HOW TO USE IT
How to use the Interior Door Replacement Cost Calculator
- 1
Enter how many interior doors to replace.
- 2
Choose the door price (hollow, solid, sliding).
- 3
Enter installation per door and review the total.
THE MATH
Interior door formula
Total cost = count × (door price + installation)The cost includes the door (hollow-core, solid, sliding, pocket) plus installation: removing the old door, hanging, hardware and trim.
PRACTICAL EXAMPLE
One standard interior door
1 × ($150 door + $250 installation) = $400.
FAQ
Frequently asked questions
Which door type?
Hollow-core is budget and light; solid-core blocks sound and feels premium; sliding or pocket doors save space.
Do I need a new frame?
If the frame is square, a prehung door drops in. Old houses often need frame work, which adds $50-$150 per door.
How long does it take?
A standard prehung door installs in 1-2 hours; with jamb work, plan half a day per door.