What is UPVC Windows


What is UPVC Windows, How are They Made and Benefits?

Paul Noad
Written by Paul Noad
Updated on 22nd April 2024
Posted on 12th March 2024

Are you considering upgrading your home’s windows?

Modern UPVC windows offer an exciting combination of durability, energy efficiency, and low maintenance, making them an attractive choice for homeowners looking to improve their living space.

Our UPVC window experts at Value Doors explore the world of UPVC windows, delving into the material, manufacturing process, and various styles available.

They also answer the age-old question, “What are UPVC windows?” and explain their role in reducing energy bills and enhancing home security.

By the end of this guide, you’ll have a clear understanding of the many benefits UPVC windows can provide, and you’ll be equipped with the knowledge to make an informed decision when choosing the perfect windows.

What are UPVC Windows Overview

  • UPVC windows provide a modern solution with durability, low maintenance requirements and energy efficiency.
  • UPVC features multiple layers of insulation for improved thermal performance and lower energy bills.
  • Enhanced security, customisation options and professional installation are essential for UPVC window frames.

Look no further than our range of UPVC windows online now for a wide range of styles and choices.

Delving into UPVC as a Window Solution

UPVC windows have become increasingly popular among homeowners, and for good reason.

These durable and energy-efficient modern UPVC windows offer a solution that stands out from traditional timber or aluminium windows.

Not only do they require very little maintenance, but they are also highly energy-efficient, which can translate into significant savings on energy bills.

Understanding UPVC and how these windows are made is essential to appreciate their advantages.

So, let’s begin by familiarising ourselves with the material and the process involved in crafting these high-performance window frames.

See our range of UPVC doors.

What does uPVC stand for?

UPVC stands for unplasticised polyvinyl chloride. It is a type of hard plastic which is extensively used in the manufacturing of windows and doors.

UPVC is rigid and has very low thermal conductivity, unlike traditional PVC, making it an excellent insulator.

In fact, UPVC windows are highly energy-efficient due to their multiple chambers of air within the frame, which effectively trap more heat than other materials like wood or aluminium.

This unique characteristic of UPVC allows it to reflect heat back into your home, reducing the need for additional heating and ultimately saving you money on energy bills.

Furthermore, its resistance to weathering and rot ensures that your windows remain pristine for years without constant upkeep.

How are UPVC Windows Made

The process of creating UPVC window frames includes the following steps:

  1. Heating the plastic material to a soft and malleable state.
  2. Pouring the heated material into a mould to achieve the desired shape.
  3. Using moulds of different shapes and sizes to generate specific profiles and dimensions for various window styles, such as casement, sliding, or tilt-and-turn windows.

Once the UPVC material has been shaped in the mould, it is quickly cooled to retain its form.

This cooling process is accomplished by immersing the profiles in a water solution, allowing them to solidify and maintain their robust shape.

The result is a durable, versatile window frame with excellent insulation and energy efficiency.

The Anatomy of UPVC Window Frames

The design of UPVC window frames plays a crucial role in their unparalleled performance-to-value ratio. These frames typically consist of a head at the top, jambs down the sides, and a sill or cill at the bottom.

Additionally, they may include window hardware parts such as handles, hinges, and locking mechanisms. But what makes UPVC window frames stand out is their unique multi-chamber design.

It’s time to delve deeper into the anatomy of UPVC window frames and explore how their various components contribute to insulation, weather resistance, and overall performance.

Layers of Insulation

UPVC windows feature multiple layers of insulation that work together to provide better thermal efficiency and reduce energy bills.

The main insulation layer is the insulated glass unit (IGU), which consists of two or more glass window panes separated by a space filled with air or a gas, such as argon.

This space serves as insulation, preventing heat from escaping to the exterior and maintaining more warmth inside the property during the winter months.

In addition to the IGU, UPVC windows may also have weather-sealing strips and caulk to enhance insulation.

These various insulation layers work together to create a thermally efficient window that can help you save money on your energy bills.

