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How To Measure For A Replacement Window In 5 Simple Steps

Do you want to replace your old windows but are unsure of how to accurately measure for replacements?

You’re not alone, as many homeowners find this task daunting. Our article simplifies the process into five easy steps, ensuring a perfect fit for your replacement windows.

So, let’s dive in and reduce those measurement worries today.

man taking measure of window for blinds installation at home

Key Takeaways

5 Simple Steps to Measure for a Replacement Window

Beginning with a simple check for square, these five steps are designed to guide homeowners through the process of accurately measuring their existing window frame in preparation for replacement.

The designated method includes taking ample width measurements from different parts of the window and diligently capturing height measurements from three designated points. Measuring window depth is just as crucial, ensuring your new construction windows fit perfectly into the existing frame.

One should conclude the process by thoroughly checking all recorded measurements before placing an order for custom windows; this avoids erroneous purchases and ensures the perfect fit during replacement window installation.

Service man measuring window for installation indoors, closeup

Step 1: Check For Square

Determining if your existing window frame is square is the initial task at hand. Start by placing a carpenter’s square in all corners of the window. If it fits snugly, you’ve got a true “square”; however, if there are gaps between your tool and the frame edge, adjustments will need to be made accordingly for accurate replacement window measurements.

This step ensures an appropriate fit while avoiding those pesky air drafts that can lead to energy inefficiency in your home.

Step 2: Measure Window Width

Begin the process of measuring window width from inside your home. Take a tape measure and stretch it across the window from one side to the other. Ensure to take measurements at three main points: top, middle, and bottom.

The crucial step involves taking precise measurements from where the vertical trim boards meet around your existing frame on each end. Focus more on accurate figures rather than rounding numbers up or down since replacement windows require exact fittings.

The smallest reading among these three measurements determines the true window opening width, which is vital in ordering custom windows for your home improvement project, such as energy-efficient ones!

Step 3: Measure Window Height

To measure window height, start from the top of the windowsill to the bottom of the head jamb. Use a tape measure for this process and ensure it’s completely straight. It’s critical that you get an accurate measurement so your replacement windows will fit well.

To prevent any mistakes, repeat this step three times—at the left side, center, and right side of your existing window frame—and keep a record of each measurement.

Using these height measurements helps determine if your current frames are square and ready for new windows or if some additional adjustments need to be made before proceeding with your home improvement project.

Step 4: Measure Window Depth

Take your tape measure and position it at the lowest part of your window sill, assessing from the front plane to the existing frame’s innermost point. Ensure you report this measurement, marking the shallowest depth if there are variations within openings.

Using an angle measuring tool can help attain accurate measurements for windows with sloped sills. No matter your windows’ shape or size, taking precise estimates of their depths is vital in selecting a perfect fit for replacement windows.

Careful observation while executing these steps will spare homeowners from costly mistakes when purchasing new construction or replacement windows.

Step 5: Order Your Replacement Windows

After taking all the necessary measurements, proceed to order your replacement windows. Look for reputable dealers and manufacturers with positive customer service reviews. Ensure that you provide your exact specifications to avoid any sizing issues during installation.

While selecting new replacement windows, consider factors such as energy efficiency and the style that matches your property’s aesthetic. Don’t hesitate to ask questions if any; most window companies have experienced technicians ready to assist in ensuring it is a seamless home improvement project.

Discuss delivery timelines so you can plan ahead for successful replacement window installation without inconveniences or delays.


Expert Tips for Measuring Replacement Windows

Getting accurate measurements for your replacement windows is crucial. Here are some expert tips to ensure precision:

  1. Always use a steel tape measure. They provide more accurate measurements than cloth or plastic tapes.
  2. Start by measuring the window frame’s width from jamb to jamb, ensuring to take three measurements – from the top, middle, and bottom of the existing window frame.
  3. Similarly, measure the height from the head jamb to the sill in three places – left side, center, and right side of the window.
  4. For depth measurement, hold the tape measure against the left double-hung window track’s vertical part and proceed towards the right outer track’s vertical part.
  5. If there are varying numbers in multiple windows or between your three measurements of a single window, always record the smallest size you measured for replacement windows.
  6. Even if you have seemingly identical windows around your house, measure each one individually, as minor differences can impact fitting.

DIY vs Professional Window Measurement: Pros and Cons

Deciding whether to measure your windows yourself or hire a professional can be a tough decision. It’s important to understand the pros and cons of each option to make an informed choice.

Type Of Measurement Pros Cons
DIY Window Measurement
  • Cost-effective as no professional fees are involved.
  • Gives you complete control over the process.
  • Allows flexibility on when measurements can be done.
  • Experts take precise measurements, reducing the risk of errors.
  • Professionals are familiar with different window styles and sizes.
  • They can identify potential issues that could impact installation.
  • Professional Window Measurement
  • The risk of inaccurate measurements can lead to improper fitting.
  • May not be aware of certain specifics needed for different window types.
  • Potential to overlook problems that could affect the new window installation.
  • Can be costly as professional fees are involved.
  • Need to schedule an appointment, which might not be convenient.
  • Less control over the process as professionals handle everything.
  • The choice between taking DIY measurements or hiring a professional ultimately depends on your budget, skill level, and comfort with the process.

    Measure For Replacement Windows FAQs

    To measure for new window frames, you need to measure the width, height, and depth of the existing frame.

    • Width: Measure the distance between the sides of the frame where the vertical trim boards meet. You should take measurements at three points—top, middle, and bottom. The smallest reading is the width you’ll use for ordering your new frame.
    • Height: Measure the distance from the top of the sill to the bottom of the head jamb. Again, take these measurements at three points—left, middle, and right. The smallest reading is the height you’ll use.
    • Depth: Measure from the front plane of the frame to the innermost point. This can be done at any point of the frame where there are no obstructions.

    Remember to always use a steel tape measure for accuracy and note down the smallest measurements in case of any variations. This will ensure a snug fit for your new window frames.

    A steel tape measure is primarily used to measure windows. This tool offers the most accuracy, especially when considering window replacement.

    It’s critical to get precise measurements to ensure that the replacement windows fit perfectly into the existing frames.

    Any inaccuracies can lead to windows that don’t fit correctly, which can make the window ineffective at insulating your home and can lead to unnecessary additional costs. In addition to a steel tape measure, a level can also be useful to ensure that the window frames are square.

    Furthermore, a writing tool and paper or electronic device are needed to record the measurements. The measurements should include the window’s width, height, and depth, taken from various points as discussed earlier.

    To measure a window sash, first measure the width from the left side of the sash to the right side. Then, measure the height from the top of the sash to the bottom. Always use a steel tape measure for accurate measurements.

    No, most window screens are not a standard size. While there are common sizes used in many window constructions, each window manufacturer and style may have unique dimensions.

    It’s vital to accurately measure your window frame if you need to replace or install a new screen. Measure the width, height, and depth of the window frame where the screen will be placed, and note down the smallest measurements in case of any variations.

    It’s always best to provide these exact measurements when purchasing a window screen to ensure a perfect fit.


    If you’re in need of expert window replacement services, look no further! At High Sierra Remodeling & Construction, we offer the best window replacement solutions in Reno, Sparks, Sun Valley, and throughout Washoe County, NV.

    Our team of professionals will ensure accurate measurements for a seamless, hassle-free installation. Don’t settle for anything less than perfection when it comes to your home. Reach out to us today at (775) 242-6405, and let us provide you with the quality service you deserve.