Bespoke sash window renovation

Combining the finest FSC Certified timber and patented moulding techniques, we are able to restore your sash windows with precision. Championing sustainable materials and handmade in Britain at our West London workshops, our expert craftsmen ensure the period character of your home remains intact.

Or sash window restoration service is fully bespoke, considering any of your unique requests. Plus, through utilising modern methods, this allows your Victorian, Edwardian, or Georgian windows to include enhanced energy performance, and improved security features, without detracting from the listed nature of your property.

For a free quotation please call 01753 858196.

Get a free quote

Sash window restoration considerations

The upmost care and attention is at the forefront of all our production methods, and when renovating sash windows, this is no different. However, sometimes the conservation act can outline restrictions which need adhering to, when restoring your sash windows. These can be:

  • That single glazing units are used adhering to specifications for surrounding properties
  • The frame measurements and design we use for restoring your old sash windows conform to the specifications of your area
  • Improved insulation properties, such as double and triple glazing, are permitted in your location

If the conservation act does not restrict the restoration methods for your sash windows, this lets us improve energy efficiency and provide more options for personalisation, such as paint colour choices and additional hardware.

Security and Guarantee

Part of our service when restoring your sash windows is improving the security of your existing windows. As standard, Box Sash windows are installed with multipoint locking systems for increased protection. Alongside this, our tailed glazing units come with a 10-year glazing warranty for any future damage they may incur.

Box Sash are also the only sash window restoration company to offer 30-years cover for all our wooden frames. Each of these guarantees are insured in accordance with the Independent Warranty Association, letting you feel confident in your restored window frames as we do.

Please fill in the form below and one of our team will be in touch.


    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?

    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