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

Alternatively visit us at our uPVC Sash Window page for more information on sash window prices:

White uPVC Windows and Doors: £3000

Solar gain is referred to as g-value (gain value), this measures the solar heat energy that is able to pass through a glass sealed unit into a property. The solar gain reduces the need for domestic heat sources such as radiators while the low heat loss of the windows means that the heat is not lost.

Sash Window Prices | uPVC Sash Window Prices | uPVC Sliding Sash Windows

Light Oak / Mahogany / Rosewood uPVC Windows and Doors: £3660

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.

More information in the external doors section of our website:

An A+ rated uPVC window can be achieved in many formats, typically a thermal outer frame and thermally reinforced opening sashes will be used as well as warm edge spacer bars within the glass units. Then a high performance glass will be specified, for double glazed units a double soft coat low-e glass unit configuration will achieve an overall A+ rating.

Unfortunately this leads to the loss of around 4000 jobs from hundreds of stores across the UK.


High quality conservatories manufactured and installed in Doncaster.

Heat loss is quantified as a u-value and is measured in kW loss per m2 of window area per year, the lower the u-value the more efficient your windows will be. Here is a brief history of u-values over the decades an how u-values have improved:

Visit our composite door page of our website for more informatio:

High quality uPVC windows and composite doors are designed to minimise heat loss by combining a range of design factors. These are explained here

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1) Multi-chambered extrusions – The multi-chambered design of our uPVC case frames and opening sashes means that there are several air gaps protecting the internal warm air from the external temperatures, this vastly reduces conduction as air is a highly effective insulator.

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3) Thermal Spacer Bars – Separating the panes of glass are spacer bars, traditionally made from hollow aluminium to house desiccant, these would conduct cold from the external pane of glass and reduce the temperature of the internal glass pane, leading to cold spots. This can be seen by condensation forming around the perimeter of the glass on cold days. To combat this a new composite material is used which does not conduct the cold, this is known as WarmEdge spacer bars, usually coloured black to make them less obtrusive.

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4) Low Emissivity Glass (low-e glass) is a term that describes glass that has thermally efficient coatings to reflect heat radiation, this stops the vast majority of heat from escaping, thus reducing heat loss. Several forms of low-e glass are available, the most efficient of which is ‘soft-coat’ low-e glass such as Saint-Gobain Planitherm glass.

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5) Thermal reinforcement has now replaced steel and aluminium frame reinforcement, this is again acts to reduce the conduction of cold which leads to heat loss. Thermal frame reinforcement is far more thermally efficient than metal reinforcement while retaining the strength.