Bespoke High Quality Heritage Windows

Quality with a lifetime guarantee

Exacting time-honoured techniques with modern energy performance to preserve the heritage of your home.
For a free quotation please call 01753 858196.

Get a free quote

All our decorative leadwork is made using traditional methods by time served craftsmen, with high quality materials and a lifetime guarantee.

Get a free quote

At The Original Box Sash Windows Company we have been manufacturing and installing beautiful hardwood windows for more than 40 years.

We are unique in our industry in offering you a lifetime guarantee. That’s because we use the best timber, components and build them with such precision, we know they can last a lifetime.

Request a Quotation

Our experienced estimators are available to survey your property and guide you through the many options that are available to you.

    Solid hardwood timber for a lifetime of use. No softwood. No imitation hardwood.

    We are specialists in listed, period and conservation properties, specialising in bespoke timber sash and casement windows in Victorian, Edwardian and Georgian period properties. Our bespoke heritage windows provide optimal thermal and acoustic performance preserving the authenticity of historical buildings.

    We liaise with your Local Planning Authority and guide you through the entire process, from the initial planning application to design, survey, manufacture and installation.

    We work in partnership with FINEO Heritage to preserve your historical facades. With its Heritage products, FINEO is the renovation solution that preserves the authenticity of historical buildings, where it is usually impossible to replace the original glass with modern double glazing. FINEO preserves the charm of the building while providing state-of-the-art thermal comfort, reducing noise levels and letting in more light.

    FINEO Heritage offers a choice of six types of restoration glass suitable for historical buildings and homes. FINEO Heritage glass is the best solution for preserving the visual appearance of glass installed from the 1880s through to the 1960s.

    Why choose the original box sash windows company?

    Lifetime guarantee on every frame

    10 year glazed unit guarantee

    Enhanced energy performance

    Sustainably sourced highest quality materials

    Tailored to the character details of your home

    Hand crafted double glazing as standard

    Secure multipoint locking mechanisms

    Superior quality & low maintenance

    Finished with high quality microporous paint


    We manufacture all our own glazing units to ensure maximum thermal insulation and acoustic properties, utilising double glazed safety glass as standard. In fact, we were the first to develop and patent double glazed sash windows.

    We can also tailor the glazing to your exact requirements – incorporating other glazing styles and specifications such as toughened and laminated glass, acoustic glass, and textured, obscured or stained glass.


    All of our traditional timber windows feature authentic mouldings that will perfectly complement your property. Our bespoke internal mouldings are created to match the original mouldings in your home, while outside detailing such as glazing bars and horns are matched to existing features.

    We can also finish our windows in your preferred colour. Just quote us your chosen paint and reference and we will make an exterior quality paint to match.


    For the perfect finishing touch, hardware, including handles and hinges, can be supplied in antique brass, chrome, satin chrome, black and pewter. Bespoke fittings can also be arranged on individual specification.

    Lifetime window frame guarantee

    Our industry-leading sash window frames come with a life time guarantee insured by the Independent Warranty Association (and all glazing units come with a 10-year guarantee). We want you to be as confident in your new windows as we are.

    Enhanced energy efficiency

    Your double-glazed sash windows will be flush-sealed and Argon-filled to maximise insulation and sound-proofing, so you can reduce your energy bills without compromising on authenticity.

    Individual details as you require

    If you want to finish your sash window in a certain colour, add some stained glass or even upgrade to curved glazing, we can accommodate your individual needs to match your home perfectly.

    For more information or to arrange a home visit for a quotation please contact us on 01753 858196 or email