Plate Glass Plate Glass is costly to replace and certain businesses find glass insurance an important part of their insurance portfolio. This applies particularly to retail shops, Hotels , department stores, showrooms, etc. where shop fronts and window displays play an important role in attracting business. The Glass Policy pays the cost of replacement of all external glass following breakage at the business premises. The Glass Policy may be extended to cover special types of glass which are very expensive to replace such as silvered, wired, ornamental, stained, lettered, toughened and armored glass.