What Is The Most Expensive Thing To Repair On Boat

The most expensive thing to repair on a boat is typically the engine or engines—especially on larger vessels or those with high-performance, inboard, or diesel engines.

Top 5 Most Expensive Boat Repairs (Ranked)

 (1)  Engines (Inboard/Outboard/Diesel)  -- Repairs or full replacement can cost $5,000–$100,000+, depending on size and type. Labor, electronics, and parts add up fast.

(2) Hull Damage (Structural or Delamination) -- Hull repairs—especially fiberglass, carbon fiber, or keel repairs—can reach $10,000–$50,000+. And if the damage involves the stringers or core, costs can skyrocket from there.

(3)  Electrical Systems -- Rewiring or replacing complex marine electrical systems, including navigation, battery banks, and controls, can run $5,000–$30,000+. Saltwater corrosion compounds any existing issues.   

(4) Fuel Systems (Tanks, Lines, Contamination) -- This is especially true on older boats. Replacing a corroded or inaccessible fuel tank can cost $5,000–$15,000+.  This often requires cutting into the deck.   

(5) Transom or Stringer Rot -- Structural wood rot in the transom or stringers (from poor sealing or water ingress) can require major teardown and fiberglass work—$8,000–$20,000+.   

The Hidden Dangers of Neglected Maintenance

Many "expensive repairs" come from deferred maintenance. For example, not flushing outboard engines can lead directly to engine corrosion.  Ignoring soft spots can mean costly stringer repair.  And skipping bilge pump checks may result in flooding and hull damage.  Don’t defer necessary maintenance.  The technicians at Ventura Boat Services are happy to take a look and see what might need to be done with your boat.