It must include permanent provisions for living, sleeping, eating, cooking, and sanitation.
Detached: A stand-alone structure (often in the backyard). Attached: Built as an addition to the primary residence. Conversion: Transforming existing space, such as a detached garage or a basement, into a living suite.
Generally, allows for up to 1,200 square feet, depending on local jurisdiction and lot size.
Limited to a maximum of 500 square feet.
Requires an "efficiency kitchen" (sink, appliances, and counter space), but does not necessarily require the heavy venting of a full-scale kitchen.
A JADU may include its own bathroom or may share sanitation facilities with the primary residence.
Unlike standard ADUs, California law often requires the owner to reside in either the JADU or the primary unit (though laws continue to evolve; check local mandates).
For the sophisticated investor, the current California "Triple Play" strategy is the pinnacle of property optimization. Under specific conditions, homeowners can now add both one full ADU and one JADU to a single-family lot.
The Result:
A single-family property effectively becomes a triplex, tripling your potential rental streams while maintaining the tax benefits and financing options of a residential property.
Navigating the differences between an ADU and a JADU requires a deep understanding of:
Title 24 Energy Standards: Meeting California's rigorous green building codes.
Setback Requirements: Navigating the 4-foot side and rear yard mandates.
Utility Metering: Deciding between sub-metering or shared utilities based on long-term ROI.
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