Where I live a building permit for a new house will cost you 50 dollars. That will get you started but you will also need a septic system plan which is another 300 bucks, (by a licensed soil engineer) and then a plumbing permit which is 20 dollars outright, and four dollars for every fixture in the house. There is no need for any electrical permits, driveway permits or any of that other stuff I see on This Old House of Home Again.
Surprisingly, the biggest cost of getting a home underway here is getting electricity hooked up. When a new meter is installed, the power company here charges a whopping 1000 bucks. I guess they want to make sure that anyone that has power hooked up is serious about it.
As far as material costs, ½ the cost is material and labor here. When I speced out my new addition, a 28 by 40 foot ranch addition with concrete slab, the turn key price...that being I do nothing but cut a check to the contractor, was 79,000 dollars. I decided to do the majority of the work myself. In the end I had some subcontractor work done that amounted to 10,000 dollars. The materials cost was 35,000 dollars for a total cost of 45,000 dollars. That is about as close to ½ as you can get I think.
One word of caution though. You may have plenty of friends NOW, but after you pour the concrete, you will have very few friends! Its just a given. My Dad and brother helped me one weekend out of the 7 months it took to build my addition. I can honestly say, that other than pouring the concrete, and doing the drywall mudding, I did everything else. I'm just saying, when you are building something, don't count on your friends too much. They have a strange way of not being around when you can really use them.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"