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Double Glazed Sash Windows

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  • Butler & Bowler

    UK landline: 020 8144 7144

    Ainars Kalnitis

    phone: 07769790887


    skype: butler-bowler


    Timber Windows

  • Sliding Sash Windows

    Butler & Bowler Sliding Sash windows are designed with the aesthetic of a traditional sash window, but have the benefit of modern high security features, engineered timber and double glazing which utilises enhanced insulating glass. Maintenance is a breeze.

    Butler & Bowler Sliding Sash windows maintain the aesthetics of traditional Victorian sash windows with the benefits of incorporating modern technology that include:

    Engineered timber to minimise seasonal movement and timber wastage.

    Double glazing to meet future energy saving requirements, (Part L, 2013)

    Low maintenance high performance finishes. Single glazed, double glazed or triple glazed options are


    Arched or curved wooden windows are available along with various options for bay windows for a home. If you are looking for conservation Victorian windows and want to know more simply call us for our advice.

  • Standard Design Features

    Dully Weather sealed

    Fully Weather Sealed Draft excluder discreetly installed in the box frame and meeting rails to eliminate rattle and drafts.

    22mm Glazzing Unit

    The optimum thickness of unit for thermal efficiency. This is the overall width of the glass unit.

    Anti Prise Clips

    Fixed to the middle of sashes and frames, these are for enhanced security

    Timber Baton Rods

    A Traditional Feature on the inside securing sashes in the frame.

    Top Hung

    A Traditional Feature on the inside securing sasHung horizontally, this style opens / swings out like an in the frame.

  • Optional Design Features

    Concealed Trickle Vents

    A discreet vent invisible from the outside is fitted to the head of the box frame. This qualifies the window to achieve Part F of the building regulations.

    Groove for Window Board

    A rebate to allow a location for the window board on the inside of the frame section.

    Curved Head

    A curved or rounded effect on windows, bullseye and oval windows are variant of the same theme.

    Concealed Restrictor

    Ironmongery fitted to the sash and frame which enables constraint on the opening of the window.

  • Traditional Range Features

    Various Cill Depths Including Sub Cill Option

    The ability to vary cill depths as well as an extension has been incorporated into the design.


    Horns can be applied to top sash, bottom sash or both. They are decorative features added to enhance the appearance from both the outside and inside.

    Angled Haed

    Angled windows ideal for screens and atriums for modern architectural designs.

    Arched Haed

    A gothic arched effect common on older buildings and barns.

  • Hidden Silicon

    Our silicone design takes into account the need for improved energy efficiency whilst retaining period aesthetics with only a discrete silicone bead surrounding the glass units.

    External Putty bead Design

    Our purpose made external mould detail has been designed to give the impression of an external putty bead with its angle and shadow groove. Importantly security has not been

    compromised with internal beading being retained.

    Internal Ovolvo Mouldings

    These add another important aesthetic feature with their elegant profiling.

    Slim Frame Sections

    In order to optimise glass areas and to retain period styling, The Traditional Range utilises slim frame sections.

  • Casement Windows

    Our flush casements retain traditional design whilst packing in all the modern benefits of weather proofing, security & energy efficiency. This includes larger rebates to accommodate double or triple glazing, draught sealing and high security multi-point locking hardware. As with all our windows the timber used is multi-layered, engineered timber and as standard the windows are double glazed with argon filled 24mm units (Ug value of 1.1W/m2K).

    We manufacture two styles of flush casement, the performance window which has a higher spec in that it is able to house triple glazing and accept aluminium cladding and our conservation window which has very unique styling that you will not find anywhere else.

    The slim line sashes are set back in the moulded frame which enhances the appearance of the windows and adds to the design of your property. With doors to match our conservation windows are unmatched for beauty and quality.


    Conservation Windows Performance Windows

    Unique window styling only available at Butler & Bowler.

    Energy saving glass to achieve Part L of building regs Ug value 1.1W/m2K.

    Traditional slim sash sections and thicker bottom rail.

    Concealed vents to achieve Part F of building regs.

    Exterior and interior frame detailing. Glazing to meet part N of building regs.

    Supplied fully glazed and finished. Fire escape option to meet part B of building regs.

    Available in any RAL colour or stain. Enhanced sound insulation available.

    Available in dual colour. Available as supply only or supply and fit.

    Choice of hardware.

    Constructed from engineered timber.

    Available in redwood, meranti or oak.

  • Timber Windows

    Tilt & Turn Windows

    Our tilt and turn casement option has been developed & tested to meet Passiv Haus Standard. If you are requiring optimum performance this is the solution you require.

    This window combines perfect performance parameters and a very low heat transfer coefficient. The overall heat transfer coefficient value for the test window achieved Uw = 0,8 W/m2K, which means that the window can be used for high performance eco house construction.

    The design also provides increased acoustic performance which insulates 34-db as standard with an option to sound insulate up to 42-db with enhanced glazing options.



    High performance German WINKHAUS Tilt & turn hinges fitted to allow for maximum performance and durability. The tilt position allows the window to hinge from the bottom and partially open for ventilation and the turn allows the window to fully open from the side. Locking handles are fitted as standard in a range of finishes. A concealed ventilation system can be incorporated for compliance with Part L. Our high performance paints and stains will maximise the life of your windows allowing maximum duration between maintenance. Unlike re-painting in the past the re-application of finish does not require laborious scraping and sanding. Modern micro-porous paint systems allow the timber to breathe preserving the integrity of the wood. When the time comes a light sanding over the window will provide a key to reapply the top coat.


    The Options Angled Head - Angled windows ideal for screens and atriums for modern architectural designs. Arched Head - A gothic arched effect common on older buildings and barns Concealed Restrictor - Ironmongery fitted to the sash and frame which enables constraint on the opening of the window. Curved Head - A curved or rounded effect on windows, bullseye and oval windows are variant of the same theme. Dummy Sashes - A non-opening light where sightlines look as though a sash is fitted in the frame. Flying mullion option - Used on 2 light narrow windows where fire escape is required. The mullion is fitted to the sash allowing maximum clearance. Large Sashes / Screens - Significantly larger sashes can be designed than for casements. Gives a clean look which maximises glass area. Night Vents - A device with a secondary keep position for locking cams. Allows windows to be ajar whilst still locked. Sliding Sash Look-a-like - A planted on section on side hung windows that gives a sliding sash horn effect.



    Contemporary Handles - available in Chrome Brown Gold Black - White


  • About Us We have a formidable portfolio of designs to offer: some have been included on this website though space and commercial consideration have kept us mindful of the need for brevity. This being said, even in our broader catalogue of designs, you still might not find the joinery component that perfectly suits the needs of your project. Don`t be disheartened, the chances are that we will be able to custom build a solution for any realistic concept that you, or your architect, might conceive. About UsOur design team, working both traditionally and with the latest computer modelling techniques are at your disposal for that special item for which a supplier might be difficult to find. Our methods are straightforward yet thorough. We work in many dimensions when approaching a conceptual design, not merely "lenght, breadth and depth": the element of time is integral to any joinery construction. How long will it last? What is the likely maintenance schedule? What materials might age most sympathetically with the item`s surroundings? Thought is also devoted to another important factors, e.g. how would the item best be transported to site? What is the least disruptive and most simple method of installation? What guidance might the fitting team re

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