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For most standard interior doors, professional installation takes approximately three hours from start to finish. The timeframe may extend if complications arise, such as the need for wall repairs or custom fitting. More complex installations like pocket doors or double French doors require additional time. If you're tackling the project yourself, expect the process to take longer, especially if you're new to door installation.

Most straightforward door frame replacements don't require building permits since they're considered minor improvements that don't affect structural elements. However, if your project involves widening the door opening, creating a new doorway, or modifying load-bearing walls, you'll likely need to obtain a permit from your local building department. Historical districts and some homeowners associations may have additional requirements or restrictions.

For a DIY interior door installation, you'll need basic tools including a tape measure, level, power drill with various bits, screwdriver set, hammer, utility knife, and shims. You might also need a saw for trimming the door if necessary, sandpaper for smoothing edges, and a chisel for creating hinge mortises. Having a helper makes the job considerably easier, especially when positioning and holding the door during installation.

When measuring for a replacement door, determine whether you need just the door slab or a pre-hung unit that includes the frame. For a slab door, measure the width, height, and thickness of your existing door. For a pre-hung door, measure the width and height of the rough opening (from stud to stud and floor to header). Also note the swing direction—whether the door opens to the left or right when facing it from the outside of the room.