Which will also depend on the neighborhood.You want to, "rehab/maintain to the Neighborhood".Most investors go overboard on their first rehab and waste a decent amount of money.

HEY GUYS JUST WANTED TO KNOW IS IT POSSIBLE TO GET FUNDING FOR A LIVE IN FLIP IM CURRENTLY ONE SIDE AND WOULD LOVE TO REHAB THE WHOLE PROPERTY I GOT IN USING FHA !

Quote from @Ben Trageser: Highly recommend Maven Cost Seg!

To save those costs, you might want to stick to some year build and older, for example, if you cannot do inspections on the properties that you are buying due to off-market deals or something else that is hindering you (all sellers I buy from do not want anyone in the home till we close).

I know a cost segregation study would be too expensive for such a small amount of property, but is it permissible for me to estimate the value of the components on my own?

However, I still struggle to understand the art of estimating rehab costs. 

@Jake Baker  You should think about a rehab loan if you are going to buy and hold.

I'm new to the 203k Rehab loan.

Hi John, When you say rehabbing land, I am assuming you mean re-zoning and selling the vision to an investor or buying land and subdividing it?

Here's an article with things to consider when selecting a cost segregation company.