“What our clients say”

“We were going to replace the polycarbonate on our conservatory roof but we were advised by Sharon that short term it would be much better to put the doors and window back in between the kitchen and the conservatory. Great advice and worked out cheaper than our original plan. Would definitely use them again!”
Customer in London
“I’ve just had a front door replaced, patio doors repaired and several windows renewed from a previous less than satisfactory company. Sharon kept me fully updated with pricing, ordering, delivery and fitting. Customer satisfaction is obviously important to this company unlike the previous company I’d employed.”
Customer in London
“I have had a significant number of windows and front door replaced including the encapsulation of the original 1930’s leaded lights by Knowles Stained Glassworks and I could not be happier. Would highly recommend. They are now working on the windows for my planned extension.”
Customer in London

UPVC Windows

'A' Rated UPVC Windows from Knowles Stained Glassworks

At Knowles Stained Glassworks we understand the importance of having the correct type of windows as they are essential to each home. They further the style and the look that you want to achieve, and also play a key role in the energy efficiency of your property. It is vital that the windows you purchase today will still be performing in years to come.

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We install UPVC Windows which are Energy 'A' Rated. Each window system is manufactured from materials that are extremely high quality and obey with the British Standards Institute.

UPVC Windows from Knowles Stained Glassworks

Knowles Stained Glassworks make it their priority to help both domestic and commercial customers in feeling safe and secure within their property. We seek to find a UPVC Windows unit that complements the scenery of your home and offers durability and security with high standard security locks and hinges. Over many years, our knowledge and experience within the glass industry has helped Knowles Stained Glassworks deliver excellent UPVC Windows.

It is important to us that every installation that is carried out is attended to with care and expertise. We are Certass approved so you can be assured that your installation complies with all Government regulations and you will also receive an insurance guarantee from CPA (Customer Protection Association).

UPVC Windows Built to last

As our UPVC Windows are built to last year after year you can forget about warping, discolouration, leaks and draughts as our expert team of installers guarantee that each unit installed presents long term performance, so you can be confident that you made the right choice.

Knowles Stained Glassworks offer UPVC Windows with style & security

Our UPVC Windows are available in a host of different styles and designs and are complete value for money as they are aesthetically pleasing, offer long term durability and are energy efficient. Each window is custom made for our client’s property and are fitted with hinge claws and multi point locking. We have installed many of these window systems in homes around London, Surrey and Sussex.

In the last 45 years, Knowles Stained Glassworks have built an excellent reputation in providing the highest levels of customer service. If you have an enquiry and are based in Horley, Crawley, Surrey, London, Sussex or The Home Counties, we can help you repair or design new UPVC Windows today. For more information, please get in contact with us on 01293 278326 or alternatively, send us an email or message via the website.

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Company Accreditations & Memberships

  • Knowles Stained Glassworks
  • Knowles Stained Glassworks
  • Knowles Stained Glassworks
  • Knowles Stained Glassworks
  • Knowles Stained Glassworks
  • Knowles Stained Glassworks

UPVC Windows – Image Gallery

Why Choose Us

Suited For All Budgets

We can help you find the right Windows, Doors and Conservatories as we have an extensive range of products available, no matter how big or small the budget.

Fantastic Guarantees

Our high quality goods and guarantees last up to 10-20 years, offering customers peace of mind and allowing them to enjoy their purchase for many years.

Energy Efficiency

We install A & A+ rated windows that can help you save hundreds of pounds a year on your energy bills. See how much you can save via our free quotation.

Customer Satisfaction

This plays an important role within our business and we always want to make sure that our customers are happy with the service we provide.

What Our Customers Say

“We were going to replace the polycarbonate on our conservatory roof but we were advised by Michael that short term it would be much better to put the doors and window back in between the kitchen and the conservatory. Great advice and worked out cheaper than our original plan. Would definitely use them again!”

