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Secure Shores, Solid Builds

From docks to barging, we build durable waterfront solutions designed to last. We’re your go-to team for dependable marine construction, backed by over 20 years of hands-on experience.

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Over 19 Happy Customers!

Your Go-to Marine Construction in Renton, WA, and Serving Seattle and All of Lake Washington

Based in Renton, WA, and serving Seattle and all of Lake Washington, Sea Anchor Marine Construction delivers top-quality marine construction with a personal touch. With over two decades of experience and hands-on service, we’re the friendly, licensed, & insured team waterfront homeowners trust. Built right. Every time.

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Experience Meets Precision on Every Job

We’re more than just contractors; we’re your neighbors, and we treat your project like it’s our own. With over two decades of experience and a hands-on approach, we show up ready to get it done right.

Our dedicated, trained crew delivers consistent quality without the confusion of a big corporate team. From start to finish, we keep things clear, friendly, and reliable. Whether you need a simple repair or a full dock build, you’ll get our full attention every time.

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Build Your Waterfront Vision with Our Services

As your trusted ​marine construction contractors, we offer a full range of services designed for waterfront homeowners. Our boat lift service includes reliable installation of aluminum elevator-style lifts, tailored to fit your vessel and protect it from wear.

We handle pile repair and driving, replacing rotted wood with durable metal piles or reinforcing existing ones with polymer systems. Our dock installation process includes a detailed site survey, help with permitting, and the use of high-quality materials to build long-lasting structures.

For those with aging or damaged docks, our dock repair restores stability and safety with targeted repairs or full replacements. We also provide barging services to deliver heavy materials directly to hard-to-reach waterfront properties.

From Lifts to Piles, We Handle It All

At Sea Anchor Marine Construction, we believe every waterfront project deserves dependable service and long-lasting results. We’ve built our reputation on being approachable, transparent, and hands-on. From custom dock building to boat lift service, our work is grounded in over 20 years of experience and a drive to do the job right.

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Boat lifts 

Install long-lasting protection for your watercraft with our tailored boat lift service. We provide complete assistance from selection to installation.

Boat lifts

Here’s what you can expect:

  • Custom boat lift sizing
  • Jet ski lift options
  • Aluminum elevator-style lifts
  • Dealer for Buster Lift
  • Full installation support
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Pile Repair & Driving

Strengthen your dock’s foundation with professional pile repair backed by modern materials and over 20 years of field experience in the industry.

Pile Repair & Driving

This is what awaits you:

  • Eot-resistant pile repair
  • Durable metal pile driving
  • Barge-accessible service areas
  • Epoxy-coated metal pipes
  • Polymer restoration system
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Dock Installation

Build a dock that lasts with our personalized dock installation, including permitting help, quality materials, and full project management.

Dock Installation

Here’s what’s included:

  • Free on-site surveys
  • Permit process coordination
  • Pressure-treated lumber frames
  • ThruFlow panel decking
  • Custom composite finishes
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Dock Repair

Revive aging or damaged docks with our full-service dock repair. Our team fixes wear and tear with durable materials and straightforward solutions.

Dock Repair

You can count on us with:

  • Pile integrity assessments
  • Specialized polymer repairs
  • Replacement with metal piles
  • Small and large repairs
  • Rot-resistant reinforcement
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Barging

Move heavy or bulky materials directly to your site with our efficient barge service. Our solutions are ideal for hard-to-reach waterfront properties.

Barging

With our services, you can expect:

  • 100k+ lb load capacity
  • 50-ton capacity crane
  • Waterfront construction delivery
  • Hot tub and equipment hauling
  • Landscaping material transport
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Elevate Your Marina with Quality Construction Work

Need reliable marine construction in Seattle or Lake Washington? Whether you’re replacing a dock, installing a boat lift, or need help transporting materials by barge, our Renton, WA-based team is ready to get started.

We bring years of experience, the right equipment, and a personal approach to every job. Contact Sea Anchor Marine Construction today to schedule a free estimate and see how we can help.

Why We’re the Right Choice

Quality You Can See, Service You Can Trust

Get Your Free Estimate on Our Services!

 Plan your lakefront project! No pressure, no hidden fees, just helpful service and clear quotes.

