The Lagoon 620 is a recreational catamaran, built predominantly of vacuum infused polyester fiberglass sandwich, with wood trim. It has a fractional sloop rig, with a deck-stepped mast, two sets of swept spreaders and aluminum spars with 1X19 stainless steel wire rigging. 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. It displaces 71,076 lb (32,240 kg).[1][2][3][11]
The boat has a draft of 5.09 ft (1.55 m) with the standard twin keels.[1][2][3]
The boat is fitted with twin 110 hp (82 kW) diesel engines for docking and maneuvering. The fuel tank holds 343 U.S. gallons (1,300 L; 286 imp gal) and the fresh water tank has a capacity of 253 U.S. gallons (960 L; 211 imp gal).[1][2][3]
The design has sleeping accommodation for eight people, with a number of different four cabins interior layouts in the port and starboard hulls. In all layouts each cabin has a private head with a shower. The main salon has an L-shaped settee and a forward-facing navigation station. The galley is of straight configuration and is equipped with a four-burner stove, a refrigerator, freezer and a double sink. Cabin maximum headroom is 81 in (206 cm). There is also an aft cockpit lounge and seating on the flying bridge.[3][7]