What Is The Standard Preparation Hole Size For A Door Knob?

Door knobs come in all shapes and sizes. And before installing a knob, it's crucial to ensure you have the correct size hole prepared. Otherwise, your doorknob may not fit properly. If not, don't worry. We will go over that in this blog post. 

The standard size hole for a doorknob is two inches in diameter. The hole for a deadbolt is usually slightly larger, around two and a half inches.

In this article, we'll discuss the standard hole size for doorknobs and other related information, such as installation and removal. Keep reading to learn more!

An inner part of door latch mechanism is at assembly stage, What Is The Standard Preparation Hole Size For A Door Knob?

What Is Standard Door Preparation?

Door preparation is the work done to a door to ready it for installation. Typically, this includes cutting the door to size and drilling holes for the doorknob, deadbolt, and other hardware.

Other factors that can affect door preparation include the thickness of the door, the type of hinges being used, and any other special features like peepholes or kick plates.

Most doors come with at least some basic door preparation already completed. However, if you are installing a new door or replacing an old one, it is essential to ensure that it is properly prepared before proceeding.

How Do You Measure a Door Knob Hole?

Installation of the door lock

To measure a doorknob hole, you need a tape measure and a pencil. First, locate the center of the doorknob hole. Next, use the tape measure to determine the diameter of the hole. And finally, use the pencil to mark the measurement on the door.  

How To Remove and Replace a Door Knob?

Assembly of lock with handles and latch for an interior door

Materials You Need When Installing a Door Knob

Here's a list of the tools and equipment you'll need

  • Screwdriver and Screws
  • Tape Measure
  • New Door Knob
  • Screws
  • Chisel
  • Latch plate
  • Hammer
  • Wooden block

How Do You Measure a Door Knob Hole?

To measure a doorknob hole, you need a tape measure and a pencil. First, locate the center of the doorknob hole. Then, use the tape measure to determine the diameter of the hole. Finally, use the pencil to mark the measurement on the door.  

How To Cut a Hole For Door Knob

  1. Prepare all the needed materials. 
  2. Position the door to have easy access to where you'll be installing the new doorknob.
  3. Use a drill that is slightly smaller than the desired hole size. For a two and one-eighth inch hole, use a two-inch drill bit. This will give you a little wiggle room and make getting the perfect size hole easier.
  4. Mark the center of where you want the hole with a pencil. Use a level to make sure that your mark is level. Otherwise, the doorknob will be installed crooked. 
  5. Slowly, drill into the door at your marked location. Be careful not to go too fast, or you could split the wood. 
  6. Use a chisel to enlarge the drilled hole until it is the correct size. 
  7. Install the new doorknob. 

How To Remove Your Old Door Knob?

Home Improvements replacing door knob

Unscrew the mounting screws that are holding the doorknob. If your door has a plate around the knob, you may also need to remove that. Finally, you can pull off the old doorknob. 

How to Install the New Door Knob?

Man is installing the doors handle

Whether you're installing a new doorknob to a new door or replacing an old one, follow these steps:

  1. Install a latch plate that fits your door mortise on top of the latch. 
  2. Insert the latch inside the edge of the door. Make sure that the beveled side does not face the jamb to prevent difficulty in closing the door.
  3. Use a hammer to tap the latch into place until the latch's back reaches the end of the hole. 
  4. Secure the latch into the door as required by its structure. 
  5. Insert the first half of the doorknob through the latch. Then, align the other half of the doorknob with the first one. During this step, make sure that both sides are aligned with their screw holes. 
  6. Push the two sides of the doorknob together. Next, attach both doorknob ends with screws. 
  7. Secure loose screws with wood putty. 
  8. Screw in the new strike plate and test the doorknob to ensure it works. 
  9. If needed, refinish or repaint the area around the doorknob. 

Different Door Knob Types

There are many types of doorknobs available on the market today. Different designs of doorknobs are for specific purposes. The doorknob you choose should satisfy your needs and preferences. 

Passage Door Knobs

Most doorknobs are passage doorknobs, which means they do not lock but are used to open and close a door. Typically, these knobs are for interior doors that do not need a lock.

Check out this All Metal Passage Door Knob Set on Amazon 

Privacy Door Knobs

Privacy door knobs are for doors that need a lock, such as bedrooms and bathrooms. You can lock these door knobs inside by turning the knob or via a keyed cylinder.

Keyed Entrance Door Knobs

Keyed entrance doorknobs are for exterior doors that require a lock. Turning the knob or using a keyed cylinder locks and unlocks these doorknobs.

 

Check Out This Copper Creek Keyed Doof Knob on Amazon

Dummy Door Knobs

Dummy door knobs are for doors that do not need a lock, such as closets or pantry doors. These door knobs are usually surface mounted and come in various styles.

 

Check Out This Glass Dummy Door Knob on Amazon

Frequently Asked Questions

When To Replace Your Knobs?

There isn't necessarily a set time or date when you should replace your knobs. However, it's good to do so if they're showing signs of wear and tear, including cracks, chips, or other damage to the finish.

If your knobs are feeling loose or wobbly, it's probably time to upgrade. Replacing your knobs is a relatively simple and inexpensive way to give your doors a fresh new look. So, don't be afraid to do it every once in a while!

Can I Install a Door Knob Myself?

You can install a doorknob yourself with the proper tools and instructions. However, if you are unsure about the process, it is always best to consult a professional.

Are All Door Knobs In Standard Size?

No, not all doorknobs are in standard size. The size of the doorknob will depend on the type of doorknob you choose.

Is Deadbolt Hole the Same as Door Knob?

No, a deadbolt hole is not the same as a doorknob. A door knob is typically smaller in diameter and does not require much space for installation. A doorknob is usually installed at a lower height on the door than a deadbolt.

What Is a Door Knob That Doesn't Turn Called?

A doorknob that doesn't turn is called a "dummy" knob. Dummy knobs are usually for decorative purposes or to complete the look of a door with little functionality. However, dummy knobs can fit on doors that open manually (without a latch) or doors already equipped with another locking mechanism, such as a deadbolt.

When To Replace Your Knobs?

There isn't necessarily a set time or date when you should replace your knobs. However, it's a good idea to do so if they're showing signs of wear and tear. Problems include cracks, chips, or other damage to the finish.

If your knobs are feeling loose or wobbly, it's probably time to upgrade. Replacing your knobs is a relatively simple and inexpensive way to give your doors a fresh new look - so don't be afraid to do it every once in a while!

Final Thoughts

It's always best to prepare for door installation, and knowing the standard preparation hole size for a doorknob is essential. With an awareness of the proper measurements, you can avoid potential problems or mistakes during the installation. It's good to know as much as you can about your doors before making any changes.

We hope this article helped inform you about the standard preparation hole size for a doorknob. Thanks for reading! Share this article with your friends or family if they're ever in need of some answers.

And since you're already here, you may also want to read the following articles:

Can You Put A Keypad On A Sliding Door?

How High Should A Deadbolt Be On A Door?

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