Ask a room full of Caribbean cruisers what size catamaran they would buy again and a surprising number land within a couple of feet of 45. Builders know it, which is why the Leopard 45, the Lagoon 450 and the Fountaine Pajot Elba 45 have all been central models in their ranges. Charter companies know it too, and their fleets turn over into the brokerage market every few years.

This guide sets out what you actually get at 45 feet: the dimensions, the cabin layouts, the yards that can lift one, what new and used boats sell for, and how the size compares with 40 and 50 feet. Every specification below comes from a published source so you can check it before you shortlist a boat.

The three best known 45-foot cruising catamarans are closer in size than their marketing suggests. The Leopard 45 specification sheet lists a 45 ft hull, a 24 ft 2 in beam, a 4 ft 11 in draft and a displacement of 32,849 lb, from a Simonis Voogd design built by Robertson and Caine in South Africa. The Lagoon 450 model data gives 13.96 m (45 ft 10 in) overall, a 7.87 m (25 ft 10 in) beam and a 1.30 m (4 ft 3 in) draft. The Fountaine Pajot Elba 45 figures show 13.45 m (44 ft 1 in), a 7.55 m (24 ft 10 in) beam, a 1.2 m (3 ft 11 in) draft and about 14 tonnes unloaded.

Read across the table and a pattern appears. Beam sits between 24 and 26 feet, draft between roughly 4 and 5 feet, and weight between 14 and 15 tonnes. Those numbers drive almost every practical question an owner faces, from which anchorages you can reach to what a marina charges you. How each builder shapes the hulls and the space between them matters as much as the headline length, and our explainer on bridgedeck and daggerboard design covers what those differences mean once you are at sea.

The Caribbean rewards a boat that handles steady trade winds of 15 to 25 knots, short open crossings between islands and long stretches at anchor. A 45-footer sits in the middle of that brief. It has enough waterline to carry a full cruising load of water, fuel, dinghy and provisions without dragging its transoms, and enough hull length to ride the short, steep seas of channels like the Anegada Passage more comfortably than a 38 or 40.

At the same time, the loads stay human. Sail areas, anchor weights and winch loads on a 45 are within what a fit couple can manage with electric winches and good technique. Push to 50 feet and beyond and many owners start to rely on powered everything, a larger crew or a paid captain for deliveries. Our piece on the reasons owners love catamarans explains why stability and living space draw buyers to two hulls in the first place; 45 feet is where those benefits arrive without the big-boat overheads.

Most buyers do not agonise over whether to buy a catamaran; they agonise over how big. The jump from 40 to 45 feet usually adds a usable fourth cabin or a far larger owner’s suite, more tankage and noticeably better motion in a seaway. The jump from 45 to 50 adds more of the same, but the bills scale too: dockage, haul-outs, antifouling, insurance and rigging replacement are all priced by length, beam or value.

The 45-foot band sits between those columns. For a couple who host family a few weeks a year, it is usually the most boat you can still run alone. For a family of four or five living aboard, it is often the smallest size that gives everyone their own cabin. Our guide to the best catamarans for liveaboard life compares specific models if you are choosing on comfort rather than on length alone.

Beam, not length, is what limits a catamaran in a marina or boatyard. With 24 to 26 feet of beam, a 45-footer usually needs an end tie or a double-width slip, and some marinas charge multihulls a premium over monohulls of the same length. Before you buy, compare the dockage rates by length in the islands you plan to base the boat, because the difference between a mooring and a marina berth can exceed the annual insurance premium.

Draft is the good news. At roughly 4 to 5 feet, a 45-foot catamaran reaches anchorages that turn deeper monohulls away, and it can tuck close to shore in places like the North Sound of Virgin Gorda or the shallow bays of Anegada with careful navigation. Fixed keels also let most of these boats take the ground on a beach or a careening grid in an emergency, something few monohulls of the same length can do safely.

Haul-out capacity is the constraint new owners forget. A standard travel lift is too narrow for a 25-foot beam, so you need a wide-body machine. In Tortola, the Nanny Cay boatyard runs a wide-body 70-tonne Travelift rated for catamarans up to 32 feet of beam and 70 tons, which handles every 45-footer in the table above with room to spare. Ask any yard you plan to use for its lift width and its multihull storage space before the boat needs bottom paint or hurricane storage.

Every model in this size is sold in at least two layouts. The owner’s version gives one entire hull to a master cabin, usually with a large head and shower forward, a desk or settee midships and plenty of storage, and splits the other hull into two guest cabins. The four-cabin version puts a double cabin at each corner of the boat, each with its own head, which is what charter companies order because it lets them sell the boat to four couples.

That difference matters most when you buy ex-charter. Most used 45-footers on the Caribbean market came out of a fleet, so the four-cabin layout is the one you will see most often. It is not a bad boat to own: four heads make life easy with guests, and the extra cabin can become a workshop or storage room. But a three-cabin owner’s version usually commands a premium at resale among private buyers, and a four-cabin boat that has run several charter seasons needs a thorough survey of its heads, pumps, air conditioning and soft furnishings.

If you are thinking about the other direction, buying a new or nearly new boat and placing it in a fleet to offset costs, read our guide to charter-managed yacht ownership first. The four-cabin layout is almost always the condition of entry, and the management contract decides how much time you can actually spend aboard.

New boats in this size are priced in euros at the factory and climb quickly with options. The Elba 45 base price listed by The Catamaran Gurus starts at around 686,700 euros, before electronics, a generator, watermaker, solar and the shipping or delivery that a Caribbean buyer needs. Fully equipped, a new 45-foot catamaran commonly lands well above the base figure once it is commissioned in the islands.

Used prices spread widely by age, layout and charter history. Yachting Address puts recent used Lagoon 450s at roughly 450,000 to 700,000 euros, with older Lagoon 440s and early Leopard 4-series boats below that range. For a fuller breakdown of new, used and ex-charter prices across all sizes, and how condition shifts value within a single model, see our catamaran cost guide.

Purchase price is only the start. Budget each year for insurance, which in the Caribbean is shaped by named-storm cover, plus dockage or moorings, a haul-out with antifouling every one to two years, and engine and saildrive servicing on two of everything. Standing rigging is commonly replaced every 10 to 15 years, and sails and trampolines wear faster under tropical sun. Factor those into your offer, not just the asking price.

When you are ready to compare real boats, start with the yachts for sale in the Caribbean and filter by length. Because BVI Yacht Sales works on a co-brokerage basis, a broker can also show you suitable 45-footers listed by other firms, so your shortlist is not limited to one office’s listings.