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Duplex (2 Units, Any Combination)Residential
$323,877$268 / 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 97How 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 $203,750 on Jan 26, 2009

503 TREMONT ST

HISTORIC NEW CASTLE, DE 19720
3
Beds
1
Baths
1,208 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.
2,614 ft²
Lot SizeThe size of the land the home sits on, from county records.
1948
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$324K
$314K low$334K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$203,750 · Jan 26, 2009

Tax & Assessment

Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$271,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$56,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$214,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$36,300

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
14
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
6
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
73
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
79
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.1 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountyNEW CASTLE
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1979
Lot (acres)The size of the land the home sits on, from county records.0.06
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Carrie Downie Elementary SchoolD-
Elementary · Grades KG–5 · 0.6 mi
H
William Penn High SchoolD
High · Grades 9–12 · 1.1 mi
M
Calvin R. McCullough Middle SchoolF
Middle · Grades 6–8 · 2.6 mi

District: Colonial School District

Neighborhood · ZIP 19720These 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.92
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 100.72

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.15%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.10%
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.62,421
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,200 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$75,145
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$95,209
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.44 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.70%

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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

503 Tremont 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 65% of homes in New Castle County
  • Costs more per square foot than 87% of homes in New Castle 19720
  • Smaller than 81% of homes in New Castle County
  • Has a smaller lot than 89% of homes in New Castle 19720
  • Older than 84% of homes in New Castle 19720

What homes are worth in New Castle 19720

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

This home
$141K$635K

This home is worth more than 60% of homes in New Castle 19720.

How it measures up in New Castle 19720

The dot is this home. The mark in the middle is the typical home in New Castle 19720.

Estimated value$323,877
CheaperTypical $294,716Pricier

Pricier than 60% of homes nearby

Price per ft²$268
CheaperTypical $210Pricier

Pricier than 87% of homes nearby

Living area1,208 ft²
SmallerTypical 1,400 ft²Bigger

Bigger than 35% of homes nearby

Lot size2,614 ft²
SmallerTypical 0.16 acBigger

Bigger than 11% of homes nearby

Year built1948
OlderTypical 1965Newer

Newer than 16% of homes nearby

How 503 Tremont St ranks against every home in each area.
MeasureThis homeNew Castle 19720New Castle County
Estimated valuepricier than$323,87760% of homes35% of homes
Price per ft²pricier than$26887% of homes83% of homes
Living areabigger than1,208 ft²35% of homes19% of homes
Lot sizebigger than2,614 ft²11% of homes18% of homes
Year builtnewer than194816% of homes19% of homes

About 503 Tremont St

How much is 503 Tremont St, Historic New Castle, DE worth?

The TopHap Estimate for 503 Tremont St, Historic New Castle, DE is $323,877 as of Sep 24, 2026. The likely range is $313,740 to $334,014. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 503 Tremont St, Historic New Castle, DE last sell?

503 Tremont St, Historic New Castle, DE last sold on Jan 26, 2009 for $203,750, according to the county's recorded deed.

How big is 503 Tremont St, Historic New Castle, DE?

503 Tremont St, Historic New Castle, DE has 3 bedrooms, 1 bathrooms, 1,208 square feet of living space and a 0.06-acre lot.

When was 503 Tremont St, Historic New Castle, DE built?

503 Tremont St, Historic New Castle, DE was built in 1948, making it 78 years old. It is a duplex single home. The building has 2 stories.

What schools serve 503 Tremont St, Historic New Castle, DE?

503 Tremont St, Historic New Castle, DE is assigned to Carrie Downie Elementary School (elementary), rated D-; William Penn High School (high), rated D; Calvin R. McCullough Middle School (middle), rated F. All sit in Colonial School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 503 Tremont St, Historic New Castle, DE compare to other homes in New Castle 19720?

Among the 18,847 homes in New Castle 19720, it is worth more than 60% of them ($323,877 against a typical $294,716), its price per square foot is higher than 87% of them ($268 against a typical $210), it is bigger than 35% of them (1,208 ft² against a typical 1,400 ft²), its lot is bigger than 11% of them (2,614 ft² against a typical 0.16 ac) and it is newer than 16% of them (1948 against a typical 1965). Measured against all of New Castle County, it is worth more than 35% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

More homes on Tremont St

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Assigned schools

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