Federal Construction Project PLA Requirements: Project Labor Agreements (PLAs) set uniform standards for wages and other conditions of work prior to the commencement of a construction project. Unions are proponents of PLAs because it dramatically reduces competition from non-union construction companies. Unions say PLAs reduce cost and increase efficiency in construction projects. Many others argue PLAs reduce competition and increase cost. Now, all federal construction projects over $35 million must include PLAs mandating construction companies have an agreement with unions before commencing work on the project.