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DIY Cruising Catamaran: Complete Building Guide

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A brand-new cruising catamaran can set you back a hefty amount of money. However, a DIY cruising catamaran provides a more affordable way to own your own boat. While building a large boat can be an extremely challenging and time-consuming experience, nothing beats the pleasure of bringing your own boat to life. 

To build a DIY cruising catamaran, buy good design plans, determine your budget and find a working space. Next, choose your hull material, buy supplies and start building the mast beam. Build and sheathe the hull, install bulkheads, the interior, and finally, launch the catamaran boat.

In this article, you will find a complete guide to building your own catamaran. You will also find detailed information on why you may want to consider building your catamaran and approximately how much this project would cost. Finally, we will explore the advantages and disadvantages of building a catamaran from scratch.

Why You Might Want To Build Your Own Catamaran

Most people might think that purchasing a used boat to repair and fix it up would be cheaper than a DIY cruising catamaran. But while building your own catamaran could be an enormous undertaking, it also comes with many advantages over buying something used. 

Other than the unique opportunity to create beautiful memories and experiences while cruising, sailing, and exploring beautiful coastlines, there are a number of benefits that come along with the DIY approach.  

Knowing Your Boat

Building your own catamaran provides you with intimate knowledge of your boat. You will know every corner, including where to find every bolt, wire, bulkhead, rib, hose, and support as you installed them yourself. This knowledge will enhance your confidence while at sea since you will have entrusted your life to a boat whose history you are aware of and deeply connected to.

Pride of Ownership

The satisfaction you get from crafting something with your own hands is immense. As a result, the knowledge that you built your boat from scratch will fill you with absolute pride and an immense sense of achievement. Furthermore, as an owner-builder, you get to keep and enjoy the boat for as many years as you wish.

Substantial Cost Savings

Building your catamaran will work out cheaper than buying a new or even gently used boat. Though you will likely require some additional labor since doing some things will require an extra pair of hands, if you are particularly good at DIY, you will save a significant amount of money on labor costs as a whole. 

Freedom To Create Your Own Designs

If you decide to buy a catamaran boat, it might not be easy to find one that meets your unique needs. However, instead of choosing from production boats that bear traditional and outdated designs, you can come up with an ultra-modern design or style for your catamaran. You also get to pick your layout, size, and equipment based on your taste and budget.

Great Learning Experience

Building your own boat will help you pick up numerous skills that will come in handy later when sailing your boat. As much as you might still require an expert to help you with specialized skills like carpentry or wiring, your new skills will serve you well. This will also be beneficial when it comes to your boat’s maintenance and fixing things for yourself. 

What To Look For in Catamaran Boat Designs

When deciding on the type of catamaran boat to build, you may want to choose a design that’s simple and easy to build. This is because doing so will allow you to spend a shorter time building the boat. 

You also need to have a set of requirements to guide you in choosing your design or what you might call an ideal cruising catamaran wish list. This is essential because, ultimately, you want to build a boat that offers outstanding qualities such as:

  • Delivers good speed
  • Affordable to own and operate
  • Agile, strong, and easy to maintain
  • Has a high resistance to capsizing
  • Great for sailing and cruising
  • Delivers a comfortable and easy motion underway
  • Good handling ability and high performance under sail
  • User-friendly embarking and disembarking
  • Provides ample living and accommodation space 
  • Presents a reasonable resale value

It’s worth noting that, in general, catamaran boats tend to offer a fair resale value mainly because of scarcity and the high price accorded to production models. So, if you build a well-constructed catamaran, you are bound to get a return that’s much higher than the cost of materials upon resale.

It’s also good to consider whether the design you settle on is from an established designer. This is significant because documentation of the building process is just as valuable when it comes to selling the boat.

How Much Would It Cost To Build Your Own Catamaran?

The cost of building your cruising catamaran will depend heavily on the size of the boat you plan to build and the skills you bring to the table. To give you an idea of probable costs, a professionally built 40 foot (12.1 m) long cruising catamaran could go for up to $300,000. 

