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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 10. PLANNING AND DEVELOPMENT |
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SubTilte 10-C. HISTORIC PRESERVATION |
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Chapter 10-C23. STANDARDS FOR WINDOW REPAIR AND REPLACEMENT (WINDOW STANDARDS) |
Section 10-C2306. WINDOW REPLACEMENT: HISTORIC LANDMARKS
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2306.1Principal Facades
(a)If historic windows cannot reasonably be restored, replacement windows shall be approved if they match the historic windows in all respects—configuration, method of operation, profile, dimensions, material, finish, and any other salient character-defining features. A stricter standard of reasonableness shall be applied to special windows.
(b)Variations in profile shall be permitted if these variations do not significantly affect visual characteristics of the historic window. In evaluating "significant" effect, factors to be considered shall be the age of the building, its architectural quality, and the extent of diminution in the total glazed area of the sash. Exact replication of profiles may be required if warranted by the significance of the historic building,
(c)The color of replacement windows shall match or approximate the historic color of the historic windows, if this can be determined. Otherwise, the color shall be historically appropriate.
(d)With respect to matching of materials, it shall be understood that a wood historic window shall be replaced in wood, but not necessarily of the same species. A metal historic window shall be replaced with metal but not necessarily of the same metal. Exact replication of materials may be required if warranted by the significance of the historic building.
(e)Replacement of windows in a different material shall require approval by the Board.
(f)Alteration of window openings shall generally require approval by the Board. For basement openings not visible from a street or public open space, or only marginally visible, the staff may approve alterations that do not compromise historic or architectural characteristics.
2306.2Secondary Elevations
(a)If existing windows are visible from a street or public open space, a permit shall be issued if replacement windows match the historic windows in terms of configuration, method of operation, profile, dimensions, and finish, and provided that they do not replace special windows. Matching the material is encouraged but not required.
(b)If existing windows are not visible from a street or public open space, a permit shall be issued if replacement windows reasonably match the historic windows in terms of configuration, method of operation and dimensions, and provided that they do not replace special windows.
(c)Alteration of window openings is discouraged, but some flexibility may be applied.