• Welcome to

    Marathon Windows

    Supplying quality uPVC windows, doors and conservatories throughout Epsom, Surrey, London and the South-East.

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  • Bi-Fold Doors

    Origin Aluminium Bi-Fold Doors

    Elegant and energy efficient aluminium bi-folding doors from Origin. Highly secure, with easy operation and in a range of colours and configurations.

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  • uPVC Bi-Fold Doors

    Super Sleek Bi Fold-Doors

    Our contemporary bi-folding doors will open up your home with their ultra slim-sightlines and elegant uPVC profile.

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  • Double Glazed Windows

    Stylish uPVC Windows

    We offer the latest uPVC window styles, glazing and finishes so you can achieve the perfect match for your property.

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  • uPVC Conservatories

    Bespoke Conservatories

    Beautiful and energy efficient uPVC conservatories in a wide range of styles and roofing options.

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Our Products



We provide a comprehensive range of window styles in Surrey. Choose from a stylish collection of uPVC casement windows, tilt and turn windows, sash windows and coloured windows. You can even get an instant online window cost using our double glazing prices calculator.

Quick Look at benefits

  • A Rated Thermal Efficiency
  • BBA Certified
  • Multi-Chambered Profile
  • Secured By Design Approval
  • A Choice of Glazing Options




Our double glazed doors are design-engineered for superior efficiency and security. They provide the ultimate home protection whilst offering beautiful, long lasting aesthetics. Choose from our latest range of residential doors, stable doors, bi-folding doors, patio doors, French doors and composite doors.

Quick Look at benefits

  • High Security Locking Systems
  • 10 Year Guarantee
  • Low Threshold Options
  • The Latest Styles, Finishes and Glazing
  • Strong, Energy Efficient Profile



We offer beautiful, bespoke conservatories and orangeries in Epsom, Surrey. All our uPVC conservatory styles are uniquely crafted to meet your property requirements. We have a stylish choice of conservatories and orangeries, with builds to suit every type of property.

Quick Look at benefits

  • Advanced Glazing Options
  • Modern & Traditional Conservatory Styles
  • Weather Proof Materials
  • High Thermal Efficiency
  • Enhanced Light and Space




Marathon Windows are experts in the installation and replacement of roofline products. Our quality uPVC roofline soffits, fascias, soffits, guttering and cladding are all designed to be fully weather-proof and extremely low maintenance so you can enjoy years of lasting roofline protection.

Quick Look at benefits

  • Enhanced Weatherproofing
  • Low Maintenance and Easy To Clean
  • Durable uPVC Materials
  • A Choice of Styles
  • Clean Appearance


uPVC Double Glazing in Epsom, Coulsdon and Surrey.

Marathon Windows are trusted installers of conservatories, orangeries, garage conversions, solar panels, double glazing windows & doors in Surrey, London and the South-East. We provide high quality, thermally efficient double glazing in Epsom, Coulsdon, Mitcham, Croydon, Leatherhead, Thornton Heath, Bromley, Redhill and Dorking. We have been installing high quality aluminium and uPVC windows and doors since 1975. That gives us years of experience on other suppliers - you can certainly count on our team to deliver exceptional results.

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What others say about us

  • I first used Marathon 12 years ago. You are still quality and value for money. Thanks.

    -Mr Nuttman, Surrey

  • Very good standard of workmanship – would definitely use again! Many thanks.

    -Mr Wilks, Surrey

  • Thank you for your professional assistance from start to finish.

    -Mrs Hayward, Surrey

  • We are very pleased with our new windows. We thought we would need to re-decorate once new windows were fitted, but are really pleased with the finish and there’s no need to re-decorate. Thank you!

    -Mrs Wentworth, Surrey

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