How to replace The Exterior door Jamb and Threshold of your Home: DIY Simple steps

Replacing Exterior Door Jamb and Threshold

Replacing the exterior door jamb and threshold is a simple DIY project that can have a big impact on your home’s curb appeal and safety.

If your home’s door jamb or threshold needs to be replaced, we’ve got you covered with this article’s step-by-step guide. 

The replacement of a rotten exterior door frame is also covered, as is the installation of a new door in an existing frame. If you are on a tight budget and can’t afford to hire a professional, these are some do-it-yourself home improvement projects you can tackle.


Tools required for replacement of Exterior door Jamb and Threshold

It’s crucial to have everything you’ll need before you start. You will need:

  • The new door jamb and threshold
  • A drill
  • Screwdriver
  • Hammer
  • Chisel, saw level, tape measure
  • wood screws, wood shims, and the appropriate building materials.

To fully protect your new door from the elements, you may also need to invest in a door sweep or additional weatherstripping.
Step 1: The old door frame and threshold must be removed.
Before doing anything else, you’ll need to take out the old door frame and threshold. First, you’ll need to take the jamb out of its current location by removing any screws or nails that could be holding it. Carefully pry or chisel the jamb lose, using a chisel or pry bar if necessary. Take care to protect the adjacent wall and trim from accidental damage.
Step 2: A new door jamb must be measured and cut.
After the old door jamb has been taken out, the space can be measured for the new one. Before cutting, measure the opening’s width and height and add 1/8 inch to each measurement for wood movement. Cut the new door jamb to size following these specifications.
Step 3: Put in the replacement door jamb.
The replacement door jamb should then be put in place. The jamb is installed into the aperture first, and then wood screws are used to keep it in place. Check the jamb’s straightness and evenness with a level. Wood shims can be used to modify the jamb’s level if necessary.
Step 4: Set up the new barrier.
The new threshold can be set up once the door jamb has been installed. Get started by taking off the old threshold’s fasteners. Once the hole is prepared, the new threshold can be inserted and fastened into place with wood screws. Check that the threshold is flush with the ground.
Step 5: Put in weather stripping or a door sweep.
Installing weatherstripping or a door sweep will help keep the elements out as you enjoy your new door. First, determine how much space there is between the door and the jamb so you can accurately cut the weatherstripping or door sweep. After installing a door, it’s important to seal any gaps around it, as the manufacturer’s instructions say to do. This will keep drafts from coming in.

The external door jamb and threshold of your home should be simply replaceable if you follow these instructions. Taking on this easy DIY project is a terrific way to boost your home’s curb appeal and safety.

How to hang an exterior door in an existing frame?

You’ve got a new door, and you are thinking of how to replace it with an old entry door. This project will cost between $200 and $300 and will take between 2 and 3 hours to complete. This project requires a moderate level of carpentry skills. If you follow this guide, you can have it done with ease.
Follow these simple steps:

  • To establish what size to cut the new door, measure the existing door.
  • To score the cut line, clamp a straightedge to the new door and use a sharp utility knife.
  • Using a handheld circular saw, trim the door to size.
  • Place the old door on top of the new door and use a combination square to transfer the hinge-mortise placements to the new door.
  • Score the outline of the new hinges onto the door’s edge with a utility knife.
  • A hammer and a 34-inch-wide wood chisel are used to carve the hinge mortises.
  • After installing the hinges into the mortises, drill pilot holes for the hinge screws.
  • Attach one hinge leaf to each door.
  • Remove the old hinges from the door frame and replace them with the hinges’ remaining leaves.
    Insert the door into the frame and install the hinge pins.
  • Close the door and verify that it fits the opening properly. Use a block plane to remove a little wood from the door edge if necessary.
  • Utilizing a template and a hole saw, bore the lockset holes into the door’s face and edge.
  • Cut shallow mortises for the striker and deadbolt into the door’s edge.
    Install the deadbolt and lockset.
  • Check your work by locking the door behind you.
  • Paint or stain the door as desired, being sure to cover the front, back, top, and bottom surfaces, as well as both edges.

Hammer, Combination, Square, Circular Saw, Straight Edge, Chirsel ¾ inchs, Drill/ driver, Block plane, Utility knife, Drill bits- tapared, Hole saw and Hole boring jig

How to repair a rotted door frame?

What about rotting door frame, how do I replace it? Mold or rotting wood is usually easy to spot because it leaves dark, wet spots around the door frame.

When fungi feed on wet wood, they grow and make these dark spots.

But there are a few less obvious signs you should look out for, like

  •  Draughts by the front door
  • Room for improvement: seals between the door and frame
  • Difficulties in opening and closing the door without causing it to jam.

You should regularly inspect the weatherstripping and door frames on the outside of your home. Wood rot is not only an eyesore but can also lead to these other problems:

  1. Rising costs of heating and cooling systems because of drafts
  2. Leaks cause costly water damage.
  3. Damage to wooden structures caused by mold growth

The door frame may need to be replaced if the mold damage is extensive enough to warrant it. This will ensure that any and all mold growth and residual moisture have been eliminated and that the door will function properly in the future.

Should I replace it or fix it?

Replace the rotten part if…

  • You’ve seen some dark spots on the door jamb, but it’s clear that the damage is only in one spot.
  • You prod the area with a screwdriver, and the wood is soft but intact.


Replace the entire jamb if…

  • The mold has visibly spread through the door jamb, bending or crumbling it.
  • The damage has spread beyond the door frame and into the structure of your home.

Once you’ve determined that the damage is repairable, you must remove all rotted wood and damaged material. Here’s how it’s done:

How can I fix it?

Once you’ve determined that the damage is repairable, you must remove all rotted wood and damaged material. Here’s how it’s done:

Measure the damaged area.
Before cutting into the frame, remove any weatherstripping.
Using a chisel, saw, knife, or other preferred tool, remove the rotted areas.
Confirm the damaged area’s measurements.
Fill in the missing areas of the door jamb with an epoxy wood filler or cut your own replacement piece. If the cutout area is less than 8 inches in length, we recommend purchasing a replacement piece, such as these FrameSaver Rot Repair Pieces, to save time and headaches from cutting your own.
After putting the new material in place, sand the seam made by the replacement piece to make a smooth, seamless unit.
Once the exposed area has been repaired, prime and paint it to match the door frame.

Please keep in mind that if you do not remove any mold from the area, you will very quickly be dealing with another instance of wood rot. If you believe the damage to be too severe to remove all traces of mold, you should get in touch with a professional as soon as possible because it is possible that you will need to replace the entire door jamb.


It is in your best interest to prevent damage from occurring to your exterior door frames in the first place, despite the fact that it is possible to repair any damage that may occur. You can prevent the growth of mold and maintain the structural integrity of the wood in your exterior door frames by performing routine waterproofing and sealing maintenance on them. Touchups to routine painting or staining can be done as needed to further assist in the process of sealing and protecting wooden door frames.

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