I'm curious if anyone has used generic plans from sites like Houseplans.com to start their ADU build?

Then, after that convo, simply partner up with someone who can supplement the areas you're lacking. 

Landlords that ***** foot around with rent increases are simply wasting time and unnecessarily supplementing their tenants rents.

I am also getting my real estate license to help supplement our income and to help with our investment goals.

If you're trying to supplement your current income and get funds immediately, it's not the best strategy.

Once you start supplementing income with rental income your tax returns get messy for some lenders and they dont want to spend the time needed to make a deal work. 

I also add an overall fudge factor of 10% to the bottom of the sheet.I've thought about making my spreadsheet more generic such that I could enter material only prices and installed prices and have another if/then statement for whether I pay for installation or do it myself and I probably will down the road so that I can calculate savings easily for doing things myself vs hiring it out.When I go look at a property, I estimate the square footage of each room.  

There are some great replies in here already but I would also want to suggest the use of virtual management software as a supplement to traditional management as well.There are some powerful software tools out there that essential manage all of those units from your computer screen (collect rent, process maintenance tickets).

Can I do an umbrella policy without doing a traditional policy or are they supplemental policies?

Here you're hoping for appreciation and the fact that you've put such a large down payment on the property the majority of the rent is actually going towards the principal versus interest.IMO there's pros and cons to both strategies... one is very effective if you wish to build wealth and a passive income, the other is a good strategy to have if you already HAVE wealth and want to supplement it with a passive income.