Handcrafted Replacement Sash Windows

Through our use of innovative manufacturing methods and the highest quality timber, we can ensure the charm of your period home is retained. Whether you own a Victorian, Edwardian, or Georgian property, our replacement sash windows are handcrafted and employ traditional joinery methods. Incorporating sustainable materials, our replacement windows allow for improved energy performance, lifetime durability and enhanced security, while still celebrating authentic architectural charm.
For a free quotation please call 01753 858196.

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Replacement window considerations

As with all our window installations, our replacement wooden windows are created using the same bespoke requirements. But depending on the location of your property, the conservation act may dictate factors we need to consider when replacing sash windows. These can include:

  • That the replacement frame designs and dimensions conform to the specifications of your area
  • If greater insulation properties can be permitted in your location
  • The use of single glazing adhering to the specifications of surrounding properties

However, if there are no conservation rules affecting the types of sash windows which can be fitted, this allows us to install double or triple glazing, which provides enhanced energy efficiency.

Security and Guarantee

As with all our sash windows, our replacement windows feature secure multipoint locking mechanisms for optimum security. Plus, all the frames for our timber sash window replacements come with a 30-year guarantee, and Box Sash also provides a 10-year glazing guarantee. These are insured in accordance with the Independent Warranty Association, helping you to feel as confident about your replacement windows are we do.

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    Our handcrafted sash windows ensure the charm and authenticity of your period home is maintained, whilst offering exceptional levels of comfort, security and performance.

    Your existing window frames may have stood the test of time and only your sashes require replacement.


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

    Why choose the original box sash windows company?

    A 30-year 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.

    30-year window frame guarantee

    Our industry-leading sash window frames come with a 30 year 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 info@boxsash.com