Seal the Deal: Gaskets and Weather Seals

Another important aspect of UPVC window frames is the presence of gaskets and weather seals.

These components are designed to create a secure seal along the edges of the windows and doors, ensuring they are weatherproof and energy-efficient.

Gaskets and weather seals help maintain a comfortable interior environment by preventing drafts and reducing sound infiltration.

Gaskets are tightly fitted between the glass panels and the UPVC window frame, providing an effective barrier against drafts, leaking windows, and the infiltration of harsh elements.

High-quality gaskets and seals not only guarantee a tight and secure fit but also contribute to the energy efficiency of the windows through effective insulation.

In contrast, poor-quality gaskets and seals can reduce energy efficiency, increase energy bills, and compromise comfort.

Why is UPVC The Best Choice For Windows?

One of the most appealing aspects of UPVC windows is the wide range of styles available. A UPVC window suits every homeowner’s taste and aesthetic preferences, from traditional to modern designs.

Whether you’re looking for:

  • the classic charm of sliding sash windows
  • the practicality of tilt and turn windows
  • the versatility of casement windows
  • the elegance of French windows
  • the contemporary look of bay windows

UPVC offers a variety of options to suit your needs, including UPVC frames. Not only that, these new windows cost a lot less than other materials like aluminium and timber.

We’ll now examine some of the most popular window styles, highlighting their unique features and benefits compared to UPVC.

Versatile Casement Windows

Casement windows are a popular UPVC option due to their adaptability, energy efficiency, and various configurations.

These windows are hinged on one side and swing outwards, providing excellent ventilation opportunities.

Casement windows are available with single, double, or triple glazing, depending on the size of the frame and your insulation requirements.

In addition to their flexibility, casement windows offer excellent energy efficiency thanks to their tight seal when closed.

This seal helps to minimise drafts and heat loss, further contributing to your home's overall energy efficiency.

Sliding Sash Charms

UPVC sliding sash windows combine the timeless elegance of traditional sash windows with the modern functionality and durability of UPVC. These windows feature:

  • Two sashes that slide vertically over each other
  • Classic and sophisticated look
  • Improved security and thermal efficiency compared to wooden counterparts

By opting for UPVC sliding sash windows, you can enjoy the charm of a classic design without sacrificing the benefits of modern materials and technology.

Tilt and Turn for Functionality

Tilt-and-turn windows are practical for homeowners seeking versatile ventilation options and enhanced security.

These UPVC windows can be tilted open inwards from a hinge at the bottom for draft-free ventilation or fully opened from a side-mounted hinge for maximum airflow.

This dual functionality makes tilt-and-turn windows an ideal choice for modern homes.

In addition to their practicality, tilt-and-turn windows offer a sleek and contemporary appearance, making them a popular choice among homeowners looking for a balance between style and functionality.

Colour Choices and Customising Your UPVC Windows

One of the advantages of UPVC windows is the ability to customise them to match your home’s style and decor.

UPVC windows are available in various colours and finishes, allowing you to create a unique look that complements your property.

Whether you prefer a classic white frame or a more striking colour, the options are virtually limitless.

By choosing UPVC windows in a color and finish that suits your style, you can enhance your home’s curb appeal and create a cohesive aesthetic throughout your property.

Is UPVC Energy Efficient For Windows?

One key benefit of UPVC windows is their role in improving energy efficiency and potentially reducing energy bills.

Thanks to their excellent insulation properties and thermal performance, UPVC windows can help maintain a comfortable temperature inside your home, reducing the need for additional heating or cooling.

We’ll now examine the energy efficiency advantages of UPVC windows further, studying the impact of double or triple glazing on thermal comfort and energy savings.

