Unfortunately, if it needs septic and there isn't enough room for a leach field, you won't be able to build a home on it.

"expect my insurance goes up', 'hope the property value will increase', 'hoping for fewer problems', A business is not build on hopes and expecting.Build a budget, is the expected return more than your required return?

I want to build this niche to be one of my primary income generators.Already networked and known within local REI community.

Is it as simple as: "most houses in the area sell/appraise for X, figure out how to build a house for X-20%" and there's your 20% immediate equity in a new build? 

With that said, these are excellent products and ones that will be of great benefit in building your real estate portfolio. 

I couldn’t justify spending $50k on a roof of a building that’s only worth $65k.

I am looking for a company to build a log cabin modular in New York.

Would I be able to knock down and build a new home and once I sale, I use proceeds to pay off the first bank? 

I am going to build a house on it with cash and live in it.

The upside:  There is a lot of money to be made, potentially, and every door you add to your portfolio builds your company's value bigger and bigger (vs. sales, where it's a transaction and then it's over).