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Single Family ResidenceResidential
$1,166,733$375 / 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 Jul 14, 2026
Last sold for $890,000 on Jan 27, 2021

30 ROSEMONT AVE

WALTHAM, MA 02451
4
Beds
4 / 1
Baths
3,113 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.
3,829 ft²
Lot SizeThe size of the land the home sits on, from county records.
2020
Year BuiltThe year the home was originally built, according to county records.
3
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.2M
$1.1M low$1.2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$890,000 · Jan 27, 2021
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$499,233
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$399,386
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.54%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$667,500
GUARANTEED RATE INC · P · recorded Jan 27, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,625 (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.$980,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$326,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$653,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$954,300

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.37
1
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.
59
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
89
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
32
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
StyleThe architectural style of the home, such as ranch or colonial.Colonial
CountyMiddlesex
Lot (acres)The size of the land the home sits on, from county records.0.09
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
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.

M
John F. Kennedy Middle SchoolA-
Middle · Grades 6–8 · 0.5 mi
E
Douglas MacArthur Elementary SchoolA
Elementary · Grades KG–5 · 0.5 mi
H
Waltham Sr High SchoolC
High · Grades 9–12 · 0.7 mi

District: Waltham School District

Neighborhood · ZIP 02451These 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.84
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.7%
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.16,966
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,036 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,384
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,140
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

30 Rosemont Ave 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 93% of homes in Piety Corner
  • Costs less per square foot than 84% of homes in Waltham 02451
  • Bigger than 91% of homes in Piety Corner
  • Has a smaller lot than 92% of homes in Middlesex County
  • Among the newest homes in Piety Corner

What homes are worth in Waltham 02451

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

This home
$324K$1.5M

This home is worth more than 92% of homes in Waltham 02451.

How it measures up in Waltham 02451

The dot is this home. The mark in the middle is the typical home in Waltham 02451.

Estimated value$1,166,733
CheaperTypical $780,267Pricier

Pricier than 92% of homes nearby

Price per ft²$375
CheaperTypical $467Pricier

Pricier than 16% of homes nearby

Living area3,113 ft²
SmallerTypical 1,778 ft²Bigger

Bigger than 89% of homes nearby

Lot size3,829 ft²
SmallerTypical 0.18 acBigger

Bigger than 13% of homes nearby

Year built2020
OlderTypical 1957Newer

Newer than almost all homes nearby

How 30 Rosemont Ave ranks against every home in each area.
MeasureThis homePiety CornerWaltham 02451Middlesex County
Estimated valuepricier than$1,166,73393% of homes92% of homes79% of homes
Price per ft²pricier than$37518% of homes16% of homes25% of homes
Living areabigger than3,113 ft²91% of homes89% of homes87% of homes
Lot sizebigger than3,829 ft²13% of homes13% of homes8% of homes
Year builtnewer than2020almost all homesalmost all homesalmost all homes

About 30 Rosemont Ave

How much is 30 Rosemont Ave, Waltham, MA worth?

The TopHap Estimate for 30 Rosemont Ave, Waltham, MA is $1,166,733 as of Jul 14, 2026. The likely range is $1,113,458 to $1,220,008. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 30 Rosemont Ave, Waltham, MA last sell?

30 Rosemont Ave, Waltham, MA last sold on Jan 27, 2021 for $890,000, according to the county's recorded deed.

How big is 30 Rosemont Ave, Waltham, MA?

30 Rosemont Ave, Waltham, MA has 4 bedrooms, 4 bathrooms, 3,113 square feet of living space and a 0.09-acre lot.

When was 30 Rosemont Ave, Waltham, MA built?

30 Rosemont Ave, Waltham, MA was built in 2020, making it 6 years old. It is a colonial home. The building has 3 stories.

What schools serve 30 Rosemont Ave, Waltham, MA?

30 Rosemont Ave, Waltham, MA is assigned to John F. Kennedy Middle School (middle), rated A-; Douglas MacArthur Elementary School (elementary), rated A; Waltham Sr High School (high), rated C. All sit in Waltham School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 30 Rosemont Ave, Waltham, MA compare to other homes in Waltham 02451?

Among the 4,967 homes in Waltham 02451, it is worth more than 92% of them ($1,166,733 against a typical $780,267), its price per square foot is higher than 16% of them ($375 against a typical $467), it is bigger than 89% of them (3,113 ft² against a typical 1,778 ft²), its lot is bigger than 13% of them (3,829 ft² against a typical 0.18 ac) and it is newer than almost all of them (2020 against a typical 1957). Measured against all of Middlesex County, it is worth more than 79% 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 30 Rosemont Ave, Waltham, MA?

The 2025 property tax bill for 30 Rosemont Ave, Waltham, MA was $9,625. The county assessed it at $980,100.

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Assigned schools

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