Avino, Sky House, Raans Road, Amersham, HP6 6JQ
Traditional Box Sash Windows have been designed to combine the natural beauty of timber with the performance standards expected of modern architectural glazing systems.
Developed using engineered timber construction, hardwood detailing and high-performance double glazed Low-E units, these windows provide excellent thermal efficiency, weather resistance and long-term durability while preserving the authentic appearance of historic sash windows.
Designed for heritage, conservation projects and luxury residential developments, Traditional Box Sash Windows retain the classic proportions and operation that have defined British architecture.
The traditional cord, pulley and counterbalanced sash mechanism allows for smooth vertical sliding operation while discreetly incorporating modern manufacturing techniques and glazing technology to enhance comfort, energy performance and reliability.
Available in a range of carefully selected timber species including hardwood, Accoya and European oak, Traditional Box Sash Windows can be fully customised to suit individual project requirements.
With bespoke dimensions, glazing specifications, moulding profiles and a wide choice of painted or stained finishes, each installation is curated to complement the character of the building while delivering the performance required for contemporary living.
Looking to transform your space with Avino? Get in touch with us.
Specification
The Configurations of a Traditional Box Sash Window
Traditional Box Sash Windows can be configured to suit a wide range of project requirements, including fixed light arrangements, coupled windows, and bay or corner installations.
Each system is manufactured to bespoke dimensions, with clear opening sizes determined by sash configuration and overall frame proportions.
The Performance of a Traditional Box Sash Window
The system is designed to deliver reliable thermal, acoustic and weather performance, with window U-values ranging from 1.4 to 1.5 W/m²K and acoustic performance between 33–39 dB. High levels of weather resistance are achieved, including Class 3 air permeability, Class 5A water tightness and Class 4 wind resistance.
What Materials Are Used in Traditional Box Sash Windows?
Traditional Box Sash Windows are manufactured using engineered timber, with options including hardwood, Accoya and European oak to suit durability and project requirements. A factory-applied, three-coat microporous paint or stain finish provides long-term protection while maintaining the natural characteristics of the timber.
Maximum Size of a Traditional Box Sash Window
Maximum window dimensions are determined by sash weight, glazing specification, timber selection, wind loading and project-specific performance requirements. All Traditional Box Sash Windows are engineered to suit the individual application, with maximum sizes reviewed and confirmed during the technical design stage.
Where larger openings are required, bespoke frame designs and glazing configurations can be incorporated to maintain smooth operation and achieve the required structural and weather performance criteria.