From Marks post:
Benefits of ADUs ADUs provide a wide range of benefits, including:
• ADUs are an affordable type of home to construct in California because they do not require paying for land, major new infrastructure, structured parking, or elevators.
• ADUs can provide a source of income for homeowners.
• ADUs are often built with cost-effective wood frame construction, which is significantly less costly than homes in new multifamily infill buildings.
• ADUs allow extended families to be near one another while maintaining privacy.
• ADUs can provide as much living space as many newly built apartments and condominiums, and they’re suited well for individuals, couples, small families, friends, young people, and older adults.
• ADUs give homeowners the flexibility to share independent living areas with family members and others, allowing older adults to age in place
Didn't see the disadvantages listed?
Like more cars parked on narrow residential streets
Fire protection, getting a firetruck to the scene due to street parking
Landlords telling ADU occupants where they can park and not park.
Mail delivery and address confusion
Fence issues
Sheds being turned into ADU's on the same lot as the Garage ADU not meeting room size and light requirements
Utility issues like sewer, water and electric, (sewer capacity is typically designed for the intended use, residential subdivision, could cause a treatment plant to be at over capacity and require expansion).
Are they required to have solar, per CA mandate?
Insurance, can they be insured?
Rentals, is this allowed?