Traditional Aesthetics Match Modern Performance

At Trade Windows Bristol, we offer a flush sash window that replicates the original features of timber casement windows while offering superior thermal performance. Read on to discover why this unique window is the right fit for your next installation.

  • Features
  • Dimensions
  • Styles
  • Appearance
  • Downloads
  • Benefits
  • Features


    • Achieves 1.8 W/m²K / WER A+ with double glazing
    • 6 chambered outer frame design with recycled thermal (RCM) inserts for improved thermal performance
    • Standard Optima outerframes and packers can be used to deal with the variations in older properties
    • Standard co-extruded gasket plus optional second and third weather seal aids thermal performance



    • Cill sizes from 85mm to 225mm
    • Couplers available in a range of sizes from 3mm to 29mm
    • Packers available in four sizes ranging from 15mm to 50mm



    Top Hung & Side Hung

    Our uPVC flush sash windows, meticulously designed for installers, feature top-hung and side-hung configurations. The top-hung flush sash windows exhibit a contemporary aesthetic with a bottom-opening mechanism, providing excellent ventilation and heightened security.

    Alternatively, our side-hung flush sash windows offer a touch of timeless design, effortlessly swinging open for easy access and cleaning. Crafted with precision and premium materials, our uPVC flush casement windows ensure durability and a streamlined installation process.

    Multi-Pane Configurations

    Benefit from unparalleled versatility for your uPVC flush sash window installations, taking advantage of our capability to create variants from sleek single-pane designs to flexible four-pane configurations.

    Whether you lean towards a minimalist aesthetic with a single pane or seek enhanced functionality and visual appeal with multi-pane layouts, our manufacturing capabilities cater to your specific flush sash window installation requirements. Each variant undergoes precision engineering, guaranteeing it meets the highest standards of quality, durability, and energy efficiency.



    • Authentic shape to the frame, bead, sash and cill plus optional Georgian bars, sash horns, weather bars and a deep bottom rail
    • Large and small sash profiles give equal sightlines to the top and bottom sashes



    Find all the information you need here


    Chartwell green uPVC window

    Benefits of uPVC Flush Casement Windows from Trade Windows

    Effortless Installation
    The Optima Flush Sash system is engineered for easy fabrication and straightforward installation. Minimise installation time and effort without compromising on quality.

    Versatile Application
    From heritage properties to contemporary projects, our uPVC Flush Casement Windows offer versatility to suit a range of architectural styles.

    Security Assurance
    Your clients' safety is paramount. Our windows meet the stringent standards of PAS24, providing enhanced security features. Offer peace of mind to end users with robust and secure installations.

    Customisation Options
    Tailor your installations with ease using our range of customisable options. Choose from various colours and finishes to complement your clients' preferences and match the overall design aesthetic.

    Efficient Maintenance
    Optimise post-installation support by offering windows that are not only visually appealing but also easy to maintain. The Optima Flush Casement system ensures hassle-free upkeep for your clients.

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    Diverse Styles for Seamless Installations

    Efficiency Meets Tradition
    Opt for our Flush Sash style that effortlessly combines traditional aesthetics with modern efficiency. Replicate the charm of historical designs while enjoying the advantages of PVC-U materials for a hassle-free installation.

    Precision with Mechanical Joints
    Achieve a carpenter-finished look without the complexity. Our mechanically jointed sashes and outer frames provide a precise appearance, eliminating mitred welds for a clean and efficient installation process.

    Authentic Deep Bottom Rails
    Attention to detail matters. With deep bottom rails, specially designed for authenticity, ensure that your installations capture the essence of traditional design without sacrificing ease of installation.

    French Casement Windows Made Easy
    Enjoy classic lines and proportions along with practical features like a full-width opening for enhanced ventilation.

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    Black uPVC window

    Wood Grain and Timber-Look Flush Sash Windows

    Realism Beyond Expectations

    Our wood grain finishes are crafted to deliver an unparalleled level of realism. Bringing the authentic feel of timber with finishes that closely mimic the natural textures and grains found in real wood.

    Unlike traditional timber, our wood grain finishes are engineered for durability. Offer the timeless elegance of wood without the worry of issues like rotting, warping, or constant maintenance.

    Choose from a diverse range of wood-inspired finishes to match the character of any property. From the simplicity of Light Oak to the deep hues of Rosewood, our palette allows you to customise windows to suit.

    Timber-look flush sash windows from Trade Windows not only capture the classic charm of traditional designs but also deliver modern performance. Offer the benefits of energy efficiency, security, and easy maintenance, seamlessly integrated into a timeless aesthetic.

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    Perfect for Listed and Period Homes

    Preserving Historical Elegance
    The flush sash design perfectly aligns with the aesthetics of listed and period residences, preserving their historical elegance. These windows introduce a modern touch while steadfastly maintaining the architectural integrity of the property.

    Compliance with Conservation Area Guidelines
    For properties located in conservation areas, choosing flush sash uPVC windows from Trade Windows enables homeowners to meet specific requirements while still enjoying the benefits of modern functionality and efficiency.

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    CE BFRC ERC Smart Aluminium Spectus Residence Collection Optima Patio Master

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    Our team of technical advisors will be happy to help.

    0117 978 4444

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