California's family compound market is anchored by the wine country counties (Napa, Sonoma, Mendocino) and the Sierra Nevada foothills - two very different landscapes with very different price points.
Napa and Sonoma wine country compounds typically combine a main estate house with guest cottages, vineyard operations, and resort-quality amenities on 5 -50 acres. These are among the most expensive compound properties in the country, with the finest estates regularly exceeding $10M -$20M. The combination of wine production income, culinary culture, and Bay Area proximity justifies these prices for the right buyer.
The Sierra foothills (El Dorado, Amador, Calaveras, Tuolumne counties) offer a dramatically more accessible entry point - genuine ranch and farm compounds on 20 -100 acres at $1M -$4M. The Gold Rush country character, craft wineries, and proximity to Sacramento and the Bay Area make this an underappreciated compound market.
California's regulatory environment for multiple dwellings has improved significantly since 2020 ADU reform legislation. State law now preempts many local restrictions on ADUs, making it easier to add secondary dwellings than in previous decades. California's high income tax (13.3% top rate) is a meaningful consideration; many buyers elect Nevada or other low-tax state residence while maintaining a California compound.