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Single Family ResidenceResidential
$420,000$212 / 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 96How 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 $447,279 on Nov 19, 2024

3521 MAINER ST

HOUSTON, TX 77021
3
Beds
2.5
Baths
1,978 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.
2,500 ft²
Lot SizeThe size of the land the home sits on, from county records.
2024
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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

$420K
$402K low$438K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$447,279 · Nov 19, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,952 (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.$362,854 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$66,750
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$296,104
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$374,155
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$362,854

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.13 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
StyleThe architectural style of the home, such as ranch or colonial.Traditional/Old
CountyHARRIS
Lot (acres)The size of the land the home sits on, from county records.0.06
ConstructionThe main material the home's frame and walls are built from.Metal 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.Neighborhood
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 60 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.

E
Whidby Elementary MagnetC-
Elementary · Grades EE–5 · 0.3 mi
M
Cullen Middle SchoolC-
Middle · Grades 6–8 · 0.7 mi
H
Yates High SchoolC+
High · Grades 9–12 · 2.9 mi

District: Houston Independent School District

Neighborhood · ZIP 77021These 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.160
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.19

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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.28%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.29,813
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,985 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$55,952
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$84,937
Average tempThe average temperature here across a full year.69°F
Annual precipHow much rain and melted snow falls here in a typical year.51 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

3521 Mainer 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.

  • Among the most valuable homes in Greater OST / South Union
  • Costs more per square foot than 96% of homes in Greater OST / South Union
  • Bigger than 85% of homes in Greater OST / South Union
  • Has a smaller lot than 94% of homes in Harris County
  • Among the newest homes in Greater OST / South Union

What homes are worth in Houston 77021

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

This home
$113K$909K

This home is worth more than 88% of homes in Houston 77021.

How it measures up in Houston 77021

The dot is this home. The mark in the middle is the typical home in Houston 77021.

Estimated value$420,000
CheaperTypical $210,668Pricier

Pricier than 88% of homes nearby

Price per ft²$212
CheaperTypical $153Pricier

Pricier than 91% of homes nearby

Living area1,978 ft²
SmallerTypical 1,500 ft²Bigger

Bigger than 74% of homes nearby

Lot size2,500 ft²
SmallerTypical 0.15 acBigger

Bigger than 13% of homes nearby

Year built2024
OlderTypical 1951Newer

Newer than almost all homes nearby

How 3521 Mainer St ranks against every home in each area.
MeasureThis homeGreater OST / South UnionHouston 77021Harris County
Estimated valuepricier than$420,000almost all homes88% of homes77% of homes
Price per ft²pricier than$21296% of homes91% of homes85% of homes
Living areabigger than1,978 ft²85% of homes74% of homes53% of homes
Lot sizebigger than2,500 ft²12% of homes13% of homes6% of homes
Year builtnewer than2024almost all homesalmost all homesalmost all homes

About 3521 Mainer St

How much is 3521 Mainer St, Houston, TX worth?

The TopHap Estimate for 3521 Mainer St, Houston, TX is $420,000 as of Aug 30, 2026. The likely range is $401,563 to $438,437. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3521 Mainer St, Houston, TX last sell?

3521 Mainer St, Houston, TX last sold on Nov 19, 2024 for $447,279, according to the county's recorded deed.

How big is 3521 Mainer St, Houston, TX?

3521 Mainer St, Houston, TX has 3 bedrooms, 2.5 bathrooms, 1,978 square feet of living space and a 0.06-acre lot.

When was 3521 Mainer St, Houston, TX built?

3521 Mainer St, Houston, TX was built in 2024, making it 2 years old. It is a traditional/old home. The building has 1 story.

What schools serve 3521 Mainer St, Houston, TX?

3521 Mainer St, Houston, TX is assigned to Whidby Elementary Magnet (elementary), rated C-; Cullen Middle School (middle), rated C-; Yates High School (high), rated C+. All sit in Houston Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3521 Mainer St, Houston, TX compare to other homes in Houston 77021?

Among the 8,339 homes in Houston 77021, it is worth more than 88% of them ($420,000 against a typical $210,668), its price per square foot is higher than 91% of them ($212 against a typical $153), it is bigger than 74% of them (1,978 ft² against a typical 1,500 ft²), its lot is bigger than 13% of them (2,500 ft² against a typical 0.15 ac) and it is newer than almost all of them (2024 against a typical 1951). Measured against all of Harris County, it is worth more than 77% 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 3521 Mainer St, Houston, TX?

The 2025 property tax bill for 3521 Mainer St, Houston, TX was $7,952. The county assessed it at $362,854.

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