Stained glass windows

As a boy, I grew up in an area with very few stained glass windows. When my parents drove through London, as we did a number of times a year --- highway 401 was still to be carved through the southwestern Ontario farmland --- I always admired the many stained glass windows decorating homes in London.

It would be fun to do some research into stained glass windows. Were they expensive to install a hundred years ago? How many skilled craftspeople would have been involved in the creation of so many stained glass windows? Or did just a few artists work long hours decorating the older city homes?

This stained glass window is in an older home in the core. It's an area under constant threat of demolition to make way for apartment blocks or even parking lots.