A catamaran tender is a twin-hulled platform that trades the speed and ride of a deep-vee monohull for deck area, stability at rest, and shallow draft. The format is uncommon as a primary guest tender but earns its place as a watersports platform, dive boat, or beach-day boat where guests want to spend the day on the water rather than transit between two points.
This page covers what catamaran tenders do well, what they do poorly, and where they fit in a multi-tender programme.
What a catamaran tender does differently
Three structural advantages drive the format:
- Deck area for length. A 9m catamaran typically has 25 to 35 percent more usable deck area than a 9m monohull, because the bridgedeck spans the gap between the hulls and the deck reaches to the gunwale on both sides without the tumblehome of a monohull.
- Stability at rest. Catamarans roll little at anchor or drifting. For a dive operation, a fishing platform, or a long lunch on the water, this matters more than top speed.
- Shallow draft and even-keel beaching. Twin shallow hulls dry out level on a sandbar, useful in the Bahamas, Maldives, French Polynesia, and other shoal cruising grounds.
The trade-offs are real. Catamarans slam in head sea, the bridgedeck clearance has to be high enough to avoid wave impact, and the boat is wider than a monohull of equivalent length. The wider beam often pushes a catamaran tender out of the garage, so most catamaran tenders live on deck or on davits, not in the garage.
Where the format earns its keep
The realistic use cases:
- Watersports platform, where guests dive, snorkel, kite, or wakeboard from the same hull all day. The deck area and the stability at rest are the point.
- Dive operation, where two divers can kit up on opposite sides of the boat without stepping over each other, and the swim platforms are at water level for entry and exit.
- Sport-fishing day boat, in the Bahamas and Caribbean, where a catamaran with twin or quad outboards combines fishing-platform stability with the speed to reach the fishing grounds.
- Beach-day shuttle to shoal anchorages, where the boat carries a dozen guests, a paddleboard, two coolboxes, and a barbecue, and dries out level on the sand at low tide.
For owner transport, a catamaran is rarely the right answer. Use a limousine tender or open guest tender instead.
Sizes and propulsion
The mainstream:
- 8 to 10m, twin-outboard, often with a centre-console helm. Eight to twelve guests, day-only. Build cost 250,000 to 700,000 EUR.
- 10 to 12m, twin-outboard or twin-sterndrive, more deck and a small enclosed head. Twelve to sixteen guests, day-only. Build cost 700,000 to 1,500,000 EUR.
- 12 to 15m, often with a small dayhead and shaded saloon, twin sterndrive or waterjet. Fourteen to twenty guests. Build cost 1,500,000 to 3,500,000 EUR.
Above 15m the boat is no longer a tender, it is a small catamaran day-boat in its own right and lives at a marina rather than in a garage.
Builders
The catamaran-tender market is more fragmented than the limo or open market. Names that come up:
- Aquila Power Catamarans, US-flag friendly, semi-custom in the 8 to 14m range
- Sunreef Yachts, Polish builder of larger sailing and power cats, with a tender-scale division
- World Cat, Carolina-built fishing-cat platforms, popular in the Bahamas
- Iguana for amphibious twin-hull beachlanders
- Custom yards (Pascoe, Hodgdon, Tenderworks) on a build-to-spec basis
Most catamaran tenders end up custom or heavily modified semi-custom because the use case is specific to the programme. The build cycle is similar to a monohull at 18 to 30 months for custom and 9 to 14 months for semi-custom.
Garage and stowage
A 10m catamaran typically runs 4.0 to 4.5m beam, against 3.0 to 3.2m for a 10m monohull. A garage door wide enough for a catamaran is the exception, not the rule. The practical answer is one of:
- Deck stowage on cradles, with launch and recovery by a dedicated deck crane
- Davit stowage on the aft deck or transom, for boats up to 8m
- Dedicated catamaran garage on a custom yacht with the asset specified into the build from concept
We see all three. The third is rare and only viable on a new-build over 70m where the catamaran is part of the original brief. See tender garage sizing for the geometry.
Performance and ride
Catamarans cruise at 22 to 32 knots, top out at 30 to 45. They are slower than equivalent monohulls and consume more fuel at high speed. In flat water the ride is excellent. In short head sea the ride is unpleasant, with bridgedeck slam dominant once the wave height passes the bridgedeck clearance. Most catamaran tenders are coastal day-boats and the spec should reflect that.
Specification questions worth asking
- What is the bridgedeck clearance, measured at half load, and at what wave height does the bridgedeck start to slam?
- What is the beam against the garage opening, and if the boat is deck-stowed, what is the cradle footprint and the lift weight at full tank?
- What is the deck-load rating in the watersports area, and where are the toy tie-down points?
- What is the head capacity, and is it black-water rated for marine reserves?
- What is the freshwater tankage and the rinse-down provision, given the boat will spend most of its day at anchor with watersports running?
Where to go next
For the comparison to other tender categories, open guest tenders, beachlanders, sport tenders, and RIB tenders. For the broader picture, tenders pillar. For the watersports-driven chase boat alternative, see the chase-boats library. To discuss a specific spec, get in touch.