Double glazing an original sash window in a listed propery
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![Double glazing an original sash window in a listed propery Double glazing an original sash window in a listed propery](https://londonsashwindows.com/wp-content/uploads/2017/06/thin-double-glazing.jpg)
A single glazed sash window that has had the original glass and putty removed, ready for an installation of a slim double glazed unit.