Beginner Step-by-Step Guide to Measuring Doors

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1. Measuring Internal Doors

When it comes to measuring internal doors, you want to be precise. Start by following these simple steps:
  • Height Measurement: Measure the height from the floor to the top of the door. It's best to measure at three different points: at the left, middle, and right. Choose the shortest measurement.
  • Width Measurement: Measure the width of the old door at three different points (top, middle, and bottom) and use the smallest figure.
  • Thickness Measurement: Check how thick your door is, generally between 1 3/8 inch to 1 3/4 inch.
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    2. External Door Measurements

    For external doors, the process is similar but includes a few additional considerations:
    • Weather Stripping: When measuring from the outside, consider any exterior elements like weather stripping or molding that may add to the width or height.
    • Height and Width: Measure the height and width using the same methods as for internal doors.
    • Rough Opening: Don’t forget to measure the rough opening (the opening in the wall) to ensure your new door will fit correctly.
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      3. Door Frame Measurements

      Accurate door frame measurements are crucial, especially when replacing a door. Here’s how you do it:

      • Frame Height: Measure both the left and right sides of the frame from the floor to the top.
      • Frame Width: Check the width at the top, middle, and bottom of the frame. Make sure to consider whether there are any obstructions.
      • Depth of Frame: This is the distance from the inside to the outside of the frame.
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        Pre-Hung Door Measurements

        If you’re purchasing a pre-hung door, understanding pre-hung door measurements is essential. This type of door comes already attached to a frame:

        • Measure the Frame: Use the same steps you used to measure the old frame, ensuring your new door fits perfectly.
        • Jamb Width: Check the jamb width to confirm it matches your wall thickness.
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          DIY Door Measuring Tips

          Here are some DIY door measuring tips to help you along the way:

          1. Always use a reliable tape measure for accuracy.
          2. Double-check your measurements—measure twice, cut once!
          3. Take note of any screws or hinges that might protrude from the door when measuring for new installations.

              How to Measure a Door for Hinges and Locks

              When you are measuring a door for hinges and locks, these steps will guide you:

              Hinge Placement: Typically, hinges are placed 7 inches from the top and 11 inches from the bottom of the door.
              Lock Placement: For the lock, the standard height is often around 36 inches from the floor, but adjust according to your preference or any previous installations.

                Measuring Old Doors for New Installations

                When measuring old doors for new installations, ensure you have the following:

                Measuring for Internal vs External Doors

                Internal doors are generally simpler in design, so measuring for thickness and frame dimensions can be straightforward.
                External doors often require more attention to insulation and weather stripping.

                    Pro Tip: If you’re unsure, it can be helpful to take a photo of your old door and its dimensions to bring to the store.

                    Door Size Chart and Standard Door Sizes

                    Before making a purchase, familiarize yourself with a door size chart. Here are some standard door sizes you might encounter:

                    • Interior: 24, 28, 30, 32, and 36 inches in width by 80 inches in height.
                    • Exterior: 32, 34, and 36 inches in width also typically with a height of 80 inches.

                      Conclusion

                      Achieving accurate door measurements can be a game-changer in your home improvement project. With this guide, you're well-equipped to tackle measuring for a new door—whether internal or external. Remember, the key is to be meticulous, take your time, and don’t hesitate to ask for help if you need it. Happy measuring!

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