Owners and Brokers' Used Catamaran Pre‑Purchase Checklist: 8 Critical Checks

Before you order a full survey, run a compact but thorough pre-purchase sweep to catch the big-ticket risks that commonly derail used catamaran deals. This checklist targets hull and structural integrity, deck fittings, rig and sails, propulsion and systems, underwater gear, safety and electronics, interior condition, and paperwork - practical checkpoints that owners and brokers can perform dockside to prioritize specialist inspections.

Start with hull and structural checks. Look for signs of osmosis blistering, soft spots underfoot, and separation at transverse bulkheads. Apply light pressure to suspect areas, inspect gelcoat for blistering or discoloration, and test the bridge-deck for deflection under load. Any hint of delamination or persistent dampness means call a structural surveyor with composite experience.

Inspect decks and hardware next. Examine chainplates and toerails for through-bolts, backing plates, and corrosion around fasteners. Open hatches and check backing material, inspect toerail fastenings for movement, and look for staining that suggests water migration. Corroded fasteners and compromised backing are workable, but they demand prompt attention from a rigger or a marine carpenter.

For sailing cats, assess rig and sails. Verify service history and age of the mast, standing rigging, turnbuckles, and furler. Check sail cloth for UV degradation, chafe at telltales and clew attachments, and the condition of stitching. If the rig record is thin or the wire shows pitting, book a certified rigger to perform a standing rigging survey.

Propulsion and onboard systems deserve a hands-on review of service records. Confirm recent maintenance on engines, transmissions, sterndrives or outboards, batteries, charging systems, watermakers, and generators. Run engines at idle and under load where safe, check for smoke, unusual vibration, and service stickers. Lack of documented service increases the chance of expensive surprises.

Underwater gear often dictates survey priority. Inspect propellers for nicks, check shaft alignment and packing glands, operate seacocks, and verify zincs and anodes are present and not fully consumed. Any wobble at the shaft or seized seacock needs a yard inspection.

Safety equipment and electronics must be current and functional. Check expiry dates on lifejackets, liferaft service records, and ensure AIS, VHF, chartplotters, and bilge pumps with alarms operate correctly. Replace or service expired lifesaving kit before stepping aboard for sea trials.

Inside, hunt for water damage, mildew, and evidence of leaks around windows, hatches, and through-deck fittings. Soft joinery or persistent damp smells point to ongoing ingress. Finally, verify paperwork: insurance history, documented refits, and clean registration. Confirm ownership and any liens before closing a deal.

Running these eight checks dockside gives owners and brokers practical leverage - prioritize costly fixes, estimate survey scope, and negotiate from knowledge rather than suspicion. Follow up suspected problems with targeted specialists so inspections translate into reliable value assessments and safe passages.