Most local banks and credit unions will have free accounts.You need two accounts: checking and savings. 

Attend local builder associations or networking events, and focus on small contractors or businesses without in-house permit expertise.Highlight how you save time and ensure compliance—it’s a big value-add.

They can make or save a lot of headaches for you.

Most larger communities will have a Homebuilders Association, i would start networking to find a builder that can finance the construction. 

Quote from @Steven Diaz: Hello,Was going to start construction on a two story 3bd 3.5ba 1500sqft primary home and a 2bd 2.5ba 800sqft ADU.  

Remember to save some money for capital repairs.

The promise of accelerated depreciation and immediate tax savings is attractive.

Let me start by saying that they are both great shows and I think Dave Meyer is great, as are the other present and past guests of both shows. 

This would help save me some money to use on the house that is getting renovated and I wouldn't have any money out of my pocket up front for the duplex except when the mortgage starts.

Excellent start.