Premier Double Glazing Installer - Cardiff
Casement Windows
uPVC casement windows are popular because of their flexibility in choosing the layout and decorative features. uPVC casement windows are available in a variety of configurations, such as fixed, side-hung, and top-hung, to suit different needs and preferences.
Usually, unless there are reasons to use a different style, such as planning restrictions, most of our customers in Cardiff choose uPVC casement windows. To replace timber windows, they usually choose flush casement windows.
Heath Windows and Doors are the premier suppliers for the best quality uPVC and aluminium casement windows in South Wales. As with all our window and door installations, you can expect the care and attention to detail that comes with fully employing installers for quality control.
Casement Windows for Every Home
Casement windows are the most popular types of windows in the UK.
Casement windows are characterised by the fact that they are hinged, most often on the side, on the top and sometimes on the bottom. Some casement windows are hinged at the top, allowing them to open at the bottom for ventilation and weather protection. The hinge placement is an important aspect of the window’s operation, ensuring security, safety, and ease of use. Fixed casement windows, which do not open, are also available and are ideal for maximising natural light.
Casement windows come in various opening types, including side-hung, top-hung, and fixed, offering a range of options to suit different needs.
No matter which window style you choose, you will have the choice of double glazing or triple glazing.
Flush casement windows are designed for the authentic appearance of old timber casement windows so the window frame is designed to look like wood.
Casement Windows for Security, Style and Superb Noise Reduction
What most homeowners want from their new windows is security, attractiveness and superb noise reduction, and double-glazed casement windows offer all of that.
Once installed, your new windows are low maintenance and are suitable for a wide range of properties, giving a functional yet stylish finish to your home. You know it will be a perfect fit because every uPVC casement window installed by us is made to order.
You’ll also benefit from reduced energy bills and optimum security. You don’t need to worry about building regulations. All our products exceed expected standards backed up by our Certass guarantee.
A Wide Range of Options
The wide range of design options and finishes allow you to be adventurous and stand out or choose a casement window design that sits well with the house without drawing attention. Casement windows can be designed with single, double, or multiple panels, offering a variety of panel window configurations to suit different architectural styles and functional needs.
Designs for casement windows include glazing bars, Astragal bars and Mock horns. The casement window finishes range from woodgrain effects to more solid colours, and there are also various glazing options. You may also further personalise your windows with a choice of window furniture in gold, chrome, white or black.
Ideal for All Properties
The incredibly versatile and functional casement window design is ideal for all types of property. Its functionality lies in its ease of use, adaptability to various configurations, and enhanced performance that meets modern standards. It is the most popular and widely used style of double glazed window in Cardiff, Newport and the Vale and most certainly South East Wales.
Our uPVC casement windows can be either top-hung opening or side-hung opening to suit your requirements, providing excellent ventilation and security. These side-hung windows open outwards to provide maximum ventilation and accessibility. You can choose a flush finish, clean-cut chamfered beading or a more decorative sculpted ovolo finish for your new windows.
Low maintenance, outstanding performance, energy efficiency and easy cleaning are just a few reasons why uPVC casement windows are the most popular window for new builds and older homes.
High-Security Window System
Our double-glazed uPVC casement windows are durable and robust, giving long-life, low-maintenance performance, with no need for painting or other treatments. They are fitted with high-security locking mechanisms too, giving you the peace of mind that your home is well protected against intruders.
Energy-Efficient Design
The multi-chambered frame designs deliver exceptional energy efficiency for both windows and patio doors – helping to keep your home warm and comfortable all year round, as well as reducing your energy consumption. Our slim frames also allow the area of glass in windows to be optimised, maximising the amount of natural light within your home. The energy efficiency is slightly higher on the uPVC casement window than on aluminium but both are A-rated.
Exact Matched Colours
Because the same manufacturer produces all our uPVC frames, we can assure you that all colours are exactly matched across our entire range of window and door products. It means that our whites are the same white across all products and our woodgrain finishes are all perfectly matched. No matter what the age, style or size of your property, we can create high-quality windows to enhance and add value to your home.
