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It is the visible spacer bars and double reflection (resulting from the two planes of glass) which clearly identifies double-glazed units as modern fixtures, critically undermining the period character of historic listed buildings. Whilst there is no objection to the principle of incorporating double-glazing to modern extensions, the units must be as slim as possible to ensure that the double-glazing is as discreet as possible. The glazing to the door at No.46 is 25mm thick, which is excessive.
There is a general presumption against the application of applied glazing bars to the windows / doors of listed buildings, due to their uncharacteristic and highly modern appearance; and the fact that they emphasise the existence of the double-glazing. The two sets of glazing bars (to the inner and outer sides of the glass) are also clearly visible. As per the Historic England guidance: "...glazing bars are sometimes simply applied onto one double glazed unit which gives a very flat lifeless feel to the window." Applied glazing bars are also more vulnerable to damage and have been known to fall off windows / doors. The applied glazing bars to the upper ground floor door at No.46, further emphasise the double-glazing and give the door an uncharacteristically modern appearance. This door is not of sufficient quality in design terms, and harms the appearance of this traditional extension and the overall rear facade.