You can replace a doorknob yourself with a screwdriver and five minutes

Most interior doorknobs come off with two screws and slide back on the same way. You do not need a locksmith or special tools. The whole job takes about 15 minutes, and the only thing that can go wrong is stripping a screw or dropping a small spring — both fixable.

The steps are the same whether you are replacing a broken knob, upgrading to a lever handle, or swapping out an old brass knob for something new. The only difference is whether your door has a privacy lock (a button on the inside of the knob) or a keyed lock on the outside.

Key Takeaways

  • Remove the two screws on the interior side of the door, then pull both knobs straight toward you — the shaft and collar come out together.
  • Slide the new knob onto the shaft from the outside, then push the interior knob back through and find it with the two screws.
  • If a small spring falls out during removal, set it aside when ready — you will need it when you reinstall the collar on the interior side.
  • Exterior knobs with keyed locks require you to align the lock cylinder correctly before tightening; turn the key to vertical before pushing the knob through.
  • If screws strip or spin without tightening, remove the knob, wrap one layer of plumber's tape around the screw hole threads, and try again.

What you need before you start

Gather a Phillips or flathead screwdriver (whichever matches your screws), a flashlight or phone light, and the new doorknob. Check that the new knob fits your door by measuring the hole diameter — standard doors use 2.125 inches. If your door has a keyed lock, the new knob must also have a keyed cylinder, or you will have a hole with nothing in it.

Set a small container or cup nearby. When you remove the interior knob collar, a spring and sometimes a small metal clip will fall out. Putting them in a cup keeps them from rolling under the refrigerator.

Removing the old knob step by step

Look at the interior side of the door (the side facing into the room). You will see two screws on the knob collar — the metal ring that sits against the door. Unscrew both of them completely and set them aside. Do not just loosen them; remove them entirely.

Pull the interior knob straight toward you. It will slide off the shaft. As you pull, a spring and sometimes a small metal retainer clip will come loose — catch them or let them fall into your cup. Do not lose these; you need them for the new knob.

Now pull the exterior knob (the one on the outside of the door) straight toward you as well. The shaft, collar, and lock cylinder all come out together as one piece. If the exterior knob has a keyed lock, the key will still be in the cylinder — that is normal.

Installing the new knob

Slide the new exterior knob onto the shaft from outside the door. If it has a keyed lock, align the lock cylinder so the key slot points straight up (vertical) before you push it all the way through. Push it until the collar sits flat against the door.

From inside the door, slide the interior knob onto the shaft. Before you do, place the spring back into the collar recess — it sits in a small cup-shaped indent. If there was a metal clip, it goes in the same spot. Then slide the interior knob on and push it toward the door until the collar sits flat.

Insert both screws and tighten them firmly. They should be snug but not so tight that you strip the threads. If a screw spins without tightening, stop, remove the knob, wrap one layer of plumber's tape around the threaded hole, and try again.

Testing the lock and adjusting if needed

Turn the interior knob to make sure it spins freely. If it is stiff or catches, the spring may not be seated correctly — remove the interior knob, check that the spring is in the collar indent, and reinstall.

If your new knob has a keyed lock on the outside, insert the key and turn it both directions. The lock should turn smoothly. If it binds or the key does not turn all the way, the lock cylinder may be misaligned. Remove the exterior knob, rotate the cylinder slightly, and reinstall.

Open and close the door several times. The knob should turn smoothly and the latch should catch when you close the door. If the latch does not catch, the problem is not the knob — it is the strike plate or latch alignment, which is a separate repair.

What to do if something goes wrong

If a screw will not tighten and spins in the hole, the threads are stripped. Remove the knob, wrap one layer of plumber's tape (also called PTFE tape or thread seal tape) around the screw hole threads, and reinstall the screw. The tape fills the gap and gives the screw something to grip.

If the spring fell out and you cannot find it, you can order a replacement spring online by the knob brand and model number, or you can visit a hardware store with the knob and ask for a matching spring. Most cost under five dollars. Do not install the knob without the spring — the interior knob will not stay in place.

If the new knob does not fit the hole, the hole may be the wrong size. Standard interior doors use 2.125-inch holes. If your hole is larger, you may need a knob with a larger collar, or you may need to fill the hole and drill a new one — that is a different project and usually requires a drill.

Keyed locks versus privacy locks

A privacy lock has a button or push-lock on the interior knob and no lock on the outside. You lock it from inside the room. These are standard for bedrooms and bathrooms. Replacement is the same as described above.

A keyed lock has a keyhole on the exterior knob and no lock button on the interior. You lock it from outside with a key. These are standard for exterior doors and some interior doors in offices or rental units. The only difference in installation is that you must align the lock cylinder vertically before pushing the exterior knob through the door.

Frequently Asked Questions

Do I need to remove the door from the hinges?

No. The knob comes off while the door is still hanging. You only remove the door if you need to drill a new hole or repair the hinges themselves.

What if the knob is stuck and will not pull out?

Try turning the knob while you pull — sometimes the shaft binds slightly. If it still will not budge, spray a small amount of penetrating oil (like WD-40) around the collar where it meets the door, wait five minutes, and try again. Do not force it or you may break the shaft.

Can I replace a keyed lock knob with a privacy lock knob?

Yes, as long as the hole diameter is the same (2.125 inches for standard doors). The shaft and collar are the same; only the lock mechanism differs. The installation steps are identical.

Why is my new knob loose even after I tightened the screws?

The spring may not be seated in the collar indent, or the screws may not be tight enough. Remove the interior knob, check that the spring is in the small cup-shaped recess, and tighten the screws firmly. If screws still spin, use the plumber's tape method described above.

How do I know which screwdriver to use?

Look at the screw head. If it has a cross or plus sign, use a Phillips screwdriver. If it has a single slot, use a flathead. Most modern doorknobs use Phillips screws. Bring the old knob to the hardware store if you are unsure.