Though building it yourself will undoubtedly be cheaper, most DIY boatbuilders tend to underestimate the expected costs. Your final costs should cover not only the cost of material and equipment but also the labor and time it would take to come up with the final product. 

If you were to build a 40-foot (12.1-meter) catamaran, your cost of materials would range between 20-30% of the total cost. Therefore, for $300,000 total, the boat’s materials would range between $60,000 and $90,000. The hull tends to range between 15-35% of the total build. Again, this depends on the finish and furniture.

But before you even start working on the DIY project, you will need to figure out where to do the work. If your home has ample space, then you can opt for a backyard building. But if you live in a small apartment, then you might want to consider renting a small garage at first and then move on to a boatyard later. This is one of the significant costs involved in building your multi-haul.  

What You Will Need

To get a clearer picture of how much the entire project would cost, let’s have a look at what else you will need to purchase.

  • Good design plans
  • Working space
  • Ground tackle
  • Matting and roving
  • Equipment such as the engine, windows, rudders, deck fittings, mast, and rigging

In addition to the above, you also need to install plumbing and electricals. You may also want to consider going electric rather than using diesel. Not only will this drastically reduce your maintenance costs, but you get to use the regenerated power for all of your housing needs while sailing. 

Some catamaran boat designs help you save costs by advocating the use of less expensive corpus materials. Most of the material goes directly into making the boat, which means there is hardly any wastage on vacuum bagging . With this method, there are few molds and temporal building forms and fewer fillers to grind off as waste. All these factors reduce the time and cost it takes to build your catamaran boat.

That said, building a boat of any kind is a huge financial undertaking. As such, you still need to have the financial ability to keep building; otherwise, your project will stall or take much longer than anticipated. Instead of enjoying yourself and making memories cruising to faraway lands, you might end up spending all your time building a seemingly never-ending boat.

To reiterate, this project is more of a labor of love, given that it involves a tremendous amount of manual work. Calculating an hourly rate on the time spent building the boat and adding this cost to that of materials may make it seem a very pricey exercise. However, it is vital to understand that your time matters, and every hour you spend working for “free” should be included. 

With that in mind, you need to ensure that you are fully devoted to the boat construction project and are sure you want to do it before you begin. Stopping halfway because it seems like too much work would be incredibly costly.

How To Build a Catamaran

When it comes to building a cruising catamaran, you have 3 main options:

  • You can buy an old boat and refurbish it.
  • Purchase a bare hull plus deck molding for a home-boat building.
  • Start from scratch and build everything, including the hull, on your own. 

As mentioned above, renovating an existing boat may end up being more costly than starting from scratch. To build a catamaran boat from scratch, follow the below step-by-step guide.

Prepare the Essentials

Before you jump into such a large project, there are several important aspects to consider:

  • Buy your plans from an established catamaran designer. You can also get inexpensive, easy-to-build catamaran designs online.
  • Get access to a large working space or build a shed . Depending on your climate, you may need to opt for climate control to avoid an excess of moisture in humid areas. 
  • Decide on your choice of hull material. This could be fiberglass, aluminum, steel, wood, or ferroconcrete. 
  • Start working on a bill of materials estimate. Include everything that you think you need to get a better idea of the initial costs.

Build the Mast Beam

Using wood and epoxy, cut and glue together the pieces of wood that will form the mast beam. Most of the work at this stage can occur in a garage since it involves building small parts. Still, the work could take up to 4 months, so be prepared to put in long hours.

Build the Boat Hull

Now, it’s time to build the boat’s hull. A catamaran comprises two hulls which are connected with a deck. Below is a short video showing how to build a hull mold:

This work requires a larger facility, so you might need to move out of the garage and into a boatyard. If you don’t have access to a larger workshop, consider building a shed where you can work as you do the construction. Make sure there’s enough room to fit the boat and also allow you to work comfortably. To cover the shed, you can use opaque white tarps. 

