Yes. Washington State Law requires that contractors are licensed and bonded at the time of bid opening. You must also be properly registered to do business in the state of Washington. For those particular requirements, check with Labor and Industries, the Secretary of State’s Office, and the Department of Revenue. Some projects may require additional expertise, experience, or prequalifications. This happens most often in specific areas such as bridge engineering, bridge construction, or historic preservation, for example. These are project specific and are plainly included within the respective plans, specifications, and instruction to bidders.