Antique and classic motor yachts are full-displacement steel or wooden powerboats built before approximately 1960, or contemporary vessels closely replicating their exterior form and construction. Originally built as steam yachts, private launches, and gentlemen's motor cruisers, surviving examples have been converted to modern diesel propulsion while retaining their period exterior profiles, funnels, and interior character.
The appeal of the type is historical and aesthetic rather than practical: a pre-war steel motor yacht with a round-bilge displacement hull is slower, less fuel-efficient, and more maintenance-intensive than any contemporary motor yacht of the same length. Running and restoration costs are high, and finding skilled craftspeople for traditional steel and wood work is increasingly difficult. Documented provenance — original owner history, design attribution, participation in significant historical events — substantially affects value. Buyers are collectors and enthusiasts rather than buyers seeking a primary cruising vessel.
Original steam yachts were constructed with steel plate hulls over framed structures; the superstructure was typically teak or aluminium. Modern diesel conversions retain the original hull and superstructure while replacing the steam machinery with shaft-driven diesel engines — commercial marine diesels from established suppliers suit the displacement hull form and provide the reliability these vessels require. Decorative funnels, where present on converted steam yachts, are retained as non-functional exterior elements. Interior joinery is typically mahogany or teak, either original or period-accurate restoration work.
