2026 Catamaran Diamond Yachts EF66

At just over 66 feet long but more than 32 feet wide, the EF66 creates a very different spatial experience from a conventional 65–70-foot monohull yacht.
 

Its appeal lies principally in volume, living space and the ability to configure the power-catamaran platform around an owner's intended use.

 

Is the 2026 Diamond Yachts EF66 Available for Sale?

The EF66 has been marketed as a new-build and customizable yacht opportunity, so buyers should confirm whether a particular listing refers to completed inventory or a build-to-order project.
 

Current market listings for the model also emphasize customization potential.

 

Diamond Yachts EF66 Price

The YachtTrading page currently shows a reference price around US$2.5 million, while other market listings may show different figures depending on specification and timing.
 

For a customizable build, the final contracted price can increase with interior upgrades, electronics, tender arrangements and other owner-selected equipment.

 

Performance and Cummins Power

The current YachtTrading specification lists twin Cummins QSB6.7 engines, approximately 12 knots cruising speed and 17 knots maximum speed.
 

The same specification gives an estimated 500-nautical-mile cruising range.

 

32-Foot Beam and Power-Catamaran Space

With a beam of approximately 32.08 feet, the EF66's biggest advantage is its usable width.
 

The catamaran platform creates room for large social areas, broad exterior spaces and accommodation that would be difficult to replicate on a conventional monohull of similar length.

 

Interior and Customization

The YachtTrading configuration currently lists four guest cabins and four bathrooms.
 

Other EF66 market material emphasizes customizable layouts, so the exact number of staterooms and arrangement can vary according to the specific build.

 

What to Check Before Buying an EF66

For a build-to-order boat, confirm shipyard specification, construction milestones, engine package, electrical system, generator, navigation equipment, warranties and change-order process.
 

For a completed yacht, survey both hulls, propulsion, steering, electrical and plumbing systems and compare the actual configuration with the original build specification.