Flush Casement Windows 2026 Costs & Guide
A uPVC flush casement window typically costs £300–£900 supplied and fitted per window in 2026, depending on size, colour and glazing; timber and aluminium cost more.
Dating back to as early as the 15th century, flush casement windows became an integral part of the UK’s physical and cultural landscape. Actually, you might have even seen one already!
Now, you must be wondering: what exactly are flush casement windows and what’s so great about them?
Well, this is a complete guide to all the information you’ll need, and it might even convince you to get one for your own home.
To get started, here are a few important things that you need to take note of:
- Flush casement windows are different from casement windows because they are not lipped, unlike their standard counterpart.
- They can benefit your home through the excellent versatility and high security they offer, whilst being sustainable through their commendable energy efficiency and thermal retention.
- There are multiple material options for this window style which you can choose from, depending on your budget and preferences.
In this guide you’ll find
Casement Windows VS Flush Casement Windows
Before anything else, did you know that the term ‘casement’ refers to the part of a window that opens? If you’ll notice, this is the opposite of picture windows or windows made out of glass that do not open.
Most casement windows open completely, allowing more air to pass through. This characteristic also differentiates them from sliding windows since the latter only opens halfway.
Now, let’s dive into the differences between a casement window and a flush casement one.
What are standard casement windows?
Also called storm casement windows, this window style is a single or double-panelled window that can be identified by its top or side hinges. They also tend to have a sub-frame that allows them to open. However, this would mean that they are smaller than the opening they’re installed with.
It’s no wonder that it is loved by many, given that it’s a cost-effective window style that can be easily paired up with other types. They are also highly insulative, perfect for the UK’s ever-changing weather.
What makes flush casement windows different?
While they may look similar at first glance, one main difference is that flush casement windows are not ‘lipped’. This means that when this window style is closed, it sits flush with the frame. This creates a smooth look from the outside without any overlap.
These windows do not protrude at all and provide a completely flat surface, in comparison to its more traditional form. Basically, it’s an innovative and modern yet elegant twist on the standard casement window style.
This window style also goes by the name of flush sash casement windows.
However, they shouldn’t be confused with sash windows because that is another window style altogether. The term ‘sash’ actually refers to the part of the window that can be opened, closed, and tilted to allow for ventilation and access to the outside.
Sash windows are traditionally made with two panels that slide over each other via a pulley system. They can be opened vertically or horizontally through the movable panels, which are also called sashes.
A sash, on the other hand, is a key component of a window frame which is used to hold the glass panes in place. It is the movable part of the window that is designed to be airtight when closed to prevent leaks and drafts.
Look at it this way:
| Sash Window | Window Sash |
|---|---|
| ● Window Style ● Does not open with a hinge ● Slide vertically or horizontally | ● Window Part ● Movable part of the frame ● Contains the glass panes |
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Benefits of Flush Casement Windows
If you want to know the benefits of installing flush casement windows, you’re in luck! This article will answer just that.
They bring a lot of great qualities to the table, with some of them being its low maintenance requirement and improved security.
To help, here’s a summarized list of its pros and cons:
| Pros | Cons |
|---|---|
| ✔ Aesthetic design ✔ Opens fully for maximum ventilation ✔ Versatile and durable ✔ Noise-reducing | ✗ Higher cost compared to standard casement windows ✗ Limited in terms of the glazing weight they can carry |
Versatility
One thing that holds most people back from trying out a new window style is that they’re afraid of whether it will suit their current property.
Are you one of them?
Well, you won’t have to worry for long, because these windows can be custom-made and tailored to fit your current home.
As one of the more versatile window designs, it is suitable for any architectural style. Flush casement windows bring a more stylish and trendy aesthetic to contemporary homes. Conversely, they can also upgrade the elegance and classic feel of period properties.
Different manufacturers also offer multiple features to further enhance the overall look. Most offer an extensive range of woodgrain options and a variety of sophisticated colours. They can also be fitted with Georgian bars or a sculpted profile to add to the authenticity.
Low Maintenance & Durability
This type of window can be extremely easy to maintain and kept in pristine condition with only minimal upkeep.
In fact, some window frames will only require being wiped down with a damp cloth to stay clean, and won’t ever need to get re-painted or varnished.
Flush casement windows are also extremely durable, especially when made with the right materials. For example: uPVC and Aluminium window frames are weather-resistant. Additionally, they can be combined with double or triple glazing for maximum efficiency.
Choosing modern materials can help ensure that your windows will never warp, peel, or flake so that you can enjoy them for the rest of the years to come.
Security
Most manufacturers typically include a more advanced, multi-point locking system for flush casement windows, in comparison to its standard version. The multi-locking mechanism feature also engages in several areas around the frame, creating a high level of security for your home.
They also have fewer leverage points, implying that there is a lesser risk if one area gets broken. With these features, you can sleep more peacefully at night knowing that you and your loved ones are protected.
This window style can also help reduce outside noise due to its solid construction and tight seals. Flush casement windows are best paired with double or triple glazing for maximum efficiency and higher protection from noise pollution.
