Please be careful, at higher amounts leveraged, the carrying costs/time value of money can eat you alive if you have any hiccups in your project. 

So it's unreasonable to ask for a general price because any number that someone gives you site unseen is either: so low that the builder will eat the cost, lucky and spot on, so high the builder covers the worst case scenario but the investor would over pay if there are savings because certain things I mentioned above are applicable. 

Sounds like a case where you can have your cake and eat it too.

Not to mention if your house doesn't appreciate, you still pay 20% of the sales price which will eat up a chunk of the equity you've paid down.

You will need to pay the agent a commission, which can drastically eat into your cash proceeds on a flip.

So more vacancy + higher turn over costs quickly eats into the C and D returns, often yielding returns only marginally better than A or B assets.  

I’m Also certain you’re the type of landlord who will find every reason to eat up their deposit when they leave. 

(Oz Realty charges a one-month placement fee which does eat into returns over time.

For example, even if you are complying with their criteria, what if they have a road/ROW widening planned in 2 years that nobody knows about that eats up 30' into your property. 

One oh-$hit during rehab can eat into that very quickly.