I chose to do the site prep myself...it would have been $5-6K to have someone else do it, so other than my time, fuel for the Big Orange Power Tool and the cost of my Stabila rotary laser, I managed the job for about $3K. I'll also do all the interior finishes, HVAC, etc., as well as all the electrical beyond the basic service. Building the actual structure...not something I'd be up for which is why I hired the company to do it rather than buying a "kit".
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The most expensive tool is the one you buy "cheaply" and often...