You can replace an interior door knob yourself with a screwdriver and five minutes per door

Interior door knobs fail because the internal spring wears out, the latch jams, or the spindle (the rod connecting both sides) breaks. Replacing one costs between $15 and $40 for the knob itself and takes about 30 minutes your first time, faster after that. You do not need a locksmith, special tools, or any plumbing or electrical work — just a screwdriver that fits the screws on your knob.

The job is the same whether you are replacing a broken knob or upgrading to a new style. Remove the old knob, note how the latch sits in the door edge, and install the new one in the same position. Most interior knobs are not keyed, so you will not need to match a lock cylinder or worry about security features.

Key Takeaways

  • Interior door knobs attach with two screws on the interior side of the door and slide off once those screws are removed.
  • The latch — the bolt that holds the door closed — stays in the door frame and does not need to be removed unless you are changing door thickness or the knob style requires a different latch.
  • Measure the distance from the center of the door to the center of the latch hole before you buy a new knob, because standard spacing is 2.375 inches but older doors may differ.
  • Interior knobs come in two types: passage (no lock) and privacy (lock button on the inside), so buy the same type as what you are removing unless you want to change function.

What you need before you start

Gather a screwdriver (usually Phillips head, sometimes flathead — check the screws on your current knob), the new knob, and a tape measure. Place the new knob box nearby so you can reference the installation diagram if you get stuck. Some knobs come with a small metal template to help position the latch; set that aside if yours includes one.

Check that the new knob fits your door thickness. Most interior doors are 1.375 inches thick, and most knobs work on that standard. If your door is thicker or thinner — common in older homes or custom doors — the new knob may not close properly. Measure your door edge with the tape measure before you remove the old knob.

Remove the old knob in three steps

Look at the interior side of the door knob. You will see two screws holding the knob assembly to the door. One screw is usually on the knob itself, and one is on the rose (the round metal plate behind the knob). Turn both screws counterclockwise with your screwdriver until they are loose enough to remove by hand.

Once both screws are out, the knob assembly will slide away from the door. You may need to wiggle it slightly or pull the interior knob toward you while pushing the exterior knob away. The latch — the metal piece sticking out from the door edge — will remain in the door frame. Do not remove it unless the new knob requires a different latch style, which the instructions will specify.

Set the old knob aside. If you are replacing a privacy knob (one with a lock button), note which side the lock button was on so you can orient the new knob the same way. If you are replacing a passage knob with a privacy knob, or vice versa, you may need to swap the latch, but most modern knobs work with either type.

Install the new knob

Slide the new knob onto the spindle from the interior side of the door. The spindle is the metal rod that goes through the door and connects the interior and exterior knobs. Line up the screw holes on the new knob with the holes in the door. If the holes do not line up, the spindle may be bent or the new knob may not be compatible with your door — stop and check the product instructions.

Insert both screws by hand first, then tighten them with your screwdriver. Do not over-tighten; stop when the knob is snug and does not rattle. If you tighten too much, you can crack the rose or strip the screw holes. The knob should turn smoothly and the latch should click in and out without resistance.

Test the door from both sides. Turn the knob, push the door open, and make sure the latch retracts fully. Close the door and confirm the latch catches. If the door does not close all the way or the latch does not catch, the latch may need adjustment — see the troubleshooting section below.

When the latch needs adjustment

If the new knob does not close the door properly, the latch may be sitting too high or too low in the strike plate (the metal cup on the door frame). Remove the two screws holding the latch in place on the door edge and slide the latch up or down slightly, then reinstall the screws and test again.

If the latch still does not catch, the strike plate itself may be misaligned. Loosen the two screws on the strike plate and move it up or down to match the latch position. This is rare with interior doors because they do not close under pressure, but it can happen if the door frame has shifted.

Passage knobs versus privacy knobs

A passage knob has no lock — the knob turns freely on both sides. Use these on closets, pantries, and hallways where you do not need to lock the door. A privacy knob has a lock button on the interior side (usually a small push-button or turn-button on the knob itself) that prevents the exterior knob from turning. Use these on bedrooms and bathrooms.

If you are swapping from one type to the other, the latch may need to change as well. Passage latches are shorter and simpler; privacy latches have a mechanism that locks the bolt in place. Check the new knob's instructions to see if it requires a specific latch type. If it does and your current latch does not match, you will need to replace the latch as well — a job that takes about 10 extra minutes and requires a chisel to fit the new latch into the door edge.

Frequently Asked Questions

Do I need to remove the latch to install a new knob?

No, not unless the new knob requires a different latch style or you are changing the door thickness. Most interior knobs work with the existing latch. Check the new knob's instructions before you start; if they do not mention the latch, leave it alone.

What if the screws on the new knob do not line up with the holes in the door?

The spindle may be bent, or the new knob may not be compatible with your door. Check that you are using the correct knob for interior doors (not exterior, which have different spindle lengths). If the spindle looks straight and the knob is the right type, the door holes may be damaged — you can drill new holes slightly offset, but this is rare.

Can I use an exterior door knob on an interior door?

No. Exterior knobs have longer spindles and different latch mechanisms designed for keyed locks and weather resistance. They will not fit properly on an interior door and may not function at all. Always buy a knob labeled for interior use.

How do I know what size knob to buy?

Measure the distance from the center of the door to the center of the latch hole. Standard spacing is 2.375 inches (also called 2 3/8 inches). Older homes may use 2.125 inches. The new knob box will list the spacing it requires; match that number to your door measurement.

What if the door knob spins but does not open the door?

The spindle is broken or disconnected. Remove the interior knob and check that the spindle is fully inserted into the latch mechanism. If it is loose or bent, replace the spindle (some knobs sell replacement spindles separately) or replace the entire knob assembly.