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Single Family ResidenceResidential
$506,490$373 / 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 84How 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 ALLWAY ST

CHARLESTON, SC 29403
3
Beds
2
Baths
1,358 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1935
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$506K
$423K low$590K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,801 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$5,610 (2024)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$5,610
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$246,301

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.60
99
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
8
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
81
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
65
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
49
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.47 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.99%
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.1 percent flood zone

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.Bungalow
CountyCharleston
Lot (acres)The size of the land the home sits on, from county records.0.11
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
HeatingThe type of heating system in the home.Floor/Wall Furnace
CoolingThe type of cooling or air conditioning in the home.None
FireplaceWhether the home has a fireplace, and what kind.Yes
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 · 316 ft²

Transaction History(6)

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.

H
Burke High SchoolF
High · Grades 9–12 · 0.3 mi
M
Simmons-Pinckney Middle SchoolC-
Middle · Grades 6–8 · 0.4 mi
E
Julian Mitchell Elementary SchoolD-
Elementary · Grades PK–5 · 0.5 mi

District: Charleston County School District

Neighborhood · ZIP 29403These 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.136
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.337

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.77%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.21%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.22,498
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,949 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$69,730
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$102,723
Average tempThe average temperature here across a full year.66°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.63%

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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 Allway 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.

  • Worth less than 86% of homes in Westside
  • Costs less per square foot than 94% of homes in Charleston 29403
  • Smaller than 67% of homes in Charleston County
  • Has a bigger lot than 87% of homes in Westside
  • Older than 95% of homes in Charleston County

What homes are worth in Charleston 29403

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

This home
$315K$2.6M

This home is worth more than 15% of homes in Charleston 29403.

How it measures up in Charleston 29403

The dot is this home. The mark in the middle is the typical home in Charleston 29403.

Estimated value$506,490
CheaperTypical $909,509Pricier

Pricier than 15% of homes nearby

Price per ft²$373
CheaperTypical $644Pricier

Pricier than 6% of homes nearby

Living area1,358 ft²
SmallerTypical 1,554 ft²Bigger

Bigger than 39% of homes nearby

Lot size0.11 ac
SmallerTypical 0.1 acBigger

Bigger than 69% of homes nearby

Year built1935
OlderTypical 1938Newer

Newer than 49% of homes nearby

How 21 Allway St ranks against every home in each area.
MeasureThis homeWestsideCharleston 29403Charleston County
Estimated valuepricier than$506,49014% of homes15% of homes38% of homes
Price per ft²pricier than$3737% of homes6% of homes55% of homes
Living areabigger than1,358 ft²37% of homes39% of homes33% of homes
Lot sizebigger than0.11 ac87% of homes69% of homes16% of homes
Year builtnewer than193566% of homes49% of homes5% of homes

About 21 Allway St

How much is 21 Allway St, Charleston, SC worth?

The TopHap Estimate for 21 Allway St, Charleston, SC is $506,490 as of Aug 30, 2026. The likely range is $423,205 to $589,775. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 21 Allway St, Charleston, SC?

21 Allway St, Charleston, SC has 3 bedrooms, 2 bathrooms, 1,358 square feet of living space and a 0.11-acre lot.

When was 21 Allway St, Charleston, SC built?

21 Allway St, Charleston, SC was built in 1935, making it 91 years old. It is a bungalow home. The building has 1 story.

What schools serve 21 Allway St, Charleston, SC?

21 Allway St, Charleston, SC is assigned to Burke High School (high), rated F; Simmons-Pinckney Middle School (middle), rated C-; Julian Mitchell Elementary School (elementary), rated D-. All sit in Charleston County School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Allway St, Charleston, SC compare to other homes in Charleston 29403?

Among the 6,405 homes in Charleston 29403, it is worth more than 15% of them ($506,490 against a typical $909,509), its price per square foot is higher than 6% of them ($373 against a typical $644), it is bigger than 39% of them (1,358 ft² against a typical 1,554 ft²), its lot is bigger than 69% of them (0.11 ac against a typical 0.1 ac) and it is newer than 49% of them (1935 against a typical 1938). Measured against all of Charleston County, it is worth more than 38% 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 Allway St, Charleston, SC?

The 2024 property tax bill for 21 Allway St, Charleston, SC was $1,801. The county assessed it at $5,610.

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