Gas in historic buildings demands care, because you frequently find piping installed under standards that predate the current code by generations.
Abandoned lines in old walls
Peninsula renovations routinely uncover disused gas piping from earlier eras, sometimes still connected. Capping and removing it correctly is the part of a renovation nobody sees and everyone should insist on.
Undersized for modern appliances
A house piped for a stove will not carry a tankless heater and a modern range. Adding load to an old line produces performance problems that get blamed on the appliance. We calculate before running.
Suspected leak
Leave the building and call the utility from outside. Do not operate switches. On party-wall properties, tell your neighbour as well — shared construction means a leak is not always confined to one address.
Permitted and tested
Every gas job pressure tested and inspected. There is no version of this work where that is optional.