What is the standard width of a door frame in residential carpentry?

The standard width of a door frame in residential carpentry is typically 4 9/16 inches. This measurement reflects the common design used for the jambs, which accommodates a standard 1 3/4-inch thick door and allows for the necessary space for interior wall finishes, such as drywall. This dimension ensures that the door can swing freely without obstruction and provides a well-fitted frame that maintains structural integrity and aesthetic appeal.

The other options do not represent standard measurements for residential door frames. A width of 3 1/2 inches, while close to typical stud widths, does not provide adequate allowance for the door itself in most installations. Similarly, 5 inches and 6 1/2 inches are generally not used for standard residential door frames and would be more suited for specialized applications or larger doors that are atypical in residential construction.