How to Change a Doorknob: Step-by-Step DIY Guide (2026)

Door knobs play a crucial role in our everyday lives, offering both security and aesthetic appeal to our homes. While they may seem like basic fixtures, old, loose, or tarnished hardware can make an entire room feel dated. Over time, internal springs wear out, latches start to stick, and a simple replacement becomes necessary.

Learning how to change a doorknob is one of the easiest, most rewarding DIY projects a homeowner can tackle. You do not need to hire a locksmith or a handyman. With a single screwdriver and 15 minutes of your time, you can completely upgrade your home’s security and style. This guide will walk you through every step, from removing stubborn hidden screws to installing your new hardware perfectly flush.

Tools and Materials Needed

Before you begin, gather the right tools to avoid multiple trips to the garage. You likely already own everything you need:

• Phillips-head screwdriver (Avoid using a power drill, as it can easily strip the screws or scratch your new knob’s finish).
• New doorknob set (Includes the interior/exterior knobs, latch assembly, strike plate, and screws).
• Tape measure
• A small flathead screwdriver or paperclip (Essential for removing older knobs with “hidden” screws).
• Wood chisel and hammer (Only needed if the new latch plate is slightly larger than the old mortise hole).

Step 1: Removing the Old Doorknob

Begin by propping the door open with a doorstop so it does not swing while you work.

1. Find the Screws: Examine the interior side of the door. Most standard interior knobs have two visible Phillips-head screws on the baseplate (the rose).
2. Remove the Knobs: Unscrew both screws completely. Once removed, grab both sides of the doorknob and pull them straight apart. The spindle will slide out of the latch mechanism.
3. Remove the Latch: Look at the edge of the door. Remove the two screws holding the latch plate in place, then pull the entire latch assembly out of the hole.
4. Remove the Strike Plate: Finally, unscrew the old strike plate from the door frame (the door jamb) so you can install the new, matching one.

Step 2: Preparing and Measuring the Door

With the old hardware removed, inspect the large cross-bore hole and the smaller edge-bore hole. Ensure they are free of splinters or old paint buildup.

Before installing the new latch, you must check the backset (the distance from the edge of the door to the center of the large hole). Standard backsets are either 2 3/8 inches or 2 3/4 inches. Most modern doorknob latches are adjustable; simply twist or pull the latch mechanism to expand it to the correct length for your door.

Step 3: Installing the New Doorknob

Now it is time to put everything together. Follow these steps carefully to ensure a smooth, secure fit.

1. Insert the Latch: Slide the new latch assembly into the hole on the edge of the door. Crucial step: Make sure the curved, slanted part of the latch bolt is facing the door jamb (the direction the door closes). Secure it with the provided wood screws.
2. Insert the Exterior Knob: Take the exterior knob (the side with the lock cylinder or the flat side) and slide its spindle through the corresponding slot in the latch assembly you just installed.
3. Attach the Interior Knob: Slide the interior knob over the spindle protruding from the other side. Align the screw holes.
4. Secure with Screws: Hand-thread the long mounting screws to ensure you do not cross-thread them. Tighten them evenly with your screwdriver until the baseplates are flush against the door. Do not overtighten, or the lock mechanism will bind.

Step 4: Installing the Strike Plate and Testing

Attach the new strike plate to the door jamb using the provided screws. If the new plate is slightly larger than the old mortise cutout, use a wood chisel to carefully shave away a small amount of wood so the plate sits perfectly flush.

The Final Test: Turn the knob to ensure it rotates smoothly and the latch retracts fully. Close the door to verify it clicks securely into the strike plate without needing to be forced. Engage the lock to ensure it functions properly.

Troubleshooting Common Doorknob Issues

Even with careful installation, you might run into a minor hiccup. Here is how to fix the most common problems:

• The doorknob is stiff or won’t turn smoothly: This is almost always caused by overtightening the mounting screws. It pinches the internal mechanism. Back the screws out a quarter-turn and test it again.
• The door won’t latch shut: If the door bounces back open, the latch is not lining up with the hole in the strike plate. You may need to slightly loosen the strike plate screws and shift it up or down, or use a file to enlarge the hole in the metal strike plate.
• The latch bolt is installed backward: If you have to turn the knob to pull the door shut, you installed the latch backward. Remove the knobs, pull the latch out, flip it 180 degrees, and reinstall.

Frequently Asked Questions

Is it difficult to replace a doorknob?
Not at all. Replacing a standard interior or exterior doorknob is considered a beginner-level DIY project. Assuming the holes in your door are already the correct size, the entire process takes about 10 to 15 minutes and requires only a Phillips-head screwdriver.

Should I use a power drill to install the new doorknob?
It is highly recommended to use a manual hand screwdriver. Power drills can easily strip the heads of the small screws, overtighten the mechanism (causing the knob to bind), or slip and severely scratch the finish of your brand-new hardware.

What is the backset on a door, and why does it matter?
The backset is the distance from the edge of the door to the exact center of the doorknob hole. In the US, standard backsets are either 2 3/8″ or 2 3/4″. Most modern replacement latches are adjustable to fit both lengths, but it is always good to measure before purchasing new hardware.