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$8,200,000

  • For Sale
  • Active
  • Single Family
  • 5 Beds
  • 4 Full Baths
  • 2 Partial Baths
  • 5,736 Sq. Ft.
  • 4 Car Garage
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The minute you arrive at this property you're immediately immersed in the peaceful, natural surroundings. The main house boasts spacious bedrooms with ensuite bathrooms, a tranquil primary suite, and an open living area with a four way fireplace. The kitchen features an island with a live edge walnut top, premium appliances and a walk-in pantry. A separate guest housesits above the four car garage and has a treehouse feel as you take in the gorgeous surroundings from the wraparound balcony. A rare find is the in-ground wine cellar. This space can hold an impressive collection of wine and features native rock from around the property. The outdoor entertaining areas are spectacular with an expansive stone patio overlooking the pond complete with a lighted fountain and floating islands. The gardens and landscaping are truly breathtaking with an incredible variety of plants, flowers, fruit and citrus trees and more.18455 Half Moon Street holds a sense of magic that cannot be found elsewhere.

Full Property Details for 18455 Half Moon St

General

  • Price: $8,200,000
  • Status: Active
  • Type: Single Family
  • Source: BAREIS
  • MLS ID: 325085716
  • Updated: 12/22/2025
  • Added to Site: 114 day(s) ago

Interior

  • Rooms/Areas: Guest Quarters, Media Room, Storage, Wine Cellar
  • Fireplace: Yes
  • Number of Fireplaces: 3
  • Fireplace(s): Den, Living Room, Primary Bedroom
  • Appliances: Built-In Gas Range, Built-In Refrigerator, Hood Over Range, Ice Maker
  • Flooring: Wood

Rooms

Bathrooms

  • Total Bathrooms: 6
  • Full Bathrooms: 4
  • Half Bathrooms: 2
  • Bathroom Features: Granite, Marble, Shower Stall(s), Tub

Bedrooms

  • Total Bedrooms: 5

Other Rooms

  • Living Room: Cathedral/Vaulted, Deck Attached, Open Beam Ceiling
  • Family Room: Great Room
  • Kitchen: Breakfast Area, Breakfast Room, Pantry Closet, Slab Counter
  • Dining Room: Formal Area, Formal Room
  • Laundry: Dryer Included, Inside Room, Washer Included

Additional Information

  • Pool: Yes
  • Pool Description: Built-In, Cabana
  • Security/Safety: Security Gate

Parking

  • Garage: Yes
  • Garage Spaces: 4
  • Garage Description: Detached

Location

  • Cross Streets: N. Castle Road
  • Driving Directions: From Sonoma Plaza, E. on E. Napa St, left on 7th St E., R Castle Rd, L N. Castle Rd. L Half Moon.

Heating & Cooling

  • Cooling Type: Central
  • Heating Type: Central

Utilities

  • Sewer: Septic System
  • Water: Well
  • Utility Description: Internet Available

Structural Information

  • Architectural Style: Mediterranean, Spanish
  • Construction: Frame, Stone, Stucco, Wood
  • Roof: Tile
  • Stories/Levels: 0
  • Square Feet: 5,736
  • Sq. Ft. Source: Assessor Agent-Fill
  • Year Built: 2005

Lot Features

  • Property View: Hills, Valley
  • Lot Size (Acres): 6.25
  • Lot Size (Sq. Ft.): 272,250
  • Lot Description: Pond Year Round, Private, Secluded

Disclosures and Reports

  • Special Conditions: None

Listing provided by Compass, Matt R Sevenau and Compass, Maurice Tegelaar

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Listing agents

— 18455 Half Moon St —

  • Matt R Sevenau

    Compass

  • Maurice Tegelaar

    Compass

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 18455 Half Moon St

School District:Sonoma Valley Unified School District
NameGradesDistance
Prestwood Elementary School
343 East Macarthur Street, Sonoma, CA 95476
K-51.6 mi
Adele Harrison Middle School
1150 BRd.way, Sonoma, CA 95476
6-82 mi
Sonoma Valley High School
20000 BRd.way, Sonoma, CA 95476
9-121.9 mi
Disclaimer: School attendance boundaries provided by Pitney Bowes and are for reference only. Contact the school directly to verify enrollment eligibility.

Tax History for 18455 Half Moon St

Year
Property Taxes
Change
Tax Assessment
Change
2025
$105,743
4%
$9,361,968
4%
2023
$101,885
1%
$8,998,433
2%
2022
$100,627
2%
$8,821,994
2%
2021
$98,828
—
$8,649,014
1%
2020
$98,795
2%
$8,560,330
2%
2019
$96,682
1%
$8,392,482
2%
2018
$95,291
2%
$8,227,925
2%
2017
$93,765
5%
$8,066,595
2%
2016
$89,098
3%
$7,908,427
2%
2015
$86,254
1%
$7,789,636
2%
2014
$84,986
1%
$7,637,049
—
2013
$84,176
—
$7,602,534
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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NMLS#: 1598647

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Listing provided by Compass, Matt R Sevenau and Compass, Maurice Tegelaar

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18455 Half Moon Street, Sonoma, CA 95476 (MLS# 325085716) is a Single Family property with 5 bedrooms, 4 full bathrooms and 2 partial bathrooms. 18455 Half Moon Street is currently listed for $8,200,000 and was received on September 24, 2025. Want to learn more about 18455 Half Moon Street? Do you have questions about finding other Single Family real estate for sale in Sonoma? You can browse all Sonoma real estate or contact a Coldwell Banker agent to request more information.

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