225 Windsor Street
K-12 School in Cambridge, MA
At a glance
225 Windsor Street is a 83,221-square-foot K-12 school in Cambridge, Massachusetts, built in 1982. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 91 out of 100 (grade A), a site energy-use intensity of 42.0 kBtu/ft² and 181 tCO₂e of greenhouse-gas emissions. That score is higher than 84% of the 38 scored K-12 school buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 91 (band A) |
| Site EUI | 42.0 kBtu/ft² |
| Source EUI | 58.9 kBtu/ft² |
| GHG emissions | 181 tCO₂e |
| GHG intensity | — |
| Electricity | 208,963 kWh |
| Natural gas | 24,312 therms |
| Water use | 761 kgal |
| Gross floor area | 83,221 sq ft |
| Source record | cambridge:B1057:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 91 | +1 | 42.0 kBtu/ft² | 181 tCO₂e |
| 2023 | 90 | +6 | 41.6 kBtu/ft² | 181 tCO₂e |
| 2022 | 84 | +4 | 49.3 kBtu/ft² | 223 tCO₂e |
| 2021 | 80 | -2 | 53.5 kBtu/ft² | 236 tCO₂e |
| 2020 | 82 | -8 | 49.3 kBtu/ft² | 215 tCO₂e |
| 2019 | 90 | +11 | 50.8 kBtu/ft² | 217 tCO₂e |
| 2018 | 79 | -2 | 53.1 kBtu/ft² | 255 tCO₂e |
| 2017 | 81 | +4 | 48.5 kBtu/ft² | 241 tCO₂e |
| 2016 | 77 | +14 | 49.5 kBtu/ft² | 288 tCO₂e |
| 2015 | 63 | 69.0 kBtu/ft² | 429 tCO₂e |
Compliance context
BEUDO
Cambridge's 2023 BEUDO amendments require non-residential buildings of 100,000+ sq ft to reach net-zero emissions by 2035 (reductions starting 2026) and those of 25,000–100,000 sq ft by 2050 (starting 2030).
Ownership
CAMBRIDGE CITY OF
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Location
- Address
- 225 Windsor Street
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36680, -71.09590
Within ~1 km
Nearby benchmarked buildings
- 250 Massachusetts Avenuescore —
Laboratory · 1,362,662 sq ft
- 250 Massachusetts Avenuescore —
Laboratory · 517,029 sq ft
- 145 Broadwayscore 91
Office · 490,000 sq ft
- 303 Binney Stscore —
Laboratory · 480,000 sq ft
- 32 VASSAR STscore —
College/University · 464,005 sq ft
- 555 Technology Squarescore —
Laboratory · 457,000 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 225 Windsor Street compare with other K-12 school buildings in Cambridge?
The latest disclosures cover 45 K-12 school buildings in Cambridge, out of 902 buildings citywide. 225 Windsor Street's ENERGY STAR score of 91 compares with an average of 60 across the 38 that report a score; it scores higher than 84% of them and lower than 13%. Its site EUI of 42.0 kBtu/ft² is about 33% below the average of 62.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 83,221 sq ft, it is about 35% above the average floor area of 61,739 sq ft for those buildings. It was built in 1982, 26 years later than the group's average year built (1956). Across all 24 jurisdictions BuildingCensus covers, the 6,548 K-12 school buildings average an ENERGY STAR score of 64 and a site EUI of 52.7 kBtu/ft².
How has 225 Windsor Street's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 225 Windsor Street, covering report years 2015–2024. Its ENERGY STAR score went from 63 in 2015 to 91 in 2024 (+28 points). Site EUI moved from 69.0 kBtu/ft² (2015) to 42.0 kBtu/ft² (2024), a 39% decrease. Reported emissions went from 429 tCO₂e to 181 tCO₂e over the same span (down 58%).
What does an ENERGY STAR score of 91 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 91 means the building performs better than about 91% of its national peers. BuildingCensus bands the score into report-card grades; 91 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In Cambridge, 50% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. 225 Windsor Street's 42.0 kBtu/ft² across 83,221 sq ft works out to about 3.5 billion Btu (1,024 MWh-equivalent) in 2024. Its source EUI of 58.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 208,963 kWh of electricity, 24,312 therms of natural gas and 761 thousand gallons of water for the year.
Which law requires 225 Windsor Street to report its energy use?
225 Windsor Street reports under BEUDO, the legal basis of Cambridge's Building Energy Use Disclosure Ordinance (BEUDO), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record cambridge:B1057:2024). Cambridge's 2023 BEUDO amendments require non-residential buildings of 100,000+ sq ft to reach net-zero emissions by 2035 (reductions starting 2026) and those of 25,000–100,000 sq ft by 2050 (starting 2030).
More K-12 school buildings in Cambridge
- 44 Linnaean Street· 78,732 sq ft · score 84 (B)
- 40 Granite Street· 74,806 sq ft · score 25 (D)
- 359 Broadway· 74,621 sq ft · score 87 (A)
- 85 Oxford Street· 69,340 sq ft · score 62 (C)
- 245 BENT ST, 247R BENT ST, 255 BENT ST· 60,000 sq ft
- 15 Upton Street· 58,529 sq ft · score 70 (B)
- K-12 School buildings in Cambridge· 45 benchmarked
- All Cambridge benchmarked buildings· BEUDO
- Most efficient large buildings in Cambridge
- Least efficient large buildings in Cambridge
- Biggest emitters in Cambridge
Frequently asked questions
What is 225 Windsor Street's energy grade?
225 Windsor Street scores 91 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Cambridge disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 225 Windsor Street use?
Its 2024 site energy-use intensity was 42.0 kBtu/ft² (58.9 kBtu/ft² source) across 83,221 sq ft, including 208,963 kWh of electricity and 24,312 therms of natural gas.
What are 225 Windsor Street's carbon emissions?
225 Windsor Street reported 181 tCO₂e of greenhouse-gas emissions for 2024.
Where is 225 Windsor Street?
225 Windsor Street is in Cambridge, Massachusetts. Its coordinates are 42.36680, -71.09590 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 225 Windsor Street and when was it built?
225 Windsor Street has 83,221 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1982 as its year built. It is classed as K-12 school.
Is 225 Windsor Street covered by BEUDO?
Yes — it appears in the 2024 Building Energy Use Disclosure Ordinance (BEUDO) disclosure, which lists the buildings reporting under BEUDO.
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About this data
Source: Building Energy Use Disclosure Ordinance (BEUDO) (BEUDO), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “225 Windsor Street, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/225-windsor-street-74acaa46 (data as of October 2, 2026).