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Single Family ResidenceResidential
$1,653,075$1,192 / 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 89How 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 $1,650,000 on Apr 13, 2026

21 PORTSMOUTH RD

PIEDMONT, CA 94610
3
Beds
1
Baths
1,387 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.
3,320 ft²
Lot SizeThe size of the land the home sits on, from county records.
1918
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.7M
$1.5M low$1.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,650,000 · Apr 13, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,193 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,750,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$525,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,225,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$133,214
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,583,550

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyALAMEDA
Lot (acres)The size of the land the home sits on, from county records.0.08
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Roll Tar & Gravel
HeatingThe type of heating system in the home.Floor/Wall Furnace
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
Wildwood Elementary SchoolA+
Elementary · Grades KG–5 · 0.2 mi
M
Piedmont Middle SchoolA+
Middle · Grades 6–8 · 0.4 mi
H
Piedmont High SchoolA+
High · Grades 9–12 · 0.4 mi

District: Piedmont City Unified School District

Neighborhood · ZIP 94610These 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.126
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.507

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.31,044
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.14,202 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$132,514
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$172,604
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.22 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

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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

21 Portsmouth Rd 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 83% of homes in Alameda County
  • Costs more per square foot than 98% of homes in Alameda County
  • Smaller than 67% of homes in Oakland 94610
  • Has a smaller lot than 94% of homes in Oakland 94610
  • Older than 90% of homes in Alameda County

What homes are worth in Oakland 94610

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

This home
$254K$3.6M

This home is worth more than 72% of homes in Oakland 94610.

How it measures up in Oakland 94610

The dot is this home. The mark in the middle is the typical home in Oakland 94610.

Estimated value$1,653,075
CheaperTypical $1,234,986Pricier

Pricier than 72% of homes nearby

Price per ft²$1192
CheaperTypical $647Pricier

Pricier than 97% of homes nearby

Living area1,387 ft²
SmallerTypical 1,846 ft²Bigger

Bigger than 33% of homes nearby

Lot size3,320 ft²
SmallerTypical 0.14 acBigger

Bigger than 6% of homes nearby

Year built1918
OlderTypical 1926Newer

Newer than 16% of homes nearby

How 21 Portsmouth Rd ranks against every home in each area.
MeasureThis homeOakland 94610Alameda County
Estimated valuepricier than$1,653,07572% of homes83% of homes
Price per ft²pricier than$119297% of homes98% of homes
Living areabigger than1,387 ft²33% of homes38% of homes
Lot sizebigger than3,320 ft²6% of homes11% of homes
Year builtnewer than191816% of homes10% of homes

About 21 Portsmouth Rd

How much is 21 Portsmouth Rd, Piedmont, CA worth?

The TopHap Estimate for 21 Portsmouth Rd, Piedmont, CA is $1,653,075 as of Sep 24, 2026. The likely range is $1,467,499 to $1,838,651. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Portsmouth Rd, Piedmont, CA last sell?

21 Portsmouth Rd, Piedmont, CA last sold on Apr 13, 2026 for $1,650,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Portsmouth Rd, Piedmont, CA?

21 Portsmouth Rd, Piedmont, CA has 3 bedrooms, 1 bathrooms, 1,387 square feet of living space and a 0.08-acre lot.

When was 21 Portsmouth Rd, Piedmont, CA built?

21 Portsmouth Rd, Piedmont, CA was built in 1918, making it 108 years old. The building has 1 story.

What schools serve 21 Portsmouth Rd, Piedmont, CA?

21 Portsmouth Rd, Piedmont, CA is assigned to Wildwood Elementary School (elementary), rated A+; Piedmont Middle School (middle), rated A+; Piedmont High School (high), rated A+. All sit in Piedmont City Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Portsmouth Rd, Piedmont, CA compare to other homes in Oakland 94610?

Among the 7,546 homes in Oakland 94610, it is worth more than 72% of them ($1,653,075 against a typical $1,234,986), its price per square foot is higher than 97% of them ($1192 against a typical $647), it is bigger than 33% of them (1,387 ft² against a typical 1,846 ft²), its lot is bigger than 6% of them (3,320 ft² against a typical 0.14 ac) and it is newer than 16% of them (1918 against a typical 1926). Measured against all of Alameda County, it is worth more than 83% 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 21 Portsmouth Rd, Piedmont, CA?

The 2025 property tax bill for 21 Portsmouth Rd, Piedmont, CA was $7,193. The county assessed it at $1,750,000.

More homes on Portsmouth Rd

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More homes in Piedmont 94610

Assigned schools

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