Retain historic windows where possible. Where replacement is necessary, new units should match the old in size, shape, and arrangement of panes. Window openings should not be reduced in size.
Whenever possible, choose new units of wood, rather than metal. If metal is selected, it should have a baked enamel finish.
Retain all decorative trim around windows, including lintels, pediments, and hoods.
Non-rectangular or irregularly shaped modern windows (such as trapezoids) should not be installed, especially on the front of the building.