Things You'll Need:
- Hammer
- Tape measure
- Pre-hung doors
- Wooden shims
- Level
- Nails
- Batt insulation
- Trim or casing
- Caulk
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Step 1
Start by removing the trim and casing from around your existing door. Use the claw end of a hammer to pry it gently away from the wall, both on the interior and exterior of the home. Save these pieces if you'd like to reuse them, or discard them if you plan to purchase new trim.
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Step 2
Remove the nails or screws along each jamb. Have a partner hold the unit in place as you do this. Once all fasteners are removed, slide the entire unit out of the opening towards the outside of the home. You can donate the door to a construction salvage facility or send it to the local landfill.
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Step 3
Take the dimensions of the opening using a tape measure. Add about 1/4 inch to both the length and width of the opening before purchasing your new door. This dimension allows for clearance, and also gives you room to install the new unit.
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Step 4
Purchase a pre-hung door from your local hardware or home improvement store. If you'd like a specific pattern or style, consult one of the specialty retailers listed in the Resources section of this article.
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Step 5
Unwrap the unit and remove all plastic and packaging. Do not remove the clips that are holding the door closed.
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Step 6
Slide the door into the opening, bottom first. Ensure that the doors are swinging out (towards the outside), and center the doors the best you can.
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Step 7
Place wooden shims behind the hinges, under the legs of the frame, or between the frame and the wall to level the unit out. Use your hammer to check for plumbness before you proceed. Spacing should be equal along the two jambs, and the head of the frame should be level.
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Step 8
Nail the unit into place by placing at least three finish nails into each jamb. Make sure to also put nails through any wooden shims that you used to hold them in place.
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Step 9
Place batt insulation between the jambs and the wall to help weatherproof the opening. Insulation should be loosely packed, not overstuffed.
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Step 10
Install casing or trim pieces around the perimeter of the unit to finish off the look. Remove clips that are holding the door shut, and follow up with a layer of caulk around the perimeter of the unit, both on the interior and exterior of the home.