Guarantees
Most of our uPVC casement windows come with 10-year guarantees and our aluminium windows have 20-year guarantees. These can vary depending on what you choose but be assured that we partner with manufacturers who give our customers the best in style, durability, energy efficiency and guarantees.
Casement Windows for Bays and Bows
In Cardiff, we have many older homes with bay and bow windows that are fitted with sash windows. This is usually because they already have stone pillars between each window.
Newer properties with bay or bow windows usually have double glazed casement windows with pillars formed from uPVC with aluminium inside for support. A mullion is often used as a central structural element dividing double frame or French casement windows, enabling wide openings when the windows open outward. When you choose your replacement windows, you do not have to replace like with like. We will help you to choose the best option.
We’ve installed so many windows in Cardiff in the last twenty years, we are bound to have examples to show you.
Visit our timber casement windows page.
Aluminium Casement Windows
Aluminium casement windows are often chosen for more modern houses, particularly when the homeowner is looking for a ‘grand designs’ aesthetic, however, many of our customers in Cardiff have chosen aluminium for older houses because of the slimmer frames in smaller windows and because of the durability.
As you would expect, aluminium windows are more expensive than uPVC but we are happy to explore the options with you. We know how important your home is and are happy to take the time to ensure you make the right choice.
We partner with several suppliers including Origin and AluK to ensure that we have a wide range of price points to suit your budget.
Learn more about aluminium windows.
Timber Casement Windows
Discover our extensive collection of timber casement windows and doors, meticulously crafted by Glyngary in Cheshire, to meet your design and specification. Many of our products hold certification from the British Standards Institute for Window Energy Ratings, ensuring optimal energy efficiency and performance.
We also offer a diverse range of timber entrance doors, French doors, and patio doors that can be customized to your unique preferences, all equipped with state-of-the-art locking and security technology. With our advanced pre-finishing process, our timber windows are flawlessly coated using spray-applied microporous paints. Choose from a vast palette of colours or explore over 70 stunning stain combinations to perfectly complement any building or architectural style.
Read more about Timber Casement Windows.
How Secure are Casement Windows?
The lock on our casement window is built to the highest standards of security.
A locking handle is included with every casement window as standard. All of our window ranges feature internal beading. External beading is vulnerable to removal which means that the glass could also be removed.
All of our windows meet the UK standard for security – British Standards Institute (BSI) BS6375-3:2009
How Much do Casement Windows Cost?
The cost of your replacement windows will depend on several factors. The quality of your new casement windows certainly has an effect on the price, both in the materials used and the fixings. The difficulty for you as the customer is knowing the difference. Windows look the same when they are fitted. It’s only in time that you start to see windows dropping because the hinges aren’t sturdy enough or frames bowing because the aluminium or steel inside the frame is not strong enough. The fitting can also make a difference. Your windows need to move smoothly and this relies on level fitting. Unfortunately, the industry is known for sub-contractors who value speed over quality. That’s the reason that as a premier window supplier we fully employ our installation engineers. They know that quality takes precedence and will take their time to ensure the perfect installation
Standard white uPVC casement windows are among the cheapest windows available in the UK, offering affordability without compromising on quality or durability.
Sometimes the perception of cost is related to house value. There is no difference in cost whether you live in Cardiff or anywhere else. A single casement window costs the same whether you have a 2-bed bungalow in the South Wales countryside as it does for a 6-bedroom house in the middle of Cardiff.
Can you Change Sash Windows for Casement Windows?
First of all, let’s consider why you would change your old sash windows for casement. Old sash timber windows are notorious for being sticky to open, especially if they are painted in. If that’s the reason, be assured that new uPVC windows will not present the same difficulties whether you choose sash or casement. Modern glazing moves smoothly and you will find them easy to open and close. Sometimes old sash windows can be stuck, either fully open or partway. This will not happen with new windows either. Both sash and casement will offer super energy efficiency as you would expect from modern uPVC windows.
Modern casement windows also help maintain a dry and comfortable room environment, even in wet climates.
