In 1810, specialised shipbuilding on the River Clyde began when the brig "Janet Dunlop" entered the water from the shipyard of William Simons. Some 50 years later, a new company, Lobnitz began shipbuilding and ship repairs in an adjoining yard at Renfrew. In the later part of the 19th century, both companies produced increasing numbers of dredges, hopper barges, tugs and other specialised craft and by 1960 a total of over 1260 specialised vessels had been built.
In that year, after 150 years of experience and over 100 years of competitive rivalry, William Simons and Lobnitz & Company combined to form one of the world's leading organisations in the building of ships, dredges, and specialised marine and offshore equipment to create a name which became synonymous with the industry, Simons-Lobnitz Limited.
Throughout the 1960's Simons-Lobnitz continued to be the leader in the development of dredging and the application of new technologies. Ultimately, Simons-Lobnitz was absorbed into Upper Clyde Shipbuilders Limited, but in 1969 due to the declared marketing policy of U.C.S. to concentrate exclusively on the design and building of standard vessels, it was decided that to safeguard the considerable knowledge gained in the field of dredging, an independent company Seadrec Limited should be formed.
Seadrec is thus founded upon a history of over 150 years and commenced its life with all the Executive Directors and the Technical Staff, expertise and background of their former company, Simons-Lobnitz Limited, and is considered the modern-day successor to this renowned old Clydeside dredge building concern.
Since its inception Seadrec Limited has rapidly expanded its range of marine activities. In addition to undertaking major dredge and shipbuilding projects, it designs, builds and supplies an extensive range of dredges and associated craft from the International Class Suction Hopper Dredges carrying 14,000 tonnes of spoil through Bucket, Dipper and Grab Dredges to powerful Contractor Class Cutter Suction Dredges.
In recent years, successful contracts have been implemented in Finland, Sweden, USA, Canada, Mexico, Cuba, India, Norway, Singapore and U.K.