Repair of damaged stained glass windows varies from a single shattered piece of glass to replication of several missing pieces.
Replacing a single broken piece of stained glass: It is possible to replace a single piece of glass without removing the window panel. A rubbing is made of the broken piece to use as a pattern to cut and, if necessary, painted to match the existing window design. The new piece of glass is then carefully installed into the damaged window.
Replacing several broken pieces of adjacent stained glass: This type of repair is more difficult to accomplish in place. Often the lead is mangled and/or stretched. Typically a repair of this nature requires the removal of the panel. New pieces of stained glass glass are cut and, if necessary, painted to match the existing window design. The lead in the damaged area is replaced with new lead came. Depending on the age and condition of the window, the recommendation may be to completely re-lead the damaged panel.