How Long Does It Take to Install a Door?

Quick Answer

Installing a door takes 1–4 hours for most projects. A straightforward pre-hung interior door swap takes about 1–2 hours, while an exterior door replacement typically requires 3–4 hours. Projects that involve framing a new opening or significant structural changes can take a full day or more.

Time by Door Type

Door Type	DIY Time	Professional Time
Pre-hung interior door	1–2 hours	30–60 minutes
Slab interior door (existing frame)	1.5–3 hours	45–90 minutes
Pre-hung exterior door (replacement)	3–4 hours	2–3 hours
Exterior door (new opening)	6–10 hours	4–6 hours
Sliding glass door	4–6 hours	2–4 hours
French doors	4–8 hours	3–5 hours
Storm door	1–2 hours	30–60 minutes

Pre-Hung vs. Slab Doors

Pre-Hung Doors

A pre-hung door comes already mounted in its frame with hinges attached. This is the easier option for DIYers and the faster installation. You remove the old frame and door together, set the new unit in the rough opening, shim it level and plumb, and secure it with screws. Most of the fitting work is already done at the factory.

Slab Doors

A slab door is just the door panel itself—no frame, no hinges, no hardware. You need to mortise the hinges, drill holes for the doorknob and latch, and carefully fit the slab to the existing frame. This requires more tools and precision, adding 1–2 hours to the project. Slab doors make sense when the existing frame is in good condition and you only want to replace the door itself.

Interior vs. Exterior Doors

Interior doors are lighter, simpler to install, and do not require weatherproofing. The rough opening is usually already framed and standard-sized.

Exterior doors involve more complexity: weatherstripping, threshold alignment, insulation around the frame, a drip cap, and possibly a deadbolt. Proper sealing is critical for energy efficiency and security. Many homeowners hire professionals for exterior door installations.

Tools You Will Need

• Level (4-foot preferred)
• Tape measure
• Drill/driver with bits
• Shims (cedar or composite)
• Finish nails or trim screws
• Utility knife
• Chisel (for slab door hinge mortising)
• Circular saw or reciprocating saw (if modifying the opening)
• Caulk and expanding foam insulation (exterior doors)

DIY vs. Hiring a Professional

Factor	DIY	Professional
Cost	$50–$150 (hardware/supplies)	$150–$500 (labor)
Time	1–4 hours	30 minutes–3 hours
Skill level	Moderate	Expert
Best for	Pre-hung interior doors	Exterior doors, new openings

DIY installation is practical for interior pre-hung doors if you are comfortable with basic carpentry. Exterior door installations, especially those requiring structural changes, are best left to professionals who can ensure proper insulation, weatherproofing, and code compliance.

Common Issues That Add Time

• Out-of-square openings: Older homes often have rough openings that are not perfectly square, requiring extra shimming and trimming
• Rotted framing: Damaged wood around the opening must be repaired before the new door goes in
• Flooring transitions: New flooring height may require trimming the bottom of the door or adjusting the threshold
• Lock and hardware upgrades: Adding a smart lock or multi-point lock system adds 30–60 minutes

Tips for a Smooth Installation

• Measure the rough opening three times before purchasing a door
• Buy a door slightly smaller than the opening to allow room for shimming
• Use at least three shims per side for a secure, plumb fit
• Do not over-tighten screws, which can bow the frame and prevent the door from closing properly
• For exterior doors, apply a continuous bead of caulk between the frame and the siding to prevent water infiltration