FairKeel → Buyer's guides → Lagoon 400
2009–2017 · designed by Marc Van Peteghem and Vincent Lauriot-Prévost (VPLP) · built by Lagoon
Accommodation-focused cruising catamaran with a sheltered cockpit and owner or four-cabin layouts. The later S2 revised the interior. A buyer should compare the actual living arrangement and service access rather than treating every 400 listing as the same fit-out.
Check this first — Covers original 400 and later 400 S2. The dimensions and light displacement below use the September 2013 S2 specification; sail area is its standard 56 m² main plus 28 m² genoa. Earlier specifications and optional sails differ. Confirm revision, layout and propulsion from build records; Lagoon 40 is a separate model.
This is a general read on the Lagoon 400 class — informed background, not a verdict on any individual boat. Condition, refit history, and how a particular hull was sailed and stored matter far more than class reputation. Use it to know what to look for; for a read on a specific listing, run a free FairKeel report on that boat.
Looking at a specific Lagoon 400? Run it free → We grade that listing's own claims against what's known about the class, and flag the gaps a survey would catch. Free, no account.
The S2 specification identifies balsa sandwich above the solid hull bottom. Ask for a survey of penetrations and previous repairs, with findings located against the construction rather than a blanket wet-core verdict.
Obtain drive identification and maintenance evidence for each hull. Ask the engineer to inspect corrosion protection, cooling and seals using the installed manufacturer's instructions.
Include the mast support and loaded deck fittings in the survey scope. Request rig history and demonstrate reefing from the helm with the crew who will use it.
Check access, movement and play on both sides. Demonstrate the emergency arrangement without assuming the fitted autopilot proves the underlying steering sound.
Walk through isolation and access for water, heads and electrical equipment. Ask which additions changed access or loading since delivery.
This guide is the class. A report is that hull. Paste the listing you're looking at and FairKeel grades every claim in it against what's known about the Lagoon 400 — where the evidence is thin, the red flags worth a second look, the costs likely to land in your first season, and whether the boat suits the plans you describe in a few short questions.
It won't read the photos or put a number on the boat — that's the $249 Deep-Dive, and for the real answer, a surveyor. It will tell you when a Deep-Dive isn't worth buying. Free, no account, usually a minute or two.
Run a free report on your listing →See something that doesn't look right? We'd love to know — email us about the Lagoon 400 →