See Why Our Clients Trust Us

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Bob Visse

I recently had the privilege of working with Sea Anchor Marine Construction for a repair project on my dock on Lake Washington, and I can’t recommend them highly enough. From start to finish, their team delivered an exceptional experience, showcasing unparalleled craftsmanship, clear communication, and true professionalism.
The attention to detail from Sea Anchor Marine was extraordinary. Every aspect of the dock repair was meticulously planned and executed, from evaluating the structure to selecting and installing high-quality materials. Their craftsmanship is simply outstanding—each board was perfectly aligned, and every joint was seamlessly crafted, resulting in a dock that’s both robust and visually stunning. The fine details in their work reflect a level of skill and pride that truly sets them apart.
Communication with the team was impeccable. They kept me in the loop at every stage, providing clear timelines, promptly answering my questions, and offering expert recommendations to enhance the project. Their honesty was a breath of fresh air—there were no hidden costs or surprises, and they were upfront about every detail from the outset. This transparency made the process smooth and instilled complete confidence in their work.
Mario, the owner, is the driving force behind Sea Anchor Marine’s excellence. His commitment to perfection is unmatched—he personally oversaw every phase of the project, ensuring every element met his rigorous standards. Mario went above and beyond to ensure our satisfaction, offering creative solutions and checking in regularly to confirm we were thrilled with the progress. His passion for delivering a flawless result shines through in every aspect of the project.
The crew was not only highly skilled but also incredibly polite and respectful. They treated my property with the utmost care, keeping the work area spotless throughout the project. Tools were neatly organized, debris was cleared daily, and the site was left pristine after each workday. Their courteous demeanor made them a pleasure to have around, and their commitment to cleanliness elevated the entire experience.
Sea Anchor Marine Construction is a cut above the rest, combining exceptional craftsmanship, transparent communication, and a customer-first approach. Mario and his team transformed my dock on Lake Washington into something truly remarkable, exceeding our expectations in every way. If you’re looking for a marine construction company that delivers quality, honesty, and professionalism, Sea Anchor Marine is the one to call. They’ve earned my highest praise, and I’ll be reaching out to them for any new on water projects.

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Joe Victor

Mario and his Sea Anchor crew did an outstanding job for our project. Fast, efficient, responsive to any issues that appeared. Great communication during the project. Highly recommend!!!

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Neal Chalmers

Mario and team were great, they delivered what was promised on time. They worked with us to understand our options and got it done.

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Russell Horowitz

Let me start by simply stating that I cannot recommend Mario and Sea Anchor highly enough. They are completely trustworthy, honest and fair, and his entire crew are absolutely fantastic. They are highly skilled, have the highest level of professionalism, and are completely reliable. The quality of their work is absolutely outstanding and they have amazing attention to detail.
Over the decades we have worked with many contractors from numerous trades and Mario and his team are at the very top of the list of great experiences we have worked with, as well as with the quality and timeliness of work and project completion.
We enthusiastically give them our highest review and recommendation and anyone who works with them should feel fortunate there is someone so relaible who is accessible to them

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Warren Ashton

Mario and crew were prompt in starting the project, including picking up all materials, loading in the staging and getting work underway. They were diligent in getting the work done, sometimes in rough weather. They did on the fly troubleshooting and stayed on schedule throughout. The quality of work is good and we are super happy with the results. We will use them again I’m sure. Perhaps even for non-marine related work if it works out.

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Felix Wang

I got to know Mario, the owner, from my neighbor, who had good experience with Sea Anchor, so I decided to use them to rebuild my dock, it took them almost a month to complete the work, it is an excellent project, I am very happy to have this new dock, and very satisfied with Sea Anchor & Mario

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Ross Hartling

Beautiful dock work. On time, on budget. Very thorough evaluation and repair work. I would recommend Mario and his crew for any dock work and construction. Super nice to work with. Thank you, Mario!

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Anna Keller

Amazing work ! Absolutely recommend Mario and his team!

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Jenny Draper

Mario and his team at Sea Anchor Marine are perfectionists. Their bid for our project was extremely reasonable, they showed up on time and when they said they would. Worked hard and long days and left no debris behind. We are extremely pleased with the finished product. We will absolutely use them again!

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R K

Mario and his team have now completed two projects for me. The work has been excellent, on time and in both cases under budget. Do yourself a favor and at least get a quote from him, you’ll be shocked how much the established players are overcharging.

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Karen Overstreet

Mario and his crew fixed broken brackets and rollers on our saltwater dock. They were very prompt, efficient, cleaned up the work site and charged a very reasonable price. We highly recommend them.

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Maureen Chien

Sea Anchore is knowledgeable, professional, efficient and friendly. Mario and his crew installed a new dock ladder in 45 minutes. They did a beautiful work. As lakefront condo treasurer, I will highly recommend their work and hire them again and again.

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Building waterfront solutions together

Phone

Call now for dock & lift support

(425) 306-6182

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Contact Your Local Dock Builder​!

Need help with a dock, lift, or shoreline project? Fill out the form, and we’ll get back to you quickly to talk through your marine construction needs.

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    See Our Service Areas

    Take a look at the map to see where we work. From Lake Washington to nearby lakes across the Seattle area, we serve homeowners with waterfront access who need reliable marine construction.