I have a foyer light that works from 3 different light switches. One of the light switches I never use to turn on the foyer light, is there a way I could use this switch to power a new sconce (wall) light? Or do I have to get direct power from an electric outlet and then run it to a new light switch?
An electrician could eliminate the extra switch and rewire that switch box with a new hot to run your sconce, but I'd leave it to a professional.
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That arrangement controls the light from 3 different places and no, you cannot do that. You're other assumption is the correct method.
In order to add a light from that switch location would either require the presence of the circuit power feed (hot and neutral) at that location if you want a separately controlled light or the common switch leg (switch leg to foyer light and neutral) if you want the light to be controlled with the foyer light. Considering that you have three switches controlling a foyer light, I would assume that you have a split level entry. If that is the case, you cannot legally re-purpose the existing light switch for a different function since code requires that lights in a stairway be controlled by all points of entry into the stairway. To meet code, the sconce light would either need to be controlled by a completely separate switch (which could be installed at the same location as the existing switch depending on configuration) or be controlled with the foyer light.
