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GuidanceHelpful guidance will appear here when you click on any options on this page.
Pole eyesAllow the use of a pole (not supplied) to help open and close the top sash of any sliding windows that are just too high to reach by hand. Manufactured from solid die cast zinc with a resilient surface finish and an sculptured ergonomic design. For windows less than 1000mm in width, 1 pole eye will be supplied loose. For over 1000mm width, 2 loose pole eyes will be supplied. They can be fitted wherever you prefer on the top rail of the top sash.
Slim midrailThe slim midrail is more than 10mm slimmer than its standard counterpart, it’s considered more authentic, matching the midrail on traditional Victorian sash windows.
Travel restrictorsDiscretely routed on the sides of the top sash the restrictors limit the opening of the sash for child safety, preventing the travel of the sash beyond about 10cm. To comply with building codes, a restrictor is fitted to both sides of the sash. It's easy to retract the restrictors allowing the sashes to slide open fully. These restrictors are keyless, so can be used for fire-exits.
D-handlesAn optional handle fitted at the outside of the sash window at the underside of the top sash, used for pulling the top sash down, once access is gained by tilting the lower sash inwards. One D-handle is fitted centrally for windows under 1200mm wide, and two spaced equally for windows wider than 1200mm. D-handles will be the same colour as chosen for the locks.
Bottom RailThese sash windows can come with a normal bottom rail, or a "deep" bottom rail to mimic the timber sash window look as much as possible.
Shoulder heightThe shoulder height for a swept-head arched window is the distance from the bottom of the window to where the arch starts as shown in the image:
HardwareLocks: engineered for strength and premium security for vertical sliding windows. Simply turn the lever or the key to release the cam from its keep. With colour coordinated screws. In standard or heritage form. With or without a key.
Knobs: made of a solid die cast zinc construction. Used to tilt the bottom sash. In standard or heritage form.
Lift hooks: enable the lower sash to be pulled and slid upwards.
Window coloursAvailable in many colours, including stunning authentic woodgrains to bring your windows to life with a glossy, realistic timber effect. For a true personalised touch, a bespoke colour service is available in your desired RAL colour with either a smooth or woodgrain finish. Some colours need approximately 4 weeks extra for delivery. Please see the colour selection pop-up.
Please note that on windows with different inside and outside colours, the top sash is not able to tilt. Disclaimer: we cannot guarantee to match existing colours. If you need a colour match, please email us with your address and ask for a sample of the colour you need. Fire escapeWindows for fire escapes must provide an unobstructed opening of at least 0.33m². An improved mechanism for slightly wider opening of the sash window. Fire escape windows should not have a lock on them.
Habitable rooms require fire escapes, Building regs.
Corner options
Standard sash welds:
Typical 45° mitre weld finish. The ends of the frames are cut diagonally at 45° so they come together in a 90° angle. The outer frames will still be mechanical as a free upgrade. Mechanical sash joints:Sash frame ends are joined at 90°, replicating the handcrafted appearance of the original corner joints of traditional timber windows. Free outer frame upgrade to mechanical joints! Now mechanical timber looking joints as standard for the outer frame, for an authentic finish that carefully disguises the UPVC. Excluding arched and swept head windows.
Sash hornsEnhance your window by choosing fantastic run-through horns. These horns are mechanically jointed to allow the horn to be a continuous part of the sash.
Weather barOptionally an innovative ovolo shaped weather bar that not only offers authentic period aesthetics but also adds another level of defence against rain and wind.
PAS 24 securityEnhanced security PAS 24:2016 security standard that can only be achieved once a product has been tested to demonstrate enhanced protection against various types of attack. Intended to resist the levels and methods of attack experienced in Britain. Building Regulations compliant, if laminated/acoustic glazing has been chosen for easily accessible windows. Choosing PAS 24 will add premium locks, top sash security blocks, upgraded latches and keep.
Integrated cillSash windows incorporate a fixed bottom cill with an upstand at the end. The cill is integrated and actually forms the bottom part of the window frame. Two cill depths are available: 150mm cill: When no projection is needed, for example if the window sits on top of an existing stone cill. 210mm cill: If the window requires a projecting cill to drain water away.
Trickle ventVents are placed at the top of the top sash to allow limited airflow without having to open the window. They help to control outside air flow reducing condensation and mould. The vent comes with a flap that can be opened and closed. Available in smooth and woodgrain finishes colour-matched to the sash frame. Please take care not to damage the vent when sliding the lower sash up. Vents are important to help with compliance with the new Part F regulations. Depending on the window width a small 2500mm² EA (Equivalent Area) vent or a larger 5000mm² EA vent will be supplied.
Building Regulations apply to ventilation.
Fixing bracketsOptional fixing brackets are available. Screws are not supplied. Available in standard or long for new-builds as illustrated:
Spacer barEvery double glazed unit, has spacer bars between the glass panes. In this case it's a warm edge spacer bar made from extruded PVC material designed to reduce transference of heat between the panes of glass keeping more heat inside the property. Available in black, grey or white. Please note: on arched windows, only black spacer bars are available.
Glass typesApart from clear glass, we offer 6 obscure types with a privacy level from 0 (clear) to 6 (solid). Westminster glass Level 2 Contora glass Level 3 Leaf glass Level 3 Stipple glass Level 4 Bark glass Level 5 Satin glass Level 5 Georgian BarsAstragal bars: these are the perfect addition to any Georgian window. Astragal bars are fitted onto the window glazing internally and externally. They will give the window a classic appearance and the illusion of multiple panes of glass. These external astragal bars match the profile of the window and they are 20mm thick.
Internal bars: will also create the appearance of separate panes. These 18mm thick bars are inside the glass unit making the windows easier to clean.
Instructions:
Please choose your own number of horizontal and vertical Georgian squares, or leave it on automatic where the actual layout will be set according to best practice. Or choose the special drop down list for special layouts. Small adjustments to align the bars between panes will be done at the factory. For custom layouts please leave a note at checkout. Frame extendersA frame extender allows to increase the thickness of the window at a specified side. Great for properties with deep plaster, render or tiles over tiles. 15mm, 30mm or 50mm extensions available. Some fitters buy extenders as a precaution, for example where the window opening has not been built yet. Extenders can be modified to accomodate inconsistent side walls. Extenders simply clip or slide on the window profile as you can see the picture. Important: The thickness of any chosen extenders is included in the chosen window width/height. If you wish to add an extender without automatically decreasing your window's width or height please add a note at checkout.
Glass safetyWe supply 3 strengths of glass:
Standard: Normal glass, which is dangerous when broken as it breaks in large sharp pieces. Toughened: Specially treated to increase its strength and safety. Laminated: Our strongest glass, similar to a car's windscreen, has a laminated layer that keeps the glass together when broken, making it very difficult to break into. Please choose Acoustic glass to enable laminated glazing. Windows near floors & doors require Toughened glass, Building Regulations.
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© 2014-2025 Burbage Custom Windows Ltd, Company No. 02961904, registered in England & Wales. VAT No 620285663.
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