From Denvergov.orgPermits are required when your project includes the following: Alteration to the existing floor plan.Structural changes, such as adding or removing doors or windows.New or rerouted ductwork.New or relocated electrical or plumbing fixtures.NOTE: If your project changes the use or occupancy of your home or creates an additional dwelling unit without altering the exterior of the structure, see the project guide for adding a new dwelling unit. 

@Jim Blackburn I'm looking for a 203k Loan in Newark Nj area, would you be able to guide me in the right direction?

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/Wishing you the best!

Since  you are new I suggest you check out the Ultimate Free Beginners Guide under the education tab above. 

There are a number of guides that would apply.

Make sure to read the Beginner’s Guide: http://www.biggerpockets.com/real-estate-investing

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/Wishing you the best!

I am going to probably either act as the general contractor myself, or hire one part time to guide me through it. 

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It would be very rare that an agent could create a better business for himself by specializing  in representing investors.You would be best served by finding a top real estate agent to get you the best purchase terms but using a financial advisor to guide you with what you would benefit most from.