Originally the bylaw was intended to control landowners / contractors who would tear down an old house and remove an established tree, due to the hot real estate market , the cities found that too many valuable trees were lost in the quest for profit, generally homeowners here are more responsible as they know the value to their property. Still a contractor can still apply to have x amount of trees destroyed yet must replace such with a similar species of certain trunk caliper. A good move but no protection for established trees in need of maintenance and who are susceptible to Mr. Hackemoff & son.