20518 Monument Rd SW is a 4,430 square foot house on a 10.77 acre lot with 3 bedrooms and 3 bathrooms. Based on Redfin's Vashon data, we estimate the home's value is $1,838,139.
Single-familyProperty Type
1999Year Built
10.77 acresLot Size
$415Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$1,838,139
$299K since August
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 34.2% higher than the average sale price ($1.37M) 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*
2026
$17,957 (−0.9%)
$421,000 + $1,381,000
$1,802,000
2025
$18,126 (−1.7%)
$421,000 + $1,381,000
$1,802,000
2024
$18,433 (+3.6%)
$395,000 + $1,466,000
$1,861,000
2023
$17,785 (+3.4%)
$385,000 + $1,462,000
$1,847,000
2022
$17,202 (+9.4%)
$424,000 + $1,678,000
$2,102,000
2021
$15,731 (+9.9%)
$334,000 + $1,294,000
$1,628,000
2020
$14,309 (+12.2%)
$304,000 + $1,057,000
$1,361,000
2019
$12,750 (+3.3%)
$317,000 + $951,000
$1,268,000
2018
$12,349 (+23.7%)
$317,000 + $951,000
$1,268,000
2017
$9,980 (+1.6%)
$302,000 + $823,000
$1,125,000
2016
$9,821 (+2.1%)
$259,000 + $703,000
$962,000
2015
$9,616 (+7.2%)
$259,000 + $662,000
$921,000
2014
$8,973 (+5.9%)
$176,000 + $667,000
$843,000
2013
$8,471 (−2.4%)
$176,000 + $531,000
$707,000
2012
$8,683 (+2.2%)
$176,000 + $531,000
$707,000
2011
$8,498 (−3.4%)
$210,000 + $608,000
$818,000
2010
$8,795 (+12.8%)
$210,000 + $720,000
$930,000
2009
$7,797
$210,000 + $795,000
$1,005,000
Tax history for 20518 Monument Rd SW
Year
Property tax
Land + Additions
Assessment*
2026
$17,957 (−0.9%)
$421,000 + $1,381,000
$1,802,000
2025
$18,126 (−1.7%)
$421,000 + $1,381,000
$1,802,000
2024
$18,433 (+3.6%)
$395,000 + $1,466,000
$1,861,000
2023
$17,785 (+3.4%)
$385,000 + $1,462,000
$1,847,000
2022
$17,202 (+9.4%)
$424,000 + $1,678,000
$2,102,000
2021
$15,731 (+9.9%)
$334,000 + $1,294,000
$1,628,000
2020
$14,309 (+12.2%)
$304,000 + $1,057,000
$1,361,000
2019
$12,750 (+3.3%)
$317,000 + $951,000
$1,268,000
2018
$12,349 (+23.7%)
$317,000 + $951,000
$1,268,000
2017
$9,980 (+1.6%)
$302,000 + $823,000
$1,125,000
2016
$9,821 (+2.1%)
$259,000 + $703,000
$962,000
2015
$9,616 (+7.2%)
$259,000 + $662,000
$921,000
2014
$8,973 (+5.9%)
$176,000 + $667,000
$843,000
2013
$8,471 (−2.4%)
$176,000 + $531,000
$707,000
2012
$8,683 (+2.2%)
$176,000 + $531,000
$707,000
2011
$8,498 (−3.4%)
$210,000 + $608,000
$818,000
2010
$8,795 (+12.8%)
$210,000 + $720,000
$930,000
2009
$7,797
$210,000 + $795,000
$1,005,000
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Permits
Jul 3, 2012 • Final
Residential building - mobile
Install a new manufactured home with three bedrooms.
New construction
Jul 3, 2012 • Final
Building historical
Construct a new single-family home and a three-car garage. The project includes a manufactured home.
Addition
New construction
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
Bathroom Information
# of Full Baths: 3
Heating & Cooling
Heating Type: Forced Air
Exterior
Exterior Information
Physical Condition: Average
Building Construction Quality: Good
Building Type: Single Family
Property Information
Living Sq. Ft: 4,430
Ground Floor Sq. Ft: 2,860
Building Sq. Ft: 4,430
# of Stories: 2
Legal Description: W HALF W HALF SW QTR SE QTR STR 05-22-03 AND PORTION OF NE QTR SE QTR SW QTR STR 05-22-03 LYING ELY OF E RIGHT OF WAY MARGIN OF MONUMENT RD SW AKA VASHON ISLAND RD AND PORTION OF S 95 FT OF N 750 FT OF E HALF SE QTR SW STR 05-22-05 LYING ELY OF E RIGHT OF WAY MARGIN OF MONUMENT RD SW ( INCLUDING VACATED PORTION OF 91ST AVE SW AKA BLOOM RD THEREIN LYING NORTH OF NELY MARGIN OF MONUMENT RD SW EXC PORTION LYING WITHIN RIGHT OF WAY OF SW ELLISPORT RD AS VACATED BY KING CO ORDINANCE NO 11098, ADOPTED 1 NOVEMBER 1993) CLASSIFIED AS OPEN SPACE LAND UNDER RCW 84.34 PLAT BLOCK: PLAT LOT:
Lot Information
# of Buildings: 1
Land Sq. Ft: 469,141
Municipality Name: KING COUNTY
Acres: 10.77
Zoning Code: RA5SO
County Use Description: SINGLE FAMILY(RES USE/ZONE)
Utility Information
Sewer Type: Private
Water Service Type: Private
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 3
Baths: 3.0
Sq. Ft.: 4,430
Stories: 2.0
Lot Size: 10.77 acres
Style: Single Family Residential
Year Built: 1999
Year Renovated: —
County: King County
APN: 052203 9049
Home facts updated by county records on Sep 5, 2026
Around this home
Schools
Chautauqua Elementary School
Public PreK-5 • Assigned • 0.5mi
8/10
Mcmurray Middle School
Public 6-8 • Assigned • 0.6mi
8/10
Vashon Island High School
Public 9-12 • Assigned • 0.4mi
9/10
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
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
3/10 Heat Factor
7 days above 87° expected this year, 15 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
6/10 Air Factor
8 unhealthy days expected this year, 9 days in 30 years
Provided by First Street
Historical weather
Vashon, WA • 98070
Average low and high temperatures (°F)
46
37
47
38
52
41
60
44
65
48
71
52
77
55
76
58
70
54
59
47
51
43
48
41
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 8.8 hours in
June and 1.7 hours in December, placing it below the
U.S. average for solar exposure.
8.8 hrs
1.7 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.75M – $2.11M
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