Sheathe the Hull

Get all the materials you require for this stage in the construction, such as lots of resin, fiberglass, and foam for use in the hull cores. You’ll also require matting and glass roving to sheath the hull . 

Sheathing helps to make the hull impervious to water and other marine borers. But first, you need to prepare the hull using a rotary sander. To make it as smooth as possible, use light, sweeping strokes. This is a very dusty task so be prepared to wear a facemask and safety goggles. 

Install the Bulkheads

Next is installing the plywood bulkheads . You might need to call in friends to help turn the hulls or use a crane. In this step, you will need to laminate the hull sides on the molded hull panels and bond them above the bulkheads. Ensure the bulkheads are snug and sealed in place.

Construct the Interior Structure

Over the next couple of months, the boat work will involve joining the hulls together with the beams that you had made back in the garage. Then, install the cuddy cabin, decks , and the cockpit . Soon the boat will start to take the shape of a catamaran.

Next, proceed to construct the major structural components such as stairs, hatches, mini-keels, and the interior. Then comes the work of fairing the boat, which is quite labor-intensive. 

Finally, it’s time to apply primer on the catamaran boat and start the paintwork. Before painting the boat, you will need to do additional sanding to finish off the two layers of primer as well as fill all the pinholes. Since it’s a large boat, the catamaran has lots of surface area; thus, the sanding could get extremely exhausting—mentally and physically—at this point.

The painting can take a while, too. The hulls are the easiest to paint, but the topsides, non-skid, as well as masking and prepping could seem never-ending. 

The final stretch involves working on the center bridge deck cabin and other final touches like installing the engines, electricals, and plumbing. This is also the time to fix the rudders, rigging, mast, windows, and deck fittings.

Launch Your Cruising Catamaran

After many months or years of hard work, your cruising catamaran is finally ready to test the waters. After lowering the boat into the water, check carefully in case there are leaks. If none, you can set up the sails and take your catamaran out for your first cruise. 

Below is a short video that takes you through the entire boat-building process:

If you don’t have deep pockets, don’t despair. It’s also possible to build an inexpensive catamaran boat, as shown in this post from the coastal passage .

The Pros of Building a Catamaran

Though it will be a costly endeavor, there are so many things to look forward to should you decide to build your own catamaran:

  • It can be lots of fun.
  • You get to have a new boat.
  • It’s an excellent hobby for DIY enthusiasts.
  • The effort is rewarding.
  • It offers a great learning experience.
  • You get the exact kind of boat you want.
  • You can alter building plans and tailor the boat to suit your specific needs.
  • It might be cheaper than buying a new boat.

The Cons of Building a Catamaran

Though there are a number of positive aspects to a DIY build, it is just as important to keep in mind that it won’t always be easy:

  • Maintenance costs can be quite high.
  • It’s both mentally and physically exhausting.
  • It might require some technical know-how.
  • It can take many months or even years to complete.
  • It requires a lot of commitment to finish the DIY project.
  • It might be challenging as well as expensive to get insurance.  
  • You will spend almost all your free time building the boat. 

DIY Cruising Catamaran Tips and Tricks

If you are new to boat building, it would be a good idea to build a small boat first. This would give you a good indication as to whether you’d enjoy tackling a more extensive project like building a catamaran. Again, if you are the handy type, fixing your own electronics could also save you a significant amount of money. 

Here are more tips and tricks to get the most out of your DIY cruising catamaran:

  • Lower your costs. Bring down your costs even further by sourcing for parts and supplies at marine surplus outlets, Craigslist, eBay, or wholesale suppliers. 
  • Enhance your resale value. Most home-built boats are not easy to sell since they tend to be too customized. To enhance your resale value, it’s advisable to work with a standard design from a well-established naval architect.
  • Follow the design instructions. Make sure to follow the designer’s instructions regarding the type of materials and tools to use during the build to avoid making costly mistakes.
  • Maintain your original budget. Avoid any additional customizations once you have started building the boat. Using good plans and sticking to them ensures that your budget doesn’t spiral out of control.

