How to Measure for Replacement Windows

You may have seen that I’ve been mulling over what is and isn’t worth renovating in the home recently, but if there’s one thing that’s always worth looking at, it’s windows. Recently I worked out a fun way to use window film to help my office space, but I also know how important replacing windows can be long-term. If you’re thinking along similar lines, let’s go over the basics of how to measure for replacement windows.

Why Choose to Replace Your Windows?

We all know that windows are essential. More than that, it’s important that they last and that they insulate well. Depending on the situation you may not have to replace the full window. For instance, you might just have panes that could do with being replaced, or maybe it’s some window replacement handles you’re after.

Windows are vital in giving decent light and, when integrated well into your space, can help keep energy costs low. However, windows also play more of a role than we sometimes realise in the visual appeal of our homes. As such, aesthetics are another thing to keep in mind if you’re looking into getting some replacement double glazing.

When I covered my home office window’s glass with window film, it was still really important to me that I had plenty of natural light. Likewise, the entire look and feel of a room can be completely changed depending on how you use your windows. In my view, having good, clear panes that let in plenty of natural sunshine and heat come summer, but that also retain heat during winter, is a balance that’s always good to strike.

However, all of this is tied to making the right measurements in the first place. Get that right and the hard part is more or less out of the way. Plus, do consider how you’ll get rid of the old windows too.

The Importance of Precise Measurements

As windows are a core part of your home’s structure and are responsible for preventing draughts or letting heat escape, measurements need to be made with no margin of error. Badly fitted windows could come loose over time, become damaged in poor weather or simply leave gaps that leave your home potentially at risk. As such, I can’t stress enough how important accuracy is in window glass replacement.

Mistakes will prove extremely costly. When you buy windows, you’re essentially buying a made to measure product. So if your measurements are incorrect, many companies won’t refund the delivered product. You could be stuck with a useless window and may even have to splash out again to get it right.

With that in mind, let’s go through a few procedures that should help you get your measurements right.

How to Measure for Replacement Windows

It’s often best to begin measuring your window’s width, with the best advice suggesting measuring the width three times down the window’s length and using the smallest measurement. From there, you should also account for the lining of the window too.

Measure the height in this way too, three times along the width of the window and using the smallest measurement as your guide. The depth of the window can be measured similarly, and this is definitely easier to do if your window opens.

Safety is also important, especially if you’re measuring upstairs windows or windows in areas that are difficult to reach. To be honest, I’d be happy to hand the measuring over to a professional, particularly if it’s any inaccuracies will cost me money.

You’ll be able to do the same if you choose a reputable company, as all the best window replacement specialists offer measuring and even disposal of the old windows in their packages.

There’s definitely no shame in leaving this kind of thing to the experts, especially if it guarantees a safe and secure home and prevents any costly measuring mishaps.


I know from experience that quality and value are two key focuses when it comes to finding the best double glazing and replacing your windows . Professionally fitted windows will last a good 25 years or longer, barring any accidents. That’s not bad going for one payment.

When making your window measurements remember the rule of three to avoid any errors. Those three measurements help to accommodate things like any small variances in the frame or other factors too small for the naked eye, but still vital to take into account. Again, if this is all too daunting, professional fitters will do the job for you.

When moving forward with your window replacement plans you may well be surprised at the choice on the market. That goes for the finish too. Will you go for standard white uPVC or the slightly pricier, but more aesthetically pleasing, woodgrain finish?

And more broadly, are you replacing your windows for general home maintenance, or to spruce up a room? Is it to better insulate your home or help with long-term energy conservation? Either way, don’t cut corners and get the professionals involved if you need to. This is one part of your home where you get what you pay for; do it well and you won’t need to bother with it again for years to come.

And of course, once you’ve got this right it’s time to find the perfect window dressing. Whilst curtains are still popular I’m still a big fan of ordering my blinds online. How about you?

What do you think? Have you ever undertaken a window replacement project solo? Are you thinking of revamping the windows in one of the rooms in your home? I’d love to hear your thoughts.


If you are about to buy replacement windows, and plan to measure for them yourself, be careful! If you get it wrong it can cost you a LOT of money. Click through for the guide on how to measure for your next set of replacement windows accurately #lovechicliving #renovationtips #newwindows

Commissioned Post

Images: Large windows || Living room windows via Shutterstock

Jen Stanbrook
Jen Stanbrook

Jen is an award winning digital publisher and has been creating interiors and home decor content for over 10 years.
She has an insatiable love of home interiors, has worked with hundreds of brands, and currently supports many bloggers within the creative industries to share their expertise through writing.
She spends most of her time in her little garden office pod, has 2 daughters and 2 (fighting) cats.

Find me on: Web | Twitter | Instagram

1 Comment

  1. carolyn
    April 22, 2018 / 10:20 am

    I love the size of the windows in that lounge room. Theymust let in so much natural light!

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