GITS Window and Door Contractor Home Study CourseIs paying $199. 99 worth it to you if you can guarantee that do not have to take the exam a second or third time? Window and Door Contractor Class WD for Palm Beach, Duval, and Brevard Counties. Scope Window and Door Contractor Class "WD": The scope of work of a Class "WD" specialty building contractor shall be limited to the installation, replacement, adjustment, repair, and servicing work, when not prohibited by law, in accordance with accepted