Cay Marine Sebastian – Full-Service Boatyard & Marina on Florida’s Treasure Coast.

Located in the heart of Sebastian, Florida, Cay Marine Sebastian is a full-service boatyard and marina established in 2021 by owner and operator Stephen Petersen. Built on a foundation of quality craftsmanship and trusted service, we proudly serve the Treasure Coast boating community.

We specialize in comprehensive vessel care—from routine maintenance and bottom work to prop reconditioning, fiberglass repairs, re-powers, and more. Our skilled team brings expertise and attention to detail to every job, helping you maintain your boat with confidence.

Cay Marine Sebastian also offers high and dry storage for vessels up to 42 feet, wet slips up to 55 feet, and boat lifts for boats up to 40,000 pounds—all with easy access to the Indian River Lagoon and the Atlantic.

Whether you're a local boater or a seasonal cruiser, Cay Marine Sebastian is here to keep you on the water, running strong, and ready for your next adventure.

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Holiday Hours

Office Closed: December 25th and January 1st
Limited hours from 8AM - 1PM on December 24th, 26th, 31st and January 2nd.
Please call by 10am on December 24th, 26th, 31st and January 2nd if you want your boat splashed.