Wealthy owners are not leaving Sonoma County as a whole. They are leaving a specific kind of property: the large, hard-to-insure hillside estate and the attached luxury home. I pulled every Sonoma County sale over $3 million from the last 15 months, and the numbers show a top tier with far more sellers than buyers, while money keeps flowing into walkable towns and singular estates.
The costs of owning at the top keep stacking
Sonoma County voters have approved eight countywide special taxes, which add roughly 2% at the register and set a sales tax floor of about 9.25%.
Property tax runs about 1.15% of the purchase price in most of the county once local bonds are added. Buy a $4 million estate and you will pay somewhere in the mid-$40,000s every year.
Insurance hits hardest. Many standard carriers have pulled back from high-risk areas, which pushes owners onto the California FAIR Plan, and FAIR Plan rates are rising about 30% on average from this October. For a hillside property surrounded by brush, that bill can feel like a second property tax. I cover the bigger picture in my guide to the California home insurance crisis.
No one sells a wine country estate over one tax bill. But research from the California Policy Lab found that Sonoma County movers are about 25% more likely to leave California entirely than movers from other Bay Area counties, and Texas, Nevada, and Arizona draw the most.
What the $3 million-plus data shows
New $3 million-plus listings jumped 56% in the first half of 2026 (175) compared with the second half of 2025 (112). April brought 49 new luxury listings, the busiest month in the dataset. Over the same stretch, new listings between $1 million and $3 million rose a more modest 18%, from 752 to 890.
Buyers did not arrive in matching numbers. In February 2026, only 2 homes over $3 million sold across the county while roughly 80 sat on the market, and months of inventory spiked to 41.
Days on market rose from 49 in June 2025 to 241 in December 2025, about 8 months to sell. They have eased since, but still ran 108 to 111 days in July and August 2026.
Sellers paid to get out. In December 2025 and January 2026, $3 million-plus homes closed at 78% of their original asking price. On a $4 million listing, that is close to a $900,000 cut. Yet the median sale price held near $4 million throughout. Values did not collapse; speed and volume did.
Two luxury markets, not one
Homes from $1 million to $3 million had about 4.1 months of inventory, a balanced market, and sold in about 72 days on average. Sellers closed at 94% of original list price, with a worst month of 88%.
Homes over $3 million had 16.6 months of inventory and averaged 113 days on market.
Sales volume tells the same story. Homes from $1 million to $3 million closed about 1,435 sales over 15 months, roughly 96 a month, against 400 to 480 active listings. Homes over $3 million closed 143, about 10 a month, against 130 to 180 active listings. Only about 7% of the luxury inventory sold in a typical month, compared with roughly 25% in the tier below.
The speed gap has held, too. Over the most recent three months, $1 million to $3 million homes sold in 63 days on average, while $3 million-plus homes took 97.
On price, sellers under $3 million held firm, closing at 94% of original list on average. Above $3 million, the average was 90%, with a low of 78% in December 2025 and January 2026.
So the top tier has far fewer homes for sale, yet they sell at a fraction of the pace. My breakdown of the Sonoma County housing market by price point goes deeper on how each tier is moving.
Where wealthy buyers are going instead
Ultra-wealthy buyers are still here. The Summit, an estate of more than 1,000 acres on Sonoma Mountain, sold in late August for $38.5 million, a county record. The seller had bought the land for about $12 million and reportedly put more than $30 million into it, so even the record sale was a wealthy owner exiting.
Below that level, buyers are moving toward ease. Downtown Healdsburg is the clearest example: homes near the Plaza start in the low-to-mid $1 million range, with standout properties well into the $2 millions. A smaller in-town lot is easier to insure and simpler to lock up as a second home. For buyers who want privacy, Dry Creek Valley sits 10 to 15 minutes from the Plaza, with the wells, septic, and fire prep that come with rural living. You can see which neighborhoods draw this money in my guide to where the wealthy live in Sonoma County.
What sellers and buyers should do now
If you are selling above $3 million, price to fresh comps from your micro-area, acreage, and property type, and plan for a 60 to 120-day runway with staged price changes rather than one big cut. Market directly to Bay Area buyers, and have your well, septic, defensible space, and insurance quote ready before you list.
If you are buying, the $3 million-plus tier is the most negotiable part of the market. With mortgage rates back above 7% in late September, a cash or large-down-payment offer with no financing contingency carries real weight with a seller who has sat through a season.
I walk through all of this in the new video, Why the Wealthy Are Leaving These Sonoma County Areas.
Thinking about selling or buying above $3 million in Sonoma County? Email me directly at david@bruingtonhargreaves.com and I'll pull the numbers for your pocket of the county.
About the author
David Hargreaves is the co-founder of BruingtonHargreaves, one of Sonoma County's top-ranked real estate teams and part of W Real Estate. Originally from the UK and an Oxford University graduate, David built and ran a digital marketing agency serving Google, Facebook, and other major brands before becoming one of Sonoma County's top agents within three years of entering real estate.
Today he and business partner Jonathan Bruington have sold more than $250 million in Sonoma County homes over the past three years, earning recognition as a RealTrends No. 2 team in the county and the No. 1 team in Healdsburg. David specialises in helping Bay Area buyers and sellers with luxury properties and vacation rentals across Healdsburg, Windsor, Santa Rosa, and the Russian River communities.
He lives in Sonoma County with his wife Nancy and is happiest cycling the back roads, exploring local wineries, or behind a camera. Have a question about buying, selling, or building in Wine Country? Book a free call.