Third-party verification means an independent, qualified professional checks your ENERGY STAR Portfolio Manager data before you submit your annual benchmarking report. More cities and states now require it on a fixed schedule, from every three years in Chicago to every five years in Boston and Maryland. This guide explains what verifiers check, who can sign off, and which jurisdictions require verification in 2026 and 2027.
Most energy benchmarking laws let owners self-report their building data every year. Verification adds a second set of eyes: a credentialed professional who is independent from the owner reviews the building’s property details and 12 months of utility data, confirms they match source documents, and signs a verification form that is submitted with the report.
Programs use different names for the same idea. Chicago and Washington, DC call it data verification, Boston and Maryland call it third-party verification, and Seattle calls it benchmarking verification. Whatever the name, it is not an energy audit: the verifier checks that the reported data is accurate, not how the equipment performs.
Benchmarking data now does more than produce a public score. In cities with building performance standards, the same numbers set your baseline, your target and any penalty, so a small error can move a building from compliant to non-compliant. Verifiers most often catch:
These are the main US programs with a verification requirement, based on each program’s 2026 rules:
| Jurisdiction | How often | Next verification |
|---|---|---|
| Boston BERDO 2.020,000+ sq ft or 15+ units | Every 5 years | 2026 was a verification year; most buildings verify again in 2031 |
| Cambridge BEUDONon-residential | Baseline years and the first year of each compliance period | May 1, 2027 for properties of 100,000+ sq ft |
| Chicago50,000+ sq ft | Every 3 years | Your March notification letter says if 2027 is your year |
| Chula Vista BESOCovered buildings | 2027 reporting cycle | May 20, 2027 for 2026 data |
| Energize Denver25,000+ sq ft | Before the interim target, then after the final target year | First round was due June 1, 2026; next after your final target year |
| Detroit25,000+ sq ft | First deadline, then every third deadline | 2027 for 100,000+ sq ft; 2028 for 25,000–100,000 sq ft |
| Evanston20,000+ sq ft | Once, to set a verified baseline | Before 2030 if not verified since 2023 |
| Maryland BEPS35,000+ sq ft | Every 5 years | First round in 2026; next in 2031 |
| Montgomery County, MDCovered buildings | Every 3 years | Check whether 2027 is your building’s year |
| Newton BERDOCovered buildings | Second reporting year, then every 5 years | September 15, 2027 for most buildings |
| Seattle BEPS20,000+ sq ft | Before the first target, then every 5 years | October 1, 2027 for buildings over 90,000 sq ft; smaller buildings from 2028 to 2030 |
| Washington, DC10,000+ sq ft | Periodic verification cycles | May 3, 2027 filing (2026 data) |
New York City is a common question: Local Law 84 does not require third-party verification of benchmarking data, although Local Law 97 emissions reports must be certified by a registered design professional. Schedules can change, so always confirm the year in your city’s notice.
Each program sets its own rules, but most accept a licensed Professional Engineer (PE), a licensed architect or a Certified Energy Manager (CEM), and some accept other energy credentials. The key test is independence.
Washington, DC is a good example. Verifiers must hold one of the accepted credentials, such as PE, licensed architect, CEM or Building Energy Assessment Professional (BEAP). They also cannot be the owner, an owner’s employee, or the person who entered the building’s data in Portfolio Manager, as explained in DC’s data verification guide.
A typical verification follows these steps, similar to the checklist in Chicago’s benchmarking guidance materials:
A clean verification starts months before the deadline:
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No. Verification checks that your reported benchmarking data is accurate. An energy audit looks at building systems to find savings. Some cities require both, on different schedules.
Usually not. Most programs require the verifier to be independent from the owner, and some, like Washington, DC, also exclude the person who entered the data.
Your report can be treated as incomplete, which means the same fines as a missed report may apply. Check your city’s rules for exact penalties.
In Washington, DC, verification can be done by the EPA as part of ENERGY STAR certification. Other cities have their own rules, so check before relying on certification.
For a well-organized building, the review itself often takes a few days. Gathering utility data and floor area records usually takes longer, so start early.
For city-by-city deadlines, see our guides for Boston BERDO, Chicago, Washington, DC and Seattle, read our guide to energy audit compliance by city, or browse the full energy benchmarking compliance guide.
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