What is a JADU and how did California just grant investors an extra ADU?

There are so many misconceptions about the definition of a JADU, the largest of which is that any ADU below 500 sf is a JADU. Knowing the definition of a JADU and how to use it for your investment strategy can unlock value for your project that even experienced investors don't realize.

A JADU is an additional ADU allowed by California on properties that have a permitted single family dwelling or a proposed single family dwelling.

• Is 500 sf or less and

• Is remodeled from permitted square footage of the existing single family dwelling or is attached to the proposed single family dwelling and

• Has an independent kitchen from the single family residence.

And here is where we get to the exiting part.  Until January 1st of 2026, the creation of a JADU required the owner of the property to live on the premises. With the passing of CA AB 1154 last October, this is no longer the case.  Home owners and investors can now have a detached ADU and a JADU on the same property without having to reside on the premises. This is a HUGE win for investors.

Please consult ADU Pros BEFORE starting your development project because different municipalities interpret the state code differently or are more generous than the mandate from the state. In regards to JADUs and ADUs, San Diego is more generous than the State and allows JADUs in more situations than the minimum that California requires, for example. Taking advantage of these differences can be the difference between a successful project and a loss.