They are especially ideal for houses located in busy or urban areas. If you currently live in one, you might want to consider getting this type of window.
Important Note
You can only be able to ensure that you utilize and maximize it to its highest potential if you choose the right manufacturer.
Keeping Your Windows Sustainable
If you’re wondering: are flush casement windows sustainable?
The answer is yes!
They can provide excellent energy efficiency and thermal retention to your home, especially when equipped with double or triple glazing.
Window glazing is the glass inside of a window which can be single, double, or triple. It can reduce the amount of heat transfer from the house to the outside and vice versa, and contributes to the window’s impact resistance.
Here are some of the factors that make flush casement windows sustainable:
High Energy Efficiency Rating: This window type has an A energy rating and a low U-value, which means that they have low heat loss and high energy retention.
Durable Weather Seals: Its tight-fitting flush design blocks out cold air to eliminate draughts and prevents rain from seeping in.
Lower Energy Bills: Installing flush casement windows can greatly reduce your energy bills so you spend less money on heating your home.
Material Options
There are tons of material options available for your flush casement window, but what are some of the most recommended ones? This list will help you pick a frame material that will cater to your liking and preferences while keeping budget and sustainability in mind.
uPVC Flush Casement Windows
As one of the most popular frame materials in the UK, uPVC has many benefits such as its affordable prices and high durability. It also doesn’t require high maintenance upkeep just to stay in its optimal state.
What’s more, uPVC flush casement windows are easily customizable and most stores offer them in a wide range of colours.
If you would prefer a more traditional look, some stores offer designs that mimic the style of wood. Meanwhile, others also offer single and dual-coloured window options.
This frame material is also highly recommended for its great thermal performance and energy efficiency.
| Size | Estimated Cost |
|---|---|
| 600mm x 900mm | £410 – £910 |
| 900mm x 1,200mm | £450 – £960 |
| 1400mm x 1400 mm | £480 – £1075 |
Keep in mind that these prices are averages, so you should compare these with Ecopreneurist to know the most updated price estimates.
Timber Flush Casement Windows
For a timeless style that will add charm and character to your property, this beautiful combination mixes the elements of traditional quality and modern design.
Though it is one of the more expensive material options, it has many redeeming qualities such as its extremely high durability that can last for up to 60 years, with the right maintenance and upkeep.
Timber window frames also provide great energy efficiency due to their natural insulating qualities, while providing increased safety and security to the homeowner.
| Size | Estimated Cost |
|---|---|
| 600mm x 900mm | £315 – £1290 |
| 900mm x 1,200mm | £390 – £1385 |
| 1400mm x 1400 mm | £450 – £1615 |
Aluminium Flush Casement Windows
If you would prefer a sleek-looking frame, this might just be the one for you!
Known for its modern design aesthetic, aluminium flush casement windows fit easily into contemporary homes. Most are manufactured with slimline flush-fit frames, complete with narrow sightlines and wider glazing panels.
This type of material is also highly durable and easily resistant to corrosion. Along with it being thermally efficient, due to its thermal break technology, some stores also offer environmentally friendly options made from 100% recyclable materials.
| Size | Estimated Cost |
|---|---|
| 600mm x 900mm | £460 – £1540 |
| 900mm x 1,200mm | £510 – £1640 |
| 1400mm x 1400 mm | £550 – £1870 |
Compare these estimations with Ecopreneurist to get the updated prices on timber flush casement windows.
Composite Flush Casement Windows
This frame material is made from a composite material that uses both timber and aluminium.
It is commonly made with a timber exterior and aluminium internal cladding, which mixes the best elements from the two materials: the aesthetically pleasing design of timber and the high durability of aluminium.
However, be warned that they will cost more than windows made from just one of the two materials.
| Size | Estimated Cost |
|---|---|
| 600mm x 900mm | £500 – £1600 |
| 900mm x 1,200mm | £990 – £1770 |
| 1400mm x 1400 mm | £1250 – £2500 |
So, what’s so great about Flush Casement Windows?
In short, flush casement windows are a great choice for both period pieces and contemporary homeowners alike. They have a lot of potential which you can craft and mould towards your preferences and liking.
Remember to use Ecopreneurist to compare the most updated prices on your chosen material before making a final decision.
With its multiple, sustainable features and versatile design, flush casement windows could be a great addition towards your journey in achieving your dream home.
Do flush casement windows come in different styles and finishes?
Yes, flush casement windows are available in various styles and finishes to suit different architectural designs and preferences. They can be painted or stained in different colours to match the overall aesthetic of a property.
Are flush casement windows easy to maintain?
Generally, flush casement windows are relatively easy to maintain. The choice of materials can influence maintenance requirements. For example, uPVC windows are low-maintenance, while wooden windows may require periodic painting or sealing.
Are flush casement windows suitable for traditional and modern homes?
Yes, flush casement windows are versatile and can complement both traditional and modern architectural styles. The clean lines of flush casement windows make them suitable for various types of properties.
Do flush casement windows provide good security?
Flush casement windows can be equipped with modern locking systems to enhance security. It’s important to choose high-quality hardware and ensure that the windows are installed by professionals to maximize security.
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