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Single Family ResidenceResidential
$275,982$113 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $125,700 on Aug 4, 2004

21503 SIROS ISLE DR

SPRING, TX 77388
4
Beds
2.5
Baths
2,451 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.
2004
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$276K
$262K low$290K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$125,700 · Aug 4, 2004

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,289 (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.$306,913 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$39,537
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$267,376
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$306,913
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$306,913

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.''

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyHARRIS
Lot (acres)The size of the land the home sits on, from county records.0.14
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
PoolWhether the property has a pool, and what kind, such as in-ground.No
ViewThe type of view from the property, or another feature of the site that affects value.Buildable
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 236 ft²

Transaction History(1)

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
Fox Elementary SchoolA-
Elementary · Grades PK–5 · 0.3 mi
M
Schindewolf Intermediate SchoolB
Middle · Grades 6–8 · 1.3 mi
H
Klein Collins High SchoolB-
High · Grades 9–12 · 1.4 mi

District: Klein Independent School District

Neighborhood · ZIP 77388These 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.50
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.24

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.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.7%
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.54,821
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,953 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$92,737
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$121,687
Average tempThe average temperature here across a full year.68°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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

21503 Siros Isle Dr 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 less than 67% of homes in Spring 77388
  • Costs less per square foot than 91% of homes in Spring 77388
  • Bigger than 72% of homes in Harris County
  • Has a smaller lot than 84% of homes in Spring 77388
  • Newer than 73% of homes in Spring 77388

What homes are worth in Spring 77388

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

This home
$205K$581K

This home is worth more than 33% of homes in Spring 77388.

How it measures up in Spring 77388

The dot is this home. The mark in the middle is the typical home in Spring 77388.

Estimated value$275,982
CheaperTypical $302,506Pricier

Pricier than 33% of homes nearby

Price per ft²$113
CheaperTypical $135Pricier

Pricier than 9% of homes nearby

Living area2,451 ft²
SmallerTypical 2,293 ft²Bigger

Bigger than 59% of homes nearby

Lot size0.14 ac
SmallerTypical 0.19 acBigger

Bigger than 16% of homes nearby

Year built2004
OlderTypical 1996Newer

Newer than 73% of homes nearby

How 21503 Siros Isle Dr ranks against every home in each area.
MeasureThis homeSpring 77388Harris County
Estimated valuepricier than$275,98233% of homes47% of homes
Price per ft²pricier than$1139% of homes9% of homes
Living areabigger than2,451 ft²59% of homes72% of homes
Lot sizebigger than0.14 ac16% of homes31% of homes
Year builtnewer than200473% of homes69% of homes

About 21503 Siros Isle Dr

How much is 21503 Siros Isle Dr, Spring, TX worth?

The TopHap Estimate for 21503 Siros Isle Dr, Spring, TX is $275,982 as of Oct 21, 2026. The likely range is $261,953 to $290,011. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21503 Siros Isle Dr, Spring, TX last sell?

21503 Siros Isle Dr, Spring, TX last sold on Aug 4, 2004 for $125,700, according to the county's recorded deed.

How big is 21503 Siros Isle Dr, Spring, TX?

21503 Siros Isle Dr, Spring, TX has 4 bedrooms, 2.5 bathrooms, 2,451 square feet of living space and a 0.14-acre lot.

When was 21503 Siros Isle Dr, Spring, TX built?

21503 Siros Isle Dr, Spring, TX was built in 2004, making it 22 years old. The building has 2 stories.

What schools serve 21503 Siros Isle Dr, Spring, TX?

21503 Siros Isle Dr, Spring, TX is assigned to Fox Elementary School (elementary), rated A-; Schindewolf Intermediate School (middle), rated B; Klein Collins High School (high), rated B-. All sit in Klein Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21503 Siros Isle Dr, Spring, TX compare to other homes in Spring 77388?

Among the 15,563 homes in Spring 77388, it is worth more than 33% of them ($275,982 against a typical $302,506), its price per square foot is higher than 9% of them ($113 against a typical $135), it is bigger than 59% of them (2,451 ft² against a typical 2,293 ft²), its lot is bigger than 16% of them (0.14 ac against a typical 0.19 ac) and it is newer than 73% of them (2004 against a typical 1996). Measured against all of Harris County, it is worth more than 47% 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 21503 Siros Isle Dr, Spring, TX?

The 2025 property tax bill for 21503 Siros Isle Dr, Spring, TX was $7,289. The county assessed it at $306,913.

More homes on Siros Isle Dr

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