What the City Does Want a Permit For
More than people assume. Residential mechanical work covers furnaces and air conditioning. Re-roofing needs one, and so do replacement windows and doors, finishing a basement, sun decks, retaining walls, sheds, fences, swimming pools and hot tubs. The city publishes its inspection sequences and even a guide to why inspections fail.
Most of that work has been done at some point on a house of this age. Whether it went through the city is the question a buyer's inspector, an appraiser or a title search eventually raises, usually with a contract already signed.