Established in 1997 and based in North Antrim, Complete Window Systems is a family run business supplying and installing high quality Energy rated uPVC windows and doors throughout most of Northern Ireland, (see our Area’s Covered page). We want your windows and doors to be as individual as you are and will choose windows and doors that suit your home, your style and your personality from our wide range of colours and designs.

We have worked hard to establish our excellent reputation in the industry and have our own teams of experienced fitters ensuring top quality workmanship at all times. If you are looking for Double or Triple glazing units for a new build home or Replacement Windows or Doors, Complete Window Systems provide the highest quality windows and doors together with the very best service from your initial enquiry right through to the finished installation.

All quotations are tailor made to ensuring you get the best design advice and value for money and have a Price Match guarantee where we will match or better any existing written quotation you may have received.

Windows | Composite Doors | Panel Doors


Good Morning Hilary, your guys have done a good job and I paid the balance when they finished. Regards Neill.
Neill Alcock, Grovemount Court L’Derry
CWS completed our home’s transformation from double glazing to triple glazed windows and doors and we are immensely pleased with the results. The fitters were perfectionists, tidy and well experienced tradesmen and we are delighted with our new install. Thank you Hilary and team.
David & Gwyneth McQuiston, Drumalief Rd Limavady
Hi Marian, absolutely chuffed too bits with our door, such a fantastic job from start to finish, this wee company makes the whole process so simple, great service , friendly professional fitter who is a real asset you’re your company. I am so pleased I went with Complete Windows and would recommend them to anyone . Many Thanks Sonya
Sonya Richie, Portrush
Please thank the two fitters for a job well done, in fact, Gary could not do enough and helped with putting curtains and blinds back up. I would definitely recommend your services. Thank you.
Barbra Abraham, Lever Park Portstewart
I would like to say a massive thank you to Complete Window Systems for the tremendous job they have done for us our brand new windows have given our home a complete facelift.

I’d like to thank the fitters for a truly professional job not only in there fitting but also for not leaving any mess it was an all round top job boys!

I’d also like to thank the management for the way they dealt with us with no fuss straight to the point of what we were looking for and I must say we got excellent value for money.

I would highly recommend these guys to anyone! Many thanks again.

Colin Quinn
We’ve had new Windows and doors fitted. The service has been perfect and the 2 fitters were amazing boys, very little mess or fuss. The end job is fantastic and we are so pleased with our new windows and doors. I would highly recommend to anyone. Thanks again!
Carrie Barkley-Smith
The guys were top class and finished to a quality beyond my expectations but to my delight. One example was that the second thing I was asked was “where is the vacuum” and that was well used. the guys were a pleasure to work along with, always busy busy, but always very friendly.

The choice of Windows and especially the front door have been very suitable and the house now has a smile in its face.

Very professional job. Fitters were great no mess whatsoever. Would highly recommend Complete Window Systems. Love my new front door.
Violet Gilmore