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  • Writer's pictureCasey Dominick

A Step-by-Step Guide: How to Measure for Replacement Windows

Contact Dominick Home Services today for help with your window replacement measurements!



Are you planning to replace the windows in your home? Accurate measurements are crucial to ensure a seamless and successful window replacement project. This comprehensive guide will walk you through the step-by-step process of measuring replacement windows. By following these instructions, you'll be well-equipped to order the right-sized windows and avoid costly mistakes. Let's dive in and ensure a perfect fit for your new windows!


1. Gather the Necessary Tools:

- Measuring tape: A retractable tape measure with metric and imperial measurements.

- Paper and pen: To record your measurements for future reference.

- Level and square: These tools will come in handy for checking the squareness of existing windows and frames.


2. Determine the Type of Replacement Window:

- Identify the window style you intend to replace, such as single-hung, double-hung, casement, or sliding windows.

- Consider any specific features or customization options you desire, like grid patterns or built-in screens.


3. Measure the Width:

- Start with the inside width of the window opening.

- Measure from the inside of the left jamb to the inside of the right jamb.

- Take three measurements: at the window opening's top, middle, and bottom.

- Record the smallest measurement, as this will ensure a proper fit.


4. Measure the Height:

- Measure the inside height of the window opening.

- Measure from the bottom of the sill to the top of the jamb.

- Take three measurements at the window opening's left, center, and right.

- Record the smallest measurement.


5. Measure the Depth:

- Measure the depth of the window opening, also known as the jamb depth.

- Measure from the inside edge of the window frame to the outside edge.

- Note this measurement to help determine the appropriate window frame thickness.


6. Check for Squareness:

- Use a level and square to verify if the existing window opening is square.

- Measure the diagonals of the window opening from corner to corner.

- If the diagonals are equal, the opening is square. If not, take note of the larger diagonal measurement.


7. Consider Additional Measurements:

- If you plan to replace the entire window unit, measure the overall dimensions of the existing window, including the exterior trim.

- Measure the distance between the top of the window opening and the ceiling and the distance from the bottom of the window opening to the floor.


8. Repeat the Process for Each Window:

- Repeat the measurement process for each window you intend to replace.

- Even if windows appear identical, measure each individually, as slight variations may exist.


Accurate measurements are the foundation for a successful window replacement project. By following this step-by-step guide, you'll be equipped with the knowledge to measure your existing windows correctly. Remember to measure the window opening's width, height, and depth, check for squareness, and consider additional measurements for a comprehensive understanding of your replacement window requirements. Armed with these measurements, you'll be ready to order the perfect-sized replacement windows and proceed confidently with your project. Enjoy the process of transforming your home with new windows that fit like a glove!

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