21554 Duncan Rd is a 1,096 square foot house on a 4.37 acre lot with 1 bedroom and 1 bathroom. Based on Redfin's Monte Rio data, we estimate the home's value is $618,922.
Single-familyProperty Type
1940Year Built
4.37 acresLot Size
$565Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$618,922
$56K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 21.4% higher than the average sale price ($510K) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$1,276 (−14.5%)
$3,985 + $66,466
$70,451
2024
$1,492 (+228.6%)
$3,907 + $65,163
$69,070
2023
$454 (+48.0%)
$3,831 + $80,800
$84,631
2022
$307 (−39.5%)
$3,756 + $79,216
$82,972
2021
$507 (−8.6%)
$3,683 + $77,663
$81,346
2020
$554 (+16.8%)
$3,611 + $76,141
$79,752
2019
$475 (+73.6%)
$3,574 + $75,361
$78,935
2018
$273 (+0.3%)
$3,504 + $73,884
$77,388
2017
$273 (−35.7%)
$3,369 + $71,016
$74,385
2015
$424 (+58.2%)
$3,303 + $69,624
$72,927
2014
$268 (+0.1%)
$3,191 + $67,236
$70,427
2013
$268 (+9.4%)
$3,191 + $67,236
$70,427
2012
$245 (+0.2%)
$3,177 + $66,933
$70,110
2011
$244
$3,115 + $65,621
$68,736
2010
$244 (−38.8%)
$3,054 + $64,335
$67,389
2009
$399 (+36.2%)
$3,032 + $63,855
$66,887
2007
$293
$2,981 + $62,752
$65,733
Tax history for 21554 Duncan Rd
Year
Property tax
Land + Additions
Assessment*
2025
$1,276 (−14.5%)
$3,985 + $66,466
$70,451
2024
$1,492 (+228.6%)
$3,907 + $65,163
$69,070
2023
$454 (+48.0%)
$3,831 + $80,800
$84,631
2022
$307 (−39.5%)
$3,756 + $79,216
$82,972
2021
$507 (−8.6%)
$3,683 + $77,663
$81,346
2020
$554 (+16.8%)
$3,611 + $76,141
$79,752
2019
$475 (+73.6%)
$3,574 + $75,361
$78,935
2018
$273 (+0.3%)
$3,504 + $73,884
$77,388
2017
$273 (−35.7%)
$3,369 + $71,016
$74,385
2015
$424 (+58.2%)
$3,303 + $69,624
$72,927
2014
$268 (+0.1%)
$3,191 + $67,236
$70,427
2013
$268 (+9.4%)
$3,191 + $67,236
$70,427
2012
$245 (+0.2%)
$3,177 + $66,933
$70,110
2011
$244
$3,115 + $65,621
$68,736
2010
$244 (−38.8%)
$3,054 + $64,335
$67,389
2009
$399 (+36.2%)
$3,032 + $63,855
$66,887
2007
$293
$2,981 + $62,752
$65,733
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
RRD B6 160
SR
RC 50'
Resources and Rural Development - B6 Combining District - One Dwelling per 160 Acres
Protects lands needed for: Commercial timber production, geothermal production, aggregate resources production; Watershed, fish and wildlife habitat, biotic resources; and Agricultural production activities not subject to the agricultural resources element of the general plan. Allows very low-density residential development and recreational and visitor-serving uses where compatible with resource use and available public services; and Implements the resources and rural development land use category of the general plan.; B Combining District: to specify residential density and/or minimum parcel or lot size for a particular parcel, lot or area.
Zone overlays
Scenic Resources Combining District
Riparian Corridor Combining Zone
Permitted uses
Include but are not limited to:
Agriculture
Greenhouse / nursery
Livestock production
Housing-Group
Housing-Single unit
Jun 15, 2023 • Final
Building permit no plan check
Install electrical service for a septic system.
Electrical
Jan 10, 2023 • Final
Demolition
Demolition
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Basement Information
Basement Sq. Ft: 320
Bathroom Information
# of Full Baths: 1
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 3
Exterior
Exterior Information
Building Style Type: Square Design
Construction Type: Wood/Steel
Building Construction Quality: Poor
Property Information
Subdivision Name: MONTE CRISTO 01
Living Sq. Ft: 1,096
Building Sq. Ft: 1,216
# of Stories: 1
Parking & Garage Information
Parking Type: Carport
Garage/Parking Sq. Ft: 198
Garage / Carport Type: Carport
Lot Information
# of Buildings: 1
Land Sq. Ft: 190,357
Legal Lot Number: 139
Acres: 4.37
Zoning Code: RRD160
County Use Description: RURAL RESID-1 RESID
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 1
Baths: 1.0
Sq. Ft.: 1,096
Stories: 1.0
Lot Size: 4.37 acres
Style: Single Family Residential
Year Built: 1940
Year Renovated: 1945
County: Sonoma County
APN: 094052001000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Monte Rio Elementary School
Public K-8 • Assigned • 0.5mi
7/10
Analy High School
Public 9-12 • Assigned • 11.4mi
8/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
3/10 Fire Factor
0.15% chance of being in a wildfire in next 30 years
2/10 Heat Factor
8 days above 84° expected this year, 21 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
9/10 Air Factor
17 unhealthy days expected this year, 19 days in 30 years
Provided by First Street
Historical weather
Monte Rio, CA • 95462
Average low and high temperatures (°F)
59
40
60
43
69
44
66
46
74
49
75
51
73
52
82
53
78
53
75
49
62
45
58
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10.6 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
10.6 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$588,000 – $712,000
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