.
- A significant increase in the insured value.
- A change of use — adding chartering, racing, or liveaboard use.
- A change of cruising area, particularly moving offshore or leaving UK waters.
- After a claim, especially a grounding, fire, sinking or storm damage.
- Moving to a new insurer, who may not accept the previous one's arrangement.
- Long periods laid up or a gap in cover.
How often does it need renewing?
Typically every five to ten years once you are in the cycle, with wooden and steel vessels often at the shorter end. Some insurers instead ask for a fresh survey only when something changes.
Two practical points. First, insurers usually specify how recent a report they will accept — sometimes within the last twelve months, sometimes longer. A five-year-old survey you already hold may not qualify. Second, if you are buying and will also need cover, tell the surveyor both purposes up front. One properly scoped survey can usually satisfy the purchase and the insurer, which saves you the cost of a second inspection a fortnight later.
How an insurance survey differs from a pre-purchase survey
They overlap heavily, but the emphasis differs.
A pre-purchase survey is written for a buyer. It covers condition broadly, including cosmetic and maintenance matters, and its purpose is to inform a purchase decision and often a negotiation.
An insurance survey is written with the underwriter's concerns foremost: watertight integrity, structural condition, fire risk, gas and electrical safety, machinery installation, mooring and ground tackle adequacy, and safety equipment. It is generally more tightly focused, and its recommendations are framed as things to be done.
A full pre-purchase survey will normally satisfy an insurance requirement. The reverse is not reliably true — an insurance survey may not go into the depth a buyer wants. If you need both, ask for the pre-purchase scope.
Either way, expect the vessel to be out of the water. Most insurers will not accept a report where the underwater body was not inspected, and no meaningful assessment of the hull, skin fittings or stern gear is possible afloat.
What to ask your broker before booking
Get the answers in writing. This is the single most useful thing you can do, and it regularly saves people from paying for a survey their insurer will not accept.
- What exactly do you require? A full condition survey, an insurance survey, or a hull inspection? The words are not interchangeable.
- Must the vessel be out of the water? Almost always yes, but confirm it before you book a crane slot.
- Do you require any particular qualification or scheme membership? Some insurers name bodies such as the YDSA, IIMS or RINA. Others simply want an independent professional surveyor with relevant experience and professional indemnity insurance. Press them on the wording — "qualified" is used loosely and it matters.
- Do you maintain an approved surveyor list? If so, get it before choosing anyone.
- How recent must the report be?
- Do you need specific tests? Steel vessels often need ultrasonic plate thickness readings. Some insurers ask for rig inspection or an engine report.
- What is the timescale for completing recommendations, and do you need written confirmation the work is done?
- Will you accept the report if I later change insurer?
Send those answers to your surveyor with the enquiry. If the requirement cannot be met — a named membership that is not held, say — you should be told plainly rather than sold a report you cannot use.
Recommendations, and what happens if you ignore them
An insurance survey will produce recommendations, usually banded by urgency. Insurers typically require the urgent ones completed within a stated period and may ask for written confirmation, sometimes from the surveyor.
Take this seriously. If a report recommends replacing perished skin fitting hoses, you do not do it, and the boat later sinks because a hose failed, you have handed the insurer a straightforward basis for reducing or declining the claim. There is little point holding a policy that will not pay on the one failure you were warned about.
The recommendations are also, on the whole, a sound maintenance plan. Most are inexpensive: hoses, clips, anodes, gas hose dates, extinguisher servicing, flares, bilge pump float switches, an earth bonding connection. A prioritised list of exactly what your boat needs is worth having in its own right.
If cover is refused or loaded
Occasionally a survey produces findings serious enough that an insurer declines, restricts cover, or imposes a large excess. That is uncomfortable, but it is information you needed.
Your realistic options are to complete the required work and go back to them, to approach a specialist insurer — there are underwriters who write older wooden and steel craft that mainstream insurers avoid — to accept restricted cover such as third-party only while work is planned, or to reconsider whether the vessel makes sense for you.
What does not work is shopping for a surveyor who will write a more flattering report. Insurers see a great many surveys, an implausibly clean one on an older boat invites scrutiny, and a report that misrepresents condition is worthless at claim time — which is the only moment it truly matters.
Need a survey for your insurer?
Confirm your insurer's exact requirement in writing, then send it over with the vessel's details. You will be told plainly whether it can be met before anything is booked.
Related reading
- How much does a boat survey cost in the UK?
- How to prepare your boat for a survey
- GRP, wood, steel or aluminium: how each hull fails
- Frequently asked questions
Insurance requirements vary between insurers and change over time. Nothing here is a statement of any particular insurer's terms — always confirm the exact specification in writing with your own insurer or broker before booking a survey. Cost figures are indicative UK ranges as at August 2026.