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How To Measure A Window For Replacement

December 13, 2021

Are your windows looking a little worse for wear? Perhaps they lose heat too easily and drive up your energy bills? If so, it’s time to invest in a set of shiny new windows.

Of course, you’re unlikely to be able to
install window replacements by yourself. To achieve the best results, you’ll need to call in the experts and shop around for a quote that suits your budget. What’s more, you’ll need to provide your chosen tradespeople with accurate window measurements to obtain an accurate quote.

If you’re wondering how to accurately measure a window for replacement, we’ve put together a simple guide below to make the process as easy as possible:

What You’ll Need To Measure Your Window Accurately


You won’t need any special tools to measure your windows accurately. Just makes sure you have a measuring tape, a pencil, and a notebook to hand before you start the job.

Hints & Tips For Accurate Window Measurements


Okay, now you know the basics of measuring a window, how can you ensure you get it right the first time? Here are a few hints and tips for beginners:


  • If you’re unable to open your window, measure the depth on each side of the glass and add these figures together. Then, you can add the thickness of the glass pane of your window. Typically, a single glass pane is around 4mm thick.


  • List your measurements in the following order: Height x Width x Depth


  • If your windowsill slopes at an angle, measure the width of your windows from the lowest point of the sill.

A Step-By-Step Window Replacement Guide


Measuring and recording the precise size of your windows should take between five and ten minutes if you take the following steps:

Step 1. Measure the width of the window frame


Measure the length of your frame horizontally at the top, middle, and bottom points of the outer side of your window. Your measurements should be recorded from the window jambs – you don’t need to consider trim pieces or parting beads. If your window is very tall, take as many measurements as possible to ensure accuracy.

Once you’ve recorded three or more measurements, circle the smallest number and use this when providing final measurements for your window suppliers and installers.


Step 2. Measure the height of the window frame


Next, measure the length of your frame vertically, starting with the left side and moving towards the right side. Take at least three measurements (more if you have a very wide window) and circle the smallest number again. You can ignore any trims, simply measuring the distance between one jamb and another.


Step 3. Measure the depth of your window


Finally, you should measure the depth of your window, running a measuring tape from the outside of your frame to the inside. Take several edge-to-edge measurements around the frame and, again, settle on the smallest measurement as your final figure.

Rely on Roo’s Doors and Windows Maintenance for all your repair and installation needs


Need an urgent window repair or window replacement? Perhaps you’re planning a home makeover project?


Roo’s Doors and Windows Maintenance is here to help. We install a wide selection of windows and doors for property owners across the Sunshine Coast. Get in touch to find out more and book an appointment!

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