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Blacksmithing in Residential Neighbourhood
(slrpnk.net)
I think this article will help
https://www.anvilfire.com/21st-century-blacksmithing/getting-started/blacksmithing-law/
No real advice but the smoke from the coal was my main concern when I was trying to do it in my backyard. Your local laws will be what you need to look at, but sound is not going to be your main issue imo.
This is the initial creation of the Blacksmithing community in the Lemmy environment.