Depending on the amount of money you are interested refinancing, you may not get as much as you want. 

My price starts at $325 for that size home but depending on when it was built it might be slightly higher.  

Depends on access.....likely will need a tow behind concrete pump to get it in place.

@Tavares Lumpkin  All depend  how you want to use your funds. 

@Ross Sib Construction costs vary wildly depending on many factors like which part of the country you are, the type of materials used, etc.

In 1980 I graduated college with honors with a business degree that emphasized real estate.The first thing I would say about your questions is to not depend on any book on construction costs. 

Depends on the lender.

We look to rehab all of our properties based on what the local market can support and then hold the property (passive income) or sell the property (generate capital) depending on how we think the property fits in our portfolio best. 

@Joshua Horn that will depend on how your contract is worded.

I guess it depends on what your goals are?