Scale comes down to just a few items which I can tell you for free right here.1. 

Not factoring in these items in your analysis "hides" your actual return as these expenses will come up eventually.

Then you are "allowed" to spend the remaining $850 on mortgage and other items.For my Bookkeeping Clients, I suggest to them to use a Savings account for these items to add interest income to their account until they need it.

Hello BP Community,
I’m in the Phoenix metro area and am looking to acquire my first investment property to flip. To keep expenses down I would like to perform some of the cosmetic work myself. I’ve done several live...

We may have three or four different purchases (to keep the personal items separate from the individual business expenses.) 

Some common items to note: roof, electrical and plumbing, window updates.

They are one of the higher maintenance items and seem to only last a few years before being loud, wobbly or needing replacement. 

Do you know what the typical items banks consider in giving someone a loan or line of credit for their business are?

If it's a triplex and each unit needs the same work... then you need to multiply times 3 plus any exterior or shared items. 

I have a list of 12 items.