Installing interior storm windows with airtight gaskets , ventilating holes , and / or removable clips to insure proper maintenance and to avoid condensation damage to historic windows .
Installing exterior storm windows , which do not damage or obscure the historic windows and frames .
Not Recommended Changing the number , location , size or glazing pattern of windows .
Cutting new openings for windows , or installing replacement sash , which does not fit the historic window opening .
Changing the historic appearance of windows through the use of designs , materials , finishes , or colors which radically change the sash , depth of reveal , and muntin ( the cross pieces dividing the panes of glass ) configuration ; the reflectivity and color of the glazing ; or the appearance of the frame .
Stripping windows of historic material .
Removing or blocking in a window ; or replacing a window with one that does not convey the same visual appearance .
Installing new floors or lowering ceilings , which cut across the glazed areas of the windows so that the exterior form and appearance of the windows are changed .
Removing or radically changing windows , such that the overall historic character is diminished .
Obscuring windows with historic trim with metal , solar screens or other material . ( 3 ) Porches and Entrances Recommended
Using large sheets of glass which are recessed behind the existing scrollwork , post and balustrades ( a section of low " fencing " consisting of intermittent supporting posts and horizontal rails with balusters or crossbars in between ) for porch enclosures .
Using the remaining feature as a guide for replacement if the porch or entrance is destroyed or deteriorated beyond repair . It may also be restored based on historical , pictorial , and physical documentation or a new design that is compatible with the historic character using the same type materials if the original material type is not available .
Not Recommended Enclosing the porch or entrance using wood or masonry . Altering or removing stoops or hand-rails . *