Need estimate expectation guidance

[Thomas Brown]

New investor here and I’m looking to pull the trigger on a flip however I’m having a hard time picking the right amount to spend on a purchase and rehab because I don’t have an idea of what a full gut should cost. 

Market: Philly- surrounding job suburbs

Typical sq footage: 1000

Rehab quality- class B

I have been told to expect to spend about 100k for a full gut on a property that’s about 2000 sq ft. Not saying this info is wrong just looking for additional guidance and advice. 

And also does this mean a 1000 square ft home should be half?