Lagoon 421

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The Lagoon 421 is designed to meet the needs of sailors whose first concern is comfort and space, without sacrificing the pleasures of pure sailing.

Lagoon 421: living free and well

  • exceptional facilities and comfort
  • a practical and safe deck layout
  • easy-to-control sail plan (square-headed mainsail available as an option)


Lagoon expertise

  • infusion-moulding for increased weight saving (important for a catamaran), an optimal structure, and greater protection for the environment and shipbuilders
  • interior woodwork in Alpi® reconstituted wood, a sustainable source that comes in a choice of finishes: light oak or teak
  • vertical glazing for better protection against the sun and optimal space and height below deck
  • gull-wing bridge deck for greater comfort in heavy seas
  • centre beam designed to receive the forestay fitting, the anchor fairlead and the gennaker pole
  • flexible layout with 3 or 4 cabins
  • VPLP design: performance under sail guaranteed!


Above deck

  • rigid bimini flush with the coachroof for cleaner lines and better protection against the sun
  • easy and safe movement around rear deck
  • transom platforms for easy and safe boarding
  • cockpit and saloon are on the same level


Below deck

  • plenty of natural light in saloon and cabins (large hull windows)
  • double beds with side access in all cabins
  • each cabin has its own washroom and private shower
  • excellent ventilation in all parts of the boat
  • engine compartments are far from the living areas and perfectly insulated



« We tested her in a 13 to 15-knot breeze with some chop (…) We measured our speed using the GPS:
– Close-hauled under mainsail and jib: 6.4 knots
– 45° angle from the wind with mainsail and jib: 8.1 knots
– Wind on the beam with mainsail and jib: 6.4 knots
– 120° to the wind with mainsail and jib: 5.9 knots »

Multihull,UK – July 2009

« Coming out of the channel we met the full swell. The Lagoon 421 barely lost her way, pitched only slightly and did not slam into the waves. A good point for those wanting to sail long distances, and that probably means the majority of owners! » 
Multicoques Magazine, FR / Multihulls World, UK – April 2010

The Lagoon 421 comes in 2 versions

Essential: this version comprises all the essential features to ensure you get the best out of your Lagoon catamaran at a more affordable price.

Comfort: fully equipped for long-distance cruising.

Dimensions and specifications are approximations and subject to change without notice. Specifications of the Lagoon 421
Naval architects Marc Van Peteghem / Vincent Lauriot Prévost
Overall length 41'4''
Length on waterline 40'4''
Overall beam 24'7''
Draft 4'2''
Mast clearance 64'9''
Light displacement (EEC) 26835 lbs
Full-batten mainsail 714 sq. ft
Square top mainsail (optional) 748 sq. ft
Furling genoa 386 sq. ft
Optional gennaker 753 sq. ft
Fresh water capacity 2 x 46 US Gal.
Fuel capacity 2 x 79 US Gal.
Engine 2 x 40 HP
Interior finish Light oak alpi and non skid laminated wenge for the wood floor
EEC certification A for 11 persons