First, the three prong outlets… how many total? I’ll assume that you have a total of 8…. this will be one 20A circuit. You will need 1 breaker approx. 60′ of 12-3 romex and the outlets themselves. Approx 3 hours total labor, with a cost of $195 for labor and approx $90 in material. The outlet with reversed polarity and the weatherproof cover approx. .5 hours labor and a material cost of $8. The total project cost of approx $325 + taxes. This cost is assuming these outlets are not in the bedrooms, bathrooms, kitchen, or garage area which will require a GFI or AFI breaker/receptacle, which would raise your cost around $30 for a GFI and about $75 for an AFI. Hope this helps.

The reverse polarity one requires that you swap the black and white wires. The black wire should be on the copper colored terminal and the white is on the silver colored contact.

The weatherproof cover shouldn’t be too much, you will also want to get a GFIC receptacle when you replace the cover.

The three bedrooms should have arc fault circuit breakers installed, and GFIC receptacles installed in the bathrooms and kitchen, garage, basement, and outside outlets.

By the time you are done, I would think around 1000 bucks counting everything with parts.

here in NY its about 50 or 60 dollars per outlet to run new “Romex” from outlet to breaker box , thats for first floor rooms and goes up from there for upper level rooms
and thats not including “parts”

weatherproof cover is really something you can do yourself they are very easily installed

the outlet with reverse polarity will also proabably need new wire run to make it a grounded outlet , unless it is already then it is wired wrong and will need to be hooked up properly which shouldnt cost much

B.

The reversed polarity and weatherproof cover are very easy. There is no need to run cable to the ungrounded outlets unless you want to, just replace the outlets with GFI outlets. Yes the GFI outlets ungrounded meet code for exisitig wiring. The cost is about $5 for the cover, $12 for each GFI, and about 2 hours labor, say $80.