DSHS, as an agency of Washington State government, is exempt from property tax. b. Contractor's Warranty: In the documents, the Contractor warrants to the Owner that the.Upon execution of this Contract, Contractor shall complete, execute, and deliver to the City the Contractor's Retainage Agreement set forth in the. Download our Washington independent contractor agreement so you can explain the services a contractor will perform a for a client. This Washington Construction Contracts page summarizes the terms and requirements every Washington construction company should know. Documentation: evidence the contractor is named in the grant proposal. Next, provide the project description and contract sum. The public agency will send an Invitation only to the next "rotated" contractor.