I know we’ve been discussing this elsewhere, but here is my “two-cents.”
Load calculations are generally done during the design phase of the construction/renovation/addition(s) of a residence, to determine the necessary service capacity, and the size and quantity of branch circuits that will be necessary.
I found it interesting that Juan had to start another thread just to accept the opinion already offered in the other thread, without waiting for benefit of further input from others.
Normally, as Jeff has stated, it is done at the design phase before construction is begun. This is typical of both new construction and renovation projects.
Sometimes it’s good to start another thread just to get your question separated from all the useless and unrelated-to-the-topic posts.(Like my post in this thread for example)
I only did load calculations when in the back up generator industry. Why would a Home Inspector ever need to do a load calculation anyway, except for the obvious.
I inspected a 1500 sq ft home not long ago, where the old fuse box had obviously been replaced by a breaker box. It contained 5 total circuits. No calculation necessary…