Expert Review, Technical Specifications & Market Analysis
| Feature | Specifications |
|---|---|
| Overall Length | 78'2" (23.84 m) |
| Beam | 36'1" (11.00 m) |
| Draft | 6'4" (1.95 m) |
| Displacement | 135,937 lbs (61,660 kg) |
| Engines | Twin Volvo D4-175 (2 x 175 HP) |
| Fuel Capacity | 740 gal (2,800 L) |
| Water Capacity | 423 gal (1,600 L) |
| Cabins / Heads | 4-6 Cabins / 4-6 Heads + Crew |
| Max Speed | 11 knots (under power) |
| Cruise Speed | 9-10 knots (under sail/power) |
Source: Spec & Photos courtesy of Lagoon. Specs verified by Tony Smith, USCG 100 Ton Master, on August 18, 2026.
You want to actually sail - engines off, watch schedule, weeks at a time - with everyone you love aboard and nobody living in a corridor. The Lagoon Seventy 7 carries 3,609 sq ft of upwind sail area over 78'2", and gives the owner a private terrace over the water.
Part of the Lagoon Sailing Catamarans series — see how owners step up through the lineup.
The Seventy 7 is the boat that made me stop thinking of Lagoon as a production builder and start thinking of them as a yacht builder. VPLP drew it, Marc Van Peteghem talked publicly about designing it around how people actually live aboard rather than around a berth count, and you can feel that intention when you walk it. The owner's suite with its own private terrace is the moment most of my clients go quiet. It is not a cabin with a nice window. It is a separate apartment with its own piece of the sea.
The part I care about more, though, is the sail plan. Three thousand six hundred square feet upwind, and a real options list behind it - square-top main, staysail, Code 0, a big asymmetric. That matters because the failure mode of a large cruising catamaran is that it becomes a motorboat with sails on it. Properly specified, the Seventy 7 does not do that. She keeps moving in light air, which is where you spend most of your cruising life, and that changes the entire character of a season aboard.
Here is my honest counsel. Lagoon has moved the flagship role to the Eighty 2, and the Seventy 7 now sits in the Heritage line - which I read as an opportunity, not a warning. You are buying a proven, award-winning design with the bugs long since worked out, and you are buying it on the brokerage market where the specification of the individual boat is everything. Get me aboard the specific hull. I want to know which galley position it has, which sails came with it, and how the crew quarters were used. Get those three answers right and this is an extraordinary amount of yacht.
Video courtesy of Lagoon.
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Photos courtesy of Lagoon.
The Lagoon Seventy 7 is a sailing catamaran of 78'2" (23.84 m) overall with a 36'1" (11.00 m) beam, drawing 6'4" (1.95 m) and displacing 135,937 lbs (61,660 kg) unladen. Accommodation is 4-6 Cabins / 4-6 Heads + Crew, Lagoon rates her for eight to sixteen people aboard, and she carries CE Category A offshore certification for 14. Tankage is 740 gal (2,800 L) of fuel and 423 gal (1,600 L) of water.
She was drawn by VPLP Design with naval architect Marc Van Peteghem, and the brief was stated openly: cruising is a succession of moments spent with the people we love, so the architecture had to work for family, for friends and for charter, while also absorbing the crew a yacht this size requires. That is what the boat is organised around - long-distance cruising in which owner and captain can each live at their own pace, in complete privacy. She is a fully accomplished flagship, now part of Lagoon's Heritage line, which means a proven, award-winning design you can step aboard today rather than wait on a build slot for.
The Seventy 7 is a sailing catamaran first, and the rig is the specification that matters most. Standard upwind sail area is 335 m² (3,609 sq ft), built from a 130 m² (1,399 sq ft) genoa on a roller furler and the mainsail, and the options list is unusually deep for a cruising cat: a 207 m² (2,228 sq ft) square-top mainsail, a 75.67 m² (814 sq ft) staysail, a 208 m² (2,238 sq ft) Code 0, and a 448 m² (4,820 sq ft) asymmetric spinnaker. That wardrobe exists because a platform of this displacement needs genuine power in light air - properly specified, she keeps sailing in exactly the conditions where large cruising catamarans most often end up motoring.
Under power she carries Twin Volvo D4-175 (2 x 175 HP), for a maximum of 11 knots (under power) and a cruise of 9-10 knots (under sail/power). Those are auxiliaries by intent - harbours, calms and manoeuvring, not a substitute for the rig. Sail handling at this scale is crewed work: the flybridge helm gives a commanding view over the rig, but 3,609 sq ft of upwind area on a 78'2" hull is not a shorthanded proposition, and Lagoon designed separate crew accommodation in on the assumption that a professional captain is aboard.