- Customer in Horley

“I’ve just had a front door replaced, patio doors repaired and several windows renewed from a previous less than satisfactory company. Sharon kept me fully updated with pricing, ordering, delivery and fitting. Customer satisfaction is obviously important to this company unlike the previous company I’d employed.”

- Customer in Merstrum, Surrey

“I have had a significant number of windows and front door replaced including the encapsulation of the original 1930’s leaded lights by Knowles Stained Glassworks and I could not be happier. Would highly recommend. They are now working on the windows for my planned extension.”

- Customer in Bedfordshire

Download a Brochure

We have a large range of product brochures available to download. For more information on our Windows, Doors, Conservatories etc, please call us on 01293 278326.

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Kieran Boyle
Kieran Boyle
09:24 07 Jun 21
Our original stained glass panels were beautifully encapsulated and incorporated in our choice of aluminium frames.... Polite and trustworthy workers.read more
Max mmc
Max mmc
17:20 12 Mar 21
What a great experience... Knowles Stained Glassworks were helpful prompt & polite. They had everything I needed so I... will definitely return as the customer service was 1st classread more
Reviewer
Reviewer
14:07 14 Nov 20
Excellent customer service, quick turn around for our building project and a lovely finish. I wanted a pretty window... for a family bathroom (instead of just frosted glass). I had a few ideas and the team delivered a double glazed stain glass unit that exceeded expectations. I love it. Thanks for all of the hard work. Images below are before the build finished (and so sorry for the mess). But hope you agree how pretty the window is!read more
Alan Barclay
Alan Barclay
10:00 03 Nov 20
We are so pleased with the quality of the encapsulated leaded glass window. Sharon spent a lot of time with us in her... workshop to get the glass colours and design tweaked. The final product was superb and brightens our landing/hall up. The removal of the old window and fitting the new one was very quick by Michael and Tony. We would definitely use Knowles Stained Glassworks again.read more
Ian Kenyon
Ian Kenyon
09:44 14 Sep 20
Sharon was very helpful, responded quickly and gave advice. We had some old stained glass panels which we needed to be... removed from old timber, renovated and then encapsulated in double glazed units. Unfortunately the old glass was not cleaned up very well and therefore we now have to live with the dirty marks on the edges of the coloured glass which is rather disappointing given that this would have not take very long to do at the right timeread more
J B
J B
20:59 24 Sep 19
I’ve just had a front door replaced, patio doors repaired and several windows renewed from a previous less than... satisfactory company. Couldn’t be happier with the service from start to finish. Sharon kept me fully updated with pricing, ordering, delivery and fitting. Customer satisfaction is obviously important to this company unlike the previous company I’d employed.read more
Andrea Knowles-Jones
Andrea Knowles-Jones
18:07 24 Sep 19
I have had several windows on my property replaced at very reasonable prices but to a very high standard. Always... professional, friendly, punctual and no question was left unanswered. Can highly recommend this family run business to ensure you get the very best service expected of a long established business but with a L ocal, personal touch.read more
Google User
Google User
17:53 24 Sep 19
Would not hesitate to recommend Sharon and her team. Fantastic service from the start to the end and love the end... result. Thank you again for such an excellent serviceread more
Elaine Grobbelaar
Elaine Grobbelaar
17:06 24 Sep 19
We were going to replace the polycarbonate on our conservatory roof but we were advised by Sharon that short term it... would be much better to put the doors and window back in between the kitchen and the conservatory. The work was carried out and we couldn't be happier. The quality of the products supplied and the workmanship were faultless. Great advice and worked out cheaper than our original plan. Would definitely use them again!read more
Lucy Wood
Lucy Wood
16:59 24 Sep 19
Needed a window and back door replacing due to renovations on a house. Spoke with Sharon who sent one of her lovely... gentlemen round to measure up and then obtained a quote. We decided to have the backdoor changed to a barn door which looked amazing and fitted in lovely with our renovation project. Highly recommend Sharon and her lovely team all work was carried out to a very high standard and ensured the area was left clean and tidy after. Very happy customer.read more
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