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Single Family ResidenceResidential
$2,461,708$855 / 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 86How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $2,425,000 on Jul 28, 2026

9 WILLIAM ST

MOUNT PLEASANT, SC 29464
4
Beds
4.5
Baths
2,880 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
2008
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$2.5M
$2.1M low$2.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$2,425,000 · Jul 28, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,078 (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.$1,374,250 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$649,750
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$724,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$47,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,267,400

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.85 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.99%

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
CountyCHARLESTON
Lot (acres)The size of the land the home sits on, from county records.0.18
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Heat Pump
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 · 561 ft²

Transaction History(5)

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
Mount Pleasant Academy
Elementary · Grades PK–5 · 0.2 mi
M
Moultrie Middle SchoolA+
Middle · Grades 6–8 · 1.0 mi
H
Lucy Garrett Beckham High SchoolA
High · Grades 9–12 · 3.5 mi

District: Charleston County School District

Neighborhood · ZIP 29464These 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.69
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 100.344

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.42%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.0%
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.54,918
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,518 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,069
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,355
Average tempThe average temperature here across a full year.66°F
Annual precipHow much rain and melted snow falls here in a typical year.49 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

9 William 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 more than 94% of homes in Charleston County
  • Costs more per square foot than 91% of homes in Charleston County
  • Bigger than 86% of homes in Charleston County
  • Has a smaller lot than 72% of homes in Mount Pleasant 29464
  • Newer than 89% of homes in Mount Pleasant 29464

What homes are worth in Mount Pleasant 29464

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

This home
$341K$3.9M

This home is worth more than 92% of homes in Mount Pleasant 29464.

How it measures up in Mount Pleasant 29464

The dot is this home. The mark in the middle is the typical home in Mount Pleasant 29464.

Estimated value$2,461,708
CheaperTypical $975,000Pricier

Pricier than 92% of homes nearby

Price per ft²$855
CheaperTypical $472Pricier

Pricier than 88% of homes nearby

Living area2,880 ft²
SmallerTypical 1,928 ft²Bigger

Bigger than 81% of homes nearby

Lot size0.18 ac
SmallerTypical 0.25 acBigger

Bigger than 28% of homes nearby

Year built2008
OlderTypical 1988Newer

Newer than 89% of homes nearby

How 9 William St ranks against every home in each area.
MeasureThis homeMount Pleasant 29464Charleston County
Estimated valuepricier than$2,461,70892% of homes94% of homes
Price per ft²pricier than$85588% of homes91% of homes
Living areabigger than2,880 ft²81% of homes86% of homes
Lot sizebigger than0.18 ac28% of homes34% of homes
Year builtnewer than200889% of homes82% of homes

About 9 William St

How much is 9 William St, Mount Pleasant, SC worth?

The TopHap Estimate for 9 William St, Mount Pleasant, SC is $2,461,708 as of Sep 24, 2026. The likely range is $2,116,897 to $2,806,519. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9 William St, Mount Pleasant, SC last sell?

9 William St, Mount Pleasant, SC last sold on Jul 28, 2026 for $2,425,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 9 William St, Mount Pleasant, SC?

9 William St, Mount Pleasant, SC has 4 bedrooms, 4.5 bathrooms, 2,880 square feet of living space and a 0.18-acre lot.

When was 9 William St, Mount Pleasant, SC built?

9 William St, Mount Pleasant, SC was built in 2008, making it 18 years old. The building has 2 stories.

What schools serve 9 William St, Mount Pleasant, SC?

9 William St, Mount Pleasant, SC is assigned to Mount Pleasant Academy (elementary); Moultrie Middle School (middle), rated A+; Lucy Garrett Beckham High School (high), rated A. All sit in Charleston County School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9 William St, Mount Pleasant, SC compare to other homes in Mount Pleasant 29464?

Among the 19,180 homes in Mount Pleasant 29464, it is worth more than 92% of them ($2,461,708 against a typical $975,000), its price per square foot is higher than 88% of them ($855 against a typical $472), it is bigger than 81% of them (2,880 ft² against a typical 1,928 ft²), its lot is bigger than 28% of them (0.18 ac against a typical 0.25 ac) and it is newer than 89% of them (2008 against a typical 1988). Measured against all of Charleston County, it is worth more than 94% 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 9 William St, Mount Pleasant, SC?

The 2025 property tax bill for 9 William St, Mount Pleasant, SC was $5,078. The county assessed it at $1,374,250.

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