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Single Family ResidenceResidential
$183,702$134 / 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 90How 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

821 S DUNCAN BYP

UNION, SC 29379
1
Baths
1,368 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.
1.45 ac
Lot SizeThe size of the land the home sits on, from county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$184K
$166K low$201K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$530 (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.$3,750 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$220
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$3,530
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$93,840
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$169,500

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.44
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
7
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
83
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
94
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
37
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.minimal

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
CountyUNION
Lot (acres)The size of the land the home sits on, from county records.1.45
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

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
Foster Park Elementary SchoolC-
Elementary · Grades PK–5 · 1.7 mi
M
Sims Middle SchoolB-
Middle · Grades 6–8 · 1.9 mi
H
Union County High SchoolD+
High · Grades 9–12 · 3.6 mi

District: Union County School District

Neighborhood · ZIP 29379These 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.123
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.98

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.87%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.12%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.23%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.18,493
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.72 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$46,299
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$60,588
Average tempThe average temperature here across a full year.61°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.61%

Owner Tools

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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

821 S Duncan Byp 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 68% of homes in Union 29379
  • Costs more per square foot than 76% of homes in Union 29379
  • Has a smaller lot than 68% of homes in Union County

What homes are worth in Union 29379

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

This home
$45K$426K

This home is worth more than 68% of homes in Union 29379.

How it measures up in Union 29379

The dot is this home. The mark in the middle is the typical home in Union 29379.

Estimated value$183,702
CheaperTypical $145,341Pricier

Pricier than 68% of homes nearby

Price per ft²$134
CheaperTypical $108Pricier

Pricier than 76% of homes nearby

Living area1,368 ft²
SmallerTypical 1,248 ft²Bigger

Bigger than 59% of homes nearby

Lot size1.45 ac
SmallerTypical 2.29 acBigger

Bigger than 35% of homes nearby

How 821 S Duncan Byp ranks against every home in each area.
MeasureThis homeUnion 29379Union County
Estimated valuepricier than$183,70268% of homes67% of homes
Price per ft²pricier than$13476% of homes73% of homes
Living areabigger than1,368 ft²59% of homes60% of homes
Lot sizebigger than1.45 ac35% of homes32% of homes

About 821 S Duncan Byp

How much is 821 S Duncan Byp, Union, SC worth?

The TopHap Estimate for 821 S Duncan Byp, Union, SC is $183,702 as of Aug 30, 2026. The likely range is $166,031 to $201,373. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 821 S Duncan Byp, Union, SC last sell?

821 S Duncan Byp, Union, SC last sold on Mar 8, 2010, according to the county's recorded deed.

How big is 821 S Duncan Byp, Union, SC?

821 S Duncan Byp, Union, SC has 1 bathrooms, 1,368 square feet of living space and a 1.45-acre lot.

What schools serve 821 S Duncan Byp, Union, SC?

821 S Duncan Byp, Union, SC is assigned to Foster Park Elementary School (elementary), rated C-; Sims Middle School (middle), rated B-; Union County High School (high), rated D+. All sit in Union County School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 821 S Duncan Byp, Union, SC compare to other homes in Union 29379?

Among the 7,969 homes in Union 29379, it is worth more than 68% of them ($183,702 against a typical $145,341), its price per square foot is higher than 76% of them ($134 against a typical $108), it is bigger than 59% of them (1,368 ft² against a typical 1,248 ft²) and its lot is bigger than 35% of them (1.45 ac against a typical 2.29 ac). Measured against all of Union County, it is worth more than 67% 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 821 S Duncan Byp, Union, SC?

The 2025 property tax bill for 821 S Duncan Byp, Union, SC was $530. The county assessed it at $3,750.

More homes on S Duncan Byp

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