Replacement windows on the primary, street-facing or highly visible elevations of tall buildings above a distinct base must match the historic windows in size, design and all details that can be perceived from ground level.The base may vary in the number of stories, but is generally defined by massing or architectural detailing. Replacement windows on the primary, street-facing or any highly visible elevations that are part of the base of high-rise buildings must match the historic windows in all their details and in material (wood for wood and metal for metal).Replacement windows on primary, street-facing or any highly visible elevations of buildings of three stories or less must match the historic windows in all their details and in material (wood for wood and metal for metal).Using the hierarchy of a building’s features and taking into account the window’s visibility, some general guidance can be drawn. For example, windows at or near ground level present a different case from windows in the upper stories of a tall building.
This will affect the nature of an acceptable replacement. Secondly, the location of the window can affect how much of the window’s features and details are visible. The more important the elevation, feature or space of which the window is a part, the more important the window is likely to be, and thus, the more critical that its replacement be a very accurate match. For example, the street-facing facade is likely to be more important than an obscured rear elevation. It is usually a consideration in determining the relative importance of a building’s various parts. The more important a window is in defining the historic character of a building the more critical it is to have a close match for its replacement. Evaluating the adequacy of the match of the replacement window involves the consideration of multiple issues. Design, visual qualities, and materials are specific criteria provided by the Standard that are pertinent to evaluating the match of a replacement window. When they are too deteriorated to repair, selection of the replacement windows must be guided by Standard 6. When historic windows exist, they should be repaired when possible.
The decision-making process for selecting replacement windows divides into two tracks depending on whether historic windows remain in place or no historic windows survive.
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