how to measure for replacement windows

How to Measure for Replacement Windows in Your Home

The size of your window matters when you want to replace them. Once you decide it’s time to get replacement windows for your home, measuring them is the next step to take. It might seem a simple thing to do, but there are a lot of measurements to consider.

All of the dimensions have to be exact because it’s vital information that will get you the right sized windows and an accurate quote from your replacement windows specialist. And to get it right the first time, here’s what you have to do.

Step 1: Horizontal Measurements

Take out your measuring tape to measure the horizontal dimensions. To do this, you will need to measure the horizontal distance from one side jamb to the other (from side to side). Start from the top of the window and take three measurements (top, middle, bottom).

Once done, mark the smallest of the three figures. It is known as the rough opening measure for width, which serves as the primary dimension when buying a replacement window.

Keep in mind; it’s also the first measure to list when writing down the size of your replacement window – the rule is always width-height-depth.

Step 2: Vertical Measurements

To measure the vertical size of your replacement windows, put one end of the measuring tape at the top of the window (head jamb) and move it to the bottom (window sill). The distance from top to bottom is the height of the window.

Again, measure it three times as you did with width, but this time from side to side. Circle the smallest measurement to figure out your rough opening height, and write it down.

In case you have a sloped window, take the vertical measurement from the uppermost part of the window sill to the loftiest point of the head jamb (both are usually against the window).

Step 3: Measure Depth of the Window Opening

Depth is the third and final measurement you have to take. Run the measuring tape from the outside to the inside edge of the window frame.

Unlike before, you will have to do this several times (eight or more) at the bottom, top and sides of the window frame. And once again, mark the smallest measurement, as this is the rough opening depth.

If you are unable to open the window or it’s fixed, measure the depth from the side of the window pane and determine the thickness of the glass (usually 1/8″ per pane or written in the corner), and then add those three figures together.

Getting an accurate depth measurement is critical since the windows can be too thick to fit inside the gap for the replacement window.

Want to Get It Done Right the First Time?

At 1-800-HANSONS, our team of highly trained experts can do all the hard work for you. From the initial appointment to the installation, we can help you measure, decide and get it done right the first time. Contact us to request a FREE estimate or schedule a meeting right away.