Marine Survey Checklist: What a Surveyor Inspects

A marine survey is a structured inspection of a boat's condition, carried out by a qualified surveyor. The surveyor examines the hull, structure, systems, and equipment, then produces a written report detailing findings and recommendations. For anyone buying a used boat, a pre-purchase survey is a critical step in the process. Marine surveys are also required for insurance underwriting and financing. The cost ranges from €400 to €800 for a typical 30 to 40-foot vessel, and the report can identify problems that would cost far more to repair. Understanding what a surveyor inspects helps buyers prepare and interpret the results.

The three stages of a pre-purchase survey

A pre-purchase survey has three main components. The first is the out-of-water inspection, where the surveyor examines the hull bottom for osmosis, keel damage, and through-hull fittings. This requires the boat to be hauled out at a boatyard. The second is the in-water inspection, covering the deck, superstructure, rigging on sailboats, engine, electrics, plumbing, and safety equipment. The third is the sea trial, where the surveyor runs the engine under load and tests the steering, sails, and handling. Not all surveys include a sea trial, so buyers should confirm this in advance.

The survey report

The surveyor's report is a detailed document that lists every finding, categorized by severity. Critical findings — such as structural damage, engine problems, or safety deficiencies — may render the boat uninsurable or require immediate repair. Less serious findings, such as cosmetic issues or aging components, are noted for future attention. The report typically includes a valuation, which buyers can use to negotiate price or confirm that the asking price is fair. Buyers should read the report carefully and discuss any unclear findings with the surveyor. For sailboats and motorboats alike, the survey is a tool for informed decision-making, not a pass-or-fail test.

Choosing a surveyor

Choosing a qualified surveyor is as important as the survey itself. Buyers should look for a surveyor who is a member of a recognized body, such as the International Institute of Marine Surveying or the Society of Accredited Marine Surveyors. The surveyor should be independent of the seller and the broker. After receiving the report, buyers can use the findings to renegotiate, request repairs, or withdraw from the purchase. The boat survey checklist and the used boat buying guide provide additional context for what to expect during the survey process. Current sailboat listings on Owning can be filtered by location to find boats near an accredited surveyor.