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  • Writer's pictureViranchi,

Attached ADUs & detached ADU conversions- why do they NOT require solar? Why complied as Additions?

Updated: Feb 7, 2022

Similar Question: Why is the detached ADU shown as an Addition on the Title 24 when both are not attached physically?

Similar Question: Why is the floor area of the main home mentioned on the Title 24 report when this is a detached garage conversion to ADU?

Similar Question: How come we don't require solar on a detached garage conversion to ADU or an Attached ADU?

Per the Title 24 energy code and bulletin Issue 122 January - March 2018 of the California Energy commission, all detached ADU conversions (Garage, Pool House, Storage room or any such previously unconditioned spaces that are converted to an ADU) and attached ADUs are to be modelled and complied as Additions to the main residence on the lot. This allows compliance with more lenient specifications and hence is beneficial to the homeowner from a cost save perspective. Further, any Additions (unlike New Constructions) or Alterations do not trigger the solar power requirements of the Title 24 energy code. Thus these ADUs do not require solar.

This is why we have taken the ADU as an Addition to the main home with the floor areas of the ADU and the main residence both modelled into the compliance calculations. Please also see attached the above referenced blue print along with the concerned area highlighted in yellow.

CEC-400-2018-007 - Is my ADU an Addition or New Construction
Download PDF • 451KB

Further Reading: What are some of the other requirements concerning ADUs from a Title 24 energy code perspective?

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