Abacus Windows
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Welcome to Abacus Windows, Chelmsford Abacus Windows are your local, professional manufacturers and installers of top quality PVCu windows, doors and conservatories. As a family run business located in the heart of Chelmsford we have been manufacturing and installing windows since 1996 to local installers, general public and commercial contractors.

We offer a tailor made service that works closely with their customers. We are confident that we will guide you through your home improvement ideas converting them into a reality, our reputation relies on it. We openly invite you down to our manufacturing factory to see your windows as they are being made to give you full confidence in the work we do.

Aluminium Bi Fold Doors Superior, slimline, aluminium, bi folding doors made to measure and available in a wide range of powder coated finishes and free quotes available. Replacement Windows Whether you're a trade customer or a home-owners, we fabricate all our energy efficient windows onsite, on time and on budget.
Reviews (7)
Karen Chaney
Karen Chaney
Jun 24, 2021
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Today we had all of our windows replaced, by Abacus Windows Ltd. Acoustic glass and trickle vents. I cannot recommend them highly enough, from the first point of contact with Gareth, to the exceptional installation by David and James, their fitters. They are without doubt, the most thorough and efficient team. Thank you Abacus, for a great job, very well done, and at a great price too.
James Broughton
James Broughton
Sep 28, 2020
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Changed all the windows on a 3 bed house, front door and patio door plus building a bow bay window for the lounge. Dave the window fitter was great (even helped out by putting my fence back up during the storms!) and Gareth was great too, no hard sell, a relaxed process, price was very competitive and 6 months on we haven't had any issues.
Sue Burton
Sue Burton
Jul 26, 2020
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Great family run company. Felt very personal and wasn't pressured into purchasing
Adam Nyman
Adam Nyman
Nov 18, 2019
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Had 2 large windows and french doors fitted in 2015 by a company that has ceased trading now.
One of the window locking mechanisms stopped working correctly, and I noticed that on the edge of one of the windows was a label saying manufactured by Abacus Windows. Called them yesterday and was advised to pop down with the broken lock and they would see what they can find.
Saw Gareth this morning who supplied a new locking mechanism of exactly the same type and showed me how best to re-fit with the extension arms. Was cheaper than on the net and an excellent service. I now have a contact so if I
Thomas Smokes
Thomas Smokes
Sep 07, 2019
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Literally saved me thousands using this local company over Everest. The product is miles better when comparing the two. Service is second to none, clean, tidy, quick and a bit go banter! Thanks Gareth and team.
Elaine Jackson
Elaine Jackson
Aug 25, 2019
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Recently had my kitchen and internal decorating done, couldn't afford the bi-fold I wanted to complete the house off until I saw Gareth. He came over to replace my patio door and agreed the bi-fold would be better so he tried to make it affordable. He managed to keep it well within my budget, cheaper than anyone else I had and offered a more complete package than anyone else. So happy I stumbled across them. Highly recommended!
Mary Green
Mary Green
May 07, 2019
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Had to wait 6 weeks because they were so booked up but it was worth waiting for. Friendly and professional, very easy going, no 'traditional' sales techniques, I even went to see my windows being manufactured. Will be using again for my rear extension.