Quote:
Under the ADU law, the process to obtain approval for an ADU has been simplified. The ADU law requires subject jurisdictions to allow one ADU as an accessory use to a single-unit detached dwelling unit, subject only to an administrative approval process, in any part of the subject jurisdiction that allows single-unit detached dwellings.38 The administrative approval process may not require a public hearing, recommendation, or decision by an elected or appointed public body or a hearing officer.39 Previously, if an ADU was not permitted by the applicable zoning regulations, owners had to have their property rezoned to permit an ADU through a lengthy process that may or may not have resulted in an approval for an ADU.
Additionally, the ADU law requires that subject jurisdictions have objective standards for the approval process. Objective standards for the approval process are defined in the ADU law as those that (1) allow for consistent compliance determinations regardless of the decision maker; and (2) do not require a subjective determination,40 including, without limitation, that an ADU application be consistent with master plans or other development plans, that the ADU be compatible with the land use or development of the surrounding area, or that the ADU be consistent with the ?public welfare, community character, or neighborhood character.?41
From my memory, ADU is capped to half the square footage of the primary residence, and you only get one. So if your primary residence is 3,000 SF, ADU can be no larger than 1,500, still has to be permitted (or otherwise approved through the administrative process), the regulation just makes it "shall issue". I don't believe those limits have changed. 
