I'm trying to figure out how to analyse rehab costs and one of them is using private money.If I can buy a house for W amount of dollars, and it needs X amount of repairs, how much will a Y% private loan for repairs(Y) cost over Z amount of months? 

@Martin Z - You are absolutely right about loss in vacancy $$$.

If you are billing yourself my assumption is you give them a bill something like "the water bill for the property was $X and you used Y% therefore your monthly bill is Z?"

@Aaron Z..  

Hi @Marko Z. - great article!  

Consider Property X, Property Y, & Property Z - Ive done my analysis and all 3 fit within my investment criteria & terms, however each is slightly different:- all cash flow, but Property X has the best- all increase my net worth, but Property Y increases it the most- all have great COCR, but Property Z has the best If I had the funds to purchase all 3, I would, but I don't, so here is my question...which property do I choose?  

@Dani Z. you are a treasure!

Thanks @Dani Z.!

If you can't pick up the phone or text I would recommend hiring z professional to fill the unit for you.

I even had one thread or blog taking a spec builder from a to Z.