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Single Family ResidenceResidential
$2,061,623$472 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 97How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $1,439,990 on May 3, 2018

21840 SE 1ST ST

SAMMAMISH, WA 98074
5
Beds
4.3
Baths
4,370 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
2018
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$2.1M
$2M low$2.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,439,990 · May 3, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$20,897 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$2,370,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$486,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,884,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$2,116,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,370,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyKING
Lot (acres)The size of the land the home sits on, from county records.0.14
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 280 ft²

Transaction History(3)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

H
Eastlake High SchoolA+
High · Grades 9–12 · 0.8 mi
E
Samantha Smith Elementary SchoolA
Elementary · Grades KG–5 · 1.3 mi
M
Inglewood Middle SchoolA
Middle · Grades 6–8 · 1.6 mi

District: Lake Washington School District

Neighborhood · ZIP 98074These 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.20
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.113
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.287

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.43%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.30,936
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,488 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$201,628
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$241,805
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.43%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

21840 Se 1st St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 93% of homes in King County
  • Costs less per square foot than 89% of homes in Sammamish 98074
  • Bigger than 96% of homes in King County
  • Has a smaller lot than 87% of homes in Sammamish 98074
  • Newer than 96% of homes in King County

What homes are worth in Sammamish 98074

Each bar is how many homes fall in that price range. The marker is this home.

This home
$481K$3.2M

This home is worth more than 87% of homes in Sammamish 98074.

How it measures up in Sammamish 98074

The dot is this home. The mark in the middle is the typical home in Sammamish 98074.

Estimated value$2,061,623
CheaperTypical $1,490,370Pricier

Pricier than 87% of homes nearby

Price per ft²$472
CheaperTypical $574Pricier

Pricier than 11% of homes nearby

Living area4,370 ft²
SmallerTypical 2,630 ft²Bigger

Bigger than 94% of homes nearby

Lot size0.14 ac
SmallerTypical 0.24 acBigger

Bigger than 13% of homes nearby

Year built2018
OlderTypical 1991Newer

Newer than 95% of homes nearby

How 21840 Se 1st St ranks against every home in each area.
MeasureThis homeSammamish 98074King County
Estimated valuepricier than$2,061,62387% of homes93% of homes
Price per ft²pricier than$47211% of homes46% of homes
Living areabigger than4,370 ft²94% of homes96% of homes
Lot sizebigger than0.14 ac13% of homes28% of homes
Year builtnewer than201895% of homes96% of homes

About 21840 Se 1st St

How much is 21840 Se 1st St, Sammamish, WA worth?

The TopHap Estimate for 21840 Se 1st St, Sammamish, WA is $2,061,623 as of Aug 30, 2026. The likely range is $1,997,800 to $2,125,446. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21840 Se 1st St, Sammamish, WA last sell?

21840 Se 1st St, Sammamish, WA last sold on May 3, 2018 for $1,439,990, according to the county's recorded deed.

How big is 21840 Se 1st St, Sammamish, WA?

21840 Se 1st St, Sammamish, WA has 5 bedrooms, 4.3 bathrooms, 4,370 square feet of living space and a 0.14-acre lot.

When was 21840 Se 1st St, Sammamish, WA built?

21840 Se 1st St, Sammamish, WA was built in 2018, making it 8 years old. The building has 2 stories.

What schools serve 21840 Se 1st St, Sammamish, WA?

21840 Se 1st St, Sammamish, WA is assigned to Eastlake High School (high), rated A+; Samantha Smith Elementary School (elementary), rated A; Inglewood Middle School (middle), rated A. All sit in Lake Washington School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21840 Se 1st St, Sammamish, WA compare to other homes in Sammamish 98074?

Among the 9,921 homes in Sammamish 98074, it is worth more than 87% of them ($2,061,623 against a typical $1,490,370), its price per square foot is higher than 11% of them ($472 against a typical $574), it is bigger than 94% of them (4,370 ft² against a typical 2,630 ft²), its lot is bigger than 13% of them (0.14 ac against a typical 0.24 ac) and it is newer than 95% of them (2018 against a typical 1991). Measured against all of King County, it is worth more than 93% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 21840 Se 1st St, Sammamish, WA?

The 2026 property tax bill for 21840 Se 1st St, Sammamish, WA was $20,897. The county assessed it at $2,370,000.

More homes on Se 1st St

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Assigned schools

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