Final Thoughts

Building a catamaran is about more than saving money. It’s fun, exciting, fulfilling, and can be a great learning experience. While it might take many months of back-breaking work, comparative shopping and sourcing for materials will help you save a lot of money. Still, at the end of it all, you’ll have a beautiful catamaran boat, all ready for your first cruising adventure.

However, if you have neither the time nor the energy to build your own catamaran from scratch, refurbishing an existing hull might prove faster and easier. It also works out much cheaper than buying a new boat.

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

One thought on “ DIY Cruising Catamaran: Complete Building Guide ”

Hello, I am a French Quebecer who is original, imaginative, creative and who finds that all boats and catamarans have a huge flaw and a very big lack of logic. I would have a brand new concept…. I am sending this message to any catamaran creator – designer to make those who have the opportunity and the intelligence to want to know about my innovative idea which will finally upset the market much richer. An idea that will totally change the concept of sailing, navigation and save so much worry!! All I would ask for is a small percentage of each sale of the new product. To be able to make me produce one when I have enough!! It is certain that like that, you just want to tell me: come on Mr. Lessard give us your idea but do not take your word to help me in return! But, if you are the kind of man to have only one word and maybe have a proof of your good faith if the realization of the project would make it… I will be very happy!! Giving it to everyone wouldn’t bother me either…. all I would like is to be able to find flax fiber (too expensive carbon) to be able to try to make my catamaran myself. Because not rich! Have a nice day and looking forward to having a message!!

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Sharpie Cat 42

The Sharpie Cat 42 is a new catamaran design from a regular WoodenBoat contributor, author and marine architect Reuel B. Parker. She is a fast cruising cat with accommodations for eight in four cabins. Construction is cold-molded wood/epoxy, with foam core bulkheads, cabins/roofs, and she features a Parker “L-Head” rotating wing mast. Fuel: 120g; Water: 200g; Payload: 1,500 lbs. Mast height is 52′. Deck clearance minimum (laden) is 1′ 8″. Average headroom is 6′ 1″. She can also be built as a powercat. She has sheathed daggerboards and kick-up rudders.

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  • Coral Sea 25

Coral Sea 25 by Mike Waller Yacht Design

25 ft plywood 'v' hull low cost cruising catamaran.

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URL: http://wallerdesign.com.au/cs25.html

Description:

The CORAL SEA 25 CATAMARAN is designed specifically for the builder who wants the maximum boat for minimum cost and building time. To this end the vessel features seperate hulls connected by strongly mounted cross beams.

The vessel is demountable for trailing and employs a simple, easily built, trunkated 'V' hull shape. The trunkated 'V', is as simple to build as the straight 'V', but has better sailing characteristics, such as less wetted surface, better tacking etc. This yacht is definitely a case of the most boat for the least work and cost.

The Coral Sea 25 is designed for safe, comfortable family sailing, with bunks for 4 in 2 seperate hulls. It also has a room for a portable toilet, small cabin lockers, and a huge cockpit for socializing. There is good sitting headroom in the hulls.

For simplicity and ease of construction the hulls consist of a plywood shell wrapped around a framework of plywood bulkheads and timber stringers. This is still the easiest way to construct a timber boat, and when combined with timber / epoxy construction, is a very cost effective way to build a sound vessel.

The rig is a simple but efficient ¾ sloop, with a large sail area for light weather cruising, easily reefed in heavier winds. The rigidly mounted beams allow the vessel to carry an efficent rig which can stand up to the weather. The rigging is as simple as possible, and is based on the KISS principle. Two separate rigs are available, a standard rig for offshore and open water sailing, and a larger inshore rig. The choice is at the builders discretion.

Auxiliary power is from an outboard in a separate pod beneath the cockpit footwell. The vessel features small skeg keels for cruising simplicity, and efficient transom hung rudders for positive helm control. Steering as designed is by tiller. The Coral Sea 25 is an easily constructed vessel capable of providing it's owners with years of comfortable and fun cruising, or even ocean voyages for the more skillful and adventurous sailors.

