Business Details
36 Years
experience
Trusted Window Door & Conservatory Installers
Established in 1990, Castle Windows has built a reputation as a leading provider of windows, doors, and home extensions across Berkshire and surrounding counties. With over three decades of experience, our team of skilled professionals delivers tailored solutions that enhance property aesthetics, security, and energy efficiency. We pride ourselves on using premium materials sourced from industry leaders, ensuring durability and performance. Certified by FENSA, the Federation of Master Builders, and Checkatrade, we combine technical expertise with exceptional customer service. Our 40-strong workforce, including installers and tradespeople, has completed over 40,000 installations, reflecting our commitment to quality craftsmanship.We offer comprehensive services including double-glazed windows, composite doors, conservatories, and roofline replacements, all supported by insurance-backed guarantees. Our local knowledge and focus on innovation ensure we meet evolving customer needs while maintaining competitive pricing. Customer testimonials highlight our professionalism, reliability, and the transformative impact of our installations. As a financially stable company with no history of receivership, we provide long-term assurance for all our projects.
Services
Double Glazed Windows
Composite Doors
Conservatories
Roofline Replacement
Window Repairs
Door Installations
Solid Conservatory Roofs
Patio Doors
Sash Windows
UPVC Fascias
Details
- Year established: 1990
Highlights and features
- We have over 30 years' experience serving Berkshire homeowners
- Our FENSA certification ensures industry-standard installations
- 40-strong team with installers since company inception
- Insurance-backed guarantees on all products and workmanship
- 40,000+ installations completed with 5-star customer ratings
Associations and certifications
- FENSA
- Federation of Master Builders
- Checkatrade
What people say
Impeccable service
Prompt and professional
Amazing job
Excellent value
Highly recommended
Services
Double Glazed Windows
Our A++ rated double-glazed windows combine advanced thermal efficiency with enhanced security features. Each installation includes argon gas filling, low-E glass, and multi-point locking systems. Customers benefit from reduced energy bills and improved noise insulation while maintaining property aesthetics.
Composite Doors
Manufactured to PAS 24 standards, our composite doors feature reinforced frames and multi-locking mechanisms. The durable GRP skin resists warping with a 10-year guarantee. Available in 12 styles with custom ironmongery options to complement property design.
Conservatory Extensions
Tailored conservatory solutions from traditional Victorian to modern orangery designs. Constructed with thermally efficient profiles and solar-controlled glass. Includes optional solid roof conversions for year-round usability with full building regulation compliance.
Roofline Replacement
Complete roofline upgrades using maintenance-free Eurocell uPVC components. Includes fascias, soffits, and guttering with guaranteed colourfastness. Enhances property protection against weather damage while improving kerb appeal through coordinated colour schemes.
Window Repairs
Specialist repair service for failed seals, damaged frames, and broken hinges. Utilises manufacturer-approved parts with matching finishes. Includes emergency boarding for security until permanent repair completion within 48 hours.
Questions
Do you offer guarantees on installations?
All products carry a minimum 10-year insurance-backed guarantee covering both materials and workmanship.
Can you match existing window styles?
Our surveyors use digital templating to ensure perfect replication of traditional and modern window designs.
Are your installers directly employed?
Yes, all our 40+ installers are full-time employees with annual CPD training in latest installation techniques.
Do you handle local authority permissions?
We manage all building regulation applications and FENSA certifications as part of our installation service.
Can I spread payments for large projects?
We offer interest-free credit options through Novuna Personal Finance for installations over £2,500.
How long do typical installations take?
Window replacements complete in one day, full door installations within 6-8 hours, conservatories require 3-5 days depending on size.
Reviews (6)
James Gilbert
Feb 11, 2022
Report
We had 13 windows replaced, 2 Composite doors, Patio door and an Orangery built and I can honestly say it has been the worst experience of my life from day one!. Were having to have the roof replaced due to leaks, the Lantern window replaced and up-stand rebuilt as its the incorrect size for the opening. The Bi fold door is being replaced due to poor quality/leaking and won't open and the patio door was fine until they replaced a scratched door now it blows a gale through it. They did try to rectify faults but simply do not have the skill level even to understand issues pointed out let alone rectify them.
John Braithwaite
Dec 19, 2021
Report
First set of windows and french doors ordered fitted September. French door handles floppier than a floppy thing, gaps where window frames seals had not been cut for a tight fit complained agreed would be sorted when the more expensive bi-folding doors and additional windows were to be fitted in November. November job done and after some head scratching window fitter takes some footage of floppy handles from September job for head office to review.
After 4 days being chased for payment of the November job, but no mention of rectifying the paid for September job. End of November after a prompt from me someone comes to look at the aged problems which by now the rubber seals are popping out for the 5000+ bifolding doors plus they are drafty. So yet again I'll be chasing them to sort these already paid for job. Don't do reviews however after 4 days you were chasing me for money however after 3 months I'm chasing you for faulty installation and lack of customer after sales service. Oh and when I called to get things resolved I was asked, "are they still under guarantee?" All just before Christmas.
After 4 days being chased for payment of the November job, but no mention of rectifying the paid for September job. End of November after a prompt from me someone comes to look at the aged problems which by now the rubber seals are popping out for the 5000+ bifolding doors plus they are drafty. So yet again I'll be chasing them to sort these already paid for job. Don't do reviews however after 4 days you were chasing me for money however after 3 months I'm chasing you for faulty installation and lack of customer after sales service. Oh and when I called to get things resolved I was asked, "are they still under guarantee?" All just before Christmas.
Rich Fielding
Dec 23, 2019
Report
I've been a customer of Castle Windows for around 20 years and have always had excellent service, I needed to claim on their warranty recently five years after the door was fitted and it was replaced quickly and efficiently with no quibbles at all.
IssuetheQuietus
Jun 07, 2018
Report
Nothing much to see here, as it's primarily just their depot, but they are looking to open a showroom, so this may well change.
St Eve Rowie
Mar 08, 2018
Report
1st install team damaged both doors, and broke a pane of glass, and just left them unable to be opened, 16 visits later by so called experts, they are now only just finally installed correctly, ( I hope) & the final team confirmed they had never been fitted properly, on any of the previous 15 calls. Screws missing, rubber seals damaged etc. waste of my time, Absolute joke. Avoid!
Umer Fraz
Nov 14, 2017
Report
Brilliant job. Quality of service as well as the products were good. It did take a bit longer than i expected, but the end result more than makes up for it.
