Boston Building Emissions Reduction and Disclosure Ordinance (BERDO 2.0)

Who's covered

BERDO 2.0 uses two entirely separate coverage tests, one for non-residential buildings and one for residential buildings, and they don't work the same way.

Non-Residential Buildings are covered at 20,000 sq ft or more of gross floor area (GFA), provided at least 50% of that area (excluding parking) is used for commercial, retail, office, professional, educational, or other non-residential purposes. This also sweeps in a parcel with a single owner and multiple buildings whose GFA cumulatively clears 20,000 sq ft under the same majority-use test -- each building on that parcel then has to comply individually unless the owner has an approved Building Portfolio (see below).

Residential Buildings are a genuinely different test, and this is the detail that catches owners out: square footage is not the trigger. A single residential building is covered once it has 15 or more individual dwelling units that, together with common space serving residents, make up more than 50% of the building's GFA (excluding parking) -- full stop. There is no square-footage alternative for a single building. A 14-unit building spanning 40,000 sq ft is not covered by this test; a 15-unit building spanning 12,000 sq ft is.

The one place square footage re-enters the residential picture is multi-building parcels under a single owner: there, a parcel is covered if its buildings cumulatively have either 15 or more total units, or cumulatively reach 20,000 sq ft of GFA -- whichever comes first. That's a portfolio-level backstop, not a substitute for the single-building unit-count test above.

A large tier exists within both coverage tests, and it matters for two things: which reporting fine applies, and when a building's emissions standard obligations actually start (see Key dates and Penalties). A building is in the large tier if it's a non-residential building 35,000 sq ft or larger (or 2+ buildings on a parcel totaling 100,000 sq ft or more), or a residential building with 35 or more units or 35,000 sq ft or more. Below that -- 20,000-34,999 sq ft non-residential, or 15-34 units/20,000-34,999 sq ft residential -- is the base tier, with a lighter reporting fine and a later emissions-standard start date.

City-owned buildings ("City Buildings") are covered under a parallel set of disclosure rules, not the private-owner rules described here.

Key dates

May 15, standing annual deadline, codified directly in the ordinance: reports are due to the Air Pollution Control Commission (via ENERGY STAR Portfolio Manager and the BERDO portal) no later than May 15 of each year for the prior calendar year. The 2026 reporting cycle was administratively extended to August 15, 2026 -- confirm the current-year deadline with the city rather than assuming May 15 applies unmodified every year, since the city has moved this date before.

Every covered building already went through a phased first-report onboarding between 2014 and 2022 depending on its size and type -- the largest buildings (non-residential 50,000+ sq ft, residential 50+ units/50,000+ sq ft) started as far back as September 2014, and the last cohort (the base-tier 20,000-34,999 sq ft / 15-34 unit buildings) had its first report due May 15, 2022. If your building is covered at all today, this onboarding schedule is behind you -- you're simply on the annual May 15 cycle now, unless you're in a genuinely new building that wasn't yet built during the original phase-in.

Third-party data verification runs on its own cycle, and it's a five-year look-back, not a single-year spot-check. Owners self-certify their data every year. In a building's first year of reporting after BERDO 2.0's 2021 enactment, that year's data needed third-party verification. After that, Verification Years are 2026 and every five years thereafter (2031, 2036, ...) -- and in a Verification Year, an owner has to provide third-party verification covering the five calendar years prior to (not including) the current year, all at once.

The unit-count trigger, explained

Because this is the single most common point of confusion with BERDO, it's worth stating plainly one more time: for a standalone residential building, the number of dwelling units decides coverage -- not the building's square footage. A large single-family-style building with fewer than 15 units owes nothing under BERDO no matter how big it is; a compact building that clears 15 units is covered no matter how small its footprint is.

Trigger	Coverage rule	Large tier (earlier emissions start, higher fine)
Non-residential (single building)	≥ 20,000 sq ft GFA, 50%+ non-residential use	≥ 35,000 sq ft
Non-residential (multi-building parcel)	Cumulative GFA ≥ 20,000 sq ft	Cumulative GFA ≥ 100,000 sq ft
Residential (single building)	≥ 15 dwelling units, 50%+ of GFA	≥ 35 units or ≥ 35,000 sq ft
Residential (multi-building parcel)	Cumulative ≥ 15 units or ≥ 20,000 sq ft	≥ 50 units or ≥ 50,000 sq ft

Penalties

Reporting-violation fines are assessed per day the building stays out of compliance, and scale by tier:

• $300/day -- large-tier non-residential (≥35,000 sq ft, or 2+ buildings on a parcel totaling 100,000+ sq ft) and large-tier residential (≥35 units or ≥35,000 sq ft).
• $150/day -- base-tier non-residential (20,000-34,999 sq ft) and base-tier residential (15-34 units or 20,000-34,999 sq ft).

No penalty is assessed until 30 days after a notice of violation, and none at all if the owner corrects the violation within that 30-day window -- a real cure period, not just a grace period on paper.

Failing the emissions standard itself (once your building's obligation starts -- see below) is penalized separately and more steeply: $1,000/day for large-tier buildings, $300/day for base-tier buildings, for every day of the calendar year the violation isn't corrected. A building that never reported the data needed to calculate its emissions compliance is treated as non-compliant with the emissions standard outright, and owes these same fines until it reports.

A discrepancy between third-party-verified data and an owner's self-certified reporting draws its own fine, $1,000-$5,000, at the Review Board's discretion, based partly on whether the inaccuracy affected a compliance determination. An owner can petition to have this reduced, including in cases where the third-party verification in question was filed by a prior owner of the building.

