What to Look For in a Classic Wooden Boat Survey

Buying a classic wooden boat is one of the most rewarding decisions an enthusiast can make, but it comes with responsibilities that simply do not apply to fibreglass or aluminium vessels. Wood is a living material — it swells, shrinks, checks, and rots — and only a qualified marine surveyor who specialises in traditional construction can tell you what you are actually buying. Before you put any money down, commission a full out of water survey by a Society of Accredited Marine Surveyors (SAMS) or National Association of Marine Surveyors (NAMS) member who lists wooden vessels as their primary focus.

The hull inspection is where surveys most often produce surprises. A good surveyor will probe every accessible plank with a calibrated moisture meter, tapping systematically to locate soft spots caused by trapped water and early stage rot. Pay particular attention to the garboards — the planks running closest to the keel — and the area around any through hull fittings. These zones collect moisture longest and are statistically the first to fail. On lapstrake hulls, the surveyor should inspect every overlapping seam for fastener sickness, a condition where iron or steel fastenings corrode and stain the wood around them even before structural failure becomes visible.

Frames and floors are the skeleton of a wooden boat, and reframing a hull is expensive enough to make an otherwise attractive vessel a financial burden. The surveyor will check frames for compression failures, cross grain cracking, and the telltale springiness of soft wood. Sister frames — short reinforcing timbers sistered alongside a failed original — are acceptable in moderation, but a hull that shows widespread sistering suggests a history of deferred maintenance. Ask for a percentage estimate of how many frames are original and sound, and factor reframing costs into your purchase offer accordingly.

The keel and deadwood deserve dedicated scrutiny. On lead keel boats the surveyor will look for keel bolt weeping, the rust staining that signals that iron keel bolts are corroding from within the ballast pocket. Replacing keel bolts on a classic yacht can easily run to several thousand dollars per bolt once haulout, labour, and materials are counted. Bronze bolts cost more initially but they last a generation longer and dramatically reduce this risk in the survey report. On flat bottomed powerboats with timber keels, look for hogging — a longitudinal bend where the middle of the boat has sagged over decades — which cannot be corrected without major structural rebuilding.

The engine survey should always be conducted by a certified marine mechanic separate from the hull surveyor. Classic wooden powerboats frequently carry original or period correct engines that require specialist knowledge — a Chrysler Hemi, a Gray Marine, or a converted automobile engine from the 1940s and 50s is not something a generalist marine mechanic can assess with confidence. Request a compression test, oil analysis, and a documented sea trial at full throttle. Exhaust colour, temperature readings, and raw water flow are your early warning system for expensive problems downstream.

Finally, review the paperwork with the same rigour you give the hull. A clean documented ownership chain, copies of previous surveys, a valid certificate of documentation, and a US Coast Guard or state registration record all reduce your legal and financial exposure. Boats without clear title or with liens outstanding can create problems that persist long after you have taken delivery. A professional survey combined with a title search is not an optional expense — it is the foundation of any sound classic boat purchase, and the single best investment you will make before the money changes hands.