West Yorkshire Windows have been installing UPVC windows across Yorkshire since 1994. UPVC Extreme windows are a fantastic opportunity to keep your home as energy efficient as possible.

Our standard UPVC windows are impressive enough, but our UPVC EXTREME windows take things to a different level in terms of the security and energy efficiency they offer. A+ rated as standard for a comfortably regulated temperature, our clever glazing technology prevents internal heat from escaping, whilst harnessing just the right amount of heat from the sun.

Extreme UPVC Windows

Extreme windows will give your home a new and improved look, and its enhanced appearance will be evident for many years. Huge credit must go to those who have crafted the design as they’ve very obviously put in so much work.

The window has also been crafted in such a way that it is resistant to dirt, debris and damp, and will therefore not deteriorate. Its elasticated seals and compression technology also give the window structural integrity and ravishing good looks.

Grey Extreme UPVC Windows
Extreme UPVC Windows


West Yorkshire Windows has a diverse range of UPVC windows with many advantages. You won’t regret having UPVC windows installed in your home.

Cream UPVC Cottage Windows


Customers have identified that Casement windows offer it all – insulation, gorgeous aesthetics, extreme security etc. They will also suit most property styles found across West Yorkshire.

UPVC Tilt & Turn Windows


To build a tilt and turn window demands the use of multiple components – A+ rated glass, robust hinges and an 8-point locking mechanism. Collectively, they make a tilt and turn safe and secure.

UPVC Sash Windows


Our Sash windows fully integrate with our full range of replacement windows – so you can mix and match styles throughout your home.

Do your windows have EXTREME protection?

Don’t define our Cottage windows purely by their looks. They offer a series of other qualities:

  • EXTREME high security approved by the Police under the Secured by Design initiative, they also include up to nine-point locking systems.
  • EXTREME enhanced durability using components chosen for strength and reliability, designed to withstand factors that cause twisting or warping of inferior windows.
  • EXTREME enhanced compression and acoustics with interlocking hinge bolts and the finest weatherseals.
Casement Windows

Herculean Hinge

Heavy duty, highly engineered hinges that provide increased load bearing. With anti-crowbar technology and sustained use for a lifetime.

Extreme Locking

Up to 9-point locking system and two high compression hinge bolts to create 360-degree solidity. Also available with enhanced security option designed to meet the requirements of the police-recognised Secured by Design initiative.

Extreme Frame

Highly engineered frames, that encompass 14 chambers (combined sash and frame) to provide supreme thermal performance. Maximum protection against twist and ageing so your windows will look and operate like new for longer.

Extreme Weather Seal

Dual density and high elasticity for twice the standard coverage. Long lasting airtight protection from the elements and added noise reduction.

Ultimate Glass

High performance next generation glass for superb energy efficiency. Ultra-clear outer pane and a super soft coat inner pane. Improved clarity for the perfect view.

Extreme Handles

Our Extreme Handles come in a range of colours to suit your home. Built to last with robust materials and quality finishes.
West Yorkshire Windows offer maximum energy savings...

West Yorkshire Windows's replacement windows can ensure you notice a drop in your energy bills, saving you money every month. Fortunately, heat loss will become a thing of the past due to our modern, thermally reinforced window profiles.

The Energy Saving Trust has acknowledged our EXTREME windows for their thermal qualities and eco-friendly performance.

White UPVC Windows
Oak Envisage Flush Windows
White UPVC Windows


When you have settled on the right window style for your home, you will need to think about personalising the window to your taste. We offer a vast selection of coloured finishes, glazing choices and hardware to get just the right look.

Make the glass one of the main focal points…

We can’t just add bog-standard glass to an Extreme window. It needs the highest specification glazing and we have several forms of glass for you to choose from – fully transparent glazing is one option, as is privacy glazing. No-one will be left disappointed, either way. Privacy glass is most typically used for windows in bathrooms and bedrooms, where privacy is of paramount importance. You will still get plenty of light entering these spaces.

Beautifully constructed handles...

It’s the finer details that set our window range apart from the rest. We have a varied collection of handles in different styles to suit each and every window.

Our handles do not compromise on security either, as a secure locking system is built in.


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See how affordable your home improvement can be with our Finance Calculator.
  • BUY NOW PAY MONTHLY Spread the cost of your home improvements over 60, 120 or 154 months*
  • BUY NOW PAY LATER This option allows you a 12 month payment holiday from the date of completion.
Spread the cost over 60, 120 or 154 months...
60 monthly payments
Representative APR
120 monthly payments
Representative APR
154 monthly payments
Representative APR
This finance option allows you the convenience and flexibility of spreading the cost of your home improvements over 60, 120 or 154 months*. You must make the minimum repayment each month. However you can also make additional payments and therefore control the length of the loan and the amount of interest you would pay. No security is required on these loans. These calculators are for illustrative purposes only and do not constitute a credit quotation. *120 & 154 months finance only available for orders over £8,000.

Representative Example

Cash Price
Total Amount of Credit
Duration of Agreement
60 Months
Rate of Interest
12.4% p.a. fixed
Representative APR
12.4% APR
60 Monthly Payments
Total Amount Payable
Pay within 12 months + £29 exit fee
Want to pay in monthly installments after 12 months rather than one-off payment? Consider this option.
89 monthly payments
Representative APR over 7 years
This option allows you a 12 month payment holiday from the date of completion. Pay 10% deposit when you order, and as long as you pay the outstanding balance in full before 12 months has elapsed plus a £29 settlement fee, no interest will be charged. If, after 12 months, this is not convenient, you can pay in 80 monthly installments at 19.9% APR Representative. *Deferred for 12 months from the date of completion – £29 settlement fee applies if the loan is repaid in full during the deferral period and NO INTEREST will be paid. If the loan is not settled in full within the deferral period, then interest will have accrued from the start of the agreement on any amount still outstanding at the end of the deferral period. Interest will continue to be charged until the agreement is repaid in full. For legal reasons the Representative Example shows interest IF the outstanding balance is NOT paid before the 12 months has elapsed. No security is required on this loan. These calculators are for illustrative purposes only and do not constitute a credit quotation. These calculators are for illustrative purposes only and do not constitute a credit quotation.