Owners facing an emissions-standard gap aren't limited to paying a penalty outright. Boston recognizes an Alternative Compliance Payment (ACP) of $234 per metric ton of CO2e, reviewed every 5 years by the Review Board, plus Renewable Energy Certificates, Power Purchase Agreements, and Boston's own municipal electricity aggregation program as ways to offset a building's calculated emissions before any penalty math applies. Buildings with real hardship factors -- historic designation, affordable-housing refinancing timelines, pre-existing long-term energy contracts, or financial hardship -- can apply for a Hardship Compliance Plan with an alternative timeline or alternative standard, and any building can apply for an Individual Compliance Schedule (a custom declining-emissions path, as long as it cuts emissions at least 50% by 2030 and 100% by 2050).

All ACPs and penalties collected flow into Boston's Equitable Emissions Investment Fund, which funds local building carbon-abatement projects prioritizing environmental justice populations -- worth knowing since it shapes how the Review Board evaluates hardship and hearing requests, not just where the money technically goes.

Step-by-step: how to comply

1. Confirm which test actually applies to your building -- the 20,000 sq ft non-residential test, or the 15-unit residential test -- and whether it falls in the large tier or base tier. We check both tests against your building's details and flag which one governs, since owners who assume "square footage" applies across the board get this wrong for residential buildings.
2. Enter energy and water data in ENERGY STAR Portfolio Manager with a "Boston" Standard ID, then submit through both ESPM and the BERDO portal -- watch for the current-year deadline, since it isn't guaranteed to be the standing May 15 date every year. We handle this dual submission and flag the confirmed current-year deadline rather than assuming May 15.
3. Track your building's Verification Year (2026, 2031, 2036, ...) and arrange third-party verification covering the five prior calendar years when it arrives. We track this cycle for you, but the verification itself has to come from a qualified energy professional, the same as any licensed sign-off elsewhere in this registry.
4. If your building is subject to the emissions standard, monitor its trajectory against Table 1's declining caps for its building use category, and evaluate an Alternative Compliance Payment, RECs, or a Hardship Compliance Plan well before a shortfall becomes a per-day fine. We track your building's projected position against its cap and flag it early -- but deciding how to close a gap (capital investment, ACP, or a hardship application) is a real business decision that has to be yours.
5. If a hardship factor genuinely applies -- historic designation, affordable-housing refinancing, a pre-existing long-term energy contract, or financial hardship -- apply for a Hardship Compliance Plan or Individual Compliance Schedule before a violation accrues, not after. We can flag when your situation looks like it might qualify, but the application to the Review Board is yours to file.

What we handle

BERDO's two-track coverage test is the single biggest source of owner confusion in this registry, and getting it wrong in either direction is costly -- either you think a 15-unit building is exempt because it's "only" 12,000 sq ft, or you think a 40,000 sq ft, 12-unit building is covered when it isn't. Run the compliance checker below to confirm which test actually applies to your building, then join the waitlist. What stays yours: engaging a qualified energy professional for your Verification Year, and the underlying decisions -- capital investment vs. Alternative Compliance Payment vs. a hardship application -- behind closing any emissions-standard gap.

Frequently asked questions

My residential building is 40,000 sq ft but only has 12 units. Is it covered?

No, as a standalone building. BERDO's residential test for a single building is unit count (15 or more), not square footage -- there's no square-footage alternative for a single building the way there is for non-residential buildings. A 12-unit building isn't covered regardless of size, unless it's part of a multi-building parcel under one owner that cumulatively clears 15 units or 20,000 sq ft.

Is the BERDO deadline always May 15?

The ordinance codifies May 15 as the standing annual deadline, but the city has moved it before -- the 2026 cycle was extended to August 15, 2026. Confirm the current year's actual deadline rather than assuming May 15 by default.

What does "large tier" actually mean, and why does it matter?

It's the ≥35,000 sq ft non-residential / ≥35 units-or-35,000 sq ft residential threshold. It matters because it decides two things independently: your reporting-violation fine ($300/day vs. $150/day) and, more significantly, when your building's emissions standard obligations start -- 2025 for large-tier buildings, 2030 for base-tier buildings.

How often does BERDO data actually need third-party verification?

Every five years, but not as a single-year check -- 2026, 2031, 2036, and so on are "Verification Years," and in each one you provide third-party verification covering the five calendar years immediately before it, all at once. The very first year a building reports after BERDO 2.0's 2021 enactment also required its own one-time verification.

Can I pay my way out of a BERDO emissions-standard shortfall?

Not indefinitely as a strategy, but yes as a real, sanctioned mechanism: the Alternative Compliance Payment is $234 per metric ton of CO2e (reviewed every 5 years), and it's one of several recognized ways -- alongside RECs, Power Purchase Agreements, and municipal aggregation electricity -- to offset calculated emissions before penalty math applies.

What if my reported data doesn't match what my third-party verification finds?

That discrepancy is its own violation, carrying a fine between $1,000 and $5,000 at the Review Board's discretion -- separate from (and potentially in addition to) any emissions-standard penalty if the inaccurate data had made the building look compliant when it wasn't.

Is there any relief if my building genuinely can't hit its emissions target on schedule?

Yes, several real paths: a Hardship Compliance Plan for buildings with a qualifying hardship (historic designation, affordable-housing refinancing timing, a pre-existing long-term energy contract, or financial hardship), or an Individual Compliance Schedule with a custom declining path, as long as it still reaches 50% below baseline by 2030 and 100% (net zero) by 2050. Neither is automatic -- both require an application to, and approval from, the Review Board.