[KarlCarrera]

JYL

Go the overhead route if at all possible.

Agreed, this price seems high if I understand what your trying to do. Shop around + surprisingly you can do alot of the work, check the codes and find a reasonable electrician to finish/help.

But your have something else to consider. Your service line feeding the panel was sized for that panel + at least one half. I'm guessing you have an alum. service line running to the house, #2 triplex if overhead or maybe 1/0 if underground. Adding this much additional load may cause voltage "drop" problems when everything is fired up.

See if your utility company will install a "recording meter" to help determine the actual max draw (load) that is existing. This will help you determine how much (if any) additional (service) work is necessary.

As an example my 150A panel is full, upgrading my panel is no problem, adding sub panels is no problem, but....loading my service cable (line) beyond allowable limits will only cause me voltage (drop) problems in the future. My service is UG and is 1/0 alum.

The additional load that your talking about may "undersize" your existing home service.

Just .02

Karl
88 Targa