Business Details
50+ Years
experience
Trusted Double Glazing Solutions in Epsom
Established in 1975, Marathon Windows has built a reputation as a trusted family-owned business specialising in high-quality uPVC windows, doors, and conservatories across Surrey, London, and the South East. Our expertise combines decades of experience with cutting-edge technology to deliver secure, energy-efficient solutions tailored to residential properties. Accredited by FENSA and Secured by Design, we prioritise customer satisfaction through no-pressure sales, in-house installation teams, and a 10-year guarantee on all products.Our commitment to sustainability is reflected in our use of fully recycled materials, while our BBA-certified products ensure compliance with the highest industry standards. With a focus on innovation and craftsmanship, we serve both new and returning customers, offering bespoke designs that enhance property value and comfort.
Services
uPVC Windows
Composite Doors
Bi-Fold Doors
Conservatories
Roof Lanterns
Double Glazing
Replacement Roofs
Plantation Shutters
Details
- Year established: 1975
Highlights and features
- We have over 40 years of experience in double glazing installations.
- Our products are BBA and BSI accredited for quality assurance.
- We operate with no-pressure sales and in-house fitting teams.
- We are endorsed by Which? Trusted Traders with excellent reviews.
- All installations include a 10-year guarantee on materials and workmanship.
Associations and certifications
- FENSA
- Secured by Design
- BBA
- BSI
What people say
Professional experience
Happy with windows
No need to redecorate
Workman courteous
Third-time customers
Services
uPVC Windows
Our A-rated uPVC windows feature multi-chambered profiles for superior thermal efficiency and security. Available in casement, tilt-and-turn, and sash styles, they reduce energy bills while enhancing property aesthetics. Customisable with Georgian bars, chamfered beading, and a choice of colours, these windows are ideal for both period and modern homes in Surrey and beyond.
Composite Doors
Engineered for security and durability, our composite doors combine reinforced frames with high-quality glazing options. Available in white, wood-effect, or coloured finishes, they offer enhanced insulation and a choice of hardware. Backed by a 10-year guarantee, these doors provide a stylish, low-maintenance entrance solution for residential properties.
Conservatories
Bespoke uPVC conservatories and orangeries are designed to maximise natural light and usable space. Styles include Victorian, Edwardian, and lean-to designs with dwarf walls or full-height glazing. Advanced glazing options ensure year-round comfort, while CAD visualisations help clients plan their ideal extension before installation.
Roof Lanterns
Skypod roof lanterns transform flat extensions with self-cleaning, temperature-controlled glass. Available in sizes from 1m to 4m, they feature U-values as low as 1.0 for energy efficiency. Customisable with colour tints and frame finishes, these lanterns brighten kitchens, orangeries, and home extensions without compromising thermal performance.
Bi-Fold Doors
Aluminium and uPVC bi-fold doors create seamless transitions between indoor and outdoor spaces. Slim sightlines and multi-point locking systems ensure security and aesthetics. Ideal for connecting homes to gardens, these doors are available in various configurations and finishes to match property styles.
Questions
What areas do Marathon Windowss cover?
We serve Epsom, Surrey, London, and the South East, including Croydon, Coulsdon, and Crawley.
Are your products energy efficient?
Yes, our A-rated uPVC windows and doors meet strict thermal efficiency standards to reduce energy bills.
Do you offer a guarantee?
All installations include a 10-year guarantee against warping, cracking, or discolouration.
Can I get a free quote?
Yes, use our online calculator for instant double glazing prices or contact us directly.
Are your installers accredited?
We are FENSA-registered and hold Secured by Design approval for security-compliant products.
What styles of conservatories do you offer?
We provide Victorian, Edwardian, lean-to, and bespoke conservatory designs tailored to your property.
Reviews (7)
Palma Valaydon
Oct 31, 2021
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I have used marathon windows on numerous occasions and they have always provided a great service. Delivered on time,great workmanship. Value for money.
John Woolley
Oct 06, 2021
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Marathon Windows were most professional in their approach when they quoted for and then fitted two new doors to replace rotting timber ones. The team was efficient and friendly, with excellent customer service and good timekeeping. We would use them again if the circumstances arise.
Jonathan Harrison
Sep 17, 2021
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Replaced the windows and doors at our scout hut. Cost effective, tidy and clean work with limited damage removing the old windows.
Antoinette Roberts
Sep 04, 2021
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Very satisfied from start to finish, 2 doors & kitchen windows all fitted well , would definitely use Marathon again...Great customer service
Ian Hadcocks
Jul 02, 2021
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We have used this company for double glazing, conservatory and porch over a number of years. They have always been helpful, efficient and their work is first class. Recommended.
Kelsey
Dec 28, 2020
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I just had my whole house fitted windows and French doors. The three gentleman that installed were brilliant and so efficient. Really respectful, cleaned up after themselves! The doors and windows look amazing. Really happy, can't recommend the company enough.
Carol Andrews
Dec 12, 2020
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I recently had work done by this company and can't praise them highly enough. The two men who came to put my door and window in worked very well as a team as well as on there own. Lots of banter but very respectful and tidied up after themselves. It was a pleasure to have them around. Whe I contacted the office all staff courteous and answered my questions quickly and efficiently. Thank you to all the team.
