If you’re thinking about replacing your windows but aren't quite ready to call a contractor, measuring your windows can be a first step to more informed shopping. Let's dig in!
Before you start, you’ll want to gather a tape measure, pen, and paper. It can be useful to have a helper too, especially if you have large windows.
Tip: To help you track dimensions and make other necessary assessments, download one of our measurement guides, like this one for the 400 Series.
You also need to understand a few different parts of a window before taking measurements. These include:
The first thing you’ll want to do is check and make sure your windows are in square alignment. This means all four corners meet at 90°. To do this, you’ll take two diagonal measurements from inside your home.
If the measurements are within 1/8 inch of each other, your windows are square.
It’s useful to understand whether or not your windows are in square alignment for several reasons.
Take this measurement from inside your home. Measure from jamb to jamb or drywall to drywall if you don’t have trim around your windows. Round down to the nearest 1/8 inch, and measure from three different spots: near the top, at the center, and near the bottom.
Use the smallest measurement as your width dimension.
Tip: As you're measuring, you might want to note:
This information will help you communicate your needs when window shopping and get a good sense of the cost right off the bat.
Again, measuring from inside your home, you’ll measure your window’s height from head to sill. Measure to the nearest 1/8 inch in three different spots: left, center, and right
Use the smallest measurement as your height dimension.
With the measurements you’ve taken, you’ll have the basics needed to begin comparison shopping. If you're considering replacing windows yourself, check out the FAQ section below.
Ready to take the next steps in your window selection process? We’ve got the tools you need to start envisioning your perfect windows. We can also help you find the right professional.
