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Just like the interior of your property, the exterior should reflect your individual style, character, and personality and that starts with your windows!

At Zenith, we offer a collection of colours, styles, glazing options and accessories for you to choose from, which means you can create the windows you want without compromising on performance, safety or security.

Of course, it is not all about looks and all our windows are 'A' rated PVCu Double Glazed and come complete with a 10 year warranty as standard.

Whether you're looking for casement, tilt and turn, sash or bay windows, we have a whole range of options available, all of which can be completely customised and upgraded to meet your specific needs and complement your home.

Your new windows await. To receive a completely FREE, no obligation quotation, simply complete our online quote form and we'll take care of everything!

All the answers in one place

Find all the information you need to know about our high performance 'A' rated PVCu double glazed windows here:
Do you recycle the old windows you replace?

Yes we recycle as much as we possibly can. Materials are separated into glass, plastic, timber and general waste.

Is there a difference between uPVC and PVCu?

No, they are the same thing.

What does 'A' rated mean?

It is an indicator of how energy-efficient your products are. The rating system is based on a scale of A-G, with 'A' rated being the most energy efficient.

Do you offer a warranty with your products?

Zenith offers a 10 year inclusive warranty with all windows abnd products.

What are the benefits of PVCu double glazed windows?

Improved home security - Thanks to multi point locking, lower heating costs 'A' rated double glazing keeps the heat in and they're all virtually maintenance free and Weather proofed PVCu frames just wipe clean.

Technical information

Learn more about our PVCu windows.


The combination of multi-chambered PVCu frames, weather seals and double-glazing units help to improve noise and thermal insulation.


All our windows feature the most advanced technology when it comes to safety and security for your home. Our windows include multi-locking systems, double locking door handles and more to keep your home secure.


Our PVCu windows stay looking as good as the day you bought them with minimal maintenance effort; that’s one of the great things about PVCu. They’re stronger than timber and the finish will never discolour, crack or flake meaning you can save on maintenance costs and effort as there won’t be any need for re-painting.

Reduce Heat Loss by 70%

Upgrading your windows from single glazed units to modern ‘A’ rated PVCu units will help to reduce the loss of heat through your windows by a staggering 70% compared to a single glazed unit, or by 50% compared to inefficient early double glazing.

What is PVCu?

PVCu = polyvinyl chloride unplasticised. Bringing together chlorine and ethylene, liquid vinyl chloride (VC) is produced which is immediately changed in the process by polymerisation into polyvinyl chloride. Vinyl chloride is toxic and therefore a closed production process is used producing PVC as a white power that is chemically stable.

What is ‘A’ rated and when did it start?

Our window is part of the BSI Window Energy Rating(WER) Scheme which is based on the approved document L1B of the Building Regulations. WER’s came into force in 1st October 2010. Zenith Window is ‘A’ rated with a U Value of 1.4 W/m2K. Our BSi Kitemark number is KM 568391.

Step by step guide

At Zenith we want you to be happy from start to finish. From the moment you first contact us to your installation and aftercare service – we want to supply you with the very best in customer service.

We give you and your home the upmost respect; arriving promptly, working as quickly as possible and all with minimum disruption. When finished we clear up and leave your home just as we found it – only with brand new Zenith products installed for you to enjoy.


Choose your own style from our extensive range of Casement, Bay, Bow, Tilt and Turn and Sash Windows. You can choose your own colour, glass, accessories and finishing touches - all designed bespoke to your requirements and to suit your budget.


Simply call us free on 0800 114 3043 or complete the online form and we’ll arrange a suitable time for one of our consultants to visit you. They’ll offer you expert advice on all our windows, with no commitment and no pressure.


Get the best value quote from us with a clear, written cost on any windows from our range and the special offers available to you. Don’t forget to ask your consultant about the different payment options available through our Zenith Lifestyle Account.

4. Survey

Prior to the manufacturing of your made to measure windows, we’ll come round to carry out a full technical survey on your property.

5. installation

Let our Master Installers transform your home. Installation is stress free as we take care to minimise dust and disruption before leaving your home as good as new. Our team remove your old windows before installing and sealing your new windows into place.

6. aftercare

Satisfaction is guaranteed with a *10-year warranty on all of our windows and other home improvement products. Unlike some warranties, ours is fully transferable if you decide to move house.