When the lower glass pane of the sash window is below 800m from internal floor height toughened safety glass is required to comply with building regulations for glass safety. Toughened safety glass increases the price of the glass by 20 pounds per square meter over standard low-e glass.

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Morality and Personal Responsibility

Over the past 3 years double glazing technology has moved forwards at an impressive rate of development. We are not able to offer double glazing units that have a u-value of 0.6! When compared to 3 years ago the standard double glazing unit had a u-value of 1.8. The u-value of a glazing unit measured the amount of thermal transmittance through the glass unit, therefore the higher the uvalue the more thermal energy (heat) is being lost through your double glazing.

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It is now widely regarded that the cylinder lock is potentially the weakest point of a door and is very easy to break into; this is why we recommend installing anti-snap cylinder locks which protect against the following:

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The maximum and minimum sizes for uPVC sash windows are as follows:

As the existing wooden sash windows will be thicker than upvc casement windows the angles will definitely be different and must therefore be carefully surveyed by an experienced surveyor. Many companies will advise you to retain the existing wooden bay canopy and wooden bay posts as this is easier to install than a full replacement. This is not advised as there is no way of knowing the internal condition of the wooden bay posts; as the posts are load bearing we recommend replacing these with uPVC clad aluminium bay posts with additional bay jack reinforcement.

White uPVC Windows and Doors: £3000

Many properties in Sheffield are fitted with sash bay windows; careful consideration must be taken when replacing a large wooden bay window for upvc casement windows or sash windows.

Thank you. We will try to publish a PDF by the end of next week. Please stay tuned. – Michael

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However at AWM Windows and Conservatories we strongly advise that people still consult the Doncaster council to ensure that the conservatory does not require planning permission. AWM are able to offer free advice on planning laws to anyone within a 50 mile radius of Doncaster.

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Specifying a level of high performance glass can affect the price of your new upvc sash windows, the lower the u-value the more expensive the glass. At AWM we recommend specifying the best glass possible; this is more of a long term investment but it helps to keep you comfortable during the Winter months and cooler in the Summer months.

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How does a window minimise air leakage?

The bay canopy can either be retained or replaced for a new tiled roof or custom made GRP (fibre glass) canopy. The least expensive option is to install a GRP canopy; these are not only cheaper to install but will require no future attention. Alternatively you may wish to install a new tiled roof which will involve a specialit joiner being on site whe the windows are being installed in order to match the dimensions of the new bay window to the custom made roof. The tiled roof must then be finished internally with a new plastered ceiling.