Build an accessory dwelling unit (ADU): An ADU is a smaller, self-contained dwelling unit that can be built on the same lot as an existing home or duplex.

Look under "accessory units" on this link https://selling-guide.fanniema...  

Hi there - I bought a SFH in Oceanside (1700 sq feet on a ~7000 sq ft lot) recently and am planning to build an attached JADU (garage conversion + possible extension) & then later an attached or detached, larger ADU (accessory dwelling unit / granny flat / casita) in the backyard.

@Carlos CarbajalAccording to that link, “Existing law defines the term “accessory dwelling unit” for these purposes to mean an attached or a detached residential dwelling unit which provides complete independent living facilities for one or more persons.”But what if it’s missing a kitchen.

You can make great returns on a house hack, maybe even pairing your residence with a cool STR if you find a single family with accessory in the Catskills or Hudson Valley.

@Alex Chau what you are considering building is called an accessory dwelling unit (ADU) or often times called an in-law unit or granny flat. 

My goal was to have something for guests to play music on, while also giving me a hub to automate our smart accessories like doorbell, lock, and exterior cameras.

Hello all, I'm a contractor looking at land for sale, and I found one where I can build a SFR house 4 beds/3 bath and an Accessory Dwelling Unit in the back. 

Then I don't worry about it being a legal accessory apartment or formal duplex.Some cities are brutal and you just stay out of them.Heck, I have 2 houses on the same street because I know the sub set within the neighborhood haha

But this is what happened.The OP posted up the specialized code for Accessory Dwelling Units in his area that he had obviously never looked at, which contained answers to some of his basic questions, in reference to the International Residential Code, which he had also obviously never looked at.