The Impact of Double or Triple Glazing

Double or triple-glazed UPVC windows can significantly enhance the thermal comfort of your home and contribute to energy efficiency. These windows feature:

  • Two or three panes of glass separated by sealed layers of insulating gas
  • Reduced heat transfer and minimised heat loss
  • Superior insulation compared to single-pane windows
  • Maintenance of a consistent temperature inside your home
  • Potential savings on your energy bills

Opting for double-glazing, such as double-glazed or triple-glazed UPVC windows, provides a more comfortable living environment and reduces energy consumption, positively impacting the environment.

Read more about the cost of double-glazing here

Low Maintenance Living: Keeping UPVC Windows In Good Condition

One of the most attractive features of UPVC windows is their low maintenance requirements. These windows are resistant to:

  • dust
  • rust
  • corrosion
  • rot

This makes them an easy-to-care-for option for busy homeowners. Unlike wooden windows, which may require regular painting or sealing, UPVC windows can be kept pristine with minimal effort.

To keep your UPVC windows looking their best, periodically wipe them down with a damp cloth to remove any accumulated dirt.

Your UPVC windows will maintain their appearance and functionality with proper care for years.

Did you know you can paint UPVC windows? Read our quick guide if you want to change the colour of your old windows!

How Secure Is UPVC for Windows?

In addition to their many practical benefits, UPVC windows offer enhanced security features that help keep your home safe from intruders and harsh weather conditions.

These windows are made with reinforced galvanized steel, increasing strength and durability.

Furthermore, many UPVC windows have multi-point locking systems that securely fasten the window into the frame at multiple points, ensuring a more secure closure and added protection against break-ins.

By choosing UPVC windows for your home, you can enjoy peace of mind knowing that high-quality materials and advanced security features protect your property.

Choosing and Fitting UPVC Windows

Selecting and installing UPVC windows may seem daunting, but with accurate measurements, professional installation, and a reputable window supplier, the process can be smooth and stress-free.

Avoiding costly mistakes or delays requires accurate window measurements; hence, it is important to invest time in gathering precise measurements.

When it comes to installation, hiring a professional team is highly recommended to ensure that your UPVC windows are fitted correctly and securely.

By choosing a reputable window supplier and investing in high-quality materials, you can enjoy the many benefits of UPVC windows for years.


In summary, UPVC windows offer many advantages for homeowners seeking a modern, energy-efficient, low-maintenance window solution.

From their durable construction and excellent insulation properties to their variety of styles and customisable options, UPVC windows can enhance any home's beauty, comfort, and security.

If you’re considering upgrading your windows, explore the world of UPVC and discover how this versatile material can transform your living space while contributing to a more sustainable and energy-efficient future.

Frequently Asked Questions

What is meant by uPVC windows?

uPVC stands for Unplasticised Polyvinyl Chloride and is a form of plastic used to make window frames and sills when installing double glazing.

It's strong, durable, and resistant to corrosion, moisture, and heat, making it ideal for window construction.

What is the difference between uPVC and PVC windows?

uPVC and PVC are both useful materials, but the main distinction between them lies in their plasticisers: PVC is coated in plasticisers, making it softer and more flexible while uPVC is uncoated and thus harder and more rigid.

This means uPVC is preferred for window frames, while PVC is better suited to products like wires, shower curtains and clothing.

What is the disadvantage of uPVC windows?

uPVC windows and doors are more prone to cracking or breaking due to their lower strength than wood or metal, meaning repairs may be necessary more often.

Which window is better, aluminium or uPVC?

Ultimately, aluminium windows offer greater durability and longevity than uPVC windows, making them a more cost-effective solution in the long run.

However, the cost difference between aluminium and uPVC will depend on individual preferences and circumstances.

What styles of UPVC windows are available?

UPVC window styles include casement, sliding sash, and tilt and turn options, offering a range of features and looks.

Written by
Paul Noad
Paul Noad Sales Advisor
Posted on: 12th March 2024
Topic: Advice

Paul Noad is a seasoned Sales Advisor passionate about delivering exceptional customer service and driving sales success. With a background in sales and a commitment to exceeding client expectations, Paul brings a wealth of expertise to his role.

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