Hello BP Community,I wanted to reach out and get opinions from local flippers/rehabbers who have done accessory unit additions in orange county california.I have gotten quotes ranging from 150-200/sqft to almost 250/sq to build a new accessory unit and I am trying to dial in a better estimate to figure out what the cost/benefit might be and if this might be a deal. 

In San Jose and per codes I’m allowed to build an accessory Dwelling unit in my backyard.

You may have to get creative...find a duplex in a good area and Airbnb the units or find an SFR with a legal accessory dwelling unit and live in the smaller unit while renting out the main etc. 

But don't add a stove and don't get it permitted as an in-law/ADU (Accessory Dwelling Unit).

Or ideally a home that has a legal “Ohana” (family) house or permitted ADU( Accessory Dwelling Unit).

Its zoned as a single family home and has everything necessary to be a legal accessory as far as the city goes, but there are a few problems with the HOA.This is what the HOA has to say about renting out part of the home. 

Another item to consider in your plan is often times the utilities are not going to be separate, which may not be an issue when you live there but if you end up renting out your dwelling when you PCS elsewhere, your new tenant is not going to pay for their utilities plus the accessory dwelling unit.

If the accessory dwelling unit (ADU) was constructed in a workmanlike manner you should get the necessary permits. 

The "accessory short term rental" code variances are for residential zones. 

I bet you could get cash flow if you bought a large lot single family and built a separate "accessory unit" cottage in the back yard or converted the garage to a rental.