Representative Example

Cash Price
Total Amount of Credit
Defer By
12 Months
Duration of Agreement
89 Months*
Rate of Interest
19.9% p.a. fixed
Representative APR
19.9% APR
80 Monthly Payments
Total Amount Payable
Settlement Fee


Unless you are an expert in all things UPVC, when you’re looking for replacement windows it’s natural to have questions. We’ve answered some of the most common questions we hear about UPVC windows below. If you have any other questions about our double glazing don’t hesitate to contact our window experts for advice.

What are Extreme UPVC windows?

Extreme windows are our UPVC window range, representing the very best of window technology and performance.

These windows are engineered to offer unparalleled style, security, energy efficiency, and durability, making them one of the most advanced window options available.

The Extreme Window collection excels in both style and performance. It combines innovative UPVC materials with advanced glazing and carefully selected hardware and accessories to ensure your windows are not only secure and energy-efficient but also stylish and built to last.

Engineered to be highly energy-efficient, their UPVC profile and superior glazing help maintain a comfortable and regulated temperature in your home, potentially saving you money on energy bills. Moreover, interlocking hinge bolts and optimum weather seals contribute to improved compression and acoustics, creating a comfortable and quiet living environment.

Our Extreme UPVC windows are designed for long-lasting durability, with a unique superglide gearbox that ensures smooth operation.

How secure are Extreme UPVC windows?

Our Extreme UPVC windows offer enhanced security to homeowners.

The Extreme collection places a strong emphasis on security, featuring 11 visible locking points on each window. This level of security provides three times the protection of a traditional window. Additional security features include a centre VAULTBOLT and multi-cam locking technology, ensuring your home remains safe and secure.

Security is paramount, and our Extreme UPVC windows are designed with enhanced security features to provide homeowners with peace of mind. These security features combined make Extreme UPVC windows a reliable choice for safeguarding your home and loved ones.

We understand that security is a top priority for homeowners, and we’ve gone to great lengths to ensure that our windows provide the highest level of protection possible. With Extreme UPVC windows, you can trust that your home is well-protected against potential threats, offering you the peace of mind you deserve.

Why should I add these windows to my home?

You certainly won’t regret getting our Extreme UPVC windows installed.

Adding Extreme UPVC windows to your home means investing in superior performance, durability, security, customisation options, energy efficiency, and refined aesthetics. These windows not only enhance the beauty of your home but also provide long-lasting value, comfort, and security for you and your family.

Extreme UPVC windows are engineered for top-tier performance. With advanced glazing, durable UPVC materials, and enhanced security features, they provide exceptional insulation, comfort, and protection. Backed by a substantial 20-year guarantee, these windows are built to last, ensuring long-term value and peace of mind.

Featuring 11 visible locking points, centre VAULTBOLT, and multi-cam locking technology, these windows offer three times the security of traditional windows, making your home a safer place. Extreme UPVC windows are also designed to be highly energy-efficient, helping you save on energy bills and maintain a comfortable indoor temperature.

The Extreme range offers a vast selection of colours and styles, allowing you to tailor the windows to your home’s architectural design and personal preferences. It also includes a variety of elegant window styles, from casement and sliding sash to tilt & turn windows, enabling you to find the perfect look.

Which windows styles can I have in the Extreme UPVC range?

Find the perfect style in our Extreme UPVC range.

West Yorkshire Windows offers a vast selection of sophisticated colours and styles, allowing you to choose the perfect look for your home. From casement windows to sliding sash windows, tilt & turn windows and more, there are options to suit various architectural designs.

These window styles in the Extreme UPVC range can be further customised with a wide selection of fashionable colours and finishes. Whether you’re looking for a traditional, modern, or custom look, you’ll find the perfect style and colour to elevate the look of your home.

You can explore our full collection throughout our website, in our brochure and in our Wakefield and Doncaster showrooms. Our experts are here to assist you in selecting the ideal window style and colour to enhance the beauty of your home.

Do you offer a guarantee on your replacement windows?

Our replacement windows come with a substantial 20-year guarantee, demonstrating their long-lasting quality and reliability.

Extreme UPVC windows from West Yorkshire Windows are the ultimate choice for homeowners seeking top-tier performance, style, and security for their homes. With a 20-year guarantee, these windows provide peace of mind and long-lasting value for your investment.

Our commitment to providing a 20-year guarantee underscores our dedication to delivering top-tier products that stand the test of time. We understand that your home is a significant investment, and we want to ensure that our replacement windows not only enhance its aesthetics but also contribute to its long-term value and comfort.

With our 20-year guarantee, you can trust that our windows are built to last and will continue to perform at their best, providing energy efficiency, security, and style for many years to come. We stand by the quality of our products and are here to support you throughout your window replacement journey, ensuring your satisfaction and peace of mind.

Want to speak with an Advisor? Give us a call on 01924 881920

Our friendly team will be pleased to help with any questions you may have.


Everyone is welcome to come in and browse around our Wakefield or Doncaster showrooms, where our friendly sales team will be pleased to help with any questions you may have.