Person that has no construction background decided to buy an acre and build a home on it.  His participation involved finding subcontractors for the plans, pretty much.  Once the house was built, he hired a realtor and sold it.  Made some profit then decided to do it again.  So in 2018 he has two homes that he built and then sold.  If he will continues to do this it's obvious that he will need to open a company, but if he only did it that two times I'm a little confused.  He said that in '19 he did not buy any land or anything to build on and he does not know if he will.

Any good advice?

Thanks