New law allows granny flats in California dwelling units, commonly known as granny flats, have become legal in California. Many people are opting to add these units to existing properties rather than move to a larger home. ■ By Matt McPherson / Columnist More and more homeowners are opting to construct room additions or accessory dwelling units (ADUs) – more commonly known as granny flats – rather than move into a larger home. And in an attempt to alleviate the housing shortage, more municipalities are granting permits for these secondary structures. Up until recently numerous forms of guest houses were deemed illegal in California. At the beginning of 2017 a new law took effect that made it

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