If you’re in the process of updating your home’s windows, you’ll know that the options can seem pretty endless which makes choosing your perfect windows a little trickier. Among the many decisions you’ll need to make, one key thing to think about is whether you want to choose traditional casement windows or go for the newer flush casement style 

While both types of windows offer similar performance and security features, the price difference between the two can be surprising, leaving many to wonder exactly why there’s such a difference. The price difference between standard casement windows and flush fitting casement windows depends on the size and quantity needed. Generally, flush casement windows are considered the premium option due to their advanced design features. 

So, why exactly are flush casement windows more expensive? And what should you choose? 

Appearance matters 

One of the main reasons you’ll notice a price difference between casement and flush casement windows is due to their appearance. A regular casement window is ‘lipped’, with the openable parts protruding from the frame, while a flush casement window lies flat in line with its own frame. What does ‘lipped’ mean? When viewed from the side, a lipped window shows that the openable parts (or casements) extend slightly beyond the frame. If you find this protruding edge appealing, you should opt for standard casements. 

Flush casement windows have a really sleek look—they sit perfectly flush with the frame on the outside, hence the name! It gives them this clean, seamless look compared to traditional casement windows that a lot of people love.  

The exterior appearance of flush casement windows can also help to improve the curb appeal of a property. Since they don’t have any parts sticking out, they create this smooth, modern look that can give your home a whole new look. This isn’t to say standard casements are unattractive, just an option.  

Installation complexity 

The difference between casement and flush casement windows isn’t just about looks—it also affects how they’re installed. Installing flush casement windows takes a bit more time and precision compared to traditional ones. 

Since flush casement windows have that sleek, flush exterior, getting a perfect fit during installation is super important. They don’t have as much wiggle room as traditional windows, so any misalignment or gaps between the glass and frame can mess with both the appearance and performance of the window. That’s why installers need to be extra careful with measurements and alignment when putting in flush casement windows. 

Plus, you’ve got to think about those sightlines around the window opener to keep that clean, uninterrupted look of flush casement windows intact. Because of all this precision needed for installation and upkeep, it’s usually best to leave it to the pros (that’s us!) who have experience with flush casement windows. And since finding those experts can be a bit trickier, it often means a slightly higher cost for getting flush casement windows fitted. 


When it comes to maintenance, both casement and flush casement windows need some love to keep them looking their best and lasting for as long as possible. However, flush casement windows might need a tad more attention. Since they have that sleeker design, cleaning can be a bit trickier without any frames sticking out to catch debris or dirt. Plus, it’s a good idea to keep an eye on those internal seals to make sure no air or moisture sneaks in, which could mess with the window’s performance over time. 

Heritage properties 

While casement windows don’t have many disadvantages, they might not be the best fit for your home. For example, if your property features sash windows throughout, a casement window could appear out of place. This consideration isn’t specific to casement windows but is something to keep in mind when shopping for new windows.

If you live in a heritage property, pay close attention to your existing windows. Legal restrictions might limit your replacement options. For listed homes, you typically need to replace windows with similar styles unless an alternative can blend seamlessly with the original architecture. 

Final thoughts 

In the end, whether you go for casement or flush casement windows is all about what works best for you; your budget, what looks good to you, and what matters most when it comes to installation, upkeep, and how they perform over time. So, take your time thinking about what matters most to you, speak to our advisors, and you’ll find the option that ticks all the boxes and adds that extra something to your home for years to come. 

At Birmingham Glass, our experienced team has years of industry expertise. We’re here to answer all of your questions and guide you in making the right choice for your home. Whether you’re considering casement or flush casement windows, we’ll help you find the perfect windows to suit your needs, preferences, and budget! 


Contact us today for a chat and a no-obligation quote (if you want one)!