Coral Sea 25

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hu'chu recycles aluminum scrap and discarded license plates into a 55-foot sailing catamaran

Hu’chu 55 from aluminum scrap and discarded license plates.

Hu’chu GmbH has introduced Hu’chu 55, a sailing catamaran owned by Daniel Roesner. The German actor, producer, and environmental entrepreneur isn’t only the proprietor. He was also the one who produced the 90 percent aluminum scraps repurposed for Hu’chu 55, tapping a major manufacturer along the way for the discarded objects. He recycled aluminum scrap, discarded license plates, road signs, cosmetic cans, as well as automotive and construction remains into his sailing catamaran , collaborating with iYacht GmbH along the way for the design.

Daniel Roesner himself picked the materials to be applied to his water vehicle. He ended up incorporating natural fibers, reclaimed wood, and recycled cork since he wanted to give them a second life. Metal wraps the exterior of Hu’Chu 55, and its rugged aesthetics may give off the vibe of an explorer catamaran. The latter may ring true, amplified by the shades of brown and black that color the interior of the water vehicle. iYacht’s design offices in Hamburg and Kiel worked closely with the owner to make sure he received what he pictured as his sailing catamaran.

iYacht GmbH builds a workspace for Daniel Roesner

When it comes to Hu’Chu 55’s rig and sail system, iYacht GmbH makes sure they’re easy to control from both the steering area and the rear of the boat. The yacht design and engineering studio placed three front sails for the sailing catamaran, including a self-adjusting one and a couple of others that can handle different wind conditions. There are boards on the bottom to help the water vehicle sail better against the wind, and the design team moved the mast further back to make the front sails larger.

The sailing catamaran comes with two electric motors that can help move it when needed, running quietly and free from vibration. The water vehicle has large batteries that can be recharged by solar panels or by the movement of the boat. In this way, the propellers spin and generate electricity when the boat moves, which then recharges the batteries. The solar panels on the boat not only create electricity but are also connected to a water heating system that keeps them cool. The sailing catamaran uses renewable energy to grow vegetables, clean water, and power all its equipment, including a room where Daniel Roesner works on editing films.

Sailing catamaran hu’chu 55 as a permanent home

iYacht GmbH designed Hu’Chu 55 in a way that Daniel Roesner can live there permanently on board, which is what he has in mind. To carry this out, the design team included a film area for him to work in, dry storage for protecting electronics and special equipment, and two garages for diving and sports equipment. All of these are tailored to Daniel Roesner’s needs, who plans to produce documentaries about the oceans as well as monitor the water quality. There’s even a boat garden in the middle of the sailing catamaran. Here, the owner can cultivate his own fresh food, regardless of his location, through the vertical hydroponic gardens.

‘After living four years on a steel cutter to test whether life on the water was for me, I quickly realized that it was my thing and that all I really wanted to do was make films and live on the sea,’ says Daniel Roesner. ‘I have a large circle of friends consisting of divers, free divers, scientists, and underwater filmmakers. I would like to collaborate with them to implement various projects on topics such as environmental protection, research, and adventure, and also hope to work with various universities. The boat is going to be a platform for sustainable research, adventure, film, and circular living. Hopefully, the Hu’chu 55 will be an inspiration to others as well.’

project info:

name: Hu’Chu 55

engineering: iYacht GmbH | @iyacht.gmbh

client: Daniel Roesner | @danyroesner

catamaran: Hu’chu GmbH | @huchusail

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News | Walter Hoffman, surf industry pioneer and…

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News | Walter Hoffman, surf industry pioneer and big-wave surfer, dies at 92

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“Surfing has lost one of its true pioneers as Walter Hoffman has gracefully kicked out. A surfboard builder, big-wave innovator, titan of the surf industry and committed family man, his legacy will live on in countless ways,” wrote Jake Howard, editor-in-chief of Surfer Magazine, in a tribute following news of Hoffman’s passing.  

