The pre-purchase survey is the most important step in buying a used yacht. It's also the step most buyers know least about. This guide explains what a marine surveyor does, what they look for, how to read their report, and — critically — how to use survey findings in your negotiation without walking away from a good boat over minor issues.
What a Marine Surveyor Does
A marine surveyor is an independent expert — usually a qualified naval architect or experienced shipwright — who inspects the vessel on your behalf. They are not employed by the seller or by the brokerage. You commission them, you pay them, and they report to you. Their job is to tell you the truth about the boat's condition, not to facilitate a sale.
For a standard pre-purchase survey, the vessel is hauled out of the water (either at a boatyard or on a slip) so the surveyor can inspect the hull below the waterline. The survey typically takes one full day for vessels under 20 metres. After the haul-out inspection, the sea trial takes place — usually 2–4 hours under power and, if applicable, under sail.
What Surveyors Inspect: Area by Area
The surveyor will hammer-test the entire hull for delamination and osmotic blistering (GRP vessels), tap and probe for soft spots in the deck, check structural bulkheads for signs of stress, and inspect all through-hull fittings and seacocks. They will measure hull thickness in key areas using an ultrasonic gauge. Osmotic blistering — water ingress into the laminate — is the most common hull defect and ranges from cosmetic to serious depending on depth and extent.
Deck fittings, chainplates, stanchions, cleats, and hatches are all inspected for structural integrity and seal. Water ingress around deck fittings — typically visible as soft or discoloured deck core material — is extremely common and ranges from minor to expensive depending on how long it has been left. The surveyor will also inspect windows, portlights, and any acrylic panels for crazing or seal failure.
The surveyor witnesses a full engine run-up with full instrument readings, inspects raw water impellers, zincs, shaft seals, and gearboxes. They will note engine hours, check service records, look for oil leaks or exhaust smoke, and test the manoeuvring systems. For diesels, a compression test may be requested as an additional check. Generator hours and condition are separately noted.
The surveyor will test all navigation and safety electronics, inspect shore power connections, assess battery bank condition and age, and check bilge pumps, fire detection, and bilge alarm systems. Electrical failures are the most common cause of serious onboard incidents — a well-maintained electrical system is a major positive indicator for the rest of the boat's maintenance history.
Life rafts (expiry dates, hydrostatic release), EPIRBs, flares, life jackets, fire extinguishers, and all required safety gear is inspected and inventoried. Outdated safety gear is the buyer's cost to replace after purchase — it should be factored into the price negotiation.
Structural delamination covering more than 20% of the hull. Active water ingress into the bilge with no identified source. Serious osmosis requiring full hull treatment. Engine producing blue or black smoke under load with no explanation. Corroded or failed chainplates on a sailing vessel. Any sign of fire damage, impact damage, or major grounding, especially if undisclosed. These are not negotiating points — they are walk-away situations unless the seller offers a price that genuinely reflects the cost of repair.
Every survey finds something. A survey report that comes back completely clean is unusual and slightly suspicious — it may mean the surveyor didn't look hard enough. The presence of defects doesn't mean you shouldn't buy the boat; it means you have a basis for negotiation. The question is whether the defects are manageable in cost and scope. Let your broker guide you through what's significant and what isn't.
How to Use the Survey in Negotiation
Once the survey report is in hand, your broker will prepare a schedule of findings and estimated repair costs. This becomes the basis of a renegotiation with the seller. In most cases, buyers request either a price reduction to cover agreed items, or seller completion of specific repairs before closing. Sellers can accept, reject, or counter — it's a negotiation, not a demand. The experienced buyer focuses on the genuinely costly items and ignores the cosmetic list.
If the survey reveals something genuinely serious that wasn't disclosed — structural damage, a hidden grounding, a covered-up osmosis treatment — you have the right to withdraw and recover your deposit in full. Your broker will manage this process.
Buying a Yacht in Mallorca?
Our brokerage team will guide you through the survey process and help you negotiate on findings. Browse current listings in Palma and the Balearics.
View Current ListingsFinding a Surveyor in Mallorca
For vessels in Palma, we recommend using a surveyor accredited by the International Institute of Marine Surveying (IIMS) or the National Association of Marine Surveyors (NAMS). Palma has several excellent independent surveyors with long track records in this market. We maintain a list of qualified surveyors we can recommend — always independent from our own interests.
Average survey costs in Mallorca: €1,000–€1,800 for vessels 10–18m, €1,800–€3,500 for vessels 18–30m, €3,500+ for superyachts. The haul-out cost is in addition, typically €500–€1,500 depending on the boatyard and vessel size, and is normally shared between buyer and seller.