Our latest Extreme UPVC Windows are among the most energy efficient and environmentally friendly products in our range, so much so that they are in fact better than standard A-rated windows, which are commonly perceived to be the best available. Thanks to continual product development and design improvements, our Extreme UPVC windows will insulate your home better than ever before – stopping internal warmth from escaping and limiting the number of times that you feel the need to turn the heating on.

Explore our Extreme UPVC Windows
Being an expert in window design and installation, our Extreme window range has been created to pass every window standard out there. Every UPVC window has an A+ energy rating, making it one of the most secure window ranges in the UK market. Competing windows are unable to compete with our Extreme windows, especially for energy efficiency, style, or security reasons.
UPVC Casement Windows
With it hinged on one side, our Extreme casement windows can be designed for single or multiple outward openings. Its robust frame minimises maintenance requirements, while the inclusion of thermally efficient glass enables it to achieve an industry-leading A+ energy rating.
For security, these windows feature vault bolts, a multi-cam locking system, interlocking hinge bolts, and key-locking handles, ensuring maximum protection for your home.

UPVC Flush Windows
If you currently own timber windows, you may have noticed wear and tear over the years. Thankfully, this won’t be an issue with our Envisage flush windows as UPVC is much more durable and weather resistant.
We’ve also got the look of traditional flush windows just right. Resembling traditional flush windows in appearance, Envisage surpasses wooden flush windows in every aspect of performance, especially security and insulation. Envisage is not only authentically designed but also meets the demands of modern-day functionality.

UPVC Tilt & Turn Windows
If practicality is a key window feature, you may want to explore our UPVC tilt & turn windows. Their clever design means with a single turn of the handle, the window tilts inwards at the top, allowing gentle ventilation while keeping safety a priority—ideal for homes with toddlers and young children.
A full turn of the handle from a closed position opens the window fully inwards, making it convenient and safe for cleaning.

UPVC Bay & Bow Windows
Bay & Bow windows stand out from the selection of windows in our showroom due to their three or more outward-projecting sides. This unique structure allows them to capture natural light far more effectively than a standard flat window.
Offered in rectangular, triangular, or polygonal designs, bay & bow windows are often called lounge windows, as they’re a common feature in living rooms. When installed in your lounge, they provide a stunning panoramic view.

UPVC French Windows
You’ve likely encountered French doors before, but you may not be as familiar with French windows. Operating in much the same way, they feature two parallel-opening vents that create a wide and airy opening.
When fully opened, French windows offer that sought-after indoor-outdoor connection, seamlessly blending your interior and exterior spaces. They’re often used as a pass-through in kitchen areas, ideal for social gatherings and adding both functionality and charm.

UPVC Cottage Windows
Cottage windows hail from a simpler time when skilled craftspeople devoted countless hours to handcrafting each window—a tradition our expert team continues today. Meticulously designed, these windows preserve the charm of traditional cottage styles while being updated to meet the thermal efficiency and security demands of modern homes.
To ensure our cottage windows are regarded as true contemporaries of their classic counterparts, we made it essential for them to surpass the originals in performance.

UPVC Shaped Windows
A traditional window shape may not always be the best fit for your home. Understanding this, we offer arched and shaped windows that enhance both external views and light intake.
Favoured by North Lancashire and Cumbrian homeowners, our Extreme UPVC arched and gable windows exude timeless elegance while meeting top security standards. With minimal maintenance required, they maintain their appearance and deliver outstanding energy ratings.

UPVC Fixed Windows
For breathtaking external views and an abundance of natural light, look no further than our Extreme non-opening fixed windows.
Fixed windows may not open but they perfectly frame outdoor scenery, bringing it to the forefront like never before. Affordable and versatile, they can be tailored to various sizes and require minimal maintenance.

UPVC Sash Windows
A modern take on the classic sliding sash window is here – meet the Extreme sliding sash window. Highly efficient at reducing draughts, it requires minimal upkeep to keep its frame shining in the sun. Once installed, you’ll notice a warmer home interior, with the outdoor chill firmly kept at bay.
The operation of the sliding sash window is effortlessly smooth, thanks to tilt restrictors that let you adjust it to multiple angles. Ergonomic handles further enhance ease of use.

UPVC Reversible Windows
Easy to clean and simple to operate, Planet’s Extreme fully reversible window is a practical and stylish option for your home.
The pivot mechanism enables your window to rotate your window a full 180 degrees, allowing you to clean your windows from the inside. It also incorporates an advanced locking mechanism and automatic safety catches as standard.

