Building Duplex as ADU in Grandmothers Backyard - Possible?

[Anthony Bertolino]

Hey everyone,

My grandma currently lives in Van Nuys, CA and is in need of additional cash flow.

Due to the recent law and due to the extra space in her backyard, I want to build a Duplex (2 2-1's) in order to help with this. She has the equity in the house in order to take a line of credit or re-fi in order to get the construction loan and in my mind, if legally possible, it's a no brainer.

I used a tool called "Cover" which was looking to market to me for their services, but it did reveal that I can build up to a 1200 unit in our backyard.

Hoping I can get some insight here as I am just starting to learn more about REI and this particular application is slightly more complex.

Thanks