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Single Family ResidenceResidential
$954,543$314 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $640,636 on Oct 29, 2020

23108 ALDER LN SE

BLACK DIAMOND, WA 98010
5
Beds
2.8
Baths
3,040 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.
0.13 ac
Lot SizeThe size of the land the home sits on, from county records.
2020
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

$955K
$894K low$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.$640,636 · Oct 29, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,493 (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.$867,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$422,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$445,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$832,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$867,000

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.0.13
HeatingThe type of heating system in the home.Heat Pump
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 · 240 ft²

Transaction History(2)

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.

E
Black Diamond Elementary SchoolB
Elementary · Grades KG–5 · 1.4 mi
M
Thunder Mountain Middle SchoolB
Middle · Grades 6–8 · 6.2 mi
H
Enumclaw High SchoolB-
High · Grades 9–12 · 8.1 mi

District: Enumclaw School District

Neighborhood · ZIP 98010These 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.83
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.116
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.237

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.6,853
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.363 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$136,748
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$169,893
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.54 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

23108 Alder Ln Se 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 78% of homes in Black Diamond 98010
  • Costs less per square foot than 91% of homes in King County
  • Bigger than 85% of homes in King County
  • Has a smaller lot than 76% of homes in King County
  • Newer than 97% of homes in King County

What homes are worth in Black Diamond 98010

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

This home
$407K$1.8M

This home is worth more than 78% of homes in Black Diamond 98010.

How it measures up in Black Diamond 98010

The dot is this home. The mark in the middle is the typical home in Black Diamond 98010.

Estimated value$954,543
CheaperTypical $767,659Pricier

Pricier than 78% of homes nearby

Price per ft²$314
CheaperTypical $361Pricier

Pricier than 31% of homes nearby

Living area3,040 ft²
SmallerTypical 2,260 ft²Bigger

Bigger than 79% of homes nearby

Lot size0.13 ac
SmallerTypical 0.16 acBigger

Bigger than 42% of homes nearby

Year built2020
OlderTypical 2009Newer

Newer than 67% of homes nearby

How 23108 Alder Ln Se ranks against every home in each area.
MeasureThis homeBlack Diamond 98010King County
Estimated valuepricier than$954,54378% of homes58% of homes
Price per ft²pricier than$31431% of homes9% of homes
Living areabigger than3,040 ft²79% of homes85% of homes
Lot sizebigger than0.13 ac42% of homes24% of homes
Year builtnewer than202067% of homes97% of homes

About 23108 Alder Ln Se

How much is 23108 Alder Ln Se, Black Diamond, WA worth?

The TopHap Estimate for 23108 Alder Ln Se, Black Diamond, WA is $954,543 as of Sep 24, 2026. The likely range is $894,467 to $1,014,619. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 23108 Alder Ln Se, Black Diamond, WA last sell?

23108 Alder Ln Se, Black Diamond, WA last sold on Oct 29, 2020 for $640,636, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 23108 Alder Ln Se, Black Diamond, WA?

23108 Alder Ln Se, Black Diamond, WA has 5 bedrooms, 2.8 bathrooms, 3,040 square feet of living space and a 0.13-acre lot.

When was 23108 Alder Ln Se, Black Diamond, WA built?

23108 Alder Ln Se, Black Diamond, WA was built in 2020, making it 6 years old. The building has 2 stories.

What schools serve 23108 Alder Ln Se, Black Diamond, WA?

23108 Alder Ln Se, Black Diamond, WA is assigned to Black Diamond Elementary School (elementary), rated B; Thunder Mountain Middle School (middle), rated B; Enumclaw High School (high), rated B-. All sit in Enumclaw School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 23108 Alder Ln Se, Black Diamond, WA compare to other homes in Black Diamond 98010?

Among the 3,636 homes in Black Diamond 98010, it is worth more than 78% of them ($954,543 against a typical $767,659), its price per square foot is higher than 31% of them ($314 against a typical $361), it is bigger than 79% of them (3,040 ft² against a typical 2,260 ft²), its lot is bigger than 42% of them (0.13 ac against a typical 0.16 ac) and it is newer than 67% of them (2020 against a typical 2009). Measured against all of King County, it is worth more than 58% 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 23108 Alder Ln Se, Black Diamond, WA?

The 2026 property tax bill for 23108 Alder Ln Se, Black Diamond, WA was $7,493. The county assessed it at $867,000.

More homes on Alder Ln Se

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Assigned schools

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