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Why choose our double glazed Extreme UPVC windows?
Look no further for UPVC windows, as we firmly believe Extreme UPVC windows stand head and shoulders above the competition. Discover the benefits and see what else you get for your investment.
20 year guarantee on window collections
Our most energy efficient window collections
Showroom in Kendal, Cumbria
Manufactured in Britain
Premium locks & hardware
Broad range of colours
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Extreme UPVC windows from Planet set new standards...
When comparing Extreme UPVC windows with standard UPVC windows on the market, the difference in quality becomes immediately clear. The Extreme range stands out with its superior build, extensive security features, and industry-leading 20 year guarantee, offering unmatched peace of mind.
Unlike typical UPVC windows, Extreme UPVC windows come equipped with advanced security components and A+ energy-rated glass, ensuring that your home remains safe, warm, and energy-efficient. Not only will you enjoy enhanced comfort, but you’ll also see the benefit of lower energy bills.

Extreme UPVC windows security
Our safety-first approach compels us to create high-security casement windows, as we want them to make you feel safe in your space. Learn about the many security features of the windows.

Cranked Window Handles
You’ll soon find it effortless to open and close the windows, thanks to the ergonomically designed handles that make the task easy.

Window Hinge Bolts
For a UPVC window to be exceptionally sturdy, it requires strong hinge bolts. The bolts we use secure the hinge side of the sash, preventing break-ins.

Herculean Window Hinges
Trying to force open an Extreme UPVC window with a crowbar would be a futile effort, as the robust Herculean hinges provide strong protection against it.

Multi Locking Mechanisms
Once engaged, a multi-point lock secures the window in place, creating a barrier that any potential intruder would struggle to bypass.
Premium window accessories bespoke to you
In addition to our impressive selection of window styles, Planet offers a stunning array of colours, accessories, and finishing touches. Personalise our designs to perfectly reflect your style and enhance your North Lancashire or Cumbria home’s character.
A range of deep, captivating colours...
White continues to be the most popular choice for UPVC windows, but it’s facing tough competition from shades like Anthracite Grey, Olive Grey, Irish Oak, and Cream. Want to make a statement? Dark Red is sure to turn heads in your neighbourhood. If you’re unsure about your colour choice, consult one of Planet’s expert advisors for guidance.
Premium handles...
Window handles are essential for both smooth operation and adding that finishing touch to your windows. If you’re unsure which handle suite works best for you, our friendly team is happy to lend a hand.
Handles also play a key role in security, providing that extra peace of mind to keep your Extreme windows secure and protected.
Engaging colours that underline the windows’ presence...
You’ll likely spend a similar amount of time selecting a colour for the window handles as you did choosing the handles themselves because there are so many options. Whether you opt to match the handles to the window frames or go for a different, contrasting finish, we offer a wide range of appealing colours.
Let us help you find the perfect shade to complement your home.
Premium glazing for your UPVC windows...
Extreme windows deliver their exceptional performance thanks to the intelligent glazing within their UPVC frames. Not only does the glass enhance the look of your home, but it also helps to retain warmth and flood your space with natural light. Additionally, it can significantly reduce external noise for a more peaceful interior.
This advanced glazing isn’t commonly found in standard UPVC windows, but with Extreme, it’s part of the package! If privacy is a priority in certain rooms, ask us about privacy glazing options for your window replacements.
Astragal, Georgian or leaded bars...
For those who appreciate traditional design, incorporating leaded, astragal, or Georgian bars into Extreme UPVC windows is an excellent choice. These timeless features will enhance the charm and character of your windows.
Classic window styles often include bar detailing, so why not embrace tradition and add this elegant touch to your home?

Did you know our windows & doors come with a 20 year guarantee?
That’s double what most other double glazing companies offer for their windows & doors – giving you total peace of mind.
Have you explored our front & back doors to complement your new UPVC windows?
New UPVC windows deserve doors that live up to the same standard. Our stylish front and back doors are designed to complement your new UPVC windows perfectly – offering a seamless look, improved energy efficiency, and enhanced security across your entire home.
Planet customer reviews
Don’t just take our word for it, read a selection of reviews from our customers and their experiences with Planet.
Request your free quote today
Simply fill in your details for your free, no obligation quotation, and click “Get Quote”
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