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Castlerock

NeighborhoodThe kind of area this report covers. Neighborhood areas nest inside each other, from broad districts down to small pockets.California
$1.5M
Median sale priceThe middle sale price each month, counting normal open-market sales. The average runs above the median when a few expensive sales pull it up. Bars show how many homes sold.
4
Sales (12 mo)How many homes sold here in the last 12 months. More sales make the other numbers more reliable.
$1.3M
Median valueThe middle estimated value of all homes here, not just the ones that recently sold.

Deed records through Apr 2026 · Quarterly intervals (lower sales volume)Counties take time to publish deeds, so the newest months can be incomplete and may shift as more records arrive.

Market Trends

Sale pricesThe middle sale price each month, counting normal open-market sales. The average runs above the median when a few expensive sales pull it up. Bars show how many homes sold.MedianSales
20162018201920202021202320242026
Growth (year over year)How much prices and sales counts changed since the same time last year, using a 3-month average to smooth out noise. Above the dashed line means growth.PriceSales
20162018201920202021202320242026
Price per square footThe middle price per square foot, for sales where the size is known. It adjusts for homes being different sizes.$/ft²
20162018201920202021202320242026
Sale premium vs estimated valueHow sale prices compare with our estimated values at the time of sale. Above the dashed line, homes sold for more than the models expected — a sign of competitive bidding. Below it, buyers paid under model value.Premium
20162018201920202021202320242026
Annual turnover (share of homes sold)The share of all homes here that sold in the trailing 12 months. Higher turnover means a more liquid market where homes trade hands more often.Turnover
20162018201920202021202320242026
Buyer mixWho is buying. Cash means no mortgage was recorded, investor means the buyer looked like an investor, and flip means the home resold within a year.CashInvestorFlip resale
20162018201920202021202320242026
Financing (share of purchase price)For buyers who borrowed: the middle share of the price they financed, and the middle share they paid up front.Loan (LTV)Down payment
20162018201920202021202320242026
Sellers who sold at a gainThe share of sellers each month who sold for more than they originally paid.Sold at gain
20162018201920202021202320242026
Typical hold before sellingThe middle number of years sellers owned their home before selling.Median hold
20162018201920202021202320242026
Median annualized return at resaleThe middle yearly gain sellers earned, spread across the years they owned the home. Only counts homes held at least a year.Annualized gain
20162018201920202021202320242026

Housing Stock

HomesHow many homes we have records for in this area.139
Median value (AVM)The middle estimated value of all homes here, not just the ones that recently sold.$1.3M
Median sizeThe middle home size here, measured in square feet.2,909 ft²
Median bedroomsThe middle bedroom count for homes here.4
Median year builtThe middle build year for homes here. A recent year means most housing is newer.1987
Single familyThe share of homes here that are single-family houses.98%

Equity & Ownership

Equity rich (LTV ≤ 50%)The share of owners who owe half or less of what their home is worth, meaning they hold a lot of equity.56%
Underwater (LTV ≥ 125%)The share of owners who owe at least 25% more than their home is worth.2.2%
Owner occupiedThe share of homes lived in by their owner rather than rented out or left empty.94%
Company ownedThe share of homes owned by a company or trust instead of a person.50%
Median loan-to-valueThe middle share of home value still owed on loans across all owners here.43%
Typical ownership tenureHow long the typical owner here has held their home.16.5 yrs

CommunityThese are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.17
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.549

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.99%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.6%
PopulationHow many people live in this area.180
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.975 / mi²
Median household incomeThe middle household income here — half of households earn more, half earn less.$131K
Average household incomeThe average household income. It runs higher than the median when a few high earners pull it up.$128K
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.34 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Market metrics are derived from recorded arms-length deeds and refreshed nightly. Temperature blends price momentum, sales velocity, turnover and resale outcomes, ranked against all neighborhoods nationally.

How Castlerock compares

By median home value, Castlerock is the 3rd most expensive of 46 neighborhoods in Sonoma County, and its typical home is worth more than 86% of all homes in Sonoma County.

Home values in Castlerock

Share of homes at each estimated value.

Median
$661K$2.2M
neighborhoods in Sonoma County ranked by median home value
#Sonoma CountyMedian valueHomes
1Diamond A Ranch Estates$1.9M268
2Riebli-Wallace$1.6M230
3Castlerock$1.3M139
4Fountaingrove$1.2M1,996
5Skyhawk$1.2M620
6Gold Ridge$1.2M178
7Canon Manor$1.1M279
8Kenwood$1.1M447
9Western$1M3,924
10Bennett Valley$1M630
11Oakhill Brewster$999K1,516
12Scenic Brush Creek$935K136
13Hidden Valley$911K337
14Downtown Petaluma$907K545
15Waterfront$906K284
16Proctor Terrace$887K731
17Fulton$853K135
18Graton$833K576
19Larkfield-Wikiup$829K2,560
20Santa Rosa Farms$824K392
21St. Francis Acres$822K711
22College$813K4,901
23Country Club Estates$798K1,065
24Adobe$770K6,219

46 neighborhoods in Sonoma County are ranked; the most valuable are listed here.

About the Castlerock market

What is the median home price in Castlerock, CA?

The median sale price in Castlerock, CA is $1,500,000 (data through April 2026), based on deeds recorded with the county.

How many homes sell in Castlerock, CA each year?

4 homes sold in Castlerock, CA over the last 12 months (data through April 2026). TopHap counts recorded arm's-length deeds, not listings, so the figure is not affected by which brokerage handled the sale.

How many homes are there in Castlerock, CA?

Castlerock, CA contains 139 residential properties, with a median of 2,909 square feet, 4 bedrooms, built around 1987. The median TopHap Estimate is $1.3M.

How does Castlerock, CA compare to the rest of Sonoma County?

By median home value, Castlerock, CA is the 3rd most expensive of 46 neighborhoods in Sonoma County. Its typical home is worth more than 86% of all homes in Sonoma County. Riebli-Wallace ranks just above it and Fountaingrove just below. The ranking is rebuilt nightly from the county assessor record of every home in each area.

Do people own or rent in Castlerock, CA?

94% of homes in Castlerock, CA are owner-occupied. 50% are held by a company rather than an individual.

How much equity do owners in Castlerock, CA hold?

56% of mortgaged homes in Castlerock, CA are equity-rich, meaning the loan balance is under half the home's value. 2.2% owe more than the home is worth.

Nearby markets

Browse addresses

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Explore Castlerock on the map

See every recorded sale, price heat map, school zone and flood overlay across Castlerock in TopHap’s interactive 3D map.

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A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map