Business Details
30 Years
experience
Expert PVCu Windows & Doors in Chelmsford
Established in 1996, Abacus Windows is a family-run business based in Chelmsford, specialising in the manufacture and installation of high-quality PVCu windows, doors, and conservatories. Our ISO 9001 accreditation underscores our commitment to rigorous quality control and innovation, ensuring all products meet the highest standards of energy efficiency and security. We offer tailored solutions for both trade customers and homeowners, with features such as PAS24-certified hardware, BBA-approved locking systems, and thermal performance guarantees. Our on-site fabrication process allows for precision and efficiency, while our 10-year performance guarantee on GRP doors reflects our confidence in product durability. We prioritise transparency, inviting clients to observe the manufacturing process for complete assurance.With a focus on customer collaboration, we handle projects from design to installation, including planning permissions and bespoke finishing touches. Our extensive range includes bi-fold doors, patio doors, and conservatories, all available in customisable designs and finishes. By combining advanced technology with traditional craftsmanship, we deliver solutions that enhance both the functionality and aesthetic appeal of residential and commercial properties. Our reputation is built on decades of reliable service, competitive trade discounts, and a dedication to transforming home improvement ideas into reality. As a trusted local provider, we remain committed to exceeding client expectations through personalised support and long-term value.
Services
PVCu Windows
Bi-Fold Doors
Conservatories
Composite Doors
Patio Doors
Aluminium Doors
Trade Frames
Double Glazing
Triple Glazing
Conservatory Installation
Details
- Year established: 1996
Highlights and features
- Family-run business with 28 years of local expertise since 1996
- ISO 9001 accredited manufacturing processes for quality assurance
- PAS24-certified hardware ensuring superior security standards
- 10-year performance guarantee on GRP composite doors
- Free, no-obligation quotations for all window and door projects
Associations and certifications
- ISO 9001
- PAS24
- BBA Approved
What people say
Top quality products
Excellent installation
10-year guarantee
Free quotations
Energy efficient designs
Services
PVCu Windows
Our PVCu windows feature sculptured or chamfered edges, available in multiple colours and foils. They offer exceptional acoustic performance and energy efficiency, reducing heating bills while maintaining security with BBA-approved locking systems. Tested to withstand 300kg force and 70mph winds, they outperform industry standards.
Bi-Fold Doors
Slimline aluminium bi-fold doors provide thermal insulation with U-values down to 1.4 and sightlines of 120mm for maximum natural light. They support door leaf weights up to 120kg and are PAS24-ready, ensuring durability and smooth operation for residential and commercial spaces.
Composite Doors
Ultra-energy-efficient composite doors combine security and style, with U-values as low as 0.89 and a 10-year performance guarantee. Available in diverse designs and colours, they exceed PAS24 security standards, featuring high-strength hardware for enhanced protection against forced entry.
Conservatories
Tailored PVCu conservatories create additional living space with double-glazed windows and energy-efficient designs. We manage projects from planning permission to installation, offering optional extras like underfloor heating and self-cleaning glass to enhance comfort and reduce maintenance.
Trade Frames
On-site fabrication of energy-efficient trade frames ensures precision and timely delivery. Available in double or triple glazing with units up to 40mm thick, these frames meet commercial requirements while maintaining thermal performance and acoustic insulation for both residential and contractor projects.
Questions
What types of windows do you offer?
We provide PVCu casement, tilt-and-turn, sash, and arched windows with energy-efficient U-values of 1.4 as standard, available in custom colours and finishes.
Are your doors secure?
All doors meet PAS24 and Secured by Design standards, featuring high-strength hardware and 10-year performance guarantees on GRP composite models.
Do you provide conservatory installations?
Yes, we design and install custom PVCu conservatories of any size, including planning assistance and optional extras like underfloor heating and glass lantern roofs.
Can I get a free quotation?
We offer free, no-obligation quotes for all window, door, and conservatory projects—simply contact our team with your requirements.
What accreditations do you hold?
We are ISO 9001 accredited, with PAS24-certified hardware and BBA-approved locking systems, ensuring compliance with rigorous quality and safety standards.
How long have you been in business?
Abacus Windows has been manufacturing and installing windows and doors in Chelmsford since 1996, serving homeowners and trade clients for over 28 years.
Reviews (6)
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
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.
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
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
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
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
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.
