Timeless Flush Windows

Seamlessly combining the low maintenance perks of uPVC with the undeniable authenticity found with traditional timber frames, our timber-effect flush sash windows give installers the tools needed to cater for classic builds. Decorative features and authentic finishes combine with modern design to make for uPVC frames that offer history without hassle.

We at GJB fabricate and supply all timeless flush sash windows with A+ rated energy glass as standard, allowing you to easily exceed required Building Regulation Standards. The result is a window capable of keeping properties well-insulated with some of the lowest U-values achievable on the UK market today.

Tradesmen can feel confident that all the performance and installation issues found with original timber windows have been left in the past. We know this because every timeless flush sash window comes handcrafted by our workmen in-factory, creating industry-leading retention levels and maintaining the decorative charm end users look for.

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Authenticity, performance, and security combined

A classic window style given a modern edge


In addition to impressive style and performance, timeless flush sash windows are well-equipped to keep properties protected. Manufactured under BS7412 and BS7413 standards, multi-point locking comes integrated to offer clients absolute peace of mind. A written guarantee also contributes towards this, letting the frames be truly ‘timeless’ in every possible manner.

  • Technical
  • Colours
  • Technical

    A+ energy rated performance as standard

    Full 70mm, 5 chambered profile system

    Available double or triple glazed

    15-year written guarantee

    Manufactured under BS7412 and BS7413

    Exceptional weatherproofing and air tightness

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    Colours

    Timeless Flush Sash windows are available in the following colours:

    White

    White

    Chartwell Green

    Chartwell Green

    Irish Oak

    Irish Oak

    Cherry

    Cherry

    Siena PN

    Siena PN

    Rosewood

    Rosewood

    Wine Red

    Wine Red

    Moss Green

    Moss Green

    Steel Blue

    Steel Blue

    Slate Grey

    Slate Grey

    Anth. Grey

    Anth. Grey

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    Timeless Collection

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    Becoming a GJB approved installer can help increase sales and improve company reputation

    Trade support package

    Additional materials and advice for improved sales

    Fully Accredited Products

    Window and door range that exceeds Building Regulations

    Continual innovation

    GJB stay at the forefront of innovation with fresh products

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    Find out more about our products


    Head Office

    21 Totman Crescent, Brook Road Industrial Est.,
    Rayleigh, Essex, SS6 7UY

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    Factory's

    6, 21 & 23 Totman Crescent, Brook Road Industrial Est.,
    Rayleigh, Essex, SS6 7UY

    Facilities: Collections

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    By submitting your details you confirm that you agree to the storing and processing of your personal data by GJB Developments Ltd as described in the privacy statement.