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Single Family ResidenceResidential
$705,639$364 / 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 Aug 30, 2026

21 LAKE DR

ROUND ROCK, TX 78665
2
Baths
1,938 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.
2.5 ac
Lot SizeThe size of the land the home sits on, from county records.
1986
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$706K
$673K low$738K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,280 (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.$716,068 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$428,640
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$287,428
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$716,068

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.49
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
49
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
100
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
49
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
46
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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
CountyWILLIAMSON
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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, Detached
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 · 490 ft²

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

M
Hopewell Middle SchoolB-
Middle · Grades 6–8 · 0.7 mi
E
Union Hill Elementary SchoolC-
Elementary · Grades PK–5 · 0.8 mi
H
Stony Point High SchoolC+
High · Grades 9–12 · 1.1 mi

District: Round Rock Independent School District

Neighborhood · ZIP 78665These 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.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.17

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.1%
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.68,549
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,056 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$112,722
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$135,285
Average tempThe average temperature here across a full year.67°F
Annual precipHow much rain and melted snow falls here in a typical year.35 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.60%

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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 Lake 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 more than 95% of homes in Round Rock 78665
  • Among the highest price per square foot in Round Rock 78665
  • Smaller than 71% of homes in Round Rock 78665
  • Among the largest lots in Round Rock 78665
  • Among the oldest homes in Round Rock 78665

What homes are worth in Round Rock 78665

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

This home
$285K$790K

This home is worth more than 95% of homes in Round Rock 78665.

How it measures up in Round Rock 78665

The dot is this home. The mark in the middle is the typical home in Round Rock 78665.

Estimated value$705,639
CheaperTypical $407,334Pricier

Pricier than 95% of homes nearby

Price per ft²$364
CheaperTypical $183Pricier

Pricier than almost all homes nearby

Living area1,938 ft²
SmallerTypical 2,319 ft²Bigger

Bigger than 29% of homes nearby

Lot size2.5 ac
SmallerTypical 0.18 acBigger

Bigger than almost all homes nearby

Year built1986
OlderTypical 2010Newer

Older than almost all homes nearby

How 21 Lake Dr ranks against every home in each area.
MeasureThis homeRound Rock 78665Williamson County
Estimated valuepricier than$705,63995% of homes89% of homes
Price per ft²pricier than$364almost all homesalmost all homes
Living areabigger than1,938 ft²29% of homes42% of homes
Lot sizebigger than2.5 acalmost all homes94% of homes
Year builtnewer than1986almost no homes16% of homes

About 21 Lake Dr

How much is 21 Lake Dr, Round Rock, TX worth?

The TopHap Estimate for 21 Lake Dr, Round Rock, TX is $705,639 as of Aug 30, 2026. The likely range is $672,833 to $738,445. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Lake Dr, Round Rock, TX last sell?

21 Lake Dr, Round Rock, TX last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Lake Dr, Round Rock, TX?

21 Lake Dr, Round Rock, TX has 2 bathrooms and 1,938 square feet of living space.

When was 21 Lake Dr, Round Rock, TX built?

21 Lake Dr, Round Rock, TX was built in 1986, making it 40 years old. The building has 1 story.

What schools serve 21 Lake Dr, Round Rock, TX?

21 Lake Dr, Round Rock, TX is assigned to Hopewell Middle School (middle), rated B-; Union Hill Elementary School (elementary), rated C-; Stony Point High School (high), rated C+. All sit in Round Rock Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Lake Dr, Round Rock, TX compare to other homes in Round Rock 78665?

Among the 20,801 homes in Round Rock 78665, it is worth more than 95% of them ($705,639 against a typical $407,334), its price per square foot is higher than almost all of them ($364 against a typical $183), it is bigger than 29% of them (1,938 ft² against a typical 2,319 ft²), its lot is bigger than almost all of them (2.5 ac against a typical 0.18 ac) and it is newer than almost none of them (1986 against a typical 2010). Measured against all of Williamson County, it is worth more than 89% 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 Lake Dr, Round Rock, TX?

The 2025 property tax bill for 21 Lake Dr, Round Rock, TX was $3,280. The county assessed it at $716,068.

More homes on Lake Dr

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