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Data-Driven Methodology

How Scoring Works

🏛️ Boston Edition

A multi-factor analysis of building quality using 13 weighted dimensions and official City of Boston records. No building scores 100—max is 99.5.

375K+violations (RentSmart)
13dimensions
99.5max score

The Algorithm

Weighted composite scoring

Final Score =
Σ(Categoryi × Weighti)
÷
Σ Weights
Adjusted for building age, size, and violation severity
3.5×
Safety
Highest priority
3.0×
Maintenance
Building upkeep
2.5×
Track Record
Historical patterns
2.0-2.25×
Heat/Pest/Response
Health & safety

Core Principles

Time Decay

5yr
decay window

Old resolved issues fade over time. A violation fixed 5+ years ago has minimal impact. Open violations always count at full weight.

Open vs Closed

open weight

Open violations are 5x more impactful than closed ones. A building that fixes issues quickly scores better.

Per-Unit Normalization

÷
units

10 violations in a 100-unit building is better than 10 in a 5-unit building. Large buildings are judged fairly.

Max Score: 99.5

99.5
maximum

No building scores a perfect 100. Unreported issues and uncertainty always exist in any building.

Violation Caps

60
cap at 100+ viols

Buildings with many violations have capped maximum scores. 50+ violations caps at 70, 100+ caps at 60.

Age Consideration

125+
years of history

Older buildings (pre-1900) are judged with context—Boston has many well-maintained historic buildings.

Boston-Specific Factors

What makes Boston scoring unique

Brutal Winter Focus

Boston winters average 48" of snow. Heat violations are weighted heavily (2.25×) because a building that fails to provide adequate heat in January is a serious life safety concern. Heat required Oct 1 - May 31, minimum 68°F daytime.

Student Capital of America

Boston has MORE college students per capita than any US city. Buildings near BU, BC, NEU, Harvard, MIT score lower on stability. Sept 1 is Boston's massive moving day—"Allston Christmas."

MBTA Transit (1897)

America's oldest subway system. We track proximity to Red, Orange, Blue, and Green lines. Buildings near T stations score higher— car ownership is expensive and parking is scarce in Boston.

Urban Pest Context

Boston has proactive rodent control programs tracked via 311. We analyze both building violations AND neighborhood-level pest complaints to give a complete picture.

Climate & Flood Risk

Boston faces significant sea level rise risk. East Boston, Seaport, and Charlestown are especially vulnerable. Buildings with flood complaints get major penalties.

Historic Character

Boston founded 1630. Historic districts (Beacon Hill, Back Bay, South End, North End) have character but also renovation restrictions. We flag both the bonus and the complexity.

Note on Rent Control: Massachusetts banned rent control statewide in 1994. Unlike NYC, Boston buildings don't have rent-stabilized units. However, Boston has strong tenant protections including security deposit laws and lease renewal rights.

Grade Thresholds

A
90-99.5
B
80-89
C
70-79
D
60-69
F
0-59

Most Boston buildings score 80+. Problem buildings can score as low as 20-30.

13 Scoring Dimensions

Tap any category to see details

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Enter any Boston address to get a comprehensive building report with all 13 scoring dimensions.

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Last updated: 2026-01-09Data sourcesHow scoring worksRenter checklist