Backyard cottages (DADU's) require one parking space in addition to any other parking space required for the primary residence. These parking spaces can be provided in tandem. However, these spaces cannot be located in the required front setback.
a blog about small house design and living
Increasing environmental awareness along with economic and demographic trends favor smaller house sizes. Many cities are doing their part by updating zoning codes to allow cottage housing and small secondary houses (ADU's) on residentially zoned lots.