[7][11] The Lagoon 620 is a recreational catamaran, built predominantly of vacuum infused polyester fiberglass sandwich, with wood trim.

The hulls have slightly raked stems, reverse transoms with swimming platforms, dual internally mounted spade-type rudders controlled by dual wheels located on the flying bridge, and twin fixed fin keels.

[1][2][3] The design has sleeping accommodation for eight to 14 people, with a number of different four- to six-cabin interior layouts in the port and starboard hulls.

The galley is of straight configuration and is equipped with a four-burner stove, a refrigerator, freezer and a double sink.

[2] In a 2015 review for boats.com, Zuzana Prochazka wrote, "at over 70,000 pounds this is not a light cat, despite the infusion molded construction.