Building Carbon Emissions Reporting Deadline Extended

Boston pushes BERDO reporting deadline back three months

Boston building owners now have until August 15, 2026 to submit their emissions data under the city’s Building Emissions Reduction and Disclosure Ordinance. The extension moves the deadline from May 15 and applies to all covered properties reporting 2025 calendar year data. The BERDO Review Board made the change after receiving feedback from property owners during the first year of enforceable emissions standards.

This marks a significant shift for Boston’s building sector. Properties that previously only tracked energy use must now stay within carbon limits or face daily penalties. The extension provides additional time, but the underlying requirements remain unchanged.

Buildings covered by BERDO represent approximately 70% of Boston’s greenhouse gas emissions. Consequently, the ordinance sits at the centre of the city’s commitment to reach net zero by 2050. For property owners, this means navigating new compliance obligations while managing operational costs and potential retrofit investments.

How BERDO evolved from voluntary tracking to binding limits

Boston introduced BERDO in 2013 as a disclosure requirement. Initially, the ordinance required large building owners to report annual energy and water consumption through the EPA’s ENERGY STAR Portfolio Manager system. Residential properties with 15 or more units and non-residential buildings exceeding 20,000 square feet fell within scope. However, no performance standards existed at that stage.

The landscape changed dramatically in October 2021. Boston City Council voted unanimously to approve BERDO 2.0, which Acting Mayor Kim Janey signed into law on October 5, 2021. This update transformed the ordinance from a reporting exercise into enforceable performance standards with carbon intensity limits that tighten annually.

Boston became one of the first US cities to impose binding carbon limits on existing buildings through this legislation. The approach differs from new construction standards because it requires owners of existing properties to reduce emissions progressively. Building owners cannot simply maintain current practices and remain compliant.

The compliance process involves three main steps. First, owners submit energy data through ENERGY STAR Portfolio Manager. Second, they complete a BERDO Reporting Form specific to Boston’s requirements. Third, they arrange for third-party verification of their submissions. This verification is mandatory in the first reporting year, the first compliance year, and every five years thereafter. Boston publishes aggregated data annually, creating public transparency around building performance across the city.

Which buildings must comply and when

Current reporting requirements cover residential buildings with 15 or more units and non-residential buildings larger than 20,000 square feet. Nevertheless, the emissions standards phase in based on building size. Properties of 35 units or 35,000 square feet and above entered compliance in 2025. Smaller buildings within the original reporting threshold will face emissions limits from 2030 onwards.

The August 15, 2026 deadline applies to all covered properties reporting their 2025 data. This represents the first full year under emissions enforcement. Building owners must submit complete information for the previous calendar year, including verified energy consumption, water use, and calculated carbon emissions.

Each building receives an emissions intensity target measured in kilograms of carbon dioxide equivalent per square foot annually. These targets decrease progressively, creating a glide path toward net zero by 2050. A building that meets its 2025 target will face a lower threshold in 2026, and so on through subsequent years.

Owners have some flexibility through Renewable Energy Certificates. Buildings that exceed their emissions limits can purchase RECs to offset the difference and achieve compliance. For the 2025 compliance year, REC purchases must be completed by March 1, 2026. This provides a compliance pathway while owners plan and implement physical building improvements.

Penalties escalate quickly for non-compliance

BERDO includes financial penalties for various types of non-compliance. Late or incomplete reporting triggers fines between £150 and £300 per day after a 30-day cure period. Larger buildings face the higher end of this range at £300 daily. These penalties accumulate until the owner submits complete and accurate data.

Inaccurate reporting carries steeper consequences. Building owners who submit false or misleading information face fines between £1,000 and £5,000 per day. This reflects the city’s emphasis on data integrity within the system. Verification requirements exist partly to prevent inadvertent errors that could trigger these penalties.

Emissions non-compliance generates ongoing daily fines ranging from £300 to £1,000 until the building either reduces its emissions below the limit or purchases sufficient RECs to cover the gap. A property that remains out of compliance throughout a full year could accumulate over £100,000 in penalties at the upper end of the scale.

These financial consequences make compliance a priority for most building owners. The costs of penalties can quickly exceed the investment required for energy efficiency improvements or renewable energy purchases. Moreover, the public disclosure element means non-compliant buildings become visible in city data, potentially affecting property values and tenant attraction.

Boston offers free technical support for reporting

The city recognised that many building owners lack experience with the ENERGY STAR Portfolio Manager system or emissions calculations. Therefore, Boston provides free technical assistance to help property owners navigate the reporting requirements. This support covers data entry, form completion, and understanding verification procedures.

Technical assistance aims to reduce compliance barriers, particularly for smaller property owners who may not employ dedicated facilities managers. The service helps owners gather necessary utility data, input information correctly, and troubleshoot common issues that arise during submission.

