Like to explore the following scenarios to find out their relative costs,

1) Brand new completed house
2) Buy a section ourselves, and builder to build.
3) Buy a section through property agencies, and builder to build
4) Builder to buy section and build

Which is the cheapest option? Pros and cons?

I noticed that the brand new houses are going for a very high value above RV. That was what made me wonder maybe if we were to buy a section ourselves and build, it would have come up to that RV value anyway. So that extra amount on top of the RV was to cover for the "efforts" the sellers took to bring the house to completion? If this deduction is correct, and if we are not in a hurry to move, wouldn't it be cheaper for us to buy a section and build ourselves?