When someone calls me or brings in a broken piece of stained glass art, I first take a look at it- just an overall evaluation of the piece. Next I mark each broken piece with a sharpie with a number, this way I know how many broken pieces there are and they are marked so I do not have to look for them again. Then I figure out what kind of glass it is- true antique or present glass (1970's to today). Do I have the glass? Can I get replacement glass? Is it lead work or copperfoil? How hard is it to get to and replace the broken pieces? Does the whole piece need to be taken apart to to repair it?
I know that there were way too many questions in that paragraph. It takes some detective work to figure out the process from start to finish and I just wanted to give you a peek behind the process.
As a base line I charge $50 for the first piece and $25 for each addition piece. The amount of damage also may make the piece not repairable, both glass wise and financially. It is hard when someone comes in with a piece their parent made or that has been in the family forever and they want it repaired and when they hear the cost they are devastated again.
I have had people sign up for a stained glass class so they could learn to do stained glass and try their hand at repairing the piece themselves.
If you do have a stained glass art piece that needs repair please email me at firstname.lastname@example.org or call me at 703-623-0905 for a complimentary estimate of repair.