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Single Family ResidenceResidential
$1,358,437$512 / 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 Jul 14, 2026

18 ROCK LN

WALTHAM, MA 02451
2.5
Baths
2,654 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
2015
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$1.4M
$1.2M low$1.5M high
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.$129,877
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$103,902
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.93%
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.$754,375
NEEDHAM COOPERATIVE BANK · 3% · recorded Apr 15, 2016
2nd 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.$474,185
NEEDHAM BANK

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,364 (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.$1,259,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$405,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$854,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,206,500

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.75 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.0.23
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 With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
Thomas R Plympton Elementary SchoolC
Elementary · Grades KG–5 · 0.3 mi
H
Waltham Sr High SchoolC
High · Grades 9–12 · 0.8 mi
M
John F. Kennedy Middle SchoolA-
Middle · Grades 6–8 · 0.8 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.Yes

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

18 Rock Ln 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 97% of homes in Waltham 02451
  • Costs more per square foot than 76% of homes in Piety Corner
  • Bigger than 82% of homes in Piety Corner
  • Has a bigger lot than 65% of homes in Waltham 02451
  • Newer than 97% of 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 97% 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$1,358,437
CheaperTypical $780,267Pricier

Pricier than 97% of homes nearby

Price per ft²$512
CheaperTypical $467Pricier

Pricier than 67% of homes nearby

Living area2,654 ft²
SmallerTypical 1,778 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.23 ac
SmallerTypical 0.18 acBigger

Bigger than 65% of homes nearby

Year built2015
OlderTypical 1957Newer

Newer than 97% of homes nearby

How 18 Rock Ln ranks against every home in each area.
MeasureThis homePiety CornerWaltham 02451Middlesex County
Estimated valuepricier than$1,358,43796% of homes97% of homes85% of homes
Price per ft²pricier than$51276% of homes67% of homes61% of homes
Living areabigger than2,654 ft²82% of homes82% of homes78% of homes
Lot sizebigger than0.23 ac49% of homes65% of homes40% of homes
Year builtnewer than201597% of homes97% of homes96% of homes

About 18 Rock Ln

How much is 18 Rock Ln, Waltham, MA worth?

The TopHap Estimate for 18 Rock Ln, Waltham, MA is $1,358,437 as of Jul 14, 2026. The likely range is $1,216,403 to $1,500,471. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Rock Ln, Waltham, MA last sell?

18 Rock Ln, Waltham, MA last sold on Sep 28, 2018, according to the county's recorded deed.

How big is 18 Rock Ln, Waltham, MA?

18 Rock Ln, Waltham, MA has 2.5 bathrooms, 2,654 square feet of living space and a 0.23-acre lot.

When was 18 Rock Ln, Waltham, MA built?

18 Rock Ln, Waltham, MA was built in 2015, making it 11 years old. It is a colonial home. The building has 2 stories.

What schools serve 18 Rock Ln, Waltham, MA?

18 Rock Ln, Waltham, MA is assigned to Thomas R Plympton Elementary School (elementary), rated C; Waltham Sr High School (high), rated C; John F. Kennedy Middle School (middle), rated A-. All sit in Waltham School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Rock Ln, Waltham, MA compare to other homes in Waltham 02451?

Among the 4,967 homes in Waltham 02451, it is worth more than 97% of them ($1,358,437 against a typical $780,267), its price per square foot is higher than 67% of them ($512 against a typical $467), it is bigger than 82% of them (2,654 ft² against a typical 1,778 ft²), its lot is bigger than 65% of them (0.23 ac against a typical 0.18 ac) and it is newer than 97% of them (2015 against a typical 1957). Measured against all of Middlesex County, it is worth more than 85% 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 18 Rock Ln, Waltham, MA?

The 2025 property tax bill for 18 Rock Ln, Waltham, MA was $12,364. The county assessed it at $1,259,100.

More homes on Rock Ln

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Assigned schools

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