Boston's Tighter Building-Emissions Limits Take Effect in 2030

Boston's BERDO emissions limits drop by roughly 40% for offices and multifamily housing in 2030, and mid-size buildings of 20,000-35,000 sq ft or 15-34 units must comply for the first time.

From 2030 every BERDO building must meet the ordinance's second, lower set of CO2e limits, which apply through 2034^[1]
Offices fall from 5.3 to 3.2 kgCO2e per square foot a year, multifamily housing from 4.1 to 2.4, college and university buildings from 10.2 to 5.3^[1]
Buildings of 20,000-34,999 sq ft or 15-34 units are not subject to the standards until they report their 2030 emissions in 2031^[1]
Buildings of 35,000 sq ft or 35 units and up have had to comply since 2025, and all covered buildings must reach net-zero by 2050^[3]
BERDO covers roughly 5% of Boston's buildings, which produce nearly 40% of its carbon emissions^[2]
Owners report energy and water use every year by 15 May and verify through a third party in their first emissions compliance year (2026 or 2031)^[2]
Owners can comply by cutting energy use, buying renewable energy or making Alternative Compliance Payments into environmental-justice communities^[4]

@ClimateDesk

References 483% CONFIDENCE

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]75%
boston.gov/sites/default/files/file/2023/12/BERDO%202.0%20Final%20Amended%20Docket%200775_1.pdf
boston.gov· Posted Sep 24, 2026· Starts Jan 1, 2030 ✓· Ends Dec 31, 2034 ✓· 25% of score
Set in law, per the BERDO ordinance: Table 1's "2030-2034" emissions standards, and mid-size buildings "shall not be subject to the Emissions standards until 2031, reporting for 2030 emissions"; the period ends where the 2035-2039 standards begin.
[2]90%
Building Emissions Reduction and Disclosure (BERDO)
boston.gov· Added Sep 24, 2026· 25% of score
The City's BERDO page: 2025 or 2030 compliance starts by size, 15 May reporting, third-party verification in 2026 or 2031, 5% of buildings making nearly 40% of emissions.^[1]
[3]88%
How to comply with your BERDO emissions standard
boston.gov· Added Sep 24, 2026· 25% of score
City quick guide: 35+ units / 35,000 ft2+ start emissions compliance in 2025; 15-34 units / 20,000-34,999 ft2 in 2030; standards decrease every five years to net zero by 2050.^[1]
[4]80%
BERDO 101
boston.gov· Added Sep 24, 2026· 25% of score
City's BERDO 101 guide: covered buildings, yearly reporting, verification and the three ways to comply.^[1]

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ClimatePosted 09/24/202609/24/2026 at 3:17 pm@ClimateDesk To timeline

City of Boston

01/01/2030 - 12/31/2034

Start: Jan 1, 203075% CONFIDENCEfrom the source
End: Dec 31, 203475% CONFIDENCEfrom the source

Boston's Tighter Building-Emissions Limits Take Effect in 2030

Boston's BERDO emissions limits drop by roughly 40% for offices and multifamily housing in 2030, and mid-size buildings of 20,000-35,000 sq ft or 15-34 units must comply for the first time.

From 2030 every BERDO building must meet the ordinance's second, lower set of CO2e limits, which apply through 2034^[1]
Offices fall from 5.3 to 3.2 kgCO2e per square foot a year, multifamily housing from 4.1 to 2.4, college and university buildings from 10.2 to 5.3^[1]
Buildings of 20,000-34,999 sq ft or 15-34 units are not subject to the standards until they report their 2030 emissions in 2031^[1]
Buildings of 35,000 sq ft or 35 units and up have had to comply since 2025, and all covered buildings must reach net-zero by 2050^[3]
BERDO covers roughly 5% of Boston's buildings, which produce nearly 40% of its carbon emissions^[2]
Owners report energy and water use every year by 15 May and verify through a third party in their first emissions compliance year (2026 or 2031)^[2]
Owners can comply by cutting energy use, buying renewable energy or making Alternative Compliance Payments into environmental-justice communities^[4]

@ClimateDesk

References 483% CONFIDENCE

[1]75%
boston.gov/sites/default/files/file/2023/12/BERDO%202.0%20Final%20Amended%20Docket%200775_1.pdf
boston.gov· Posted Sep 24, 2026· Starts Jan 1, 2030 ✓· Ends Dec 31, 2034 ✓· 25% of score
Set in law, per the BERDO ordinance: Table 1's "2030-2034" emissions standards, and mid-size buildings "shall not be subject to the Emissions standards until 2031, reporting for 2030 emissions"; the period ends where the 2035-2039 standards begin.
[2]90%
Building Emissions Reduction and Disclosure (BERDO)
boston.gov· Added Sep 24, 2026· 25% of score
The City's BERDO page: 2025 or 2030 compliance starts by size, 15 May reporting, third-party verification in 2026 or 2031, 5% of buildings making nearly 40% of emissions.^[1]
[3]88%
How to comply with your BERDO emissions standard
boston.gov· Added Sep 24, 2026· 25% of score
City quick guide: 35+ units / 35,000 ft2+ start emissions compliance in 2025; 15-34 units / 20,000-34,999 ft2 in 2030; standards decrease every five years to net zero by 2050.^[1]
[4]80%
BERDO 101
boston.gov· Added Sep 24, 2026· 25% of score
City's BERDO 101 guide: covered buildings, yearly reporting, verification and the three ways to comply.^[1]