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Get It Right The First Time: Why Replacement Windows Should Be Measured By Professionals

If you are considering replacement windows for your home, you may be thinking… how hard is it?  I can do it myself! Although a DIY route may seem like the most cost-effective, reasonable solution, unless you have extensive home repair experience, installing replacement windows on your own can end up being a costly mistake. 

Truth be told, hiring professionals to replace your existing windows typically saves time, money, and frustration.

How to Measure Replacement Windows (Hint: Let The Pros Do It!)


When measuring for replacement windows, you must measure with precision but there are some tricks to the trade. Knowing and utilizing these tricks are the difference between properly fitting windows and a renovation nightmare. 

One common mistake you may make is to fail to take off ¼-½ inch of each measurement to ensure the new window will slide in and fit properly. Another common mistake is to take one measurement. You should measure the top, middle, and bottom to make sure that your window opening is square. 

If you find that your DIY replacement windows are too big for the opening you likely have an expensive problem. First of all, don’t force the window. It will break. No window warranty covers forcing a window into a space that is too small. You will either have to return your windows and get the correct size (likely at your own cost) or resize your opening. Resizing your opening presents a whole slew of other issues and certainly a path you want to avoid all together.  


Yes, when measuring you need to take off ¼ to ½ inch to ensure a proper fit for the window but what if you order windows that are just a tad too small? Sure, you can fix the aesthetics (larger trim, shims, etc) but that does not solve the structural issue of installing windows that are too small. 

Some serious issues of installing a replacement window that is too small can include: 

Malfunction: Improperly sized windows don’t usually function properly. They may not stay open or closed and the locks may not be effective. This may not be an immediate issue but over time, as the window has room to move in the opening, these issues will be more pronounced. 

Mold and rot: Improperly fit windows with extra space are prone to develop leaks. Leaks lead to mold, mildew, and rot — often unseen and undetected until there is a costly issue. Safety: If your window is not properly anchored, it could fall out during a jar or an earthquake.


Our professional installers have seen just about every scenario possible and they know how to prevent most issues. Our installers go through the Installation Masters Training and Certification Program, which is a nationwide program committed to teaching installers proper techniques. This experience gives Newman Windows and Doors the unique ability to warranty every job at every home. Not only will your new window installation look beautiful, but it will also give you the peace of mind knowing that it is properly installed so the windows will function and last. 

Working with a company you can trust really does make a huge difference in the end.  Download our complimentary Transparency Guide for more information.

In the case of replacement window installation, there really is no alternative to a professional installation. You will likely save money and frustration but there is also a priceless value in the peace of mind you get from working with a company that is knowledgeable and that stands behind their work. 

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