The main reason to change to casement windows is that they look more modern. Some people prefer the way they open or like the flexibility in configurations.
Are Aluminium Casement Windows better than uPVC?
We are just as much fans of uPVC casement windows as we are of aluminium windows. They both have their place in the market and we help our customers choose the right windows depending on the house, their personal taste and the budget. The most popular windows in the UK are uPVC casement windows. Sometimes our customers will choose the same style of windows as the neighbours to help create a cohesive look in the street. Other customers choose windows that are completely different from any other houses because they want to stand out and maybe want a more contemporary look. Get in touch and we will help you make the right choice.
Technical Specifications and Industry Standards
When choosing the right casement window for your property, understanding the technical specifications and industry standards is essential. Our casement windows are engineered using the very latest technology to ensure excellent energy efficiency, security, and durability.
Each window frame is constructed from high-quality uPVC, timber, or aluminium, with options for double glazing or triple glazing to suit your needs. The double glazed glass panels are designed to minimise heat loss, helping to keep your home comfortable and your energy bills low.
All our casement windows come with a multi point locking system as standard, providing robust security for your property. The hinges and hardware are built to withstand Britain’s weather, ensuring long-lasting performance with minimal maintenance. Our windows are available in a range of configurations, including side hung and top hung (awning window) styles, and can be tailored to fit single or double panels, bay windows, and more.
We adhere strictly to UK building regulations and industry standards, including the British Standards Institute (BSI) certifications for security and thermal performance. This means you can trust that your new windows not only look great but also meet the highest benchmarks for safety, energy efficiency, and quality. Full details of technical specifications are available for every product, so you can make an informed choice for your home.
Environmental Considerations
Choosing new windows is not just about style and performance. It’s also about making an environmentally responsible decision. Our range of uPVC, timber, and aluminium casement windows are designed with sustainability in mind. uPVC windows are fully recyclable at the end of their lifespan, and modern manufacturing processes have significantly reduced their environmental impact.
Timber casement windows are sourced from responsibly managed forests, ensuring that your choice supports sustainable forestry practices.
Aluminium windows are known for their durability and can be recycled repeatedly without loss of quality, making them a great option for eco-conscious homeowners.
All our double glazed and triple glazed windows are engineered to deliver excellent energy efficiency, reducing heat loss and helping to lower your home’s carbon footprint. By upgrading to high-performance casement windows, you can create a more comfortable living space while also contributing to a greener future.
We are committed to offering products that not only enhance your property but also help protect the environment. Our windows are manufactured using processes that minimise waste and energy consumption, and we offer a wide range of colour options, including popular choices like anthracite grey, without compromising on eco-friendly standards.
Customer Support
Purchasing your new casement windows online has never been easier. Our website provides a seamless experience, allowing you to browse our full range of styles, configurations, and colour options from the comfort of your home. You can view detailed product information, compare features, and even request a quote tailored to your specific requirements.
Our expert team is always on hand to guide you through the process, from selecting the perfect fit for your property to answering the most common questions about installation, maintenance, and aftercare. We pride ourselves on offering comprehensive customer support, ensuring you feel confident at every stage—from your initial enquiry to the final installation of your new windows and doors.
All our products come with industry-leading guarantees, and our customer service doesn’t end once your windows are installed. Whether you need advice on cleaning, maintenance, or future upgrades, we’re here to help. With our commitment to quality and customer satisfaction, you can trust us to deliver the right windows for your home, backed by reliable support and aftercare.
Casement Window Gallery
Matching Patio Doors
All of our window ranges have matching doors. If you are replacing your windows, you may also be considering replacing patio doors or even opening up the garden for the first time with patio doors. All of our casement windows have a range of patio doors and back doors that match the windows. You are not under any pressure to replace everything at once. You may wish to spread the budget by replacing the windows now and the doors later. Some of our customers split the budget by replacing front windows followed by back windows later. It’s all up to you.
We are here to help you achieve your dreams in the way that is best for you.

























