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Depends heavily on how hard it is to get through the wall.

Also adding a new circuit to a panel is different than extending one from inside

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Just stacco on wood frame. It’s adding a new circuit from the panel; might need to add a circuit breaker for the circuit. The wire can go through crawl space or over in attic.
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I'm in ship construction (industrial)
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For one exterior GFCI receptacle in a bell box with a weatherproof in-use cover and one GFCI receptacle in a plastic box with 50’ of 14/2 NM-B cable, I would charge you $650.

I don’t do the work myself.

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If you run the wire yourself would only be a couple hours of labor
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Insurances love this trick so much they will refuse to pay anything in case it even indirectly caused any event. At least get it verified by professional, lowering financial gain of such approach a bit
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$80-140/hr, depending on market (residential electrical work).
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