There are many layers of value that you can discuss, research and deploy in the care and maintenance of your windows. All of this information has multiple uses to your community as you engage with your community, develop programs that fit the history and mission of your space, find your story within the greater context of your region's history, fundraise for the long-term care of your building, or just update your insurance paperwork.
More thorough information on appraisals and insurance can be found here.
Monetary Value: This is how much the windows are worth if you sold them to another party.
Replacement Value: This is the most up-to-date cost of recreating the windows using currently available materials.
Historic or Cultural Value comes into play when stained glass windows have historic and cultural significance.
Artistic/Decorative Value is very subjective. Sometimes it is obvious that a stained-glass window was created by an amazingly talented artist. On the other hand, some windows were poorly designed and executed by unknown craftsmen. For everything in between, it is a matter of opinion and taste.
Spiritual Value may be of utmost importance for stained glass windows installed in churches and other houses of worship. Stained glass windows can transform a building’s interior into an ethereal space conductive to prayer and reflection.