Box sash windows

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.

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Sash windows that don’t just look like the real thing; they are the real thing.

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The Original Box Sash Windows Company have been producing and installing beautifully hand-crafted hardwood windows for more than 40 years.

We are unique in our industry in offering you a lifetime guarantee. Using sustainable, high quality timber to craft our elegant windows with precision, we know they will last a lifetime.

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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.

    Crafted from the highest quality sustainable hardwood, our windows offer a range of unparalleled beauty and performance with lifetime guarantees.

    As The Original Box Sash Windows Co., our founder designed and patented the double glazed unit for use within the sash window, revolutionising the sash windows and preserving its heritage.

    Featuring classic mouldings, traditional timber horns, and counter-balance, pulley and cord systems, our individually crafted windows deliver a truly timeless and authentic finish.

    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