I did something similar but more major (i.e. move a wall a few feet to increase a room's size)
My job required a city permit and to get approval I had to get an engineer to provide a certificate/letter showing that the reno was not going to cause structural issues ($500ish a few years ago) After I got this, i used that engineer letter and the Reno drawing to get the permit from the city.
Sometimes the contractor might do this for you but they will charge you a premium.
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