Hoffman and brother Phillip, who went by “Flippy,” spent their younger years in the Los Angeles area, sons of Rube Hoffman, who started California Fabrics in 1924.

By the ’40s, the family was spending summers in Laguna Beach, where the teenage brothers enjoyed the laid-back beach lifestyle – surfing big redwood boards, diving for abalone and having bonfires on the sand after long, cold ocean sessions, before the days of wetsuits.

Dick Metz, a longtime friend and founder of the Surfing Heritage & Culture Center, first met the Hoffmans during those years when he was a lifeguard for Laguna Beach.

Walter Hoffman joined the Navy during the Korean War and because of his water skills, was sent to Hawaii to be a lifeguard at Pearl Harbor, Metz said.

That’s where a group of surfers, including Hoffman and the likes of Buzzy Trent and George Downing, lived together, spending summers in Waikiki and winters on the North Shore, becoming pioneers of big-wave surfing.

“There weren’t shapers like now, there weren’t shops,” Metz said. “Everybody would make their own board or if you didn’t like doing it, you’d get a guy like Walter to.”

Hoffman was one of the early-era board makers, using balsa wood and other materials, long before fiberglass and foam were introduced to the craft. In 2021, Hoffman was inducted into the International Surfboard Builders Hall of Fame in Huntington Beach for his early boards that helped pave the path for big-wave surfing.

Hoffman and brother Flippy were also  inducted into the Surfing Walk of Fame in 2006 for their contribution to the surf culture — namely their impact on surfwear.

Following his time in Hawaii, Hoffman learned the fabric business and bought a home on Beach Road in Dana Point in the ’50s. The brothers took the train from San Juan Capistrano to Los Angeles to help, and eventually take over, the family operations.

It was a time when surf innovation was thriving, with regular gatherings of the era’s innovators meeting every Wednesday at the empty lot next to Hoffman’s beachfront home, kicking around ideas after long days surfing — what emerged were creations such as Hobie Alter’s small sailing catamaran and the foam blanks for making surfboards.

The group, dubbed the “Dana Point Mafia,” revolutionized surf culture into what we know today, Metz said.

“All of that happened on the beach. Go surf, have a beer and talk about foam surfboards, all of that,” he said. “Walter was an integral part of that for 60, 70 years.”

Their father’s company, later renamed Hoffman California Fabrics, International, was already a big player in the textile industry, but his sons, with a love for the Hawaiian islands and surfing, would bring “their own special vision and talents” to the company.

Hoffman California Fabrics pioneered the Hawaiian-infused aesthetic of California surf clothing and became the primary textile provider to the surf wear industry, supplying big brands such as Ocean Pacific, Quiksilver, Gotcha, Billabong and O’Neill.

Iconic Dana Point surfer Walter Hoffman with Gerry Lopez on June 21, 2024, during a gathering at Rainbow Sandals in San Clemente. (Photo by Laylan Connelly/SCNG)

“No one had a better life than Walter, his life was in the best of times to be a surfer and he lived every moment of it to the fullest,” said iconic surfer and longtime friend Gerry Lopez. “I’m sure he passed with a smile for all the good waves, good friends and good times he enjoyed.”

Hoffman was also the patriarch of a family tree of surf influencers, including raising step-daughter Joyce Hoffman, a champion women’s surfer who broke barriers in the ’70s , and as grandfather to Christian and Nathan Fletcher, two well-known fixtures in the surf world.

Plans were already in the works for a statue honoring Walter and Flippy Hoffman, who died in 2010, to join Joyce Hoffman’s bronze statue at the Waterman’s Plaza, where a collection of Dana Point icons are honored for their early-era contributions.

Hoffman is survived by children Joyce Hoffman, Dibi Fletcher, Tony Hoffman, Robin Hoffman Haack, their spouses, seven grandchildren and 11 grandchildren. Plans for a memorial are pending.

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