The $1.8 million expansion added 32 boat-repair stalls, for a total of 72.
Before the Craftsman District opened in 2008, boatyards and related businesses were scattered around the port.
Now boat owners who need to order repairs can get their sailboats and yachts hauled out of the water, washed down and repaired all in one spot.
The Craftsman District also has a larger Travelift that can hoist out of the water boats up to 150 feet long and 75 tons.
That's enabled boat-repair businesses to work on bigger boats, including yachts, tugs and fishing vessels.
The port leases the stalls to independent repair businesses and individuals who want to make repairs themselves. A boat outfitter and other related businesses are close by.
In 2011, before the expansion opened, storage, repair and haul-out fees generated $637,000 in revenue, the port said. Marine-service businesses leasing space in the Craftsman District brought in an additional $90,000.
Beyond the convenience, the expanded boat yard also puts the port above and beyond compliance with more stringent environmental standards.
A complex system under the boatyard traps dirty water and removes pollutants before sending it into the city's system for further treatment.
Tough federal and state environmental standards are driving other boatyards out of business, said port spokeswoman Lisa Lefeber.
Snohomish County has one of the largest inventory of slips in the state but a disproportionately small number of places to get boats repaired, she said.
There's another boatyard outside the Craftsman District, but that yard is expected to close next year, Lefeber said.
The port expects to expand the Craftsman District boatyard again in the future -- as soon as five years.
Reporter Debra Smith: 425-339-3197 or email@example.com.