Suffolk County is a located in the U.S. state of New York. We're proud of the work we've done to help transform the skyline in New York.As a national leader in our industry, Suffolk is revolutionizing what you expect from a contractor. We're here to answer all your questions. Fill out our contact form and we'll connect you with the people who can help. This guide to Suffolk for subcontractors lets you get to know the company including tips that you can use to speed up the payment process. All tradespersons on site will be required to provide proof of competency training based upon the activities and tasks they are completing. Bids and proposals must be received and time stamped in the Purchasing Division office prior to the date and time specified in the solicitation document.