How to Replace a Door Knob: Passage, Privacy, and Keyed Entry Knobs (2026)

Frequently Asked Questions

What is the difference between a passage knob, privacy knob, and keyed entry knob?

Passage knob: no lock — turns freely from both sides. Used for hallways, closets, and rooms that don't need privacy. Privacy knob: has a push-button or twist lock on the interior side — can be locked from inside but has an emergency pin-hole override on the exterior (insert a small pin or straightened paperclip to release from outside). Used for bedrooms and bathrooms. Keyed entry: has a key cylinder on the exterior and a turn-button or push lock on the interior. Used for exterior doors that need key access from outside. If you're replacing a bathroom or bedroom knob: buy a privacy set. If replacing a hallway or closet knob: passage set.

How do I choose the right backset for a replacement door knob?

Backset is the distance from the edge of the door to the center of the knob hole. The two standard sizes are 2-3/8 inch (most common on interior doors) and 2-3/4 inch (most common on exterior doors). Measure from the edge of the door to the center of the existing knob hole before buying. Most modern door knob sets are adjustable to fit both backsets — they include a latch that can be set to either length. Confirm the replacement you buy fits both 2-3/8 and 2-3/4 inch backsets, or matches your exact measurement.

The new door knob won't latch properly — the latch doesn't reach the strike plate. What's wrong?

Check three things: (1) Backset: if the latch falls short of the strike plate, the backset setting is wrong — adjust the latch to the correct backset length. (2) Strike plate position: the strike plate may be misaligned. Close the door and watch where the latch hits — use a crayon or lipstick on the latch tip, then close the door and see where it marks the jamb. Move the strike plate to match. (3) Door alignment: if the door has settled or the frame shifted, the latch center won't align with the strike plate hole. See How to Fix a Door That Won't Latch for door alignment adjustments.

How do I remove a stuck or old door knob without visible screws?

Many older knobs hide their screws. Look for: (1) A small pin-hole on the knob neck — insert a thin tool (a small nail or bent paperclip) to press the release pin while pulling the knob off. (2) A slot or detent button on the side of the neck — use a flathead screwdriver to push in while pulling. (3) Decorative rose that twists off — grip and rotate the rose counterclockwise to expose the mounting screws underneath. Once the rose is removed, you'll find the two mounting screws.

Can I replace just the knob without replacing the latch?

Sometimes. If the new and old knobs have the same spindle size and the latch is in good condition: you may be able to keep the existing latch and just swap the knob halves. However, latches are brand-specific — the spindle from a new Schlage knob may not engage an old Kwikset latch. The safest approach is to buy a complete lockset (knob + latch + strike plate) which guarantees compatibility. Complete sets cost $15–$60 for interior sets, $40–$150 for exterior keyed entry.

To replace a door knob: (1) Remove the two screws on the interior rose (the round plate around the knob). (2) Pull both knob halves off the door from each side — they’re held only by the screws.

Door knob replacement is one of the fastest home repairs — typically under 15 minutes.

What you need

• Replacement door knob set ($15–$60 for interior; $40–$150 for keyed entry)
• Phillips and flathead screwdrivers
• Tape measure (to measure backset before buying)

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Step 1: Measure the backset before buying

Measure from the edge of the door to the center of the existing knob hole. This is your backset — 2-3/8 inch or 2-3/4 inch. Write it down before going to the hardware store.

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Step 2: Remove the old knob

Find the two screws on the interior side of the door (on the rose around the knob, or exposed after removing a decorative cover). Unscrew both. Pull the knob halves off the door from each side.

Remove the two screws from the latch faceplate on the door edge. Slide the latch assembly out through the edge.

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Step 3: Install the new latch

Slide the new latch into the door edge hole. The angled (ramped) face of the latch bolt must face toward the door stop — the direction the door closes into the frame. Secure with the two latch faceplate screws.

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Step 4: Install the exterior knob

Insert the exterior knob through the large round hole from the exterior side, feeding the spindle through the latch mechanism. There is usually a key slot — note which way it faces (typically up).

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Step 5: Attach the interior knob and rose

From the interior side, align the interior knob with the spindle. Thread the two long mounting screws through the interior knob/rose into the threaded posts on the exterior side. Tighten evenly — do not overtighten, which can bind the knob.

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Step 6: Install the strike plate

Remove the old strike plate from the door jamb. The new strike plate may have different screw hole spacing — if so, remove the old plate and fill the old screw holes with toothpicks and glue. Install the new strike plate, aligning the hole with where the latch makes contact. Test: close the door fully and confirm the latch clicks into the strike plate hole.

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Related guides

• How to Fix a Door That Won’t Latch — alignment issues after new knob installation
• How to Install a Deadbolt — adding a deadbolt above the new knob on exterior doors
• How to Fix a Door Frame — strike plate area repair before new knob installation
• How to Fix a Loose Door Handle — tighten a handle that wobbles without replacing the whole knob