An Extreme UPVC window is a cut above your normal UPVC designs and is covered by our reliable 10-year guarantee…

From a style and performance perspective, the Extreme window range at Premier Windows is by far the leading UPVC window collection around. With its advanced UPVC profile and performance glazing, it sets a new standard in security, thermal efficiency, and resilience. Tested to the Extreme, it’s incomparable to any other UPVC window system and we’re extremely proud to be the exclusive home of this principal window solution.

Extreme UPVC Windows

The perfect pairing of high-performance glass and a thermally insulating UPVC frame will potentially knock lots of money off your energy bills without you feeling any negative difference in the internal temperature.

Especially for the Extreme range, Premier Windows has developed an eclectic mix of styles and colours – create a design that brings the best out of your home.

Grey Extreme UPVC Windows
Extreme UPVC Windows


All the window styles that you’re most familiar with are included in our UPVC window range, including tilt & turn windows, bay & bow windows, casement windows and sliding sash windows.

Cream UPVC Cottage Windows


The practicality, simpleness and stylishness of a casement window is what makes it such a dependable and popular design for most house types.

UPVC Tilt & Turn Windows


Gain a wider window opening with an Extreme tilt & turn window and use it to keep your home well-ventilated in the summer months.

UPVC Sash Windows


A perfect blend of strength and practicality is how best to summarise the sliding sash window, and it has an invaluable vertical opening.

Do your windows have EXTREME protection?

You rely on your windows to keep you safe at home. Do you have full confidence in the ability of your existing windows to do that? If not, you should upgrade your windows and have our EXTREME windows installed by Premier. 

  • EXTREME enhanced security with centre VAULTBOLT and multi cam locking technology.
  • EXTREME enhanced durability with UNIQUE superglide gearbox ensures smooth operation.
  • EXTREME enhanced COMPRESSION and acoustics with interlocking hinge bolts and optimum weatherseals.

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.
A+ energy rated windows come as standard...

Did you know that your old windows could be responsible for around 25% of the heat lost from your property? Any EXTREME windows bought from Premier Window carry an A+ energy rated as standard. This exceeds the thermal qualities of most replacement windows in the region. Our A+ energy rated windows are also great for solar control and will keep the internal temperature just right.

White UPVC Windows
Oak Envisage Flush Windows
White UPVC Windows


Once you have chosen what style of replacement windows you would like, you can then customise the design by choosing a colour finish, the glazing and hardware.

We will spoil you for glazing options, even offering privacy glazing...

Your new replacement windows need to be appropriately glazed and Premier Windows can supply you with several glazing options, including privacy glass and energy rated glass. No prizes for guessing that our energy rated glass provides a very high standard of thermal efficiency and will save you a fortune on your future energy costs. It can accommodate leaded glass and astragal bars, when requested.

Secure handles crafted with care…

The hardware on our replacement windows always attracts attention. You can see and feel just how much detail has gone into each individual piece, and there are some very complex offerings within the suite.

Without these high-quality handles and hinges, our windows wouldn’t enjoy the popularity that they have amongst window buyers. The finishes applied to our hardware solutions are similarly impressive and won’t lose any of their appeal.


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It would be a delight to meet you in our Oswestry showroom, where we have a fantastic team of sales staff ready to assist you with your home improvement buying needs and take any questions.