A white yacht in front of a beautiful waterfall

Boat Modifications in Seattle, WA

At Pacific Fiberglass, our Boat Modifications service line combines engineering precision, advanced composites, and aesthetic integration to deliver custom upgrades that enhance both function and style. Whether you’re looking to add a thruster, extend a swim platform, or make other innovative modifications to your vessel, we approach each project as a bespoke design challenge.

Pacific Fiberglass | Boat Modifications
Pacific Fiberglass | Boat Modifications
Pacific Fiberglass | Boat Modifications
Pacific Fiberglass | Boat Modifications
Pacific Fiberglass | Boat Modifications

Our Specialty Upgrades

Our services include specialty upgrades designed for boat owners who want greater control at the dock and enhanced functionality on the water. Each project begins with a careful evaluation of your hull structure, available space, and the intended use of the upgrade. From structural reinforcement to clean finishes that match your boat’s existing lines, we focus on strength, watertight integrity, and a seamless look that performs as well as it appears.

Thruster Installations (Bow, Stern & Retractable)

Installing bow or stern thrusters is one of our signature modifications. We work with tunnel-type, retractable, or externally mounted systems and carefully integrate them into your hull. Our engineers determine proper tunnel placement, reinforce the surrounding laminate and core structure, design move-in fairings, and bond flanges or housings with precision. For retractable thrusters, we ensure watertight deployment systems, drive gear integration, and appropriate housing transitions.

Swim Platform Extensions & Custom Platforms

Need more deck space or easier water access? We can design and install glass-reinforced swim platforms that match your boat’s lines. From shaping foam or composite cores to lamination, gelcoat finishing, and load testing, we ensure your platform is sturdy, hydrodynamically sleek, and fully bonded to the existing structure.

Structural & Aesthetic Modifications

Beyond thrusters and platforms, we support a wide range of modifications:

Each modification is engineered to maintain or enhance structural integrity, resist fatigue loads, and avoid introducing stress concentrators.

Client Testimonials

“Kudos to Doug and his team for doing an amazing job! We had only scheduled Pacific Fiberglass to check the rudders, as we were planning on doing the rest of the work ourselves. After hauling out and realizing it was a bigger project than we could handle, they gave us a very reasonable quote, jumped on the job and we were out of the boatyard in 6 days! Amazing work! Thanks to your team!”

Scott Helfen

Client Testimonials

“I brought my sailboat in to Pacific Fiberglass for structural hull and stringer repair after a hard grounding and the work they completed was top-notch. They did all the coordination with Canal Boatyard for travel lift work and kept in good communication with me through the entire process, staying on schedule and on budget. My boat went back into the water better than ever and I couldn’t be happier. It’s nice to see a small business such as this be able to stay in business in Seattle. They would be my first choice for any future fiberglass work I might need done.”

Amanda Lillet

Client Testimonials

“Pacific Fiberglass is amazing. Doug is above and beyond. They went above and beyond on our boat after it got hit in the marina. Look no further - this company is top-notch!!!”

Jelaine Larson

Client Testimonials

“Robert and team were personable and fun to work with. They took my boat in for a couple of minor repairs which were completed as promised. They assumed good will with me and I appreciate both the service and quality of workmanship! Thank you!”

Will Bailey

Client Testimonials

“Doug and his team did me proud. I took my boat in for bottom paint and some other minor repairs. The weather wasn't cooperative so we had a couple minor delays. But once they completed the work, I was very happy. Under budget and done right. Robert especially was key, he kept me informed and up to speed on the job. I'm glad I decided to go with Pacific Fiberglass. Thanks guys.”

Edward Garcia

Get In Touch With Us Today

Contact Pacific Fiberglass today to discuss your project or request a personalized estimate from Seattle’s trusted fiberglass specialists.