How to measure casement windows for replacement?

To measure casement windows for replacement, focus on taking precise width and height measurements from inside the window frame, ensuring you capture the smallest dimensions for a proper fit.

Essential Tools for Accurate Measurement

Before you begin, gather the following tools to ensure precision:

• Tape Measure: A sturdy, metal tape measure for accurate readings.
• Pencil and Notepad: To record your measurements clearly.
• Helper (Optional but Recommended): An extra set of hands can make measuring large windows easier and more accurate.

Step-by-Step Casement Window Measurement Guide

Accurate measurement is critical for replacement windows, as even a small error can lead to significant installation issues. Always measure from the inside of your home.

1. Measuring the Width

For the width, you need to measure the distance across the window opening.

• Begin by measuring from one side of the window frame to the opposite side.
• Crucially, record that measurement to the edge of the sash. This means measuring the actual opening where the window sash sits.
• Take three separate measurements for the width:
  • Across the top
  • Across the middle
  • Across the bottom
• Record the smallest of these three measurements. This ensures the new window will fit even if the opening isn't perfectly square.

2. Measuring the Height

For the height, you'll measure the vertical distance of the window opening.

• Grab your tape measure at the top and pull it tightly down to the bottom of the window frame opening.
• Similar to the width, take three separate measurements for the height:
  • Down the left side
  • Down the middle
  • Down the right side
• Record the smallest of these three measurements. This ensures the replacement window won't be too tall for the opening.

3. Measuring the Depth (Optional but Recommended)

While not always required for ordering, measuring the depth of your window frame can be helpful for understanding the type of replacement window needed (e.g., full frame vs. insert).

• Measure the distance from the interior wall to the exterior siding or brick, indicating the thickness of your wall.
• Take this measurement in a few spots to account for any variations.

Tips for Flawless Casement Window Replacement Measurements

• Measure from Inside: Always measure from the interior of your home, as this is where the new window will be seated.
• Measure the Opening, Not the Sash: For replacement windows, you are measuring the rough opening or the existing frame opening, not the glass or the visible part of the sash.
• Always Use the Smallest Measurement: Window openings are rarely perfectly square. Using the smallest measurement for both width and height guarantees the new window will fit within the existing space.
• Round Down: If your measurements are not exact whole numbers, it's generally safer to round down to the nearest 1/8 inch.
• Double-Check Everything: Go over all your measurements at least twice to minimize errors. Even better, have someone else verify them.
• Note Any Obstructions: Make notes of any trim, molding, or other obstructions that might affect the installation of a new window.

Recording Your Casement Window Measurements

Organize your measurements clearly. Here's an example: