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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesA building project’s “green” claim is credible only to the extent that its scope, assessment, and performance evidence can be checked. Identify what was assessed, verify any certification against the relevant scheme, examine impacts beyond energy, and distinguish design predictions from results measured after the building is occupied. A certificate or score can be useful evidence within its stated boundaries; neither is a blanket guarantee of every environmental outcome.
Start by defining what “green” means for this project
Before judging a claim, identify the project and the claim’s boundaries. Record the building’s location, type and size or area where available, the phase it has reached, and the parts of the building included in the assessment. A new design, a building under construction, and an occupied building can provide different kinds of evidence; an unbuilt project cannot yet supply measured operating results.
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Then translate broad marketing language into a specific proposition. Is the project claiming a design target, a certification, lower energy use, low-carbon materials, improved occupant conditions, or several of these? For each statement, identify the relevant building boundary, systems or materials, baseline, period, and evidence. If the claim does not say what is included, ask for that information before treating it as a result.
- Project: Which building, site, use, and phase does the claim cover?
- Assessment: Which rating scheme, system, version, and certification level are being claimed?
- Performance: Is the figure a modeled estimate or measured consumption? What baseline and time period does it use?
- Impact: Does the claim concern operational energy, materials and construction, or another category such as water or ecology?
These details determine whether evidence can answer the question being asked. Two headline ratings or energy figures are not meaningfully comparable if one covers a different project boundary, phase, building use, or set of impacts.
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Verify the certification, not just the logo
Ask for the project certificate or an official project record, then check that it identifies the building and matches the claim. A logo on a brochure does not establish which scheme, version, project boundary, or result applies. Certification is evidence of assessment against a particular framework, not proof that every environmental impact is low.
For a BREEAM claim
BREEAM describes assessment against benchmarks across a building’s specification, design, construction, and use. Its categories include energy, water, transport, health and wellbeing, resources, resilience, land use and ecology, pollution, materials, waste, management, and innovation. Ask for the certificate, rating, applicable scheme, and project identity, and confirm them through the scheme’s project or certificate information. BREEAM’s process uses a licensed assessor, project registration, assessment, quality assurance, and certification; the assessor and assessment records help establish what was actually evaluated. See BREEAM’s official guidance, “How Does BREEAM Work?”
For a LEED claim
Confirm the project type, rating system, registration and version, certification level, and project listing. USGBC advises project teams to choose a rating system suited to the project and to meet that system’s requirements. Requirements depend on the rating system in effect when the project registered, so a current checklist should not automatically be applied retroactively to an older registration. For a new building or major renovation, check the relevant USGBC project guidance and its “LEED requirements and other guidance.”
Residential projects may have a distinct verification and performance-testing process. USGBC’s “Guide to Certification: Residential” describes that context; do not assume that verification for a residential project is identical to a new commercial building’s process. In every case, read the certification in its own scope: which criteria were assessed, what project boundary they covered, and what was outside the claim.
Separate design estimates from actual building performance
A predicted energy result and an occupied building’s energy use answer different questions. A model can indicate how the building’s design and systems are expected to perform under defined standard operating conditions. Meter or utility records show consumption under actual operating conditions, which are affected by how people use and manage the building as well as by its physical characteristics.
The U.S. Department of Energy (DOE) makes this distinction between its Building Energy Asset Score and ENERGY STAR Portfolio Manager: Asset Score reflects modeled energy use under standard operating conditions, while Portfolio Manager reflects actual operating energy use. DOE says the figures are not directly comparable and treats the tools as complementary. A comparison that places one figure beside the other as if they were equivalent can therefore mislead.
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For an existing or occupied building
Request utility bills or meter data for a stated period, and find out which meters and uses are included. Ask how the results account for weather, occupancy, building use, and operating hours. These factors matter when interpreting consumption or comparing it with a baseline: a change in occupancy or hours, for example, changes the conditions under which the building is being assessed. The available information should explain the normalization method rather than merely label a number “efficient.”
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Check whether the data represent the whole building or only selected systems, and whether on-site generation is included in the reported figure. The comparison framework should state its boundary and baseline clearly. DOE’s guidance on commercial building performance monitoring and evaluation emphasizes consistent definitions, collection procedures, and data quality; without those, a precise-looking number may not support a reliable comparison.
For a new project
Request the modeled-performance assumptions and compare the prediction with commissioning and post-occupancy evidence as these become available. A design-stage estimate is not a measurement of how the finished building performs. The useful question is whether the project has a plan to check the installed systems and then monitor actual operation, not simply whether a target appeared in the design documents.
Use commissioning records to check what was installed
Commissioning checks whether building systems work in line with design intent. DOE describes a process that can include design review, functional testing, documentation, and operator training. Ask for the commissioning scope and records rather than relying on a general statement that a project was “commissioned.”
- Scope and design review: Which systems were covered, and what design intent were they checked against?
- Functional testing: What tests were completed, and what do the results show about system operation?
- Deficiencies: Were issues identified? Request their status and the corrective actions recorded.
- Handover: What system documentation and operator training were provided?
- Follow-up: Is there a plan to monitor performance and address problems after occupancy?
DOE notes that commissioning can reveal faults that waste energy or harm comfort and indoor air quality. A completed test record is evidence about system checks at a particular stage; ongoing monitoring and follow-up help show whether the building continues to operate as intended. DOE’s “Commissioning in Federal Buildings” and “HVAC Commissioning” explain commissioning practices and examples.
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Look beyond operating energy to materials and embodied carbon
A low operational-energy claim does not account for all climate impacts. DOE defines embodied carbon as life-cycle greenhouse-gas emissions associated with the manufacturing, transport, installation, maintenance, and disposal of materials and products, excluding the use phase. It is therefore a separate part of the picture from emissions associated with operating the building.
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If a project makes a materials or embodied-carbon claim, ask for the reported lifecycle stages, included building elements and products, assumptions, and data sources. Find out whether reductions came from design changes, reuse, or lower-impact material choices, and what parts of the project those changes cover. If the project reports only operational energy, do not treat that as evidence that its materials and construction impacts have also been assessed.
DOE’s “Embodied Carbon Reduction in New Construction: Reference Guide” provides the relevant lifecycle framing. The project’s own method and boundary still need to be clear before its figure can be interpreted or compared with another building’s.
Check the rest of the project’s environmental and occupant claims
Energy is only one category in a whole-building assessment. Match each additional public claim to a relevant project document or measured indicator. BREEAM’s category list illustrates the range that may be considered: water, transport, health and wellbeing, resources, resilience, land use and ecology, pollution, materials, waste, management, and innovation, as well as energy.
Use the following questions to keep broad claims specific:
- Water: What water-related outcome is claimed, and what project evidence supports it?
- Transport: What part of the site or building’s transport impact is covered by the claim?
- Health and comfort: Is the claim based on a stated assessment or other project evidence, and what does that evidence cover?
- Ecology and land use: What site conditions or ecological outcomes were assessed?
- Resilience and pollution: What risks or pollution impacts are included in the project’s assessment?
- Waste and management: What records or indicators support claims about these areas?
These questions are prompts for obtaining project-specific evidence, not a claim that every project publishes the same metric. If evidence is unavailable, distinguish that gap from a demonstrated poor outcome: the project has not substantiated that particular claim with the material you were given.
Compare projects on like-for-like terms
There is no single directly comparable score established across every rating system and project type. A headline label is not enough to rank two buildings. State the comparison method and its limits, and line up the project boundaries and evidence before drawing a conclusion.
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| Comparison area | What to align or disclose |
|---|---|
| Scope | Building boundary, area, building use, project phase, and included systems. |
| Assessment | Scheme, rating-system version, certification level, verification method, and date. |
| Energy | Modeled asset performance or measured use; baseline and period; treatment of weather and occupancy; meter coverage; and whether on-site generation is included. |
| Materials and carbon | Lifecycle boundary, included materials or building elements, assumptions, data sources, and reporting method. |
| Delivery and operation | Commissioning scope and records, operator training, meter coverage, monitoring, and post-occupancy evidence. |
| Other impacts | Evidence for the particular water, transport, ecology, health and comfort, resilience, pollution, or waste claims being compared. |
If one project has a certification and another has measured energy data, those are not interchangeable forms of evidence. Describe each on its own terms and avoid turning unlike labels or metrics into a single ranking.
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A score is only as useful as its scope, definitions, and underlying data. DOE says useful building-performance metrics need consistent definitions, collection procedures, and data quality. Ask who supplied the inputs, what method produced the outputs, and whether the results were independently checked.
In particular, DOE says Asset Score inputs and outputs are not currently verified by the department. Treat an Asset Score as information about modeled energy performance, not as independent DOE validation of the data or result. That qualification does not make the tool useless; it makes the distinction between a model output and a verified project outcome essential. See DOE’s “Building Energy Asset Score Frequently Asked Questions.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical evidence review, from claim to conclusion
- Write down the claim. Quote or summarize exactly what the project says is green, and identify the building, location, use, and phase to which it refers.
- Set its boundary. Ask what area, systems, materials, lifecycle stages, baseline, and period are included. Record anything explicitly excluded.
- Verify any credential. Obtain the scheme, rating system and version, certificate or project listing, level, and project identity. Check that they match the public claim.
- Request the underlying evidence. For energy, determine whether the data are modeled or measured. For other categories, request the specific records or indicators that support the claim.
- Check delivery and operation. Review commissioning records, corrective actions, handover and training information, and post-occupancy monitoring where available.
- Test comparability. Before comparing buildings, align their scope, phase, use, metrics, periods, and methods; identify differences that remain.
- State the conclusion narrowly. Say what the documentation establishes, what it does not cover, and which claims remain unsupported by the evidence available.
This approach keeps a positive result meaningful without turning it into a broader promise than the documentation can support. For technical review, use an assessor or commissioning professional qualified for the project’s location and type; a framework-specific certification process may also require a scheme-licensed assessor.
Sources for the assessment concepts
- BREEAM, “How Does BREEAM Work?” and its official assessor and certification guidance.
- USGBC, “LEED certification for new buildings and major renovations,” “Guide to Certification: Residential,” and “LEED requirements and other guidance.”
- U.S. DOE, “Building Energy Asset Score Frequently Asked Questions.”
- U.S. DOE, “Commissioning in Federal Buildings” and “HVAC Commissioning.”
- U.S. DOE Building Technologies Office, “Embodied Carbon Reduction in New Construction: Reference Guide.”
- U.S. DOE, “Performance Metrics Tiers” and “Commercial Building Performance Monitoring and Evaluation.”
Frequently Asked Questions
Does a BREEAM or LEED certificate prove that a building is sustainable in every respect?
No. A certificate shows that a project was assessed against a defined framework, rating system, version, and project boundary. Review the certificate or official project record to confirm the building identity, rating, and scope. Then check which categories the assessment covered and which claims fall outside it. Certification is useful evidence, but it does not independently establish every possible environmental benefit or guarantee strong performance in every impact area.
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Check the project’s rating system and registration information, including the applicable version and certification level. USGBC guidance says requirements are tied to the rating system in effect at registration. A checklist for a newer version therefore should not automatically be used to judge an older project. Confirm that the project type matches the selected rating system and that the official listing or records correspond to the building being discussed.
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Can I compare a DOE Asset Score directly with ENERGY STAR Portfolio Manager data?
Not as equivalent numbers. DOE describes Asset Score as modeled energy use under standard operating conditions and Portfolio Manager as actual energy use under operating conditions. The tools answer different questions and are complementary, not directly comparable. For a fair assessment, label each result as modeled or measured, state its boundary and period, and explain operating conditions and assumptions.
What should I ask for after a building has been commissioned?
Ask which systems were covered, what design intent was reviewed, which functional tests were completed, and what deficiencies were found. Request the corrective-action status, system documentation, operator training records, and any follow-up monitoring plan. Commissioning can identify faults that waste energy or harm comfort and indoor air quality, but test records document checks at a particular stage; they do not by themselves prove that the building will continue to operate as intended.
What does an embodied-carbon claim need to disclose?
It should identify the lifecycle stages and building elements or products included, along with its assumptions and data sources. DOE’s definition covers emissions associated with manufacturing, transport, installation, maintenance, and disposal of materials and products, excluding the use phase. Ask whether reported reductions reflect design changes, reuse, or lower-impact material choices, and do not confuse the result with operational-energy emissions.
What if a project cannot provide evidence for a water, ecology, or health claim?
Treat that claim as unsubstantiated by the evidence provided, rather than assuming either that the outcome is good or that it is poor. Ask for the relevant project document, assessment, or measured indicator and note its boundary. Whole-building assessments can cover a range of categories, but projects may not publish the same metrics or supporting records.
Who can help review a project’s technical evidence?
A qualified assessor or commissioning professional can help interpret evidence for the project’s location and type. For a BREEAM certification claim, the official process includes a licensed assessor, registration, assessment, quality assurance, and certification. Confirm that the professional’s qualifications and role fit the specific review; a general score or marketing consultant’s statement is not the same as independent confirmation of every project outcome.
The Bottom Line
Judge a green building claim by matching it to verifiable evidence: confirm the project and certification scope, distinguish modeled energy from measured use, review commissioning and materials data, and check the impacts the claim actually covers. State what the documentation supports—and what it does not—rather than treating a certificate or score as a universal guarantee.
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