Building owners can access this support through Boston’s Environment Department. The department established dedicated resources as the first emissions compliance year approached. This reflects a pragmatic recognition that successful policy implementation requires both clear requirements and practical support mechanisms.

The August extension itself emerged from dialogue between the BERDO Review Board and building owners. Many owners reported needing additional time to arrange verification services and finalise their submissions during this first compliance cycle. The three-month extension responds directly to that feedback while maintaining the overall policy framework.

Five critical facts about BERDO compliance

• All buildings with 15 or more residential units or 20,000 square feet of non-residential space must report energy and water data annually, with emissions standards phasing in based on building size starting from 2025.
• The reporting deadline for 2025 calendar year data has moved from May 15 to August 15, 2026, giving building owners three additional months to prepare their submissions and arrange verification.
• Third-party verification is required in the first reporting year, first compliance year, and every five years thereafter, adding a quality assurance layer to the data collection process.
• Buildings exceeding their emissions limits can purchase Renewable Energy Certificates by March 1 each year to achieve compliance while planning longer-term physical improvements.
• Daily penalties for non-compliance range from £150 for late reporting to £5,000 for inaccurate data, creating significant financial pressure to meet requirements correctly and on time.

Parallel changes through Article 37 affect new construction

Boston amended its zoning code through Article 37 with new green building standards that took effect on July 1, 2025. These rules apply to new construction and major renovations rather than existing buildings. Projects involving 20,000 square feet or more of non-residential space, or 15 or more residential units, must now achieve net-zero operational carbon.

Article 37 also introduces embodied carbon reporting requirements for larger projects. This covers emissions generated during material production, transportation, and construction itself. Cambridge implemented similar embodied emissions rules in 2023, and Newton has followed suit. Massachusetts is developing a statewide approach to building decarbonisation that aligns with Boston’s trajectory.

These parallel requirements create a comprehensive framework addressing both existing buildings through BERDO and new construction through Article 37. Together, they reshape the carbon profile of Boston’s entire building stock over time. Developers and property owners increasingly operate within a regulatory environment where carbon performance directly affects project feasibility and operating costs.

What building owners should consider now

The August deadline provides breathing room but not unlimited time. Building owners should begin gathering utility data for 2025 immediately if they have not already done so. Complete records for electricity, gas, water, and any other energy sources used during the calendar year are essential. Missing data complicates submission and can trigger penalties.

Arranging third-party verification requires advance planning. Qualified verifiers review submitted data for accuracy and completeness before owners can finalise their BERDO submissions. During this first compliance year, demand for verification services is likely high. Early engagement with verification providers helps avoid last-minute scheduling difficulties.

Building owners should calculate their preliminary emissions intensity against their assigned targets as soon as possible. This reveals whether the building met its 2025 limit or whether REC purchases will be necessary for compliance. Remember that the REC purchase deadline of March 1, 2026 falls well before the August 15 reporting deadline. Owners cannot wait until August to address emissions gaps.

Properties that significantly exceed their limits face a choice between paying ongoing penalties and investing in building improvements. Energy efficiency upgrades, heating system electrification, and renewable energy installation all reduce future emissions. These investments avoid penalties in subsequent years when targets tighten further. ESG compliance services can help evaluate which measures deliver the best return in your specific circumstances.

Small to mid-size building owners should take advantage of the free technical assistance Boston offers. The support exists specifically to help navigate ENERGY STAR Portfolio Manager and the BERDO submission process. Using this resource reduces the risk of errors that could trigger penalties or require resubmission.

Looking beyond 2026, building owners need medium-term strategies for progressive emissions reduction. Annual targets will continue tightening through 2050. A compliance approach based purely on REC purchases becomes increasingly expensive as the gap between actual emissions and targets widens. Physical building improvements provide more sustainable compliance pathways over time.

Properties entering the real estate market face additional considerations. BERDO compliance status and emissions performance now affect property valuations and buyer due diligence. Non-compliant buildings or those with high emissions intensity relative to targets may face valuation discounts. Sellers benefit from demonstrating strong compliance records and, where possible, implementing improvements before listing.

Where to find official guidance and resources

Boston’s Environment Department maintains the primary source of BERDO information, including detailed guidance documents, reporting forms, and compliance deadlines. The city’s official environment and energy page provides access to these resources and contact information for technical support.

The EPA’s ENERGY STAR Portfolio Manager serves as the platform for data submission. The EPA offers training materials and webinars on using Portfolio Manager effectively. Building owners new to the system should review these materials before beginning data entry.

Massachusetts has published its own roadmap for achieving net zero emissions by 2050, which provides broader context for Boston’s building requirements. The state’s climate policy page outlines complementary initiatives and statewide goals that intersect with local regulations.

Building owners working across multiple jurisdictions should monitor developments in Cambridge, Newton, and other Massachusetts municipalities implementing similar requirements. Regional consistency in reporting approaches and verification standards may emerge over time, potentially simplifying compliance for multi-property portfolios.