How to Install a Door Jamb: A Step-by-Step Guide

How To Install A Door Jamb

Installing a door jamb can be a challenging task, especially if you’re doing it for the first time. However, with the right tools, materials, and instructions, you can install a door jamb like a pro. In this guide, we’ll take you through a step-by-step process on how to install a door jamb.


Before we dive into the installation process, let’s first understand what a door jamb is. A door jamb is a vertical frame that surrounds the door opening and supports the door hinges and latch. Installing a door jamb has several benefits, including providing a stable and secure structure for your door, improving energy efficiency, and enhancing the overall appearance of your doorway.

To successfully install a door jamb, you need to have the right tools and materials. Here’s a list of what you’ll need:

Materials Needed

  • Door jamb kit
  • Measuring tape
  • Hammer
  • Nails
  • Screwdriver
  • Wood shims
  • Wood glue
  • Level
  • Saw
  • Wood filler
  • Sandpaper

Now that you have all the necessary tools and materials let’s move to the next section, where we’ll look at the preparation process.


Before you start installing the new door jamb, you need to prepare the door frame. Here’s what you need to do:

Measuring the Door Frame

The first step is to measure the height and width of the door frame. Measure the width at the top, middle, and bottom of the frame to ensure that it’s consistent. Also, measure the height from the floor to the top of the frame, and make sure it’s level. The measurements will help you know the size of the door jamb to buy.

Removing the Old Door Jamb

The next step is to remove the old door jamb. Start by removing the door trim using a pry bar or a hammer. Once the trim is off, use a reciprocating saw or a chisel to cut through the nails that hold the jamb in place. Gently remove the old jamb, making sure not to damage the door frame.

Preparing the Door Frame

After removing the old jamb, you need to prepare the door frame for the new jamb. Start by cleaning the frame and removing any debris or old adhesive. Next, place wood shims on the floor near the hinges to provide support for the new jamb. Apply wood glue to the shims and place the new jamb on top, making sure it’s level and flush against the frame.


With the door frame prepared, it’s time to install the new jamb. Here’s how to do it:

Installing the New Door Jamb

Start by nailing the new jamb to the frame using finishing nails. Use a level to ensure that the jamb is straight and plumb. Next, install the hinges and latch on the jamb, making sure they’re properly aligned.

Securing the Door Jamb in Place

Once the jamb is in place, use wood shims to fill any gaps between the jamb and the frame. Apply wood glue to the shims and insert them between the jamb and the frame. Use a hammer to gently tap the shims until they’re snug in place.

Checking for Level

Finally, check the level of the jamb and adjust as needed. If the jamb is not level, use shims to adjust it until it’s straight. Once you’re satisfied with the level, trim the excess wood using a saw and apply wood filler to any gaps or nail holes. Sand and paint the jamb to match the door frame, and your new jamb is installed and ready to use.


Once you’ve installed the door jamb, the next step is to finish it. Follow the steps below to finish the door jamb:

Trimming the Excess Wood

Use a saw to trim any excess wood from the door jamb. Make sure to cut the wood at an angle to create a smooth transition between the jamb and the wall. Use sandpaper to smooth out the edges.

Applying Wood Filler

If there are any gaps between the jamb and the wall, use wood filler to fill them. Apply the wood filler using a putty knife and let it dry according to the manufacturer’s instructions.

Sanding and Painting

Once the wood filler has dried, use sandpaper to smooth out any rough spots. Sand the entire door jamb to create a smooth surface. Finally, paint the door jamb to match the color of your walls.


Installing a door jamb may seem complicated, but with the right tools and instructions, it’s a simple process. Here’s a summary of the steps:

  1. Measure the door frame and purchase a door jamb kit.
  2. Remove the old door jamb and prepare the door frame.
  3. Install the new door jamb and secure it in place.
  4. Check for level and adjust if necessary.
  5. Trim any excess wood, apply wood filler, sand, and paint.
  6. Enjoy your new, secure, and energy-efficient door jamb.

Remember, installing a door jamb requires attention to detail and patience. Take your time and follow the steps carefully for a successful installation. Good luck!