The owner's suite is what people remember. Lagoon gave it a private terrace with open sea views, a large walk-in closet and a dedicated lounging area - a retreat with its own piece of the outdoors rather than a cabin with a good window. Guest cabins across the 4-6 Cabins / 4-6 Heads + Crew plan carry their own heads, and the crew accommodation is genuinely separate, which is what makes the privacy argument work in practice instead of only on the layout drawing.
Three galley positions are offered - galley up, forward and aft - and the choice changes the character of the boat: a forward galley keeps service out of the main social space, while an aft galley suits a crewed or charter programme. Lagoon describes the exterior and interior spaces as a single fluid layout, and that is how it reads aboard; you feel the full 36'1" (11.00 m) of beam and people move without negotiating around each other. The flybridge can be specified standard, with sun baths, with loose furniture for a deck you reconfigure, or with a jacuzzi.
Inside Lagoon's sailing range the Seventy 7 sits at the top, above the Sixty 5 and alongside the Eighty 2 that now carries the flagship title - which leaves the Seventy 7 as the fully realised large sailing Lagoon you can find already on the water rather than order into a queue. Against the cross-brand field she is measured on the Sunreef 80, the Privilège Serie 7 and the Catana 70, and her position within that group is specific: separate crew accommodation and four to six guest cabins on a 78'2" (23.84 m) hull, behind a sail wardrobe deep enough to make her a genuine sailing yacht rather than a motor yacht carrying a rig. She is a crewed boat by design, not a shorthanded one, and 36'1" (11.00 m) of beam sets the berth requirement accordingly.
Buy the Seventy 7 if you are planning in seasons rather than trips - a summer in the Mediterranean, a winter in the Caribbean - you want to sail rather than motor, and you intend to have a captain aboard. She rewards that owner more completely than almost anything else at this length. Be clear-eyed about two constraints: 36'1" (11.00 m) of beam needs an end tie, a T-head or a properly sized berth in most marinas, and 6'4" (1.95 m) of draft is comfortable across most cruising grounds but rules out the thinnest banks a shoal-draft power cat would walk over. If you want this scale without the rig and the crew load that comes with it, look at the Seventy 8 instead; if being the first owner of a brand-new hull at the top of the sailing range matters to you, that is the Eighty 2.
Yes. The Seventy 7 is a fully accomplished flagship — she was named sailing yacht of the year across several industry awards in 2017 — and she now sits in Lagoon's Heritage line. In practice that means you step aboard a finished yacht and inspect hulls already on the water, rather than waiting on a build slot.
Nothing about the design has been overtaken. She is 78'2" (23.84 m) overall on a 36'1" (11.00 m) beam, displaces 135,937 lbs (61,660 kg) unladen, is CE Category A certified for 14 people, and is configured 4-6 Cabins / 4-6 Heads + Crew. She was drawn by VPLP Design with naval architect Marc Van Peteghem. The Eighty 2 is the new hull for owners who want to be first; the Seventy 8 is the powered equivalent of this scale. Because you are buying a settled design, the survey of the individual boat — rig age, sail inventory, service history — matters more than any brochure comparison.
Standard upwind sail area is 335 m² (3,609 sq ft), made up of the mainsail and a 130 m² (1,399 sq ft) genoa on a roller furler. What sets her apart is the depth of the options list — unusual for a cruising catamaran, and the reason she keeps sailing in the light air where big cruising cats normally end up motoring.
Lagoon publishes a 207 m² (2,228 sq ft) square-top mainsail, a 75.67 m² (814 sq ft) staysail, a 208 m² (2,238 sq ft) Code 0 and a 448 m² (4,820 sq ft) asymmetric spinnaker as options. On a platform of this displacement that wardrobe is not decoration: light-air sails are the difference between a passage sailed and a passage motored. When you look at a specific boat, establish exactly which of them came with her and how old they are — a full, recent inventory is a meaningful part of what you are buying.
Realistically, no. She carries 335 m² (3,609 sq ft) of upwind sail area on a 78'2" (23.84 m) hull displacing 135,937 lbs (61,660 kg), and Lagoon designed dedicated crew accommodation into the boat on the assumption that a professional captain is aboard. Manoeuvring a 36'1" (11.00 m) beam in harbour is a two-person job at minimum.
That is a design decision rather than a shortcoming. The flybridge helm gives a commanding view over the rig, and the boat is organised so owner and captain can each live at their own pace in complete privacy — crew quarters are genuinely separate from the 4-6 Cabins / 4-6 Heads + Crew guest plan. Under power she has Twin Volvo D4-175 (2 x 175 HP) for a maximum of 11 knots (under power) and a cruise of 9-10 knots (under sail/power); those are auxiliaries for harbours, calms and manoeuvring, not a way to run the boat without sailing her.
