Well besides the hard costs (construction, materials) and soft costs (permitting, architecture, fees, engineering) people often forget holding costs. 

However, I strongly suggest to seek a structure engineer or architect/drafter that guide/help you on planning and dealing with zoning permits as well.

I'm a software engineer for a company called Accenture but I dabbled in underwriting multifamily on the side.

It's also important that you have a good civil engineer.

I lead every stage of the development from the rezoning of the property, handling all the communication with architects and engineers.

The study identifies with forensic engineering detail the immediate Bonus Depreciation 5, 7 and 15-year personal property class lives qualifying portions of a building that are normally buried in 27.5 year residential or 39 year commercial categories.

I like to use data, coming from an engineering background, and I see the data and trends over history, this can be used as a guide only to help with investment decisions (it’s not a guarantee but another tool to use). 

I'm an engineer by degree so a methodological, data driven approach was important to me.  

Now in most cases the same renovation will require an engineer report, and full architectural drawings….I recently had to obtain structural drawings and complete special inspections for a rear trex deck….Just a few examples of costs someone will incur flipping a house in Philly.

Quote from @Michael Torku: I'm a software engineer getting into the world of real estate investing.